Patent ID: 7098288
Filing Date: 2006-08-29
Classification: C07F,C08G,C08L,C09D,G02B

Abstract:
1. A method of manufacturing a prepolymer having a formula of wherein the V groups are the same or different unsaturated photo or thermal polymerizable substituents of the general structure R 3 CH═C(R 4 )(CH 2 ) p (W) q (Z) q (Ar) q R 5 ; the R groups are the same or different saturated C 1-10 hydrocarbon substituents; the R 1 groups are the same or different C 1-10 alkyl substituents; the R 2 groups are the same or different and are selected from the group consisting of C 1-10 alkyl substituents, C 1-10 fluoroalkyl substituents, C 2-20 alkyl-fluoroalkyl substituents and C 6-30 aromatic substituents; the L groups, which are absent or present, where present are the same or different urethane, urea, or ester linkages; y is a natural number greater than 4 representing the sum of siloxane moieties with randomly differing R 2 groups as defined above so as to have a molar ratio of aromatic substituents to alkyl substituents no less than 1:4; x is a natural number such that the prepolymer molecular weight is at least approximately 1000 and refractive index is at least approximately 1.45; R 3 is selected from the group consisting of hydrogen, C 1-10 alkyl and —CO—U; R 4 is selected from the group consisting of hydrogen and methyl; R 5 is a C 1-10 divalent alkylene radical; the W group is selected from the group consisting of —CO— and —OCO—; the Z group is selected from the group consisting of —O— and —NH—; the Ar groups may be the same or different C 6-30 aromatic radicals; p is a non-negative integer less than 7; q is either 0 or 1; and U is selected from the group consisting of —OC 1-12 alkyl radical, —SC 1-12 alkyl radical and —NHC 1-12 alkyl radical, with the proviso that if W is a —OCO— group, Z is an —NH— group, the method comprising: reacting a hydroxyalkyl-terminated polysiloxane with a diisocyanate, a diacidchloride or phosgene; and end-capping with a hydroxy or amino containing monomer.