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US 6,492,478 B1Granted
Polymers with crosslinkable pendent groups
AssigneeNovartis AG
InventorBettina Steinmann
Life of this patent
Estimating the term…
Abstract
The invention relates to novel crosslinkable prepolymers comprising structural units of the formula wherein the variables are as defined in the claims, to crosslinked polymers, to either homo-polymers or copolymers prepared from those novel prepolymers, to mouldings produced from the said homo- or co-polymers, and especially to contact lenses produced from those homo- or co-polymers.
Claims17
A prepolymer which is a linear polyester having pendent crosslinkable groups of the formula —CH2—R and comprising structural units of the formula
- Z is straight-chained or branched C1-C12alkylene or unsubstituted or C1-C4alkyl- or C1-C4alkoxy-substituted phenylene or C7-C12aralkylene,
- x and t are each independently of the other the number 0 or 1,
- R5 is hydrogen, C1-C4alkyl or halogen,
- R6 is hydrogen, C1-C4alkyl, phenyl, carboxy or halogen,
- R7 is hydrogen when R6 is phenyl or carboxy, or is hydrogen or carboxy when R6 is hydrogen, C1-C4alkyl or halogen,
- R8 is a C2-C12alkylene radical, a phenylene radical or a C7-C12aralkylene radical,
- R9 and R9′ are each independently of the other hydrogen, C1-C4alkyl or halogen,
- R1 is a radical of the formula
- —[CH2—CHR″—O]n—CH2—CHR″— (3a) or
- —[CH2—CH2—CH2—CH2—O]n—CH2—CH2—CH2—CH2 (3b);
- or an alkylene radical having up to 20 carbon atoms which may be interrupted by one or more ester, urethane or ureido groups and/or may be substituted by hydroxy;
- or a cycloalkylene radical having from 6 to 20 carbon atoms;
- or an arylene radical having from 6 to 20 carbon atoms;
- or an arylenealkylene, alkylenearylene, alkylenearylenealkylene or arylenealkylenearylene radical,
- R2 is a radical of the formula
- —CH2[CH2—CHR*—O]p—CH2— (4) or
- R3—C(O)—[O—CHR*—CH2]p—O—(O)C—R3— (5);
- or an alkylene radical having up to 20 carbon atoms which may be interrupted by one or more ester, urethane or ureido groups and/or may be substituted by hydroxy;
- or a cycloalkylene radical having from 6 to 20 carbon atoms;
- or an arylene radical having from 6 to 20 carbon atoms;
- or an arylenealkylene, alkylenearylene, alkylenearylenealkylene or arylenealkylenearylene radical,
- R′, R″ and R* are each independently of the others hydrogen or C1-C4alkyl,
- R3 is an alkylene radical having up to 20 carbon atoms;
- or a cycloalkylene radical having from 6 to 20 carbon atoms;
- or an arylene radical having from 6 to 20 carbon atoms, and n, m, p and q are each independently of the others a number from 1 to 30,
- with the proviso that at least one of the radicals R1 and R2 is a radical of formula (3a), (3b), (4) or (5).
23 more elements
Dependencies are inferred from the claim text.