Latex for molding use, composition for dip molding use, and dip-molded article

Patent metadata

Field	Value
Publication number	US-9546239-B2
Application number	US-201414768675-A
Country	US
Kind code	B2
Filing date	Feb 20, 2014
Priority date	Feb 22, 2013
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

Provided is a carboxy-modified synthetic isoprene polymer latex for dip molding use, which is produced by the graft polymerization of a synthetic isoprene polymer with a monomer having a carboxyl group in an aqueous phase and contains at least one anionic surfactant, wherein a carboxy-modified synthetic isoprene polymer that constitutes the carboxy-modified synthetic isoprene polymer latex has a tetrahydrofuran-insoluble content of 30 wt % or more.

First claim

The invention claimed is:

1. A carboxyl-modified synthetic isoprene polymer latex for dip molding obtained by graft polymerizing a monomer comprising a carboxyl group onto a synthetic isoprene polymer in an aqueous phase, wherein
the carboxyl-modified synthetic isoprene polymer latex comprises at least one anionic surfactant, and
a carboxyl-modified synthetic isoprene polymer composing the carboxyl-modified synthetic isoprene latex has a tetrahydrofuran-insoluble content of 30 wt % or more.

2. The carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , wherein said anionic surfactant comprises a fatty acid salt, and at least one selected from the group consisting of alkyl benzene sulfonate, alkyl sulfosuccinate, alkyl sulfate and polyoxyethylenealkylether sulfate.

3. The carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , wherein said anionic surfactant comprises alkylbenzene sulfonate, and a fatty acid.

4. The carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , wherein a total content of said anionic surfactant is 0.1 to 3 parts by weight with respect to 100 parts by weight of said carboxyl-modified synthetic isoprene polymer.

5. The carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , wherein the carboxyl-modified synthetic isoprene polymer have the tetrahydrofuran-insoluble content of 60 wt % or more.

6. The carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , comprising 0.1 to 100 weight ppm of alcohol.

7. A carboxyl-modified synthetic isoprene polymer latex for dip molding, wherein
said carboxyl-modified synthetic isoprene polymer latex comprises at least one anionic surfactant,
a carboxyl-modified synthetic polymer comprising the carboxyl-modified synthetic isoprene polymer latex have a tetrahydrofuran-insoluble content of 30 wt % or more, and a swelling degree in tetrahydrofuran of 30 times or less.

8. A composition for a dip molding comprising the carboxyl-modified synthetic isoprene polymer latex for dip molding as set forth in claim 1 , sulfur based vulcanizing agent and a vulcanization accelerator.

9. A dip molded article formed by dip molding the composition for the dip molding as set forth in claim 8 .

10. The dip molded article as set forth in claim 9 , wherein a tear strength measured by ASTM D624-00 (Die C, 500 mm/min) is 30 N/mm or more.

11. The dip molded article as set forth in claim 9 which is a glove.

Assignees

• Zeon Corp

Inventors

• Nakamura Yoshiyuki
• Ishizu Osamu
• Aihara Shunjin

Classifications

• C08L51/04

  grafted on to rubbers · CPC title

• C08K5/42

  Sulfonic acids; Derivatives thereof · CPC title

• C08K5/41

  Compounds containing sulfur bound to oxygen · CPC title

• C08K5/47

  Thiazoles · CPC title

• C08F279/02 Primary

  on to polymers of conjugated dienes · CPC title