C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/6419
C08L 21/00 (2006.01) C08J 3/00 (2006.01) C08L 27/12 (2006.01) C08L 27/18 (2006.01)
Patent
CA 1243438
TITLE IMPROVED ELASTOMERIC COMPOSITIONS ABSTRACT OF THE DISCLOSURE 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 m2/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.
468746
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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