阅读说明：本技术 用于浸渍模塑的胶乳组合物、它的制备方法和由它制造的模制品 (Latex composition for dip molding, process for producing the same, and molded article produced therefrom ) 是由 权元相 余承旭 吴胜焕 郑龙硕 韩政洙 于 2019-11-01 设计创作，主要内容包括：本发明提供一种用于浸渍模塑的胶乳组合物。更具体地,本发明提供一种用于浸渍模塑的胶乳组合物、其制备方法和由其制造的模制品,所述用于浸渍模塑的胶乳组合物包含：羧酸改性的腈类共聚物胶乳和疏水改性的碱溶性乳液增稠剂,其中,所述疏水改性的碱溶性乳液增稠剂包含共聚物,该共聚物包含结合部分和非结合部分,并且所述结合部分包含被一个或多个第一疏水基团取代的来自单体的重复单元,所述第一疏水基团选自具有8至15个碳原子的烷基、烯基、全氟烷基和碳硅烷基,以及具有6至15个碳原子的芳基、芳基烷基、芳基烯基、脂环族烷基和多环烷基。(The present invention provides a latex composition for dip molding. More specifically, the present invention provides a latex composition for dip molding, which comprises: a carboxylic acid-modified nitrile copolymer latex and a hydrophobically modified alkali-soluble emulsion thickener, wherein the hydrophobically modified alkali-soluble emulsion thickener comprises a copolymer comprising a bound portion and an unbound portion, and the bound portion comprises repeating units derived from monomers substituted with one or more first hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 8 to 15 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 6 to 15 carbon atoms.)

1. A latex composition for dip molding, the latex composition comprising: a carboxylic acid-modified nitrile copolymer latex and a hydrophobically-modified alkali-soluble emulsion thickener, wherein,

the hydrophobically modified alkali-soluble emulsion thickener comprises a copolymer comprising a bound portion and an unbound portion, and

the binding moiety comprises repeating units from the monomer substituted with one or more first hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 8 to 15 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 6 to 15 carbon atoms.

2. The latex composition for dip molding according to claim 1, wherein the binding moiety comprises repeating units from the monomer substituted with one or more hydrophobic groups selected from alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 12 to 14 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 10 to 15 carbon atoms.

3. The latex composition for dip molding according to claim 1, wherein the first hydrophobic group is substituted by an alkoxylate of 1 to 100 repeating units.

4. The latex composition for dip molding according to claim 1, wherein the binding moiety further comprises repeating units from the monomer substituted with one or more second hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 16 to 30 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 16 to 30 carbon atoms.

5. The latex composition for dip molding according to claim 4, wherein the binding moiety comprises the repeating unit from a monomer substituted with a first hydrophobic group and the repeating unit from a monomer substituted with a second hydrophobic group in a weight ratio of 1:1 to 10.

6. The latex composition for dip molding according to claim 1, wherein the non-incorporated portion comprises a repeating unit derived from an ethylenically unsaturated acid monomer and a repeating unit derived from an alkyl (meth) acrylate monomer.

7. The latex composition for dip molding according to claim 1, wherein the carboxylic acid-modified nitrile copolymer latex comprises a carboxylic acid-modified nitrile copolymer comprising a repeating unit derived from a conjugated diene-based monomer, a repeating unit derived from an ethylenically unsaturated nitrile-based monomer, and a repeating unit derived from an ethylenically unsaturated acid monomer.

8. The latex composition for dip molding according to claim 1, wherein the hydrophobically modified alkali-soluble emulsion thickener is contained in an amount of 0.01 to 10 parts by weight on a solid content basis, based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex on a solid content basis.

9. A method of preparing a latex composition for dip molding, the method comprising:

preparing carboxylic acid modified nitrile copolymer latex; and

adding a hydrophobically modified alkali-soluble emulsion thickener to the prepared carboxylic acid-modified nitrile copolymer latex, wherein,

the hydrophobically modified alkali-soluble emulsion thickener comprises a copolymer comprising a bound portion and an unbound portion, and

the binding moiety comprises repeating units from the monomer substituted with one or more first hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 8 to 15 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 6 to 15 carbon atoms.

