Photocrosslinked polymers

Details Photocrosslinked polymers Photocrosslinked polymers

1995-06-05

1996-12-10

Szekely, Peter A.

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

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522154, 523106, 523108, 525 58, 525 59, 525 60, 525 61, C08F 248, C08F21638, C08J 718, C08J 500

Patent

active

055831630

ABSTRACT:
The invention relates to a novel process for the manufacture of mouldings, especially contact lenses, in which a soluble prepolymer comprising crosslinkable groups is cross-linked in solution, and also to mouldings, especially contact lenses, obtainable in accordance with that process. The present invention relates also to novel prepolymers that can be used in the process according to the invention, especially derivatives of a polyvinyl alcohol having a molecular weight of at least about 2000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprise from approximately 0.5 to approximately 80% of units of formula I ##STR1## wherein R is lower alkylene having up to 8 carbon atoms,

REFERENCES:
patent: 4598122 (1986-07-01), Goldenberg
patent: 4663410 (1987-05-01), Pinschmidt
patent: 4670506 (1987-06-01), Goldenberg et al.
patent: 4691026 (1987-09-01), Pinschmidt, Jr.
patent: 4788288 (1988-11-01), Pinschmidt, Jr.
patent: 4864055 (1989-09-01), Pinschmidt
patent: 5326669 (1994-07-01), Curtis
patent: 5332651 (1994-07-01), Dickinson et al.
patent: 5360864 (1994-11-01), Curtis
Optical or Electron Radiation Crosslinking Type Resin Composition, vol. 11 No. 398(C-466)(2345) Dec. 25, 1987.
Photosensitive Resin, vol. 12 No. 312(C-523)(3159) Aug. 24, 1988.

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