Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1980-12-15
1982-05-04
Wong, Jr., Harry
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
523106, 523113, 524813, C08L 3314
Patent
active
043281486
ABSTRACT:
There is a prepared a hydrophilic water swellable, water insoluble copolymer of (1) at least 35% of a hydroxy (C.sub.2 -C.sub.4 -alkyl)-2-alkenoate, (2) 30 to 60% of a 2-alkenamide or an N, N-di (C.sub.1 -C.sub.6 -alkyl)2-alkenamide, (3) 5 to 20% of R --OR.sub.1 --.sub.x Z where R is C.sub.1 -C.sub.6 alkyl, R.sub.1 is C.sub.2 -C.sub.4 alkylene, x is an integer of 1 to 4 and Z is 2-alkenoyloxy and (4) 0.3 to 5% of a polyethylenically unsaturated crosslinking agent having a relatively long aliphatic chain, the copolymer being capable of holding 50 to 80 weight % of water. The polymers are particularly useful in preparing hydrophilic contact lenses of high burst strength and extended wear properties.
REFERENCES:
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patent: 3985697 (1976-10-01), Urbach
patent: 4022754 (1977-05-01), Gordon et al.
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patent: 4113686 (1978-09-01), Holcombe
patent: 4123407 (1978-10-01), Gordon
patent: 4123408 (1978-10-01), Gordon
patent: 4180308 (1979-12-01), Mancini et al.
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