Resol phenolic resin for friction material, method for producing the same, adhesive for friction material, and wet friction plate

Patent metadata

Field	Value
Publication number	US-10259902-B2
Application number	US-201615087232-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

According to the present invention, there is provided a resol phenolic resin for a friction material wherein the resol phenolic resin has a structural unit A represented by Formula (1) and a structural unit B represented by Formula (2):

wherein in Formula (1), m represents an integer of 1 or more; in a case where m is 1, R represents a methylol group; and in a case where m is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group; and

wherein in Formula (2), n represents an integer of 1 or more; in a case where n is 1, R represents a methylol group; and in a case where n is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group.

First claim

What is claimed is:

1. An adhesive for a friction material comprising:
a resol phenolic resin for a friction material; and
a polyvinyl butyral resin,
wherein resol phenolic resin for a friction material has a structural unit A which is modified by dimethylphenol and is represented by Formula (1) and a structural unit B which is represented by Formula (2);

wherein in Formula (1), m represents an integer of 1 or more; in a case where m is 1, R represents a methylol group; and in a case where m is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group; and

wherein in Formula (2), n represents an integer of 1 or more; in a case where n is 1, R represents a methylol group; and in a case where n is 2 or more, R's independently represent a hydrogen atom or a methylol group and at least one R is a methylol group and
wherein when the ratio of the structural unit A with respect to all structural units having a phenolic hydroxyl group contained in the resol phenolic resin for a friction material is defined as a dimethylphenol modification rate, the dimethylphenol modification rate is greater than or equal to 13% and less than or equal to 50%.

2. The adhesive for a friction material according to claim 1 , further comprising resorcin.

3. The adhesive for a friction material according to claim 1 ,
wherein the dimethylphenol is 3,5-dimethylphenol.

4. The adhesive for a friction material according to claim 1 , further comprising an organic solvent.

5. The adhesive for a friction material according to claim 4 , wherein the organic solvent is one selected from the group consisting of methanol, ethanol, propyl alcohol, ethylene glycol, diethylene glycol, triethylene glycol, and glycerin.

6. The adhesive for a friction material according to claim 4 , wherein the organic solvent is toluene or xylene.

7. The adhesive for a friction material according to claim 4 , wherein the organic solvent is toluene.

8. A wet friction plate comprising:
a friction material;
a metal base material; and
an adhesive according to claim 6 interposed between the friction material and the metal base material.

Assignees

• Sumitomo Bakelite Co
• Nsk Warner Kk

Inventors

• Mifuka Hajime
• Hirano Tadashige
• Iso Kenichi

Classifications

• F16D69/04

  Attachment of linings · CPC title

• B32B2255/26

  Polymeric coating · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title

• B32B2250/02

  2 layers · CPC title

• B32B15/00

  Layered products comprising {a layer of} metal · CPC title