Claims
- 1. A biomedical moulding produced by photocrosslinking a prepolymer that is a derivative of a polyvinyl alcohol having a molecular weight of at least about 2,000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprises from approximately 0.5 to approximately 80% of units of formula I wherein:R is lower alkylene having up to 8 carbon atoms, R1 is hydrogen or lower alkyl, and R2 is an unsaturated, electron-attracting copolymerizable radical having up to 25 carbon atoms.
- 2. The moulding of claim 1 wherein R2 is an olefinically unsaturated acyl radical of formula R3—CO—, in which R3 is an olefinically unsaturated copolymerizable radical having from 2 to 24 carbon atoms.
- 3. The moulding of claim 2 wherein R3 is alkenyl having from 2 to 8 carbon atoms.
- 4. The moulding of claim 1 wherein the radical R2 is a radical of formula II—CO—NH—(R4—NH—CO—O)q—R5—O—CO—R3 (II) whereinq is 0 or 1, R4 and R5 are independently lower alkylene having 2 to 8 carbon atoms, arylene having from 6 to 12 carbon atoms, a saturated divalent cyclaliphatic group having from 6 to 10 carbon atoms, arylenealkylene or alkylenearylene having from 7 to 14 carbon atoms or arylenealkylenearylene having 13 to 16 carbon atoms, and R3 is an olefinically unsaturated copolymerizable radical having from 2 to 24 carbon atoms.
- 5. The moulding of claim 1 wherein said moulding comprises from approximately 0.5 to approximately 80% of units of formula III wherein:R is lower alkylene having up to 8 carbon atoms, R1 is hydrogen or lower alkyl, p is 0 or 1, q is 0 or 1, R3 is an olefinically unsaturated copolymerizable radical having form 2 to 8 carbon atoms, and R4 and R5 are independently lower alkylene having 2 to 8 carbon atoms, arylene having from 6 to 12 carbon atoms, a saturated divalent cyclaliphatic group having from 6 to 10 carbon atoms, arylenealkylene or alkylenearylene having from 7 to 14 carbon atoms or arylenealkylenearylene having 13 to 16 carbon atoms.
- 6. The moulding of claim 5 wherein R is a lower alkylene having up to 6 carbon atoms and p is 0 and R3 is alkenyl having from 2 to 8 carbon atoms.
- 7. The moulding of claim 5 wherein R is a lower alkylene having up to 6 carbon atoms, p is 1, q is 0, R5 is lower alkylene having from 2 to 6 carbon atoms and R3 is alkenyl having from 2 to 8 carbon atoms.
- 8. The moulding of claim 5 wherein R is a lower alkylene having up to 6 carbon atoms; p is 1; q is 1; R4 is lower alkylene having from 2 to 6 carbon atoms, phenylene, unsubstituted or substituted by lower alkyl, cyclohexylene or cyclohexylene-lower alkylene, unsubstituted or substituted lower alkyl, phenylene-lower alkylene, lower alkylene-phenylene or phenylene-lower alkylene-phenylene; R5 is lower alkylene having from 2 to 6 carbon atoms and R3 is alkenyl having from 2 to 8 carbon atoms.
- 9. The moulding of claim 5 is an ophthalmic moulding.
- 10. A membrane produced by photocrosslinking a prepolymer that is a derivative of a polyvinyl alcohol having a molecular weight of at least about 2,000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprises from approximately 0.5 to approximately 80% of units of formula I wherein:R is lower alkylene having up to 8 carbon atoms, R1 is hydrogen or lower alkyl, and R2 is an unsaturated, electron-attracting copolymerizable radical having up to 25 carbon atoms.
- 11. A photoresist material comprising a prepolymer that is a derivative of a polyvinyl alcohol having a molecular weight of at least about 2,000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprises from approximately 0.5 to approximately 80% of units of formula I wherein:R is lower alkylene having up to 8 carbon atoms, R1 is hydrogen or lower alkyl, and R2 is an unsaturated, electron-attracting copolymerizable radical having up to 25 carbon atoms.
Parent Case Info
This application is a division of U.S. application Ser. No. 08/687,437, filed Jul. 3, 1996, now U.S. Pat. No. 5,849,810, which is a division of U.S. application Ser. No. 08/575,799, filed Dec. 22, 1995, now U.S. Pat. No. 5,789,464, which is a continuation of U.S. application Ser. No. 08/286,035, filed Aug. 4, 1994, now U.S. Pat. No. 5,508,317.
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Continuations (1)
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Number |
Date |
Country |
Parent |
08/286035 |
Aug 1994 |
US |
Child |
08/575799 |
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US |