10. A molded article comprising a layer from the latex composition for dip molding of any one of claims 1 to 8.

Technical Field

Cross Reference to Related Applications

This application claims the benefit of priority from korean patent application No. 10-2018-.

Background

As concerns about environment and safety have increased greatly in daily life such as home work, including various technical fields such as food industry, electronic industry and medical field, a demand for gloves for protecting hands has increased, and thus, the market for rubber gloves has also increased greatly.

In the increasingly competitive market for rubber gloves, in order to cope with diversification of glove use and strengthening environmental regulations, demand for differentiated products emphasizing specificity is increasing, rather than inexpensive general-purpose products.

However, the use of conventional natural rubber gloves for medical use is limited, and it is known that natural rubber gloves have allergens such as proteins contained in natural rubber, and the demand for nitrile rubber which can be applied with good quality in various uses and does not contain allergens has increased as compared to natural rubber gloves.

Since nitrile rubber can be applied with various qualities as compared with natural rubber gloves, the use of gloves is classified into the use for thin gloves, industrial use, environment-friendly use, and the like, in addition to soft medical gloves which replace natural rubber gloves.

However, although a latex for gloves having excellent physical properties such as strength and chemical resistance has been developed in order to cope with diversification of glove use, the excellent physical properties and manufacturing workability of gloves have a trade-off relationship, and thus, flow mark properties and syneresis properties are deteriorated, so that productivity of manufacturers is lowered.

Accordingly, there is a need to develop a technology that simultaneously satisfies both the processability during glove manufacturing and the physical properties of gloves manufactured therefrom.

Disclosure of Invention

Technical problem

An object of the present invention is to improve the processability during dip molding using a latex composition for dip molding and to maintain the physical properties of dip molded articles such as gloves made therefrom at an equal or higher level.

An object of the present invention is to provide a latex composition for dip molding, a method for preparing the same, and a dip molded article manufactured from the same, in which a hydrophobically modified alkali soluble emulsion thickener is included during the preparation of a carboxylic acid modified nitrile copolymer latex composition to improve the processability during dip molding and at the same time, the physical properties such as tensile properties of the dip molded article such as gloves manufactured therefrom are maintained at an equal or higher level.

Technical scheme

In one general aspect, a latex composition for dip molding comprises: carboxylic acid-modified nitrile copolymer latex; and a hydrophobically modified alkali-soluble emulsion thickener, wherein the hydrophobically modified alkali-soluble emulsion thickener comprises a copolymer comprising a bonded moiety and a non-bonded moiety, and the bonded moiety comprises repeating units derived from a monomer substituted with one or more hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane (carbosilane) groups having 8 to 15 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 6 to 15 carbon atoms.

In another general aspect, a method of preparing a latex composition for dip molding includes: preparing carboxylic acid modified nitrile copolymer latex; and adding a hydrophobically modified alkali-soluble emulsion thickener to the carboxylic acid-modified nitrile copolymer latex, wherein the hydrophobically modified alkali-soluble emulsion thickener comprises a copolymer comprising a bound portion and a non-bound portion, and the bound portion comprises repeating units derived from monomers substituted with one or more hydrophobic groups selected from the group consisting of alkyl, alkenyl, perfluoroalkyl, and carbosilane groups having 8 to 15 carbon atoms, and aryl, arylalkyl, arylalkenyl, cycloaliphatic alkyl, and polycycloalkyl groups having 6 to 15 carbon atoms.

In yet another general aspect, there is provided a molded article comprising a layer from a latex composition for dip molding.

Advantageous effects

Dip-molded articles such as gloves manufactured using the latex composition for dip molding according to the present invention have excellent processability and maintain physical properties such as tensile properties at an equal or higher level.

Detailed Description