阅读说明：本技术 水性聚合物胶乳 (Aqueous polymer latex ) 是由 R·巴尔克 B·罗梅杰 R·弗拉齐德洛 于 2020-05-07 设计创作，主要内容包括：本发明涉及通过单体M的水性乳液聚合可获得的成膜共聚物的水性聚合物胶乳,所述单体M包含基于单体M计至少80重量％的以下单体：-至少一种非离子单体M1,其选自丙烯酸的C-(1)-C-(20)-烷基酯、丙烯酸的C-(5)-C-(20)-环烷基酯、甲基丙烯酸的C-(1)-C-(20)-烷基酯、甲基丙烯酸的C-(5)-C-(20)-环烷基酯和单乙烯基芳族单体；-一种或多种单烯键式不饱和单体M2,其选自具有3至6个碳原子的单烯键式不饱和一元羧酸和具有4至6个碳原子的单烯键式不饱和二元羧酸；其中所述聚合物胶乳包含乳化剂组合,所述乳化剂组合包含：i.至少一种第一乳化剂(1),其选自乙氧基化度为5至20的硫酸化乙氧基化C-(8)-C-(20)-链烷醇的盐和乙氧基化度为5至20的硫酸化乙氧基化三苯乙烯基苯酚的盐,特别是碱金属盐和铵盐,和ii.至少一种第二乳化剂(2),其选自乙氧基化度为21至50的硫酸化乙氧基化C-(8)-C-(20)-链烷醇的盐和乙氧基化度为21至50的硫酸化乙氧基化三苯乙烯基苯酚的盐,特别是碱金属盐和铵盐。本发明还涉及制备所述聚合物胶乳的方法,以及这些聚合物胶乳作为基料在含有至少一种无机单宁封闭化合物的水性涂料组合物中的用途,以及所述涂料组合物用于涂覆含单宁的基材(例如木材或木基材料)的用途。(The invention relates to an aqueous polymer latex of a film-forming copolymer obtainable by aqueous emulsion polymerization of a monomer M comprising at least 80% by weight, based on the monomer M, of the following monomers: at least one non-ionic monomer M1 chosen from C of acrylic acid 1 ‑C 20 Alkyl esters, acrylic acid C 5 ‑C 20 C of cycloalkyl esters, methacrylic acid 1 ‑C 20 Alkyl esters, methacrylic acid C 5 ‑C 20 -cycloalkyl esters and monovinylaromatic monomers; -one or more monoethylenically unsaturated monomers M2 selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6 carbon atoms and monoethylenically unsaturated dicarboxylic acids having 4 to 6 carbon atoms; wherein the polymer latex comprises an emulsifier combination comprising: i. at least one first emulsifier (1) selected from sulfated ethoxylated C's having a degree of ethoxylation of from 5 to 20 8 ‑C 20 A salt of an alkanol and a salt, in particular an alkali metal salt and an ammonium salt, of a sulfated ethoxylated tristyrylphenol having a degree of ethoxylation of from 5 to 20, and ii at least one second emulsifier (2) selected from sulfated ethoxylated C's having a degree of ethoxylation of from 21 to 50 8 ‑C 20 -salts of alkanols and salts, in particular alkali metal salts and ammonium salts, of sulfated ethoxylated tristyrylphenols having a degree of ethoxylation of from 21 to 50. The invention also relates to a method for producing said polymer latices, to the use of said polymer latices as binders in aqueous coating compositions containing at least one inorganic tannin-blocking compound, and to the use of said coating compositions for coating tannin-containing substrates, such as wood or wood-based materials.)

1. An aqueous polymer latex of a film-forming copolymer obtainable by aqueous emulsion polymerization of monomers M comprising at least 80% by weight, based on monomers M, of the following monomers:

at least one non-ionic monomer M1 chosen from C of acrylic acid₁-C₂₀Alkyl esters, acrylic acid C₅-C₂₀C of cycloalkyl esters, methacrylic acid₁-C₂₀Alkyl esters, methacrylic acid C₅-C₂₀-cycloalkyl esters and monovinylaromatic monomers;

-one or more monoethylenically unsaturated monomers M2 selected from monoethylenically unsaturated monocarboxylic acids having 3 to 6 carbon atoms and monoethylenically unsaturated dicarboxylic acids having 4 to 6 carbon atoms;

wherein the polymer latex comprises an emulsifier combination comprising:

i. at least one first emulsifier (1) selected from sulfated ethoxylated C's having a degree of ethoxylation of from 5 to 20₈-C₂₀-salts of alkanols and of sulfated ethoxylated tristyrylphenols having a degree of ethoxylation of from 5 to 20, and

at least one second emulsifier (2) selected fromSulfated ethoxylate C with degree of ethoxylation of 21 to 50₈-C₂₀-salts of alkanols and salts of sulfated ethoxylated tristyrylphenols having a degree of ethoxylation of 21 to 50.

2. The aqueous polymer latex according to claim 1, wherein the first emulsifier (1) is selected from sulfated ethoxylated C's having a degree of ethoxylation of from 5 to 20₈-C₂₀Alkali metal and ammonium salts of alkanols.

3. The aqueous polymer latex according to any of the preceding claims, wherein the second emulsifier (2) is selected from sulfated ethoxylated C's having a degree of ethoxylation of from 21 to 50₈-C₂₀Alkali metal and ammonium salts of alkanols.

4. The aqueous polymer latex according to any of the preceding claims, wherein the weight ratio of the first emulsifier (1) to the second emulsifier (2) is from 15:85 to 70:30, in particular from 25:75 to 60: 40.

