Contact lens composition having increased oxygen permeability

Details Contact lens composition having increased oxygen permeability Contact lens composition having increased oxygen permeability

1979-06-25

1981-01-20

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

351160H, C08F23008, G03B 2146

Patent

active

042463890

ABSTRACT:
Acrylic siloxanes having the formula: ##STR1## where R.sub.1 is selected from the class of hydrogen or methyl groups, "a" is an integer from one to five, "b" is an integer from zero to seven, "c" is an integer from zero to two, "d" is an integer from zero to one, A is selected from the class of methyl or phenyl groups, R.sub.2 is selected from the class of methyl or phenyl groups, R.sub.3 and R.sub.4 represent either no group (cyclic ring from "c" to "d") or methyl or phenyl groups, act synergistically with vinyl pyrrolidone and hydroxy ethyl methacrylate to provide optically clear moderate water containing contact lenses of substantially increased oxygen permeability.

REFERENCES:
patent: 4120570 (1978-10-01), Gaylord
patent: 4139513 (1979-02-01), Tanaka et al.
patent: 4139692 (1979-02-01), Tanaka et al.
patent: 4152508 (1979-05-01), Ellis et al.

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