IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0595448
(1984-03-30)
|
우선권정보 |
GB-19830009019 (1983-03-31) |
발명자
/ 주소 |
- Dickinson, Peter
- Ellwood, Michael
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
16 인용 특허 :
7 |
초록
▼
Aqueous dispersions comprising water, a cationically curable compound, and a photosensitive onium salt, and preferably other ingredients such as sensitizers, fillers, and plasticizers, are useful for making printing screens, lithographic plates, and printed circuit resists. After exposure, the un-cu
Aqueous dispersions comprising water, a cationically curable compound, and a photosensitive onium salt, and preferably other ingredients such as sensitizers, fillers, and plasticizers, are useful for making printing screens, lithographic plates, and printed circuit resists. After exposure, the un-cured composition is easily removed by washing with water.
대표청구항
▼
1. A composition in the form of an aqueous dispersion comprising water, at least one dispersed cationically curable epoxy resin, a water-soluble colloid, and a photosensitive sulphonium or iodonium salt capable on exposure to actinic radiation of effecting cationic polymerisation and thus insolubili
1. A composition in the form of an aqueous dispersion comprising water, at least one dispersed cationically curable epoxy resin, a water-soluble colloid, and a photosensitive sulphonium or iodonium salt capable on exposure to actinic radiation of effecting cationic polymerisation and thus insolubilization of the said epoxy resin. 2. A composition according to claim 1 in which the curable compound is a mixture of (1) one or more low viscosity epoxy diluents selected from the group consisting of glycidyl ether, glycidyl acrylates, 4-vinylcyclohexene dioxide, limonene dioxide, 1,2-cyclohexene dioxide and 3,4-epoxycyclohexylmethyl-3,4-cyclohexanecarboxylate, and (2) one or more high molecular weight epoxy resins. 3. A composition according to claim 1 comprising, by weight of the said composition, 40-80% of water, 10-60% of epoxy resin (including reactive diluent), 4-14% of water soluble colloid, 1 to 10% of onium salt, and 0 to 50% of sensitiser effective in increasing the spectral sensitivity of the onium salt. 4. A composition according to claim 1 in which the photoinitiator is an iodonium salt of the formula: ##STR## where X - is tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate, hexafluoroantimonate, trifluoromethanesulphonate, or perchlorate, and R 1 and R 2 are each selected from hydrogen, halogen, straight or branched alkyl, alkoxy, aryl, acyl, nitro or cyano. 5. A composition according to claim 4 in which the photoinitiator is 4,4-dimethyldiphenyliodonium hexafluorophosphate or diphenyliodonium hexafluorophosphate. 6. A composition according to claim 1 in which the photoinitiator is a sulphonium salt of the formula: ##EQU##(R 3 ) a (R 4 ) b (R 5 ) c S .sym..X .crclbar. where X - is tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate, trifluoromethanesulphonate, perchlorate or hexafluoroantimonate, R 3 is a monovalent aromatic radical, which may be substituted by one or more alkyl, aryl, alkoxy, hydroxy, phenoxy, thiophenoxy, mercaptan or acyl groups or halogen atoms, R 4 is a monovalent organic aliphatic radical selected from alkyl, cycloalkyl and substituted alkyl, R 5 is a polyvalent organic radical forming a heterocyclic or fused ring structure with S +, a is a whole number from 0 to 3 inclusive, b is a whole number from 0 to 2 inclusive, and c is 0 or 1, and a+b+c=3. 7. A composition according to claim 6 in which the photoinitiator is a sulphonium salt of the formula: ##STR## 8. A composition according to claim 1 which also comprises a sensitizer to increase the spectral sensitivity of the photosensitive onium salt. 9. A composition according to claim 8, in which the said sensitiser is 9,10-diethoxyanthracene or an alkylated 9,10-diethoxyanthracene. 10. A composition according to claim 1 which also comprises a surfactant as dispersion stabilizers. 11. A composition according to claim 1 in which the said colloid is polyvinylalcohol, polyvinylpyrrolidone, gelatin, hydroxyethylcellulose or hydroxypropylcellulose. 12. A composition according to claim 1 which also comprises one or more of an inert polymeric filler, an inert organic filler, a plasticiser, an organic solvent, a biocide, a defoamer, a pigment, or a dye. 13. A composition according to claim 12 in which the said plasticizer is dibutylphthalate. 14. A composition according to claim 12 in which the said inert filler is a polyvinylacetate homopolymer, a polyvinylacetate-polyvinylchloride copolymer, starch, silica, kaolin or titanium dioxide. 15. A composition according to claim 12 comprising, by weight of the said composition, 50 to 70% of water, 25 to 50% of epoxy resin (including reactive diluent), 2 to 5% of iodonium or sulphonium salt, 0 to 3% of sensitiser effective in increasing the spectral sensitivity of the onium salt, 0 to 2% of an inert polymer, 0 to 2% of a surfactant, 0 to 3% of a plasticiser, 4 to 14% of a water-soluble colloid, and 0 to 15% of organic solvent. 16. A composition according to claim 10 in which the surfactant is a non-ionic surfactant. 17. A composition according to claim 12 in which the dye is one which gives a colored contrast on exposure to actinic light.
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