Claims
- 1. A composition comprising:
- (1) from about 60 to about 95 weight percent, based on the total weight of the composition, of n-amyl acetate as a compatible solvent;
- (2) from about 5 to about 25 weight percent, based on the total weight of the composition, of a film forming unmodified polymer;
- (3) from about 10 to about 35 weight percent, based on the total weight of solids in the film forming composition, of a plasticizer comprising dipropylene glycol dibenzoate; and
- (4) from about 0.1 to about 5 weight percent, based on the total weight of the composition, of an anti-static agent.
- 2. A composition suitable for forming a self-supporting removable polymeric film on at least one surface of a lens wafer suitable for forming a composite lens which composition comprises:
- (a) a first copolymer that comprises from about 75 to 98 weight percent vinyl chloride and about 2 to 25 weight percent vinyl acetate and that has a number average molecular weight of about 25,000 to 28,000;
- (b) a second copolymer that comprises about 80 to 90 weight percent vinyl chloride and about 10 to 20 weight percent vinyl acetate and that has a number average molecular weight of about 40,000 to 50,000 wherein the weight ratio of said first copolymer to said second copolymer ranges from about 8:1 to about 19:1; and
- (c) a compatible solvent which dissolves the first and second copolymer.
- 3. The composition of claim 2 wherein said compatible solvent is a mixture of acetone and amyl acetate.
Parent Case Info
This application is a divisional of Application No. 08/379,328, filed Jan. 26, 1995.
US Referenced Citations (11)
Foreign Referenced Citations (6)
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Date |
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230044 |
Dec 1984 |
JPX |
62-115 073 |
May 1987 |
JPX |
1 176 484 |
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Divisions (1)
|
Number |
Date |
Country |
Parent |
379328 |
Jan 1995 |
|