Latex Composition for Dip Molding, Dip-Molded Product Comprising Same, and Method for Manufacturing Dip-Molded Product By Using Same

Patent metadata

Field	Value
Publication number	US-2022098351-A1
Application number	US-202017421822-A
Country	US
Kind code	A1
Filing date	Aug 12, 2020
Priority date	Oct 1, 2019
Publication date	Mar 31, 2022
Grant date	—

Abstract

The present invention relates to a latex composition for dip molding, and such latex composition includes: a carboxylic acid-modified nitrile-based copolymer latex; and a reactive compound having three or more branched chains and a reactive group at a terminal of each of the branched chains, wherein the reactive group is one or more selected from the group consisting of an amine group, a hydroxy group, an epoxy group, a glycidyl group, and an isocyanate group.

First claim

1 . A latex composition for dip molding, the latex composition comprising:
a carboxylic acid-modified nitrile-based copolymer latex; and a reactive compound having three or more branched chains and a reactive group at a terminal of each of the three or more branched chains, wherein the reactive group is one or more selected from the group consisting of an amine group, a hydroxy group, an epoxy group, a glycidyl group, and an isocyanate group.

2 . The latex composition of claim 1 , wherein each of the three or more branched chains included in the reactive compound includes a repeating unit represented by the following Formula 1,

wherein A is an alkylene group having 2 to 5 carbon atoms, and n is an integer of 1 to 500.

3 . The latex composition of claim 1 , wherein the reactive compound is represented by the following Formula 2,

wherein n is an integer of 1 to 500, and R1 to R4 are each independently one selected from the group consisting of an amine group, a hydroxy group, an epoxy group, a glycidyl group, and an isocyanate group.

4 . The latex composition of claim 3 , wherein the reactive compound has a weight average molecular weight is of 450 to 40,000.

5 . The latex composition claim 1 , wherein the reactive compound is included in 0.1 parts by weight to 5 parts by weight based on a solid content of 100 parts by weight of the carboxylic acid-modified nitrile-based copolymer latex.

6 . The latex composition of claim 1 , further comprising a sulfur component, a vulcanization accelerator, and a cross-linking agent,
wherein the sulfur component is included in 0.8 parts by weight or less, the vulcanization accelerator is included in 0.6 parts by weight or less, and the cross-linking agent is included in 1.1 parts by weight or less, based on a solid content of 100 parts by weight of the carboxylic acid-modified nitrile-based copolymer latex.

7 . The latex composition of claim 1 , wherein the carboxylic acid-modified nitrile-based copolymer includes a conjugated diene-based monomer-derived repeating unit, an ethylenically unsaturated nitrile-based monomer-derived repeating unit, and an ethylenically unsaturated acid monomer-derived repeating unit.

8 . A cross-linked polymer comprising:
two or more parts derived from a carboxylic acid-modified nitrile-based copolymer; a part derived from a reactive compound having three or more branched chains and a reactive group at a terminal of each of the three or more branched chains; and a cross-linking part formed by cross-linking a carboxylic acid group included in the carboxylic acid-modified nitrile-based copolymer and the reactive group included in the reactive compound.

9 . A method of preparing a latex composition for dip molding, the method comprising:
step S 10 : emulsion-polymerizing a monomer mixture including a conjugated diene-based monomer, an ethylenically unsaturated nitrile-based monomer, and an ethylenically unsaturated acid monomer to obtain a carboxylic acid-modified nitrile-based copolymer latex; and step S 20 : selectively adding a sulfur component, a vulcanization accelerator, and a cross-linking agent in the presence of the obtained carboxylic acid-modified nitrile-based copolymer latex, wherein a reactive compound having three or more branched chains and a reactive group at a terminal of each of the three or more branched chains is added in the step S 10 , the step S 20 , or both the step S 10 and the step S 20 .

10 . The method of claim 9 , wherein the reactive compound is added in an amount of 0.1 parts by weight to 5 parts by weight, the sulfur component is added in an amount of 0.8 parts by weight or less, the vulcanization accelerator is added in an amount of 0.6 parts by weight or less, and the cross-linking agent is added in an amount of 1.1 parts by weight or less, based on a solid content of 100 parts by weight of the carboxylic acid-modified nitrile-based copolymer latex.

11 . The method of claim 9 , wherein the reactive compound added in the step S 10 is added to the monomer mixture, to the obtained carboxylic acid-modified nitrile-based copolymer latex, or to both the monomer mixture and the obtained carboxylic acid-modified nitrile-based copolymer latex.

12 . The method of claim 9 , wherein the cross-linking agent is zinc oxide or titanium oxide.

13 . A dip-molded article comprising a layer derived from the latex composition for dip molding of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Kwon Won Sang
• Yoon Tae Shik
• Han Jung Su
• Jang Myung Su

Classifications

• C08L13/02 Primary

  Latex · CPC title

• C08J2313/02

  Latex · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K5/06

  Ethers; Acetals; Ketals; Ortho-esters · CPC title

• C08K5/1515

  Three-membered rings · CPC title