Carboxylic acid-modified nitrile-based copolymer latex composition, production method therefor, latex composition containing same for dip molding, and molded product molded therefrom

Patent metadata

Field	Value
Publication number	US-11739199-B2
Application number	US-201916759208-A
Country	US
Kind code	B2
Filing date	Feb 11, 2019
Priority date	Mar 8, 2018
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

Provided are a carboxylic acid-modified nitrile-based copolymer latex composition, a preparation method thereof, a latex composition for dip-molding including the same, and an article molded by the same, the carboxylic acid-modified nitrile-based copolymer latex composition including: a carboxylic acid-modified nitrile-based copolymer, wherein the carboxylic acid-modified nitrile-based copolymer includes a 2-hydroxyethyl methacrylate monomer-derived repeating unit in an amount of more than 0.1 wt % to less than 12 wt %, and a coagulum in the carboxylic acid-modified nitrile-based copolymer latex composition has an amount of less than 1 wt %.

First claim

The invention claimed is:

1. A carboxylic acid-modified nitrile-based copolymer latex composition comprising:
a carboxylic acid-modified nitrile-based copolymer, and
a coagulum,
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, an ethylenically unsaturated acid monomer-derived repeating unit, and a 2-hydroxyethyl methacrylate monomer-derived repeating unit in an amount 1.5 wt % to 6 wt % relative to a total weight of the carboxylic acid-modified nitrile-based copolymer, and
wherein the coagulum is included an amount of less than 1 wt % relative to a total weight of the latex composition.

2. The carboxylic acid-modified nitrile-based copolymer latex composition of claim 1 , wherein the carboxylic acid-modified nitrile-based copolymer includes the conjugated diene-based monomer-derived repeating unit in an amount of 40 wt % to 80 wt %, the ethylenically unsaturated nitrile-based monomer-derived repeating unit in an amount of 10 wt % to 50 wt %, and the ethylenically unsaturated acid monomer-derived repeating unit in an amount of 0.1 wt % to 10 wt %.

3. The carboxylic acid-modified nitrile-based copolymer latex composition of claim 1 , wherein the coagulum is included in an amount of less than 0.01 wt % relative to a total weight of the latex composition.

4. A method of preparing the carboxylic acid-modified nitrile-based copolymer latex composition of claim 1 , comprising:
polymerizing a monomer mixture including 1.5 wt % to 6 wt % of the 2-hydroxyethyl methacrylate monomer with respect to a total amount of the monomer mixture to prepare a carboxylic acid-modified nitrile-based copolymer latex composition including a carboxylic acid-modified nitrile-based copolymer,
wherein
an entire amount of the 2-hydroxyethyl methacrylate monomer included in the monomer mixture is added before the polymerizing is initiated;
a part thereof is added before the polymerization is initiated and the remaining amount thereof is added at a polymerization conversion rate of 20% to 60%; or
the entire amount thereof is added at the polymerization conversion rate of 20% to 60%.

5. A latex composition for dip-molding comprising:
the carboxylic acid-modified nitrile-based copolymer latex composition of claim 1 ; and a cross-linking agent composition.

6. The latex composition for dip-molding of claim 5 , wherein the cross-linking agent composition includes a vulcanization agent and a vulcanization accelerator.

7. The latex composition for dip-molding of claim 5 , wherein the cross-linking agent composition includes a polyvalent metal cation compound.

8. The latex composition for dip-molding of claim 7 , wherein the polyvalent metal cation compound is at least one selected from the group consisting of aluminium glycolate, aluminium acetylacetonate, aluminium lactate, and aluminium tartrate.

9. An article comprising:
a layer derived from the latex composition for dip-molding of claim 5 .

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jung Eun
• Yeu Seung Uk
• Shin Sang Jin
• Kwon Won Sang

Classifications

• C08L15/00 Primary

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title

• C08J5/02

  Direct processing of dispersions, e.g. latex, to articles · CPC title

• C08K3/011

  Crosslinking or vulcanising agents, e.g. accelerators · CPC title

• C08K3/105

  Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table · CPC title

• C08C19/44

  of polymers containing metal atoms exclusively at one or both ends of the skeleton · CPC title