5. The aqueous polymer latex according to any of the preceding claims, wherein the total amount of emulsifier present in the aqueous polymer latex is from 0.1 to 5 wt. -%, in particular from 0.2 to 4 wt. -%, based on the film-forming copolymer.

6. The aqueous polymer latex of any one of the preceding claims, wherein the amount of the first emulsifier and the second emulsifier comprises at least 90 wt% of the total amount of emulsifiers comprised in the polymer latex.

7. The aqueous polymer latex according to any one of the preceding claims, wherein the Z-average particle diameter of the copolymer particles comprised in the polymer latex, determined by quasielastic light scattering, is from 40 to 500nm, in particular from 50 to 350 nm.

8. The aqueous polymer latex of any one of the preceding claims, wherein the monomer M1 is a mixture of the following monomers:

at least one monomer M1a chosen from acrylic acid C₁-C₂₀C of alkyl esters and methacrylic acid₅-C₂₀-an alkyl ester; and

at least one monomer M1b chosen from monovinylaromatic monomers and C of methacrylic acid₁-C₄-alkyl esters and mixtures thereof.

9. The aqueous polymer latex of any one of the preceding claims, wherein the monomer M2 is selected from acrylic acid, methacrylic acid, and mixtures thereof.

10. The aqueous polymer latex of any one of the preceding claims, wherein the monomer M further comprises at least one monomer M3 selected from nonionic monoethylenically unsaturated monomers having functional groups selected from hydroxyalkyl groups, primary carboxamide groups, urea groups and ketone groups.

11. The aqueous polymer latex of any one of the preceding claims, wherein the monomer M consists of:

85 to 99.95% by weight, based on the total weight of the monomers contained in the monomer composition M, of an ethylenically unsaturated monomer M1;

-0.05 to 5 wt% of one or more monoethylenically unsaturated monomers M2, based on the total weight of the monomers comprised in the monomer composition M;

-from 0 to 14.95% by weight, based on the total weight of monomers comprised in the monomer composition M, of one or more nonionic monomers M3.

12. The aqueous polymer latex according to any of the preceding claims, comprising a first phase of a copolymer and a second phase of a copolymer, the first phase of the copolymer having a glass transition temperature Tg (1) of from-25 ℃ to +60 ℃, in particular from-10 ℃ to +50 ℃, the second phase of the copolymer having a glass transition temperature Tg (2) of from +50 ℃ to +150 ℃, in particular from +60 ℃ to +120 ℃, with the proviso that the absolute value of |. Tg (2) -Tg (1) | is at least 10 ℃.

13. The aqueous polymer latex according to any of the preceding claims, obtainable by aqueous emulsion polymerization of monomers M in the presence of a combination of emulsifiers.

14. A process for preparing the aqueous polymer latex of any of the preceding claims, comprising carrying out an aqueous emulsion polymerization of monomer M in the presence of a combination of emulsifiers.

15. The process of claim 14, wherein the aqueous emulsion polymerization is carried out by a monomer feed process, wherein at least 90% of the monomer M to be polymerized is fed into the polymerization vessel in the form of an aqueous emulsion of monomers comprising at least a portion of the second emulsifier.

16. The method of claim 15, wherein the reaction vessel contains at least a portion of the first emulsifier prior to beginning the feeding of the aqueous emulsion of monomers.

17. The method of any one of claims 14 to 16, wherein the aqueous emulsion polymerization is a multi-stage aqueous emulsion polymerization comprising:

i. aqueous emulsion polymerization monomer composition MⁱCorresponding to the theoretical glass transition temperature Tg according to Fox^t(i) Is from-25 ℃ to +60 ℃, in particular from-10 ℃ to +50 ℃, to obtain a first-stage polymer latex, and

aqueous emulsion polymerization monomer composition M in a first stage Polymer latexⁱⁱIn the second stage of (2), in which the monomer composition MⁱⁱCorresponds to the theoretical glass transition temperature Tg according to Fox^t(ii) From 50 ℃ to 150 ℃, in particular from 60 ℃ to 120 ℃, with the proviso that the temperature difference Tg is^t(ii)–Tg^t(i) Is at least 10 ℃.

18. The method of any one of claims 14 to 16, wherein the aqueous emulsion polymerization is a multi-stage aqueous emulsion polymerization comprising:

i. aqueous emulsion polymerization monomer composition MⁱCorresponding to the theoretical glass transition temperature Tg according to Fox^t(i) From 50 ℃ to 150 ℃, in particular from 60 ℃ to 120 ℃, to obtain a first-stage polymer latex, and

aqueous emulsion polymerization monomer composition M in a first stage Polymer latexⁱⁱIn the second stage of (2), in which the monomer composition MⁱⁱCorresponds to the theoretical glass transition temperature Tg according to Fox^t(ii) Is from-25 ℃ to +60 ℃, in particular from-10 ℃ to +50 ℃, with the proviso that the temperature difference Tg is^t(i)–Tg^t(ii) Is at least 10 ℃.

19. An aqueous coating composition comprising:

a) a binder polymer in the form of an aqueous polymer latex as defined in any one of claims 1 to 13; and

b) at least one inorganic tannin blocking compound.

20. The coating composition of claim 19 wherein the inorganic tannin blocking compound is selected from the group consisting of oxides, phosphates, and phosphosilicates of polyvalent metals selected from the group consisting of zinc, aluminum, zirconium, barium, and strontium.

21. The coating composition of claim 19 or 20, wherein the inorganic tannin blocking compound comprises zinc oxide.

22. The coating composition of any one of claims 19 to 21, further comprising a titanium dioxide pigment.

23. Use of a coating composition according to any one of claims 19 to 22 for coating a tannin containing substrate.