Heat-shrinkable and flame-retardant silicone rubber compositions

Abstract

Abstract HEAT-SHRINKABLE AND FLAME-RETARDANT SILICONE RUBBER COMPOSITIONS COMPRISING: (1) 100 PARTS BY WEIGHT OF A DIORGANOPOLYSILOXANE GUM CONSISTING OF 99.7 MOL PERCENT DIMETHYLSILOXY UNIT AND 0.3 MOL PERCENT METHYLVINYLSILOXY UNIT; (2) 43 PARTS BY WEIGH OF FUME SILICA; (3) 25 PARTS BY WEIGHT OF AN ORGANOPOLYSILOXANE RESIN CONSISTING OF 37 MOLE PERCENT PHENYLSILOXY UNIT, 25 MOL PERCENT METHYLSILOXY UNIT, 19 MOL PERCENT DIPHENYLSILOXY UNIT, 17 MOL PERCENT DIMETHYLSILOXY UNIT AND 2.0 MOL PERCENT METHYLVINYLSILOXY UNIT, AND HAVING A SOFTENING POINT OF 84-89* C.; 4) 1 PART BY WEIGHT OF TRIMETHYLSILYL END-STOPPED METHYL-HYDROGEN POLYSILOXANE; AND (5) CATALYTIC AMOUNT OF CHLOROPLATINIC ACID. THESE COMPOSITIONS ARE MOLDED INTO VARIOUS SHAPES ANDD CURED. THE MOLDED AND CURED ARTICLES ARE STRETCHED AT A CERTAIN TEMPERATURE AND THEN COOLED TO ROOM TEMPERATURE IN THEIR STRETCHED CONDITION. THE RESULTING ARTILCES HAVE SUCH PROPERTIES AS DISTINGUISHED IN HEAT-SHRINKAGE, FLAME-RETARDANCY, MEACHANICAL STRENGTH, WATER PROFFNESS, AND ELECTRICAL PROPERTIES.

Inventors

• 👤 K Yokokawa
• 👤 Y Tanaka

Bibliographic Details