COATED ARTICLE IN THE FORM OF A STORABLE SHEET, MAINLY CONSISTING OF A SUBSTRATE SHEET AND A DRY PHOTOPYMERISABLE FILM APPLICATED TO THIS COATING AND METHOD FOR MANUFACTURING A PRINTED CIRCUIT.

摘要

1361298 Photopolymerizable compositions DYNACHEM CORP 2 Feb 1972 [4 Feb 1971] 4814/72 Heading C3P [Also in Division G2] Photopolymerizable compositions comprise (A) from 10 to 60 parts by weight of an addition polymerizable material comprising one or more non-gaseous compounds having a boiling point above 100‹ C. at atmospheric pressure and containing at least two terminal ethylenic groups, (B) 0À001 to 10 parts by weight of a photo-initiated free-radical generating polymerization initiator, (C) 0À001 to 5 parts by weight of a thermal addition polymerization inhibitor and (D) 40 to 90 parts by weight of a binding agent which is a polymer of (i) at least one non-acidic vinyl compound of the formula wherein R is H, C 1 to C 6 alkyl or halogen and X is H and Y is OOCR 1 , OR 1 , OCR 1 , COOR 1 , CN, CH = CH 2 , or Cl; or X is methyl and Y is COOR 1 , CN, CH = CH 2 or or X and Y are both Cl, and wherein R 1 is C 1 to C 12 alkyl, phenyl or benzyl, and R 3 and R 4 are the same or different and are H, C 1 to C 12 alkyl or benzyl; and (ii) at least one ,#-unsaturated carboxylic acid having 3 to 15 carbon atoms, the proportions of (i) and (ii) being such that the binding agent is soluble in an aqueous solution containing 0À01 to 10% by weight of a watersoluble base. The compositions may additionally contain dyes, pigments, plasticizers and adhesion promoters. The polymerizable material (A) may be, for example, a poly(meth)acrylate ester of a glycol, polyglycol or other polyhydroxy compound, a poly(meth)acrylamide compound, #-methacrylamidoethyl methacrylate or a divinyl ester of a dicarboxylic or disulphonic acid. The binding agent (D) may be, for example, a copolymer of (i) styrene, alphamethylstyrene, p-methylstyrene, p-t-butylstyrene, a vinyl carboxylate ester, vinyl chloride, vinylidene chloride, methyl(meth)acrylate, (meth)acrylonitrile, methacrylamide, an N- alkylacrylamide, a vinyl alkyl ketone or a vinyl alkyl ether with (ii) acrylic, methacrylic, cinnamic, crotonic, sorbic, itaconic, propiolic acid, maleic or fumaric acid, or a half-ester of itaconic, maleic or fumaric acid. Specified binding agents are styrene/acrylic acid copolymer, styrene/ methacrylic acid copolymer, styrene/monobutyl maleate copolymer and vinyl acetate/crotonic acid copolymer. The initiator (B) may be a quinone compound, such as anthraquinone and derivatives thereof, as well as compounds such as diacetyl, benzil, benzoin and benzoin ethers, pivaloin and silver persulphate. Suitable inhibitors (C) include phenols, copper resinate, naphthylamines, cuprous chloride, phenothiazine, pyridine, nitrobenzenes, p-toluquinone, chloranil and aromatic phosphites. The compositions are useful in the production of printing plates, photoresistors and printed circuits (see Division G2).