阅读说明：本技术 包含硅酮聚碳酸酯弹性体的运动装备 (Sports equipment comprising silicone polycarbonate elastomer ) 是由 罗伯特·罗素·加卢奇 丹尼尔·弗朗西斯·洛厄里 于 2018-05-16 设计创作，主要内容包括：一种运动装备制品,包含热塑性聚(碳酸酯-硅氧烷)弹性体。(An article of sports equipment comprising a thermoplastic poly (carbonate-siloxane) elastomer.)

1. An article of sports equipment comprising a thermoplastic poly (carbonate-siloxane) elastomer.

2. The article of claim 1, wherein the article is a ball.

3. The article of claim 2, wherein the article is a golf ball.

4. The article of claim 1, wherein the article is a handle, grip strap, stick, wand, fishing rod, hockey puck, surfboard, ski, racquet, diving board, lie-down surfboard, ski pole, ski sign, ski, skate shoe, ski boot, ski goggles, athletic glove, or snowshoe.

5. The article of claim 1, wherein the article is a rigid sports article having a hollow interior portion at least partially filled with the thermoplastic poly (carbonate-siloxane) elastomer.

6. The article of claim 5, wherein the article is a tennis racket frame or handle; golf club handles, heads or shafts; a hockey stick; a fishing rod; a stay bar; baseball, softball, or cricket bats; a mallet; skis; a surfboard; or a ski.

7. The article of claim 1, wherein the article is a shoe or any component of a shoe.

8. The article of claim 1 or claim 7, wherein the article comprises a sole of a sports shoe.

9. The article of any one of claims 1 to 8, wherein the thermoplastic poly (carbonate-siloxane) elastomer provides impact or vibration management.

10. The article of claim 1 or claim 9, wherein the article is an article of safety equipment, preferably a helmet, chest protector, shin protector, cup, knee bolster or shoulder bolster.

11. The article of any one or more of claims 1 to 10, wherein the thermoplastic poly (carbonate-siloxane) elastomer is in the form of a foam or layer.

12. The article of any one or more of claims 1 to 11, wherein the poly (carbonate-siloxane) elastomer comprises 50 to 90 weight percent siloxane blocks, and the siloxane blocks comprise an average of 10 to 80 units.

13. The article of claim 12, comprising 60 to 80 weight percent siloxane blocks, and the siloxane blocks comprise an average of 10 to 50 units.

14. The article of any one or more of claims 1 to 13, wherein the poly (carbonate-siloxane) elastomer comprises blocks of carbonate units derived from bisphenol a and blocks of dimethylsiloxane units.

15. The article of any one or more of claims 1 to 14, wherein the poly (carbonate-siloxane) elastomer comprises siloxane blocks having a glass transition temperature of-130 ℃ to-50 ℃, and polycarbonate blocks having a glass transition temperature greater than 70 ℃.

16. The article of any one or more of claims 1 to 15, wherein the poly (carbonate-siloxane) elastomer has a weight average molecular weight of 10,000 daltons to 100,000 daltons.

17. The article of any one or more of claims 1 to 16, wherein the poly (carbonate-siloxane) elastomer has a pre-yield elongation of at least 30% as measured by ASTM D638, and a shore D hardness of 5 to 20 as measured by ASTM D2240.

18. The article of any one or more of claims 1 to 17, wherein the poly (carbonate-siloxane) elastomer further comprises 0.1 wt% to 50 wt% of a metal oxide or a mixture thereof.

19. The article of claim 18, wherein the metal oxide comprises titanium dioxide having an average particle size of 0.05 microns to 5.0 microns, and the metal oxide is encased in a silica, alumina, or silica alumina shell that has been passivated with a silicone compound.

20. The article of any one or more of claims 1 to 19, wherein the poly (carbonate-siloxane) elastomer further comprises 0.01 wt% to 3.0 wt% of a phosphorous-containing stabilizer.

Background

The present disclosure relates to improved sporting equipment, for example, sport balls such as soccer balls and golf balls, and athletic shoes.

Some sporting equipment (such as rackets, bats, and sports balls such as soccer, football, softball, squash, tennis, handball, cricket, lacrosse, and golf balls, as well as volleyball and basketball shoes) have elastomeric components. While there are a variety of elastomers that can be used in equipment, there is a continuing need in the art for elastomers having specific properties. It would be particularly useful if the performance could be tailored to each sport as desired.

