Spongeable polysiloxane composition and process of producing sponge therefrom

Claim 1

THE PROCESS OF PRODUCING AN ORGANOPOLYSILOXANE SPONGE CHARACTERIZED BY AN ENHANCED VOLUME INCREASE AND DESIRABLE PHYSICAL CHARACTERISTICS WHICH COMPRISES ADDING TO A CONVERTIBLE ORGANOPOLYSILOXANE CONTAINING FROM ABOUT 1.98 TO 2.05 ORGANIC GROUPS PER SILICON ATOM, AT LEAST 80% OF SAID ORGANIC GROUPS BEING METHYL GROUPS, ANY OTHER ORGANIC GROUPS PRESENT IN THE AFORESAID ORGANOPOLYSILOXANE BEING SELECTED FROM THE CLASS CONSISTING OF OTHER LOWER ALKYL GROUPS, ARYL GROUPS, HALOGENATED ARYL GROUPS, AND MIXTURES THEREOF, SAID ORGANOPOLYSILOXANE CONTAINING SILICA FILLER, AND CONTAINING AS A CURING AGENT FROM 2% TO 4%, BY WEIGHT, BASED ON THE FILLED ORGANOPOLYSILOXANE OF A MIXTURE COMPRISING FROM ABOUT 65% TO 90%, BY WEIGHT, OF TERTIARY BUTYL PERBENZOATE AND FROM 35% TO 4%, BY WEIGHT, OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF BENZOYL PEROXIDE, BIS-(2,4-DICHLOROBENZOYL) PEROXIDE AND MIXTURES THEREOF AND FROM 2% TO 6%, BY WEIGHT BASED ON THE WEIGHT OF THE FILLED ORGANOPOLYSILOXANE PLUS CURING AGENT, OF A BLOWING AGENT SELECTED FROM THE GROUP CONSISTING OF DINITROSOPENTAMETHYLENETETRAMINE AND N,N''-DIMETHYL N,N''-DINITROSOTEREPHTHALAMIDE, AND HEATING SAID MIXTURE TO EXPAND AND CURE SAID ORGANOPOLYSILOXANE.