Dow Corning Corporation

Earl W Beck

Sam A Brady

Schuyler B Smith

Silicone elastomer molds or tools are used to shape amine containing resins. If the mold is coated with a silane of the formula R.sub.a SiX.sub.4-a, where R is a monovalent halogenated hydrocarbon having 1 through 6 carbon atoms and the halogen selected from the group consisting of chlorine, bromine, and iodine, X is a monovalent radical that reacts with a hydroxyl radical on silicon, and a is 1 through 3, before use, the shrinkage of the mold with repeated use is decreased and the elastomeric mold or tool life is greatly extended.

Silicone mold and elastomer tool life

A silicone crumb in a fine particulate form has an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals. This crumb is made from a vinyl-containing polyorganosiloxane, a silicon-bonded hydrogen containing polysiloxane, and a platinum catalyst. The crumb is useful in hydraulic applications.

Hydraulic silicone crumb

Mixing under low shear vinyl-containing polyorganosiloxane, a silicon-bonded hydrogen polysiloxane and a platinum catalyst, and continue mixing produces a crumb which has an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals. The crumb is useful in hydraulic applications.

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Dublin, CA, United States of America

Earl W Beck