Hydrophilic polymers and contact lenses therefrom

Details Hydrophilic polymers and contact lenses therefrom Hydrophilic polymers and contact lenses therefrom

1982-02-04

1984-08-14

Wong, Jr., Harry

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

Synthetic resins

Processes of preparing a desired or intentional composition...

351160H, C08L 3314

Patent

active

044657943

ABSTRACT:
There is 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 80 to 80 weight % of water. The polymers are particularly useful in preparing hydrophilic contact lenses of high burst strength and extended wear properties.

REFERENCES:
patent: 3965063 (1976-06-01), Holcombe
patent: 4267295 (1981-05-01), Gallop et al.

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