Claims
- 1. A coating composition for use on a substrate comprising in admixture an optically clear blend of two or more polymers with a photosensitive compound that forms a strong acid upon image-wise exposure to actinic radiation, the composition of the blend comprising:
- (a) at least one first polymer or copolymer that is tacky as a result of having a glass transition temperature T.sub.g of below room temperature;
- (b) at least one second polymer or copolymer that has a T.sub.g sufficiently far above room temperature so that the blend of first and second polymer(s) is not tacky at room temperature, said second polymer(s) having functional groups that are sensitive to catalytic amounts of an acid, such that the reaction of functional groups in the presence of the acid results in a polymer with carboxylic acid groups or phenolic groups said resulting polymer being immiscible with the tacky polymer in the blend so that the blend becomes tacky after exposure to actinic radiation; and
- (c) a composition that generates an acid upon exposure to actinic radiation.
- 2. The composition of claim 1 further containing a development facilitating additive.
- 3. The composition of claim 1 or claim 2 wherein the low T.sub.g first polymer is poly(2-phenylethyl acrylate) or poly(3-phenyl-1-propyl acrylate).
- 4. The composition of claim 1 or claim 2 in which the polymers are prepared by a method selected from addition polymerization, condensation polymerization, and ring opening polymerization.
- 5. The composition of claim 1 or claim 2 wherein the molecular weight of the first polymer or copolymer is less than about 30,000 g/mol.
- 6. The composition of claim 1 or claim 2 wherein the T.sub.g of the blend is higher than that of the first tacky polymer and lower than that of the second acid labile polymer.
- 7. The composition of claim 1 or claim 2 wherein the second polymer is selected from an acetal ester, t-butyl ester, a t-butoxycarbonyloxy derivative of a phenol, and an acetal ether of a phenol.
- 8. The composition of claim 1 or claim 2 wherein the second polymer is selected from poly(tetrahydro-2-pyranyl methacrylate), poly(tetrahydro-2-pyranyl acrylate, poly(tetrahydro-2-furanyl)methacrylate and poly(tetrahydro-2-furanyl)acrylate .
- 9. The composition of claim 1 or claim 2 wherein the acid generating composition is selected from diazonium, phosphonium, sulfonium, and iodonium salts, halogen compounds, o-quinone diazide sulfochlorides, organometal/organohalogen combinations, and o-nitrobenzyl esters of strong acids.
- 10. The composition of claim 1 or claim 2 wherein the composition that generates an acid upon exposure to actinic radiation is diphenyl-3-(9-anthryl)-1-propylsulfonium hexafluoroantimonate.
- 11. The composition of claim 1 or claim 2 wherein the molecular weight of the second polymer or copolymer is less than 30,000 g/mol.
- 12. The composition of claim 1 in a solvent selected from 2-butanone, acetone, methylene chloride, tetrahydrofuran and ethyl acetate.
- 13. The composition of claim 2 wherein the development faciliting additive is selected from organic solvents and plasticizers.
- 14. The composition of claim 13 wherein the development facilitating additive is selected from a C.sub.4 to C.sub.14 glycol, diacetone alcohol, dimethylsulfoxide and dibutyl phthalate.
- 15. The composition of claim 13 wherein the development facilitating additive comprises 2% to 10%, by weight, of the coating composition.
- 16. The composition of claim 1 or claim 2 coated on a support.
- 17. The composition of claim 16 wherein the support is selected from paper, cardboard, metal sheets, wood, glass, film or fiber webs of natural polymers and films or fiber webs of synthetic polymers.
- 18. The coated support of claim 16 having one or more additional non-photosensitive layer(s).
- 19. The coated support of claim 18 wherein the additional non-photosensitive layer(s) is an antihalation coating and/or a top protective film.
- 20. A radiation-sensitive element comprising a supported polymer blend as described in claim 16.
Parent Case Info
This is a continuation-in-part of Ser. No. 07/564,246, filed on Aug. 8, 1990 now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0303266 |
Feb 1989 |
EPX |
A20302359 |
Feb 1989 |
EPX |
A20440444 |
Aug 1991 |
EPX |
3806515 |
Mar 1988 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
564246 |
Aug 1990 |
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