Disclosure of Invention

Disclosed herein is an article of athletic equipment comprising a poly (carbonate-siloxane) elastomer.

The invention is further illustrated by the following disclosure, examples and claims.

Detailed Description

The present inventors have discovered that thermoplastic poly (carbonate-siloxane) elastomers, particularly poly (carbonate-siloxane) elastomer resins having a silicone content of at least 50 weight percent (wt%), can be used to make athletic equipment for a variety of activities. Poly (carbonate-siloxane) elastomers exhibit an advantageous combination of elastomeric behavior and good mechanical properties, such as flexibility. The low glass transition of poly (carbonate-siloxane) elastomers allows elastomer recovery to be maintained over a wide temperature range, even well below freezing point. Furthermore, poly (carbonate-siloxane) elastomers have a surprisingly non-slip, high traction surface, combined with their high recoverable elasticity, making them well-suited for shoe applications. The properties can be further tailored to meet the requirements of a particular article or sport.

The elastic nature of the resin and its high elastic recovery make it useful for any article involved in energy transfer, particularly sports articles for hitting a ball or other projectile, such as golf, baseball, tennis, handball, squash, racquetball, badminton, hockey, and the like. The same resin characteristics make poly (carbonate-siloxane) elastomers useful in other articles, for example, safety equipment designed to manage energy absorption, such as helmets, shoulder pads, knee pads, and the like. Poly (carbonate-siloxane) elastomers may also be used in shoes and their components, such as athletic shoes, boots, shoe soles, and the like. In some embodiments, the poly (carbonate-siloxane) elastomer comprises only a portion of the athletic article. The elastomer may be present in the article as a solid, film or foam.

Elastomers are particularly useful in fasteners, balls, or equipment for energy transfer from a sports article to the environment, such as equipment for striking a ball or other projectile. Such articles particularly benefit from elastic recovery of the poly (carbonate-siloxane) elastomer. In another advantageous feature, the low glass transition temperature (Tg) of the poly (carbonate-siloxane) elastomers makes them particularly suitable for use in equipment for cold weather sports, such as skiing, ice fishing, ice skating, hockey, and other winter sports as described below.

The thermoplastic nature of the poly (carbonate-siloxane) elastomer allows for rapid molding of articles that are not chemically cured. This allows the molding of articles with short cycle times and no emissions. The elastomeric resin may be remelted for further molding and customization, and may be recycled for reuse. In addition to high elastic recovery, poly (carbonate-siloxane) elastomers have a very "skid-resistant" low slip surface, making them useful for handles, gloves, shoes, grips, belts, and packaging, particularly for shoes.

The poly (carbonate-siloxane) elastomer comprises carbonate blocks and siloxane blocks. The carbonate blocks comprise repeating structural carbonate units of the formula (1)

Wherein R is¹At least 60% of the total number of radicals being aromatic, or each R¹Containing at least one C_6-30An aromatic group. Specifically, each R¹May be derived from a dihydroxy compound such as an aromatic dihydroxy compound of formula (2) or a bisphenol of formula (3).

In the formula (2), the reaction mixture is,each R^hIndependently of a halogen atom such as bromine, C_1-10Hydrocarbyl radicals such as C_1-10Alkyl, halogen substituted C_1-10Alkyl radical, C_6-10Aryl or halogen substituted C_6-10Aryl, and n is 0 to 4.

