Latex for friction member use and friction member

Patent metadata

Field	Value
Publication number	US-9969886-B2
Application number	US-201515539532-A
Country	US
Kind code	B2
Filing date	Dec 18, 2015
Priority date	Dec 26, 2014
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A latex for friction member use including rubber particles comprised of a carboxyl group-containing highly saturated nitrile rubber containing α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, wherein a difference Δd (Δd=d90−d50) between a volume cumulative 90% particle size (d90) of the rubber particles and volume cumulative 50% particle size (d50) of the rubber particles which are measured by a light scattering method is 0.0240 μm or more is provided.

First claim

The invention claimed is:

1. A latex for friction member use comprising rubber particles comprised of a carboxyl group-containing highly saturated nitrile rubber containing α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less,
wherein a difference Δd (Δd=d90−d50) between a volume cumulative 90% particle size (d90) of the rubber particles and volume cumulative 50% particle size (d50) of the rubber particles which are measured by a light scattering method is 0.0240 μm or more.

2. The latex for friction member use according to claim 1 , wherein the carboxyl group-containing highly saturated nitrile rubber 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 90 wt % of conjugated diene monomer units (including hydrogenated ones).

3. The latex for friction member use according to claim 2 , wherein the carboxyl group-containing monomer units are α,β-ethylenically unsaturated monocarboxylic acid monomer units.

4. A latex composition for friction member use comprising the latex for friction member use according to claim 1 and a thermosetting resin.

5. The latex composition for friction member use according to claim 4 , wherein the thermosetting resin is one or more types selected from an epoxy resin and phenol resin.

6. The latex composition for friction member use according to claim 4 , wherein a content of the thermosetting resin is 40 to 500 parts by weight with respect to 100 parts by weight of the carboxyl group-containing highly saturated nitrile rubber.

7. A friction member obtained by adhering the latex composition for friction member use according to claim 5 to a base material.

Assignees

• Zeon Corp

Inventors

• Inoue Sayaka
• Nakashima Tomonori

Classifications

• C08L13/02

  Latex · CPC title

• C08L101/08 Primary

  Carboxyl groups · CPC title

• C09K3/14

  Anti-slip materials; Abrasives {(products specifically intended for the fabrication of abrasive tools, blocks or papers, or for operations of the kind of sand-blasting and barrelling B24B31/14, B24C1/00; polishing compositions containing abrasive or grinding agents C09G1/02; friction compositions for brakes or clutches F16D69/02; polishing of semi-conductors H10P52/40)} · CPC title

• F16D69/02

  Composition of linings {; Methods of manufacturing} · CPC title

• C08L33/18

  Homopolymers or copolymers of nitriles · CPC title