Carboxylic acid modified-nitrile based copolymer latex for dip-forming, latex composition for dip-forming comprising the same, and product thereof
First Claim
1. A carboxylic acid-modified nitrile copolymer latex for dip molding comprising:
- a carboxylic acid-modified nitrile copolymer latex having a glass transition temperature of −
50°
C. to −
15°
C. and an average particle diameter not less than 90 nm and not more than 200 nm; and
a carboxylic acid-modified styrene copolymer latex having a glass transition temperature of 80°
C. or higher and an average particle diameter not less than 15 nm and less than 90 nm,wherein the carboxylic acid-modified nitrile copolymer latex and the carboxylic acid-modified styrene copolymer latex are present at a weight ratio of 97;
3 to 85;
15, andwherein the carboxylic acid-modified styrene copolymer latex is polymerized from a monomer mixture comprising 80 to 99% by weight of an aromatic vinyl monomer, 1 to 20% by weight of an ethylenically unsaturated nitrile monomer, and 0.1 to 10% by weight of an ethylenically unsaturated acid monomer.
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Abstract
Disclosed are a carboxylic acid-modified nitrile copolymer latex for dip molding comprising a combination of a carboxylic acid-modified nitrile copolymer latex and a carboxylic acid-modified styrene copolymer latex, a latex composition for dip molding comprising the same and a molded article prepared therefrom. Molded articles with superior tensile strength are produced by respectively preparing a carboxylic acid-modified nitrile latex having a low glass transition temperature and an average particle diameter of 90 nm or higher, and a carboxylic acid-modified styrene latex having a glass transition temperature of 80° C. or higher and an average particle diameter less than 90 nm and then mixing the two latexes.
4 Citations
16 Claims
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1. A carboxylic acid-modified nitrile copolymer latex for dip molding comprising:
-
a carboxylic acid-modified nitrile copolymer latex having a glass transition temperature of −
50°
C. to −
15°
C. and an average particle diameter not less than 90 nm and not more than 200 nm; anda carboxylic acid-modified styrene copolymer latex having a glass transition temperature of 80°
C. or higher and an average particle diameter not less than 15 nm and less than 90 nm,wherein the carboxylic acid-modified nitrile copolymer latex and the carboxylic acid-modified styrene copolymer latex are present at a weight ratio of 97;
3 to 85;
15, andwherein the carboxylic acid-modified styrene copolymer latex is polymerized from a monomer mixture comprising 80 to 99% by weight of an aromatic vinyl monomer, 1 to 20% by weight of an ethylenically unsaturated nitrile monomer, and 0.1 to 10% by weight of an ethylenically unsaturated acid monomer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification