Silicone-containing polymers, compositions and improved oxygen p

Details Silicone-containing polymers, compositions and improved oxygen p Silicone-containing polymers, compositions and improved oxygen p

1992-04-09

1994-05-24

Dean, Ralph H.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525281, 525288, 525299, 525301, 525303, C08F27102, C08F29300, C08F27500

Patent

active

053149610

ABSTRACT:
The present invention relates to novel copolymers and contact lenses made from these copolymers comprising preformed silicone-containing acrylic star polymers, graft copolymers and macromonomers, preparation of these contact lenses and a therapeutic method for treating patients with visual impairment.
Described is a composition comprising at least about 10% by weight of a preformed silicone-containing acrylic copolymer and no more than about 90% by weight of a matrix formed from the random polymerization of a mixture of monomers. The mixture of monomers comprises at least one hydrophilic monomer and at least about 5% by weight of a polysiloxanylalkylester of an alpha, beta unsaturated acid and optionally, monomers selected from the group consisting of esters of alpha, beta-unsaturated acids and crosslinking monomers. The preformed silicone-containing acrylic copolymer is preferably copolymerized throughout the matrix. The final compositions are hydrated to a final water content of at least about 10% by weight.

REFERENCES:
patent: 5019628 (1991-05-01), Spinelli et al.
patent: 5057576 (1991-10-01), Spinelli et al.
patent: 5057578 (1991-10-01), Spinelli et al.

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