In the formula (3), R^aAnd R^bEach independently is halogen, C_1-12Alkoxy or C_1-12And p and q are each independently an integer of 0 to 4, such that when p or q is less than 4, the valence of each carbon of the ring is filled with hydrogen. In one embodiment, p and q are each 0, or p and q are each 1, and R is^aAnd R^bEach being C meta to the hydroxy group on each arylene group_1-3Alkyl, in particular methyl. X^aIs a bridging group connecting two hydroxy-substituted aromatic groups, wherein each C is₆The bridging group and the hydroxy substituent of the arylene group being in C₆Arylene groups ortho, meta or para (in particular para) to one another, e.g. single bonds, -O-, -S-, -S (O) -, -S (O)₂-, -C (O) -or C_1-18An organic group, which may be cyclic or acyclic, aromatic or non-aromatic, and may further comprise heteroatoms such as halogens, oxygen, nitrogen, sulfur, silicon, or phosphorus. For example, X^aC which may be substituted or unsubstituted_3-18A cycloalkylidene group; formula-C (R)^c)(R^d) C of (A)_1-25Alkylidene-wherein R^cAnd R^dEach independently is hydrogen, C_1-12Alkyl radical, C_1-12Cycloalkyl radical, C_7-12Arylalkyl radical, C_1-12Heteroalkyl or cyclic C_7-12A heteroarylalkyl group; or formula-C (═ R)^e) A group of (a) wherein R^eIs divalent C_1-12A hydrocarbyl group. Exemplary bisphenols include: 2, 2-bis (4-hydroxyphenyl) propane (hereinafter referred to as "bisphenol-A" or "BPA"), tetrabromobisphenol A, 2-bis (3, 5-dimethyl-4-hydroxyphenyl) propane, 4' -dihydroxydiphenyl ether, resorcinol, hydroquinone, t-butylhydroquinone, 1-bis (4-hydroxyphenyl) methane, 1-bis (4-hydroxyphenyl) ethane, 2-bis (4-hydroxyphenyl) butane, 2-bis (4-hydroxyphenyl) octane, 1-bis (4-hydroxyphenyl) propane, 1-bis (4-hydroxyphenyl) -n-butane, 2-bis (4-Hydroxy-1-methylphenyl) propane, 1-bis (4-hydroxy-tert-butylphenyl) propane and cyclohexyl BPA. Combinations comprising at least one of the foregoing dihydroxy compounds may also be used. The poly (carbonate-siloxane) elastomer may be a linear or branched copolymer, for example, using branched elastomer resins of trimellitic acid, trimellitic anhydride, trimellitic trichloride, tris-p-hydroxyphenyl ethane (THPE), isatin-bisphenol, trisphenol TC (1,3, 5-tris ((p-hydroxyphenyl) isopropyl) benzene), trisphenol PA (4(4(1, 1-bis (p-hydroxyphenyl) ethyl) α, α -dimethylbenzyl) phenol), 4-chloroformyl phthalic anhydride, trimesic acid and benzophenone tetracarboxylic acid.

Some illustrative examples of dihydroxy compounds that may be used are described in, for example, WO2013/175448A1, US2014/0295363, and WO 2014/072923. In a specific embodiment, the polycarbonate units are derived from bisphenol-A. In another embodiment, the polycarbonate units are derived from resorcinol and bisphenol-a, and the molar ratio of resorcinol carbonate units to bisphenol-a carbonate units is from 1:99 to 99: 1.

The siloxane block comprises diorganosiloxane units of the formula (4)

Wherein each R is independently C_1-13A monovalent organic group; and E has an average value of 5 to 50. For example, R may be C_1-13Alkyl radical, C_1-13Alkoxy radical, C_2-13Alkenyl radical, C_2-13Alkenyloxy radical, C_3-6Cycloalkyl radical, C_3-6Cycloalkoxy, C_6-14Aryl radical, C_6-10Aryloxy radical, C_7-13Arylalkylene or C_7-13An alkylarylene group. The foregoing groups may be fully or partially halogenated with fluorine, chlorine, bromine, or iodine, or a combination comprising at least one of the foregoing halogens. In one embodiment, wherein the transparent polysiloxane-polycarbonate is, R is not substituted with halogen. Combinations of the foregoing R groups can be used in the same elastomer. The symbol "Dn" is used herein to denote the average number of diorganosiloxane units; for example, D45 means a silicone blockWith an average value of E of 45.

