Patent ID: 7132493
Filing Date: 2006-11-07
Classification: A61L,C08F,C08G,C08L,G02B,Y10S

Abstract:
1. A method of producing prepolymer precursors wherein the R groups may be the same or different saturated C 1-10 hydrocarbon substituents; the R 1 groups may be the same or different C 1-10 alkyl substituents; the R 2 groups may be the same or different selected from the group consisting of C 1-10 alkyl substituents, C 1-10 fluoroalkyl substituents, and C 2-20 alkyl-fluoroalkyl substituents; the R 3 groups may be the same or different C 6-30 aromatic substituents; n is a natural number; and m is a natural number greater than 4 representing the sum of siloxane moieties with randomly differing R 1 , R 2 and R 3 groups as defined above so as to have a molar ratio of aromatic substituents to alkyl substituents no less than 1:4 such that the prepolymer molecular weight is at least approximately 1000 and refractive index is at least approximately 1.45; and the Z 1 groups may be the same or different selected from the group consisting of —OH and —NH 2 , comprising: reacting 1,3-bis-hydroxyalkyl polysiloxane or 1,3-bis-aminoalkyl polysiloxane with at least one silane selected from the group consisting of dimethyldimethoxysilane, diphenyldimethoxysilane and methylphenyldimethoxysilane.