Latex of the highly saturated nitrile rubber and adhesive composition

Patent metadata

Field	Value
Publication number	US-11365331-B2
Application number	US-202017009147-A
Country	US
Kind code	B2
Filing date	Sep 1, 2020
Priority date	Mar 27, 2014
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A latex of a highly saturated nitrile rubber wherein the highly saturated nitrile rubber contains α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt %, has an iodine value of 120 or less, and has a weight average molecular weight of solubles in chloroform of 100,000 or less, and when removing volatiles contained in the latex and making a film of the highly saturated nitrile rubber, a loss tangent tan δ(50° C.) at 50° C. of the film is 0.3 to 0.6 and a complex torque S* at the time of 100% shear strain at 100° C. of the film is 20 dNm or less, and an adhesive composition containing the latex are provided.

First claim

The invention claimed is:

1. An adhesive composition comprising a latex of a highly saturated nitrile rubber,
wherein the highly saturated nitrile rubber contains α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and diene monomer units in a ratio of 40 wt % or more, has an iodine value of 120 or less, and has a weight average molecular weight of solubles in chloroform of 100,000 or less,
when removing volatiles contained in the latex and making a film of the highly saturated nitrile rubber, a loss tangent tan δ (50° C.) at 50° C. of the film is 0.3 to 0.6 and a complex torque S* at the time of 100% shear strain at 100° C. of the film is 20 dNm or less, and
the highly saturated nitrile rubber is obtained through a polymerization with a molecular weight modifier added at a middle stage during which a polymerization conversion rate is in a range of 15 to 60 wt % such that the loss tangent tan δ (50° C.) is 0.3 to 0.6 and the complex torque S* is 20 dNm or less.

2. The adhesive composition according to claim 1 , further comprising a resorcinol formaldehyde resin.

3. The adhesive composition according to claim 2 , wherein a content of the resorcinol formaldehyde resin is 5 to 30 parts by weight with respect to 100 parts by weight of a solid content of the latex of a highly saturated nitrile rubber.

4. The adhesive composition according to claim 1 , wherein the highly saturated nitrile rubber contains the diene monomer units in a ratio of 40 to 89.9 wt %.

5. A fiber base material-highly saturated nitrile rubber composite obtained by bonding a fiber base material and a highly saturated nitrile rubber using the adhesive composition according to claim 1 .

6. The adhesive composition according to claim 1 , wherein the middle stage is a stage during which the polymerization conversion rate is in a range of 15 to 45 wt %.

7. The adhesive composition according to claim 1 , wherein the middle stage is a stage during which the polymerization conversion rate is in a range of 20 to 40 wt %.

Assignees

• Zeon Corp

Inventors

• Nakashima Tomonori
• Senda Osamu

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• C08F236/12

  with nitriles · CPC title

• C09J161/14

  Modified phenol-aldehyde condensates · CPC title

• C08K7/02

  Fibres or whiskers · CPC title

• C08C19/02

  Hydrogenation · CPC title