Room temperature curable organopolysiloxane compositions

Abstract

Abstract ORGANOPOLYSILOXANE COMPOSITIONS CURABLE AT ROOM TEMPERATURE AND CONSISTING OF: (1) 100 PARTS BY WEIGHT OF AN ORGANOPOLYSILOXANE HAVING A VISCOSITY OF FROM 10 TO 300,000CS. AT 25*C. AND REPRESENTED BY THE GENERAL FORMULA: CH2=CH-SI(-R2)-O-(SI(-R2)-O)N-SI(-R2)-CH=CH2 (WHERE R IS THE SAME OR A DIFFERENT KIND OF MONOVALENT HYDROCARBON RADICAL, FREE OF ALIPHATIC UNSATURATION, AND N IS AN INTEGER OF FROM 8 TO 1,500), (2) FROM 0 TO 100 PARTS BY WEIGHT OF AN ORGANOSILOXANE COPOLYMER COMPOSED OF: (A) SIO2 UNITS, (B) R3SIO0.5 UNITS AND (C) CH2=CH(R2)SIO0.5 UNITS, (WHERE R IS AS PREVIOUSLY DEFINED, AND THE MOLECULAR RATIO OF EACH OR THE UNITS IS (B+C)/A=0.3-3, AND C/A=0.01-1), (3) FROM 0.01 TO 200 PARTS BY WEIGHT OF AN ORGANOSILIXANE COPOLYMER WHOSE MAIN CHAIN IS COMPOSED EITHER OF (D) RR''SIO UNITS OR OF (D) RR''SIO UNITS AND (E) R''SIO1.5 UNITS, AND IS TERMINATED WITH R"(R2SIO0.5 UNITS, R"OSI(R''2)O0.5 UNITS, OR HOSI(R''2)O0.5, (WHERE R IS AS PREVIOUSLY DEFINED, AND AT LEAST 1 MOLE PERCENT OF R'' GROUP IS OF VINYL RADICALS, WITH THE REST BEING OF THE SAME OR DIFFERENT KIND OF MONOVALENT HYDROCARBONS, FREE OF ALIPHATIC UNSATURATION, AND R" IS EITHER SATURATED OR UNSATURATED MONOVALENT HYDROCARBON RADICALS, WHERE THE RATIO OF EACH OF THE UNITS IS E/(D+E)$0.5), (4) AN ORGANOHYDROGEN POLYSILOXANE IN WHICH THE TOTAL NUMBER OF SI-H BONDS IS FROM 50 TO 500 PERCENT OF THAT OF VINYL RADICALS CONTAINED IN COMPONENTS (1), (2) AND (3) GIVEN ABOVE AND WHICH CONTAINS AT LEAST THREE SI-H BONDS IN ONE MOLECULE, (5) FROM 1 TO 500 PARTS BY WEIGHT OF AN INORGANIC FILLER, AND (6) A CATALYTIC AMOUNT OF A PLATINUM COUMPOUND. SUCH COMPOSITIONS HAVE EXCELLENT PROCESSABILITY, BECAUSE THEY CAN BE CURED IN A DESIRED TIME. THEREFORE, THEY ARE VERY USEFUL AS POTTING OR MOLDING MATERIALS AS WELL AS COATING MATERIALS ON SUBSTRATES.

Inventors

• 👤 Tadashi Wada
• 👤 Kunio Itoh
• 👤 Kiyoshi Imai
• 👤 Hiroshi Inomata

Bibliographic Details