Latex composition for dip molding, dip-molded product comprising same, and method for manufacturing dip-molded product by using same
AssigneeLG Chem, Ltd.
InventorsWon Sang Kwon, Tae Shik Yoon, Jung Su Han, Myung Su Jang
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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.
Claims12
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,
- wherein each of the three or more branched chains included in the reactive compound comprises a repeating unit represented by Formula 1,
- wherein A is an alkylene group having 2 to 5 carbon atoms, and n is an integer of 150 to 250.
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,
- wherein each of the three or more branched chains included in the reactive compound comprises a repeating unit represented by Formula 1,
- wherein A is an alkylene group having 2 to 5 carbon atoms, and n is an integer of 150 to 250.
A method of preparing a latex composition for dip molding, the method comprising:
- step S10:
- 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 S20:
- 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 S10, the step S20, or both the step S10 and the step S20,
- wherein each of the three or more branched chains included in the reactive compound comprises a repeating unit represented by Formula 1,
- wherein A is an alkylene group having 2 to 5 carbon atoms, and n is an integer of 150 to 250.
Dependencies are inferred from the claim text.