Title: Polymers based on block copolymers
Application Number: 95197442 Application Date: 1995.12.27
Publication Number: 1173227 Publication Date: 1998.02.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C08F2/50;C08F290/04;G02B1/04;G03F7/031
Applicant(s) Name: Ciba-Geigy AG. Address:
Inventor(s) Name: P. Chabrecek;D. Lohmann;K. Dietliker
Attorney & Agent: HUANG ZEXIONG
Abstract:
    The invention relates to crosslinked polymers, which are polymerisation products of a polymerisable mixture that comprises the following components: a) a macromer of formula C wherein Macro is an m-valent radical of a macromer from which the number m of groups Rx-H has been removed, each Rx, independently of the others, is a bond, -O-, -NRN- or -S- wherein RN is hydrogen or lower alkyl, PI* is a bivalent radical of a photoinitiator, Raa is the moiety of a photoinitiator that forms the less reactive free radical on cleavage of the photoinitiator, and m is an integer from 1 to 100, b) a copolymerisable vinyl monomer and c) a copolymerisable crosslinker. The polymers are suitable especially for the production of mouldings, such as for contact lenses.
Time: 4
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