Copolymers comprising propellanes and contact lenses made theref

Details Copolymers comprising propellanes and contact lenses made theref Copolymers comprising propellanes and contact lenses made theref

1992-10-14

1994-11-08

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523107, 523108, 524553, 524846, 526282, 351160R, C08F21000, G02B 104, C08G 6106

Patent

active

053627679

ABSTRACT:
The invention relates to contact lenses made from a copolymer comprising units of formula I ##STR1## wherein R.sup.1 and R.sup.2 are each independently of the other hydrogen, alkyl, alkoxyalkyl, organosilylalkyl or organosilyl, R.sup.3 and R.sup.4 are each hydrogen or, taken together, are a divalent alkylene radical containing up to 8 carbon atoms, and A is a divalent substituted 1,2-ethylene radical which is derived from a copolymerisable vinyl monomer by virtue of the vinyl double bond being replaced with a single bond. The invention further relates to the copolymers themselves, to the use thereof for making contact lenses, and to a process for making contact lenses from such copolymers.

REFERENCES:
Schluter et al., Makromoleculare Chemie, 192, (1991), pp. 2497-2519.

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