Composite light-polarizing element

Claim 2

The invention of claim 1 wherein the ratio between said nitrocellulose and said melamine-formaldehyde condensation polymer is 1:1, by weight.

Claim 3

A synthetic plastic light-polarizing composite ophthalmic lens comprising a light-polarizing element interposed between and bonded to in situ polymerized molded elements comprising an optical quality synthetic plastic material wherein said light-polarizing element comprises a light polarizer having, as a continuous coating on each surface thereof a layer which enhances adhesion between said light polarizer and subsequently bonded lens components and inhibits migration of constituents of lens components polymerized in contact with the light-polarizing element, during formation thereof, through said layers, said layers consisting essentially of crosslinked nitrocellulose and an additional polymeric constituent which inhibits migration of materials employed in the in situ polymerization of lens elements through said layer during formation of said lens elements in contact with said light-polarizing element.

Claim 4

The invention of claim 4 wherein said additional polymeric constituent is a melamine-formaldehyde condensation polymer.

Claim 5

The invention of claim 5 wherein the ratio between said nitrocellulose and said melamine-formaldehyde condensation polymer is 1:1, by weight.

Claim 6

The invention of claim 4 wherein said molded elements comprise polydiethylene glycol bisallyl carbonate.

Claim 7

A composite synthetic plastic light-polarizing ophthalmic lens having a concave and a convex surface comprising: a light-polarizing element which comprises a transparent sheet of polyvinyl alcohol; a thin, uniform support layer comprising cellulose acetate butyrate bonded to each surface of said light-polarizing element; a thin coating consisting essentially of crosslinked cellulose nitrate and a melamine-formaldehyde condensation polymer on each cellulose acetate butyrate surface opposed to said light-polarizing element; and a molded lens element comprising polydiethylene glycol bisallyl carbonate adhered to each of said coatings consisting essentially of cellulose nitrate and a melamine-formaldehyde condensation polymer.

Claim 8

The invention of claim 8 wherein said coatings consisting essentially of cellulose nitrate and a melamine-formaldehyde condensation polymer are from 2 to 20 microns in thickness.