Patent ID: 8735509

Claim:
A method of processing rubber, said method comprising: reacting said rubber with a polyorganosiloxane additive having 3 or more siloxane units, said polyorganosiloxane having one or more organic moieties R 1 , and having the following structure: [I D ] m [I M ] n [II D ] o [III M ] (2−n) , where (i) m is in the range from 0 to 40 and n is 1 or 2, (ii) o is in the range from 0 to 1000, (iii) the sum (m+o+2) is at least 3, (iv) [I D ] is the difunctional structural unit [R 1 RSiO 2/2 ] where R is a monovalent organic radical, (v) [I M ] is the monofunctional structural unit [R 1 R 2 SiO 1/2 ] where R is a monovalent organic radical, (vi) [II D ] is the difunctional structural unit [R′ 2 SiO 2/2 ] where the R′ radicals are the same or different and are each a methyl, an ethyl, a propyl or a phenyl, (vii) [III M ] is the monofunctional structural unit [R″ 3 SiO 1/2 ] where the R″ radicals are the same or different and are each selected from hydroxyl methyl, ethyl, propyl or phenyl, R 1 has one or more carbon-carbon multiple bonds and has at least 4 carbon atoms, and the presence of one or more hydrocarbon moieties having a chain length of 5 to 50 carbon atoms in the polyorganosiloxane is excluded, wherein the processing is a peroxidic vulcanization of said rubber, the amount of polyorganosiloxane used being 0.1 to 10 phr.