In one embodiment, the polydiorganosiloxane blocks have the formula (5) or (6)

Wherein E is as defined in formula (4) and each R may be the same or different and is as defined in formula (4). In formula (5), Ar may be the same or different and is substituted or unsubstituted C_6-30Arylene, wherein a bond is directly to an aromatic moiety. The Ar group in formula (15) may be derived from C_6-30A dihydroxyarylene compound, for example, a dihydroxyarylene compound of the above formula (2) or (3), such as 1, 1-bis (4-hydroxyphenyl) methane, 1-bis (4-hydroxyphenyl) ethane, 2-bis (4-hydroxyphenyl) propane, 2-bis (4-hydroxyphenyl) butane, 2-bis (4-hydroxyphenyl) octane, 1-bis (4-hydroxyphenyl) propane, 1-bis (4-hydroxyphenyl) n-butane, 2-bis (4-hydroxy-1-methylphenyl) propane, 1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxyphenyl sulfide), tetrabromobisphenol A, and 1, 1-bis (4-hydroxy-t-butylphenyl) propane. Combinations comprising at least one of the foregoing dihydroxy compounds may also be used. In formula (6), each R⁵Independently is divalent C_1-30Organic radicals, especially C_7-30Alkylene arylene wherein the alkylene is attached to the silicone and the arylene. In a specific embodiment, the polydiorganosiloxane blocks have the formula (7)

Wherein R and E are as defined in formula (4), R6 is a divalent C2-C8 aliphatic radical, each M may independently be the same or different, and may be halogen, cyano, nitro, C_1-8Alkylthio radical, C_1-8Alkyl radical, C_1-8Alkoxy radical, C_2-8Alkenyl radical, C_2-8Alkenyloxy radical, C_3-8Cycloalkyl radical, C_3-8Cycloalkoxy, C_6-10Aryl radical, C_6-10Aryloxy radical, C_7-12ArylaryleneAlkyl or C_7-12An alkylarylene group, and each n is independently the same or different and is 0, 1, 2, 3, or 4. In one embodiment, M is bromo or chloro, an alkyl group such as methyl, ethyl or propyl, an alkoxy group such as methoxy, ethoxy or propoxy, or an aryl group such as phenyl, chlorophenyl or tolyl; r⁶Is a dimethylene, trimethylene or tetramethylene group; and R is C_1-8Alkyl, haloalkyl such as trifluoropropyl, cyanoalkyl, or aryl such as phenyl, chlorophenyl or tolyl. In another embodiment, R is methyl, or a combination of methyl and trifluoropropyl, or a combination of methyl and phenyl. In another embodiment, R is methyl, M is methoxy, n is 1, R is₆Is divalent C₁-C₃An aliphatic group. Specific polydiorganosiloxane blocks have the formula

Or a combination comprising at least one of the foregoing, wherein E has an average value of 5 to 80, or 5 to 70, or 5 to 60; or 10 to 80, or 20 to 80; or 20 to 70, or 30 to 60. In one embodiment, E has an average value of 10 to 60.

In one embodiment, the poly (carbonate-siloxane) elastomer is prepared by reacting at least one dihydroxy-terminated polydiorganosiloxane corresponding to formula (5), (6) or (7) having 5 to 80 siloxane repeating units, at least one bisphenol of formula (3), and a carbonate precursor. Such as by¹³Less than 20% of the carbonate linkages formed from the carbonate precursor are between the polydiorganosiloxane blocks as determined by C NMR. In this embodiment, the siloxane block can comprise 50 to 90 weight percent (wt%) of the elastomer. In another embodiment, the siloxane block can comprise 60 wt% to 80 wt%, or 60 wt% to 70 wt% of the elastomer, E can have an average value of 10 to 80 or 10 to 50, and¹³less than 10% of the carbonate linkages formed from the carbonate precursors were between the polydiorganosiloxane blocks as determined by C NMR. In any of these embodiments, preferred polycarbonate blocksThe preferred siloxane blocks derived from bisphenol A are of formula (7), in particular of formula (7a), (7b) or (7 c).

The siloxane block can have a glass transition temperature of-130 ℃ to 50 ℃, or-130 ℃ to-50 ℃. The polycarbonate blocks may have a glass transition temperature of greater than 70 ℃. The poly (carbonate-siloxane) elastomer can have a weight average molecular weight (Mw) of 10,000 daltons (Da) to 100,000 daltons (Da) as measured by gel permeation chromatography using polycarbonate standards.

