Silicone for preparing ophthalmic devices

Details Silicone for preparing ophthalmic devices Silicone for preparing ophthalmic devices

2009-10-14

2011-11-08

Peng, Kuo-Liang (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

C526S279000

Reexamination Certificate

active

08053544

ABSTRACT:
The present invention is to provide a silicone having (meth)acryl groups on both ends of a molecule and represented by the formula (I):wherein R1is represented by the following formula:wherein n is 3 or 4, k is an integer of from 1 to 15, j is an integer of from 0 to 15, and Q2is a methyl group or a hydrogen atom;R2is, independently of each other, a group selected from the group consisting of hydrocarbon groups and halogenated hydrocarbon groups, both having 1 to 10 carbon atoms;R3is a group represented by the following formula:in-line-formulae description="In-line Formulae" end="lead"?—CmH2mO(C2H4O)x(C3H6O)yQ1in-line-formulae description="In-line Formulae" end="tail"?wherein m is 3 or 4, x is an integer of from 1 to 15, y is an integer of from 0 to 15, and Q1is a methyl group or a hydrogen atom;a is an integer of from 1 to 500; andb is an integer of from 1 to 100, with a total of a and b being 50 to 500.

REFERENCES:
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patent: 4260725 (1981-04-01), Keogh et al.
patent: 2002/0016383 (2002-02-01), Iwata et al.
patent: 0885932 (1998-12-01), None
patent: 62-29776 (1987-02-01), None
European Search Report dated Jul. 29, 2011, in European Application No. 09172231.4-1214.

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