# US 4,397,910 A · Light weight high temperature polyester laminates useful as lubricating rub strips

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- Number: US 4,397,910 A
- Document ID: US4397910A
- Status: Granted
- Kind: A
- Application number: 06/384,352
- Filed: 1982-06-02
- Granted: 1983-08-09
- Earliest claimed: 1982-06-02
- Assignees: Westinghouse Electric Corp.
- Inventors: Melvin E. Benson; Harold O. McCaskey
- Web page: https://patentgrep.com/patent/US4397910A

## CPC

- B32B 5/28: impregnated with or embedded in a plastic substance {(not used)}
- B32B 5/022: {Non-woven fabric}
- B32B 27/42: comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
- B32B 2305/026: Porous
- B32B 2363/00: Epoxy resins
- Y10S 384/913: Metallic compounds
- Y10T 442/671: Multiple nonwoven fabric layers composed of the same polymeric strand or fiber material
- Y10T 442/673: Including particulate material other than fiber
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A light weight, high temperature, laminate is made of a plurality of heat and pressure consolidated porous, interlocked, needle-punched, polyethylene terephthalate continuous filament mats, impregnated with a thermoset resin to a treated ratio of from about 2 to about 5.

## Claims

### Claim 1

A high temperature lubricating laminate rub strip comprising a plurality of heat and pressure consolidated resin impregnated mats, each resin impregnated mat comprising a porous, non-woven, interlocked, polyethylene terephthalate filament mass, impregnated with a thermoset resin to a treated ratio of from about 2 to about 5.

### Claim 2 (depends on 1)

The laminate of claim 1, where the mat is needle-punched, and the filament melting point is between about 200.degree. C. and about 260.degree. C.

### Claim 3 (depends on 1)

The laminate of claim 1, where the mat is over about 75% porous, and is impregnated with a resin selected from the group consisting of phenolic resin, silicone resin, melamine resin, epoxy resin and polyester resin.

### Claim 4 (depends on 1)

The laminate of claim 1, where the impregnating resin also contains filler particles.

### Claim 5 (depends on 1)

The laminate of claim 1, where the impregnating resin also contains filler particles selected from the group consisting of aluminum silicate, calcium carbonate, mica, aluminum trihydrate, talc, and mixtures thereof, the filler being added up to about 60 wt.% of the filler plus resin solids weight.

### Claim 6 (depends on 1)

The laminate of claim 1, where the mat is between about 75% and 95% porous, contains continuous filaments, where the filament melting point is between about 200.degree. C. and about 260.degree. C., and is impregnated with phenolic resin.

### Claim 7 (depends on 1)

The laminate of claim 1, as a rub strip in an oven operating at a temperature of between about 150.degree. C. and 200.degree. C.

### Claim 8 (depends on 1)

The laminate of claim 1, as a chain rub strip in a forced air textile drying oven operating at a temperature of between about 150.degree. C. and 200.degree. C.

### Claim 9

A lubricating rub strip suitable for frictional contact with a metal at a temperature up to about 200.degree. C., said rub strip comprising a heat and pressure consolidated laminate of a plurality of resin impregnated mats, each resin impregnated mat comprising a sheet of porous, interlocked, continuous polyethylene terephthalate filaments, impregnated with a thermoset resin to a treated ratio of from about 2 to about 5.

### Claim 10 (depends on 9)

The rub strip laminate of claim 9, where the sheet is non-woven and needle-punched, and comprises binder free randomly distributed continuous filaments of polyethylene terephthalate where the filament melting point is between about 200.degree. C. and about 260.degree. C., the sheet is over about 75% porous, and is impregnated with a resin selected from the group consisting of phenolic resin, silicone resin, melamine resin, epoxy resin and polyester resin.