The poly (carbonate-siloxane) elastomer may have a pre-yield elongation of at least 30% as measured by ASTM D638. In one embodiment, the poly (carbonate-siloxane) elastomer has a pre-yield elongation of at least 40% as measured by ASTM D638. Elastomers have the ability to stretch and recover their original shape. In most embodiments, the elastomer can stretch to at least twice its original length and return very quickly to its original dimensions. In addition to elastic recovery, high (. gtoreq.50 wt%) silicone content poly (carbonate-siloxane) elastomers have a high grip, non-slip surface. Such high friction non-slip surfaces are not observed in low silicone polycarbonate copolymers with smooth surfaces and when force is applied, there is no high grip on the surface with a somewhat flexible. Low silicone poly (carbonate-siloxane) elastomers also do not have elastic recovery, making them less useful for athletic equipment. The poly (carbonate-siloxane) elastomer may have a shore D hardness of 5 to 20 as measured by ASTM D2240, indicating that it is a softer material than other low silicone content polycarbonate copolymers. In other embodiments, the poly (carbonate-siloxane) elastomer can have a light transmission (T%) of 70% or more and a haze level of 10% or less when measured at a thickness of 1.0mm according to ASTM D1003. In yet other embodiments, the poly (carbonate-siloxane) elastomer may have a yellowness index of 10 or less when measured according to ASTM D6290. In any of these embodiments, the preferred polycarbonate block is derived from bisphenol a and the preferred siloxane block is of formula (7), particularly formula (7a), (7b), or (7 c).

In a specific embodiment, the poly (carbonate ester)Siloxane) elastomers may have from 60 to 70% by weight of polysiloxane blocks containing from 30 to 50 diorganosiloxane repeating units, from 30 to 40% by weight of polysiloxane blocks, for example by¹³Less than 10% of the carbonate linkages formed from the carbonate precursors are between siloxane blocks as measured by C NMR, at least 30% elongation before yield as measured by ASTM D638, and a shore D hardness of 5 to 20 as measured by ASTM D2240. Suitable poly (carbonate-siloxane) elastomers are described, for example, in US 8,466,249, and include the poly (carbonate-siloxane-esters) described therein. Thus, the copolymer may further comprise a comonomer consisting of C_6-50Aromatic or aliphatic carboxylic acids (or derivatives thereof, such as salts or acid halides), particularly terephthalic acid, phthalic acid, or combinations thereof. In some embodiments, the poly (carbonate-siloxane) elastomer has less than 100ppm of uncapped hydroxyl (-OH) end groups.

The poly (carbonate-siloxane) elastomer may have a residual chloride content of less than 10 parts per million by weight of elastomer (ppm), a free bisphenol content of less than 200ppm, a residual iron content of less than 5ppm, or a residual organic solvent of less than 300ppm, such as methylene chloride, chloroform, chlorobenzene, dichlorobenzene, toluene, xylene, or a combination comprising at least one of the foregoing.

The poly (carbonate-siloxane) elastomer may be used alone or in combination with one or more other polymers. For example, the poly (carbonate-siloxane) elastomer may be combined with other elastomers, such as natural and synthetic rubbers, such as linear low density polyethylene, poly (ethylene-propylene), styrene-butadiene rubber, polybutadiene, poly (butyl acrylate), silicone rubber, and the like. Alternatively, the poly (carbonate-siloxane) elastomer may be combined with a thermoplastic polymer such as a polyamide, polyaramide, polycarbonate, polyester, polyimide (including polyetherimide), polystyrene, polyurethane, or the like. The relative amounts of poly (carbonate-siloxane) elastomer, other elastomer or other polymer will depend on the particular properties desired and the end use of the composition. In one embodiment, the ratio of poly (carbonate-siloxane) elastomer to other elastomer or other polymer (or both) may be 10:90 to 99:1, or 50:50 to 99: 1.

