Low temperature, solvent resistant dimethyl organosiloxane elastomers containing pendant ethyl groups and unsaturated hydrocarbon groups

Claim 1

A COMPOSITION OF MATTER CURABLE TO A SILOXANE ELASTOMER WHICH COMPRISES (1) 100 PARTS BY WEIGHT OF A COPOLYMERIC DIHYDROCARBONPOLYSILOXANE GUM HAVING A HYDROCARBON SUBSTITUENT TO SILICON ATOM RATIO OF FROM 1.95 TO 2.05 AND WHOSE HYDROCARBON SUBSTITUENTS COMPRISE SATURATED HYDROCARBON GROUPS SELECTED FROM THE CLASS CONSISTING OF METHYL AND ETHYL GROUPS AND OLEFINICALLY UNSATURATED HYDROCARBON GROUPS SELECTED FROM THE CLASS CONSISTING OF VINYL, ALLYL AND CYCLOHEXENYL GROUPS AND WHEREIN FROM 4.0 TO 6.03 MOLE PERCENT OF THE TOTAL NUMBER OF HYDROCARBON GROUPS ARE ETHYL GROUPS, FROM 0.0185 TO 0.5 MOLE PERCENT OF THE TOTAL NUMBER OF HYDROCARBON GROUPS ARE OLEFINICALLY UNSATURATED GROUPS AND THE REMAINDER BEING METHYL GROUPS, (2) FROM 10 TO 80 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF COPOLYMERIC DIHYDROCARBONPOLYSILOXANE GUM OF A FINELY DIVIDED SILICA FILLER, (3) A STABILIZING AMOUNT OF A HEAT STABILIZER SELECTED FROM THE CLASS CONSISTING OF FERRIC OXIDE, FERRIC OCTOATE, FERRIC 2-ETHYL HEXOATE, FINELY DIVIDED CUPRIC ACETATE, A MIXTURE OF FINELY DIVIDED CUPRIC ACETATE AND FERRIC OCTOATE, AND A MIXTURE OF FINELY DIVIDED CUPRIC ACETATE AND FERRIC 2-ETHYL HEXOATE AND (4) AN ORGANIC PEROXIDE DIHYDROCARBONPOLYSILOXANE GUM CURING CATALYST.