US 11,834,537 B2
Carboxylic acid modified-nitrile based copolymer latex and latex composition for dip-forming comprising the copolymer latex and article formed by the composition
Ji Young Lee, Daejeon (KR); Jung Eun Kim, Daejeon (KR); Won Sang Kwon, Daejeon (KR); Seung Uk Yeu, Daejeon (KR); and Myung Su Jang, Daejeon (KR)
Assigned to LG Chem, Ltd.
Appl. No. 17/441,903
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Feb. 8, 2021, PCT No. PCT/KR2021/001627
§ 371(c)(1), (2) Date Sep. 22, 2021,
PCT Pub. No. WO2021/201417, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 10-2020-0039060 (KR), filed on Mar. 31, 2020; application No. 10-2020-0039065 (KR), filed on Mar. 31, 2020; application No. 10-2020-0039067 (KR), filed on Mar. 31, 2020; application No. 10-2020-0039071 (KR), filed on Mar. 31, 2020; application No. 10-2020-0039074 (KR), filed on Mar. 31, 2020; application No. 10-2020-0039076 (KR), filed on Mar. 31, 2020; and application No. 10-2020-0173031 (KR), filed on Dec. 11, 2020.
Prior Publication US 2022/0227910 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 236/12 (2006.01)
CPC C08F 236/12 (2013.01) 16 Claims
 
1. A latex composition for dip molding comprising: a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying the following Formulas 1 and 2,
wherein a carboxylic acid-modified nitrile-based copolymer of the carboxylic acid-modified nitrile-based copolymer latex includes: a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit:
0.85≤P≤1.0,P=CVD/CV0  [Formula 1]
5≤M≤20,M=m1×m2  [Formula 2]
wherein CV0 represents a capillary viscosity of the carboxylic acid-modified nitrile-based copolymer latex which is measured in a swollen state in a methyl ethyl ketone solvent,
CVD represents a capillary viscosity of the carboxylic acid-modified nitrile-based copolymer latex in a deswollen state,
m1 represents an insolubility of a dried film of the carboxylic acid-modified nitrile-based copolymer latex in the methyl ethyl ketone solvent, and
m2 represents a swelling index of the dried film of the carboxylic acid-modified nitrile-based copolymer latex in the methyl ethyl ketone solvent.