Optional additives may be used with the poly (carbonate-siloxane) elastomer. These include, for example, fillers; carbon black (useful as a pigment); TiO 2₂(useful as a whitening agent or filler); an optical brightening agent; a surfactant; a processing aid; and so on. In one embodiment, a filler is used. Fillers may be used to adjust the density of the composition containing the poly (carbonate-siloxane) elastomer. Exemplary fillers include talc, clay, TiO₂Barite, glass beads, glass flakes, ground glass, glass fibers, and the like. In other embodiments, the poly (carbonate-siloxane) elastomer may be modified with powdered metals or metal oxides (e.g., tungsten or the like or iron oxide) to increase density. The amount of filler will depend on the particular properties desired and the end use of the composition. For example, the filler may be absent, or present in an amount of 10 to 100 parts by weight of the other component, or present in an amount of 60 parts per 100 parts by weight of the other component. Small particle size fillers, for example less than 5 microns in diameter, are preferred for higher elongation. In some embodiments, the TiO₂May be coated with an inorganic shell comprising silica, alumina, silica alumina or mixtures thereof. The inorganic shell may be further passivated with a silicon compound such as a silane (Si — H functional group) or an alkoxysilane compound or a mixture thereof. Deactivation will result in less chemical reaction/degradation of the molten poly (carbonate-siloxane) elastomer. TiO 2₂May have a particle size of 0.05 microns to 10 microns, or 0.1 microns to 1.0 microns.

In other embodiments, the poly (carbonate-siloxane) elastomer may include a stabilizer to improve thermal and/or photochemical stability. These stabilizers may comprise phosphorus-containing compounds such as phosphites and phosphonites, or hindered phenol compounds, used alone or in combination. Examples of the antioxidant include, but are not limited to, hindered phenols such as tetrakis [ methylene (3, 5-di-t-butyl-4-hydroxyhydrocinnamate) ] -methane, 4' -thiobis (2-methyl-6-t-butylphenol) and thiodiethylene bis (3, 5-di-t-butyl-4-hydroxy) hydrocinnamate, octadecyl-3 (3, 5-di-t-butyl-4-hydroxyphenyl) propionate, pentaerythritol tetrakis (3, 5-) di-t-butyl-4-hydroxyphenyl) propionate, phosphites and phosphonites such as tris (2, 4-di-t-butylphenyl) phosphite, and thio compounds such as dilaurylthiodipropionate, dimyristylthiodipropionate and distearylthiodipropionate, and the like, or combinations comprising at least one of the foregoing. UV photochemical stabilizers include benzotriazoles and benzoxazinones. Benzotriazole UV absorbers are commercially available, for example TINUVIN 234, MIXXIM BB/200 and CYASORB 5411. Other suitable UV absorbers are described in US 5,907,026, which is hereby incorporated by reference. The UV absorber is used in any concentration (typically 0.1 to 5.0 wt% of the total mixture).

In some embodiments, the addition of acids and bases to the resin formulation should be avoided because, for example, they may lead to adverse chemical reactions/degradation of the polycarbonate and/or silicone polymer segments at melt processing temperatures. In some embodiments, the pH of the beneficial additive in the water is from 6.0 to 8.0.

The poly (carbonate-siloxane) elastomer may be transparent and may be combined with various colorants (including colored flakes and the like) to give objects with fluorescent, phosphorescent, reflective, and sparkling appearances. Pigments and dyes that change color at different temperatures may also be used in combination with the elastomer.

The composition comprising the poly (carbonate-siloxane) elastomer may be used in any form, such as an injection molded solid, film, or foam. The foam may be open cell or closed cell. Compositions comprising poly (carbonate-siloxane) elastomers are useful in a variety of articles of sports. For example, the poly (carbonate-siloxane) elastomer composition may be used in sports balls such as soccer, football, baseball, softball, squash, racquetball, tennis, handball, basketball, volleyball, cricket, turf hockey, lacrosse, and golf. Elastomers may be used in the manufacture of other articles such as rackets and grips, sticks, hockey balls, golf clubs, surfboards, diving boards, braces, archer bow parts, and the like. Each of these items benefits from the use of elastomers having a highly desirable combination of properties, including high pre-yield elongation and other desirable mechanical properties.

In some embodiments, the poly (carbonate-siloxane) elastomer foam has a moderate density reduction from an original density of 10 wt% to 30 wt% of the resin. In other embodiments, the foam may be lighter, with a 50% to 90% reduction in density. The foam density and cell structure can be optimized according to the particular needs of the sports article being formed. Poly (carbonate-siloxane) elastomer foams may be preferred for use in shoes to achieve lighter weight.

