Claims
- 1. A UV curable, aqueous alkaline developable, composition comprising:
- (a) 10-50% by weight of (i) a urethane acrylate compound which is obtained by reacting substantially equal molar quantities of an aliphatic or cycloaliphatic diisocyanate, and a hydroxyalkyl acrylate, with an alkylene polyol having 3-6 hydroxyl groups, and 3-6 carbon atoms, with at least one mole of a dicarboxylic acid anhydride per mole of said alkylene polyol, (ii) 5-40% by weight of an aromatic urethane diacrylate, (iii) 2-30% by weight of an aliphatic or cycloaliphatic urethane diacrylate,
- (b) 4-60% of a reactive monomer diluent; and
- (c) 0.5-10% of a photoinitiator.
- 2. A UV curable, aqueous alkaline developable composition according to claim 1 where (i) said urethane acrylate is present in an amount of 10-30% by weight, (ii) said aromatic urethane diacrylate is present in an amount of about 10-30% by weight, and (iii) said aliphatic or cycloaliphatic urethane diacrylate is present in an amount of about 50-20% by weight of said composition.
- 3. A composition according to claim 1 wherein in (i) said aliphatic or cyclaoliphatic diisocyanate selected from the group consisting of dicyclohexylmethylene diisocyanate, isophorone, diisocyanate, and hexamethylene diisocyanate.
- 4. A composition according to claim 1 wherein in (i) said urethane acrylate is obtained from a hydroxyalkyl acrylate which is hydroxypropyl acrylate.
- 5. A composition according to claim 1 wherein in (i) said alkylene polyol is glycerol.
- 6. A composition according to claim 1 wherein said dicarboxylic acid anhydride is an unsaturated dicarboxylic acid anhydride.
- 7. A composition according to claim 1 wherein said dicarboxylic acid anhydride is maleic anhydride.
- 8. A composition according to claim 1 wherein said reactive monomer diluent includes a mono-, di- and/or tri-acrylate monomer.
- 9. A composition according to claim 1 wherein said reactive monomer diluent includes a hydroxyalkyl acrylate.
- 10. A composition according to claim 1 wherein said reactive monomer diluent includes an aryloxyalkyl acrylate.
- 11. A composition according to claim 10 wherein said aryloxyalkyl acrylate is phenoxyethyl acrylate.
- 12. A composition according to claim 1 in which said urethane acrylate has the following formula: ##STR8## R.sub.1 is aliphatic or cycloaliphatic, R.sub.2 and R.sub.3 are alkylene, having from 3-6 carbon atoms,
- R.sub.4 is aliphatic or cycloaliphatic, saturated or unsaturated, y is 0-4 and n is 1-5, provided that if y is 0, then n is at least 2.
- 13. A composition according to claim 12 in which y is 1 and n is 1.
- 14. A composition according to claim 12 in which y is 0 and n is 2.
- 15. A composition according to claim 1 wherein said urethane acrylate compound is characterized by terminal ethylene unsaturation, at least one terminal carboxylic acid group, and an alkylene group intermediate said terminal groups substituted with a hydroxyl group.
- 16. A composition according to claim 1 wherein said urethane acrylate compound has a terminal ethylenic unsaturation, at least two terminal carboxylic acid groups, and an alkylene group intermediate said terminal group optionally substituted with a hydroxyl group.
- 17. A composition according to claim 1 wherein in (ii) said aromatic diisocyanate is toluene diisocyanate.
- 18. A UV curable, aqueous alkaline developable composition according to claim 1 wherein said urethane acrylate compound has the formula: ##STR9##
- 19. A flexible solder mask coating product exhibiting Class III (IPC) electrical insulation resistance formed by curing the composition of claim 1.
RELATIONSHIP TO COPENDING PATENT APPLICATIONS
This application is a continuation-in-part of Ser. No. 853,482, filed Mar. 18, 1986, now U.S. Pat. No. 4,761,361, which is a continuation-in-part of Ser. No. 747,090, filed June 20, 1985, now U.S. Pat. No. 4,753,860 by the same applicants and assigned to the same assignee as herein.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4283480 |
Davies et al. |
Aug 1981 |
|
4304923 |
Rousseau |
Dec 1981 |
|
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
853482 |
Apr 1986 |
|
Parent |
747090 |
Jun 1985 |
|