Patent ID: 6280749
Filing Date: 2001-08-28
Classification: A61K,A61Q,C08L

Abstract:
A cured fluorosilicone rubber in the form of particles having an average diameter in the range from 0.1 to 100 .mu.m and a rubber hardness in the range from 5 to 90 in the JIS A scale, the fluorosilicone rubber having a composition consisting of the first type units of the unit formula [R.sup.1 R.sup.2 SiO.sub.2/2 ], second type units of the unit formula [R.sup.2.sub.2 SiO.sub.2/2 ] and third type units of the unit formula [R.sup.2.sub.3 SiO.sub.1/2 ], in which R.sup.1 is a perfluoroalkyl-substituted alkyl group represented by the general formula R.sup.f (CH.sub.2).sub.a --, R.sup.f being a perfluoroalkyl group having 1 to 20 carbon atoms and the subscript a being a positive integer not exceeding 6, and R.sup.2 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 20 carbon atoms, in such a proportion that the molar ratio of R.sup.1 :(R.sup.1 +R.sup.2) is in the range from 0.05 to 0.5.