Particularly when combined with another elastomer, the poly (carbonate-siloxane) elastomers may be used to make more rigid sporting articles such as racquets (e.g., racquet handles), sticks, mallets, hockey sticks, hockey puck, golf clubs, surfboards, and the like. In some embodiments, the article is a rigid sports article having a hollow interior that can be filled with a thermoplastic poly (carbonate-siloxane) elastomer. For example, a tennis racquet frame or handle comprising a glass fiber filled plastic exterior may comprise a poly (carbonate-siloxane) elastomer interior. Another such athletic article may be a golf club, wherein the shaft or the head or both are hollow, having at least a portion of an interior comprising a poly (carbonate-siloxane) elastomer. In other embodiments, the athletic article may be a hockey stick, baseball or cricket stick, mallet, snowboard, or ski having at least a portion of an interior comprising a poly (carbonate-siloxane) elastomer. In other embodiments, the rigid outer portion may comprise metal or plastic, for example, having a thickness of 1 to 30 millimeters.

As described previously, poly (carbonate-siloxane) elastomers have a low Tg segment and generally a low Tg, making them particularly suitable for use in cold weather athletic equipment, such as skis, ski poles, ski signs, snowboards, skates, ski boots, ski goggles, hockey sticks, hockey balls, snowshoes, and cold weather equipment fasteners, among others.

The poly (carbonate-siloxane) elastomers may be used alone or in combination with other elastomers and energy and vibration management materials to make athletic articles. For example, poly (carbonate-siloxane) elastomers may be used as components of wraps or belts, or as components of athletic gloves, such as baseball gloves, cycling gloves, and the like, for shock or vibration management. In other embodiments, the athletic equipment comprising the poly (carbonate-siloxane) elastomer copolymer is safety equipment, such as helmets, chest protectors, shin protectors, breast cups (cups), knee pads, and shoulder pads. The poly (carbonate-siloxane) elastomer may be used in combination with one or more other layers, such as fabric layers or other elastomer layers. In some embodiments, the article of safety equipment comprises a hard outer shell and an inner layer or core of a poly (carbonate-siloxane) elastomer. Another layer, such as a fabric layer or a different elastomer layer, may be disposed on the side of the poly (carbonate-siloxane) elastomer opposite the stiff layer. In other embodiments, a poly (carbonate-siloxane) elastomer foam may be used. Such foams may have a density reduction of 20% to 80% of the original elastomer weight.

In other embodiments, the poly (carbonate-siloxane) elastomer may be used to make soles or supports for shoes, such as athletic shoes, boots, athletic shoes, walking shoes, and running shoes. Poly (carbonate-siloxane) elastomers may be a particularly advantageous component for athletic shoes that involve jumping, such as volleyballs and basketballs. The non-slip "nature of poly (carbonate-siloxane) elastomers makes them useful in soles of athletic shoes such as tennis and basketball shoes, where players must abruptly change direction at high speeds on hard, smooth surfaces without losing traction. The shoe or components thereof may be made from solid or foamed poly (carbonate-siloxane) elastomers, and may be formed by any suitable method (e.g., compression molding, injection molding, additive manufacturing, 3D printing, or otherwise). In some embodiments, the sole of the footwear may include a hollow portion. In other embodiments, the hollow structure comprises a bladder or hollow structure having a poly (carbonate-siloxane) elastomer skin. In some embodiments, the skin may be 0.5 to 5mm thick.

In one embodiment, a thermoplastic poly (carbonate-siloxane) elastomer or composition comprising an elastomer is used to make a two-or multi-piece golf ball having a solid core of at least one layer and a cover of at least one layer. Thermoplastic poly (carbonate-siloxane) elastomers are used to form at least one layer, particularly a core layer, or are used in admixture with other materials to make a core or any layer thereof.

In some embodiments, the ball comprises a dual core having an inner core layer and a surrounding outer core layer or a multi-layer core having an inner core layer, an intermediate core layer, and an outer core layer. In some embodiments, a poly (carbonate-siloxane) elastomer having a siloxane content greater than 50 wt% is used in any core. Lower modulus, higher siloxane content (55 wt% to 75 wt%) elastomers are useful in some applications with excellent performance core structures. In some embodiments, the resulting ball has high elastic and rebound properties. The poly (carbonate-siloxane) elastomeric copolymer can be melt processed to provide properties superior to conventional core or inner layer materials such as natural or synthetic rubber, styrene-butadiene rubber, polybutadiene, poly (butyl acrylate), silicone rubber or copolymers, and combinations thereof.

