Composition for dip molding and dip-molded article

Patent metadata

Field	Value
Publication number	US-10414908-B2
Application number	US-201515128163-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 28, 2014
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A dip-molding composition of the present invention contains a latex (A) of a nitrile-group-containing highly saturated copolymer rubber (a). The nitrile-group-containing highly saturated copolymer rubber (a) contains an α,β-ethylenically unsaturated nitrile monomer unit and a conjugated diene monomer unit, and being obtained by hydrogenating at least part of the conjugated diene monomer unit. A dip-molded article of the present invention is produced by dip molding of the above dip-molding composition.

First claim

The invention claimed is:

1. A dip-molded article produced by dip-molding in a dip-molding composition, the composition comprising:
a latex (A) containing a nitrile-group-containing highly saturated copolymer rubber (a), wherein:
the nitrile-group-containing highly saturated copolymer rubber (a) contains: (i) an α,β-ethylenically unsaturated nitrile monomer unit, (ii) an α,β-ethylenically unsaturated acid monomer unit in an amount of from 2 wt % to 6 wt %, and (iii) a conjugated diene monomer unit, and
the nitrile-group-containing highly saturated copolymer rubber (a) is obtained by hydrogenating at least part of the conjugated diene monomer unit, and
wherein no crack occurs in a strip of the dip-molded article in a case where (i) the strip is cut from the dip-molded article so as to have a width of 2 cm and a length of 10 cm, and (ii) the strip is placed in an environment at a temperature of 130° C. for 6 days and then bent in an environment at a temperature of −30° C. such that tangents at respective lengthwise ends of the strip curved in a length direction of the strip make an angle of 90°.

2. The dip-molding article as set forth in claim 1 , wherein:
the nitrile-group-containing highly saturated copolymer rubber (a) has an iodine value of 100 or less.

3. The dip-molding article as set forth in claim 1 , wherein the composition further comprises a crosslinking agent.

4. The dip-molded article as set forth in claim 1 , wherein the dip-molded article is a glove.

5. The dip-molded article as set forth in claim 1 , wherein the dip-molded article has a tensile strength of 35 MPa or more.

6. The dip-molded article as set forth in claim 3 , wherein the crosslinking agent is zinc oxide.

Assignees

• Zeon Corp

Inventors

• Nakashima Tomonori
• Nagamori Hiroyasu
• Inoue Sayaka

Classifications

• C08L15/00 Primary

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

• C08L13/02

  Latex · CPC title

• C08L9/04

  Latex · CPC title

• C08L15/005 Primary

  Hydrogenated nitrile rubber · CPC title

• B29C41/14 Primary

  Dipping a core {(B29C41/10 takes precedence)} · CPC title