Process for producing elastomers from hetero-disperse systems by

Details Process for producing elastomers from hetero-disperse systems by Process for producing elastomers from hetero-disperse systems by

1979-02-28

1980-09-30

Lieberman, Paul

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

Synthetic resins

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

525130, C08L 7500

Patent

active

042256836

ABSTRACT:
Process for producing elastomer materials which are abrasion resistant in the heat, based on polyurethanes and polyoxides, by reacting aliphatic or aromatic diisocyanates, low molecular polydiols or polydiamines and hydroxyl-containing polyesters or polyethers with a molecular weight between 800 and 5000, especially between 2000 and 3000, in equimolar quantities and in liquid phase, characterized by performing the reaction in the presence of rubber powder having diene units incorporated therein, the powder being dispersed in the reaction mass in an amount of 20%-50% by weight, the reaction being carried out in the presence of sulfur or a peroxide, and the rubber powder having a particle size between 5 and 500.mu., the polyurethane reaction mass having a surplus of double bonds capable of cross-linking and casting the elastomer so produced from the liquid mass into molds. Tires made from the elastomers according to the invention are of excellent properties in their tread surfaces.

REFERENCES:
patent: 3663469 (1972-05-01), Weissmahr
patent: 3755241 (1973-08-01), Brady
patent: 3806558 (1974-04-01), Fischer
patent: 3846163 (1974-11-01), Kest
patent: 3909466 (1975-09-01), Matsui
patent: 3980595 (1976-09-01), Schonfeld

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