Organopolysiloxane compositions incorporating heat-age resistant rare earth compounds

Claim 1

ORGANOPOLYSILOXANE COMPOSITIONS COMPRISING (1) AN ORGANOPOLYSILOXANE, (2) A FILLER, AND (3) A RARE EARTH MATERIAL IN AN AMOUNT EFFECTIVE FOR STABILIZATION OF SAID ORGANOPOLYSILOXANE COMPRISING A MIXTURE OF COMPOUNDS SELECTED FROM THE CLASS CONSITING OF OCTOATES, CHLORIDES, ACETATES, OXALATES, FLUORIDES, SULPHATES, NITRATE, NAPHTHENATES, AND OXIDES OF RARE EARTH METALS CONSISTIG ESSENTIALLY OF CERIUM, LANTHANUM, NEODYMIUM, PRASEODYMIUM, SAMARIUM GADOLINIUM, AND YTTRIUM, WHERE EACH OF SAID RARE EARTH METALS HAS A WEIGHT PERCENT IN SAID MIXTURE WHICH IS APPROXIMATELY PROPORTIONAL TO ITS WEIGHT PERCENT IN MONAZITE ORE, SAID ORGANOPOLYSILOXANE HAVING A VISCOSITY OF AT LEAST 100,000 CENTIPOISES WHEN MEASURED AT 25*C., THE GROUP ORGANO RADICALS OF SAID ORGANOPOLYSILOXANE BEING MEMBERS SELECTED FROM THE CLASS CNSISTING OF MONOVALENT HYDROCARBON RADICALS, HALOGENATED MONOVALENT HYDROCARBON RADICALS, AND CYANOALKYL RADICALS, THERE BEING AN AVERAGE OF ABOUT 1.98 TO 2.01 ORGANO RADICALS PER SILICON ATOM.