Compositions comprising diisocyanatelinked elastomers and silicon dioxide

Claim 1

A COMPOSITION OF MATTER COMPRISING (A) 100 WEIGHT PARTS OF A POLYURETHANE ELASTOMER PREPARED BY REACTING (1) A MATERIAL SELECTED FROM THE CLASS CONSISTING OF: (A) POLYESTERS PREPARED BY THE CONDENSATION REACTION BETWEEN A DIBASIC ALIPHATIC ACID AND A MOLAR EXCESS OF A GLYCOL, (B) POLYESTERAMIDES PREPARED BY THE CONDENSATION REACTION BETWEEN A DIBASIC ALIPHATIC ACID AND A MOLAR EXCESS OF A MIXTURE MADE UP OF (I) AT LEAST 50% BY WEIGHT OF A GLYCOL AND (II) THE REMAINDER OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF AMINO ALCOHOLS AND ALIPHATIC DIAMINES, AND (C) POLYALKYLENE ETHER GLYCOLS WITH (2) AN AROMATIC DIISOCYANATE HAVING ISOCYANATE GROUPS AS THE SOLE REACTIVE GROUPS, THE MOLAR PROPORTIONN OF (2) BEING AT LEAST EQUIVALENT TO THAT OF (1) AND (B) FROM ABOUT 5 TO 50 WEIGHT PARTS OF FIBROUS PARTICLES OF SILICON DIOXIDE, SAID PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF FROM ABOUT 50 TO 600 MILLIMICRONS, A SURFACE AREA OF ABOUT 60 TO 200 SQUARE METERS PER GRAM, AND A RATIO OF WIDTH TO LENGHT OF FROM ABOUT 1:10 TO 1:50.