The core and cover may be single or multi-layered. An intermediate layer may be disposed between the core layer and the cover layer to form a three-piece, four-piece, five-piece ball, or the like. Improved ball performance may be observed in one or more of the following areas: faster rebound, more total energy retained on impact, and longer flight distance. For example, in some embodiments, a golf ball comprising a poly (carbonate-siloxane) elastomer having greater than 100% elastic recovery (e.g., as described in US 8,466,249) may have a higher rebound velocity ratio than a ball comprising a conventional material compared to the initial entry velocity.

Coefficient of restitution ("COR") is a measure of the ratio of the relative velocity of a golf ball after a direct impact with a hard surface to the relative velocity prior to impact with the hard surface. COR may vary between 0 and 1, with 1 corresponding to a fully elastic impact and 0 corresponding to a fully inelastic impact. A golf ball having a COR value close to 1 generally corresponds to a golf ball having a higher initial velocity and a greater total distance when hit by a golf clubA ball. One testing device commonly used in the golf industry for determining COR is the Ball Durability System (Ball Durability System) manufactured by Automated Design Corporation. Alternatively, a method such as Haron, a, and Ismail, k.a, "coefficient of restitution for sport ball: standard drop test ", first International conference on mechanical engineering, series of IPO meetings Material science and engineering, Vol.36 (2012)012038, conference 1(Haron, A.and Ismail, K.A.," Coefficients of restriction of sports balls: A normal drop test ", 1^stCOR was measured by the drop test described in International conference on Mechanical Engineering Research, IPO Conf.series: materials science and Engineering, Volume 36(2012)012038, conference 1).

Golf balls may have different COR values at different initial speeds and temperatures. The inclusion of poly (carbonate-siloxane) elastomers in golf balls is particularly advantageous for increasing COR at lower temperatures (e.g., less than 10 ℃).

The United States Golf Association (USGA) sets limits on the initial velocity of the ball. One goal of golf ball manufacturers is to maximize COR while maintaining compliance with these regulations. Balls with higher rebound velocities have higher COR values. In some embodiments, the ball may have a COR of 0.50 to 0.90. In other embodiments, COR may be 0.83 or less.

In other embodiments, a core comprising a poly (carbonate-siloxane) elastomer may provide a ball with good forward flight distance and a comfortable soft feel.

In other embodiments, a poly (carbonate-siloxane) elastomer foam may be used for at least a portion of the core of a golf ball. Such foams may have a density reduction of 5% to 80% of the original elastomer weight. The foam may be open cell or closed cell.

In yet other embodiments, the core comprising the elastic poly (carbonate-siloxane) elastomer may be covered with or otherwise comprise an ionomeric polyolefin such as described in US 9,636,546, 7,357,736, and 7,211,008. Ionomer polyolefin covers are typically used for excellent cut resistance. In other embodiments, the outer cover of the golf ball comprises polyurethane, which generally imparts better grip and spin to the resulting ball when struck by a golf club.

In some embodiments, the core and cover comprise a filler to adjust the density of the ball to 1.14 grams per cubic centimeter (gm/cc) or higher. Preferably, the filler has a density of about 4gm/cc or greater. The filler may be present in an amount to adjust the density of the core to about 1.18-1.22 gm/cc. The amount of filler can be adjusted to produce a core with a density varying from 1.18gm/cc, depending on the diameter of the core and the thickness and composition of the cover, to produce a golf ball that meets the weight limit (45 grams) set by the professional golfer's governing bodies (e.g., USGA). The amount of filler used in the core and cover may vary from 0 to 60 parts per 100 parts by weight of the composition, depending on the size (thickness) of the components and the desired location of the weight in the ball, provided that the final ball meets the desired weight limitations. The filler may be used for the core instead of the cover, for the cover instead of the core, or both.

The optional filler component of the present invention is selected to impart additional density to the blend of the foregoing components, the selection depending upon the intended use of the composition (e.g., the type of golf ball desired (i.e., one-piece, two-piece, three-piece, or intermediate layer).

The invention is further illustrated by the following examples, which are not intended to limit the claims.