Elastomeric compositions

Details Elastomeric compositions Elastomeric compositions

1984-12-04

1986-06-24

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525192, 525193, 525194, 525195, 525196, 525200, 5253262, 525366, 525367, C08L 2722, C08L 2716, C08L 2718

Patent

active

045968551

ABSTRACT:
An elastomeric composition comprising an elastomer matrix having dispersed therein about 3-30 parts per 100 parts by weight of the elastomer of powdered polytetrafluoroethylene having a number average molecular weight of at least about 250,000 and a surface area of at least 1 m.sup.2 /g which has been treated with about 50-120% of sodium-naphthalene addition compound or another addition compound of an alkali metal required for the alkali metal to react with all the fluorine atoms on the surface of the polytetrafluoroethylene powder.
By dispersing such treated polytetrafluoroethylene powder in elastomer matrix, one increases significantly the tear strength of the elastomer, while increasing its modulus only moderately. In this way, the processability of the elastomeric compositions is not adversely affected.

REFERENCES:
patent: 2710290 (1955-06-01), Safford et al.
patent: 2871144 (1959-01-01), Doban
patent: 3940455 (1976-02-01), Kaufman
patent: 4326046 (1982-04-01), Miyaka et al.
patent: 4507439 (1985-03-01), Stewart
A. A. Benderly, Treatment of Teflon to Promote Bondability, J. Appl. Polymer Science VI, 20, 221-225, (1963).

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