Foamed rubber extruded product

Details Foamed rubber extruded product Foamed rubber extruded product

1998-11-06

2000-10-17

Copenheaver, Blaine

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

264 54, 428339, 521 81, 521140, 521150, C08J 906, C08K 904, C08L 2316

Patent

active

061328472

ABSTRACT:
A formed rubber extruded product which is formed of a vulcanizate of a rubber blend comprising a sulfur-vulcanizable ethylene-propylene-type rubber (EPDM) as a starting rubber and a pyrolytic foaming agent. The vulcanizate has a specific gravity of from 0.9 to 1.0 and a surface roughness (RZD) of 14 micrometers or less. The rubber blend contains the pyrolytic foaming agent in the form of an inorganic powder-supported foaming agent. A particle diameter of the inorganic powder in the inorganic powder-supported foaming agent is approximately 9 micrometers or less, and a particle diameter of the pyrolytic foaming agent is approximately 8 micrometers or less. Further, crystalline PE is contained in an amount of from 6 to 30 parts per 100 parts of EPDM. The foamed rubber extruded product of the present invention can be produced by the extrusion at a high rate.

REFERENCES:
patent: 4866101 (1989-09-01), Iwasa et al.
patent: 5766703 (1998-06-01), Mori et al.

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