Organopolysiloxane compositions having pressure-sensitive adhesive properties

Claim 1

THE SILOXANE PRODUCT OF INTERCONDENSATION AT A TEMPERATURE OF FROM ABOUT 100* TO 150*C. OF A MIXTURE OF INGREDIENTS COMPOSED ESSENTIALLY, BY WEIGHT, OF (1) ONE PLART OF A COHYDROLYSIS PRODUCT OF A MIXTURE OF INGREDIENTS CONSISTING ESSENTIALLY OF (A) A TRIALKYL HYDROLYZABLE SILANE WHEREIN THE FOURTH VALENCE OF THE SILICON ATOM IS ATTACHED DIRECTLY TO A HYDROLYZABLE GROUP AND (B) AN ALKYL SILICATE, THE ALKYL GROUPS OF THE SILANE AND SILICATE CONTAINING AT MOST FOUR CARBON ATOMS AND SAID COHYDROLYSIS PRODUCT CONTAINING A PLURALITY OF SILICON-BONDED HYDROXYL GROUPS, THERE BEING EMPLOYED A MOLAR RATIO OF FROM 1 TO 2 MOLS OF THE ALKYL SILICATE PER MOL OF TRIALKYL HYDROLYZABLE SILANE, AND (2) FROM 0.5 TO 6 PARTS OF A LINEAR HIGH VISCOSITY ORGANOPOLYSILOXANE FLUID OF ABOVE 200,000 CENTIPOISES VISCOSITY AND CONTAINING TERMINAL SILICON-BONDED HYDROXYL GROUPS, THE ORGANIC GROUPS BEING ATTACHED TO SILICON BY CARBON-SILICON LIKAGES AND BEING SELECTED FROM THE CLASS CONSISTING OF MONOVALENT HYDROCARBON RADICALS AND HALOGENATED ARYL RADICALS, THERE BEING PRESENT AN AVERAGE OF ABOUT TWO ORGANIC GROUPS PER SILICON ATOM IN THE ORGANOPOLYSILOXANE FLUID, SAID INTERCONDENSATION PROCEEDING THROUGH THE MEDIUM OF THE SILICON-BONDED HYDROXYL GROUPS OF (1) AND (2).