Claims
- 1. An organic solvent free, phosphate free, lighographic desensitizing composition which comprises:
- (a) from about 0.1% to about 20.0% by weight of the composition of a copolymer of polymethyl vinyl ether and maleic acid having the formula ##STR5## which has a molecular weight in an amount of from about 20,000 to about 70,000; and
- (b) from about 0.1% to about 20.0% by weight of the composition of a desensitizing component comprising one or more hydroxy carboxylic acids or salts; and
- (c) sufficient water to formulate a desensitizing composition; and
- (d) sufficient base to adjust the pH of the composition into the range of from about 6.5 to about 7.5.
- 2. The composition of claim 1 wherein component (b) comprises one or more compounds selected from the group consisting of citric acid, sodium citrate, glycolic acid, tartaric acid, D.L. glyceric acid, malic acid, 4-hydroxy butyric acid, L-tartaric acid and mucic acid.
- 3. The composition of claim 1 wherein said component (d) comprises one or more compounds selected from the group consisting of sodium, lithium and potassium hydroxide.
- 4. The composition of claim 1 further comprising a dispersing agent.
- 5. The composition of claim 4 wherein said dispersing agent comprises one or more compounds selected from the group consisting of water soluble polyethylene glycols, glycerin and potassium salts of polymerized alkyl naphthalene sulfonic acids.
- 6. The composition of claim 1 wherein component (a) is present in an amount of from about 0.5% to about 10.0% based on the weight of the desensitizing composition.
- 7. The composition of claim 1 wherein component (b) is present in an amount of from about 0.5% to about 10.0% by weight of the composition.
- 8. The composition of claim 1 wherein said composition has a pH in the range of from about 7.0 to about 7.5.
- 9. The composition of claim 4 wherein said dispersing agent is present in an amount of from about 0.1% to about 10.0% based on the weight of the composition.
- 10. The composition of claim 4 wherein said component (a) is present in an amount of from about 1.0% to about 5.0%; and said component (b) is sodium citrate and is present in an amount of from 1.0% to about 5.0%; and component (d) is potassium hydroxide in an amount sufficient to give the desensitizing composition a pH of from about 7.0 to about 7.2; and said dispersing agent is a potassium salt of a polymerized alkyl naphthalene sulfonic acid in an amount of from about 0.5 to about 5.0%, based on the weight of the desensitizing composition.
Parent Case Info
This application is a division of U.S. patent application, Ser. No. 014,968, filed Feb. 17, 1987, now U.S. Pat. No. 4,728,597.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
63124 |
Apr 1982 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
14968 |
Feb 1987 |
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