GB1455655A - Photopolymerisable compositions - Google Patents

Abstract

1455655 Photopolymerizable compositions TEIJIN Ltd 6 Aug 1974 [7 Aug 1973] 34685/74 Heading C3P [Also in Division G2] Photopolymerizable compositions comprise an ethylenically unsaturated photopolymerizable compound, a photopolymerization initiator and, as a thermal polymerization inhibitor, at least one N-nitroso compound of the formula wherein R<SP>1</SP> and R<SP>2</SP> which may be the same or different represent (a) an optionally substituted, monovalent hydrocarbon radical, (b) a radical of the formula -SO 2 -Q where Q is an optionally substituted hydrocarbon radical, or (c) a radical of the formula where X is an optionally substituted divalent hydrocarbon radical and R<SP>3</SP> is an optionally substituted monovalent hydrocarbon radical, or R<SP>1</SP> and R<SP>2</SP> together form an optionally substituted divalent hydrocarbon radical which may optionally contain an O or N atom in the chain, thereby forming a ring with the N atom to which they are attached. The unsaturated compound may be acrylic, methacrylic, ethacrylic or chloroacrylic acid, an ester or amide of (meth)-acrylic acid optionally having more than one double bond, a vinyl ester, styrene or a derivative thereof, an allyl ester, or a mixture of such compounds. The compositions may also contain a high molecular weight binder, e.g. an addition or condensation polymer or a cellulose derivative; such binder may have unsaturated groups therein, e.g. an unsaturated polyester or a methyl methacrylate/styrene/methacrylic acid copolymer modified by reaction with glycidyl methacrylate (see the examples). Examples of suitable initiators are benzoin and its substituted derivatives, benzoin ethers, disulphides, anthraquinone and its derivatives, 2-naphthalene-sulphonyl chloride, erosine, fluoresceine and indanthrene. Other optional components include conventional inhibitors, fillers and plasticizers. The compositions are useful for forming printing plates.