Cross-linked rubber

Patent metadata

Field	Value
Publication number	US-10081695-B2
Application number	US-201515514580-A
Country	US
Kind code	B2
Filing date	Sep 25, 2015
Priority date	Sep 29, 2014
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A cross-linked rubber obtained by cross-linking a nitrile rubber composition, wherein the nitrile rubber composition contains a carboxyl group-containing nitrile rubber (a) with an iodine value of 120 or less and a diurethane compound (b) represented by a following general formula (1), a content of the diurethane compound (b) in the nitrile rubber composition is 5 to 15 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (a), and a tensile strength of the cross-linked rubber based on JIS K6251 is 15 MPa or more and an elongation at break of the cross-linked rubber based on JIS K6251 is 300% or more, is provided.

First claim

The invention claimed is:

1. A cross-linked rubber obtained by cross-linking a nitrile rubber composition, wherein
the nitrile rubber composition contains a carboxyl group-containing nitrile rubber (a) with an iodine value of 120 or less and a diurethane compound (b) represented by a following general formula (1),
a content of the diurethane compound (b) in the nitrile rubber composition is 5 to 15 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (a), and
a tensile strength of the cross-linked rubber based on JIS K6251 is 15 MPa or more and an elongation at break of the cross-linked rubber based on JIS K6251 is 300% or more:

wherein, in the general formula (1), R 1 is a linear or branched bivalent aliphatic alkylene group having 1 to 20 carbon atoms, a bivalent alicyclic cycloalkylene group, or a bivalent aromatic group, R 2 is a group giving a diamine by breaking down by action of a basic compound when made a carbamate structure, X 1 is —CH 2 —, —CH 2 CH 2 —, or a chemical single bond, and X 2 is —SO 2 — or a chemical single bond.

2. The cross-linked rubber according to claim 1 , wherein the diurethane compound (b) is a compound represented by the following general formula (2):

wherein, in the general formula (2), “m” is 4, 5, or 6.

3. The cross-linked rubber according to claim 2 , wherein the diurethane compound (b) is a compound represented by the following general formula (3).

4. The cross-linked rubber according to claim 1 , wherein the carboxyl group-containing nitrile rubber (a) contains 10 to 60 wt % of α,β-ethylenically unsaturated nitrile monomer units, 0.1 to 20 wt % of carboxyl group-containing monomer units, and 20 to 89.9 wt % of conjugated diene monomer units (including also hydrogenated parts).

5. The cross-linked rubber according to claim 4 , wherein the carboxyl group-containing monomer units are α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units.

6. The cross-linked rubber according to claim 1 , wherein a content of the carboxyl group in the carboxyl group-containing nitrile rubber (a) is 5×10 −4 to 5×10 −1 ephr.

7. The cross-linked rubber according to claim 1 , wherein a content of the diurethane compound (b) in the nitrile rubber composition is 6.0 to 12 parts by weight with respect to 100 parts by weight of the carboxyl group-containing nitrile rubber (a).

8. The cross-linked rubber according to claim 1 , wherein the nitrile rubber composition further contains a basic cross-linking accelerator (c).

9. A hose comprising a cross-linked rubber according to claim 1 .

Assignees

• Zeon Corp

Inventors

• Mori Kentaro

Classifications

• C08K5/205

  Compounds containing [IMAGE cpc-sch-C08K-1010.gif] groups, e.g. carbamates · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• C08L13/00

  Compositions of rubbers containing carboxyl groups · CPC title

• C08F236/14 Primary

  containing elements other than carbon and hydrogen · CPC title

• C08L15/005

  Hydrogenated nitrile rubber · CPC title