PHOTOPOLYMERISATION OF ETHYLENICALLY UNSATURATED ORGANIC COMPOUNDS

• Main Authors: GERARD ALBERT DELZENNE, URBAIN LEOPOLD LARIDON
• Format: Patent
• Language: English
• Published: 26.01.1971
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; ELECTROGRAPHY; HOLOGRAPHY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MATERIALS THEREFOR; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; ORIGINALS THEREFOR; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP

1,180,846. Photopolymerization. GEVAERTAGFA N.V. 15 July, 1968 [8 Aug. 1967], No. 36394/67. Headings C3G and C3P. [Also in Division G2] Ethylenically unsaturated compounds are photopolymerized by a process comprising exposing to actinic light a composition containing an ethylenically unsaturated compound and, as photopolymerization initiator, a compound containing at least one oxime ester group (i.e. an O-acylox group). The initiator may be a monomeric compound containing one or two oxime ester groups or a polymeric compound (as described in Specification 1,180,845) which contains oxime ester groups in side chains or as integral parts of the main polymer chain. When, in the polymeric initiators, the oxime ester groups are in side-chains, e.g. in a methyl methacrylate - 2,3 - butanedione - mono - (O - methacrylyloxime) copolymer, the ethylenically unsaturated monomer is graft polymerized on to the polymeric initiator; and when the oxime ester groups are included in the main chain, as in a polyester-type condensation product, the initiator is fragmented by actinic light and the fragments are block copolymerized with the ethylenically unsaturated monomer. The photopolymerization can be effected in bulk, emulsion, suspension or solution; polymerization may be effected in the presence of a hydrophilic or hydrophobic, natural or synthetic polymeric carrier or binding agent. Ethylenically unsaturated monomers specified are styrene, acrylamide, methacrylamide, methyl methacrylate, diethylamino-ethyl methacrylate and acrylonitrile and mixtures thereof; and compounds having more than one double bond such as divinyl benzene, diglycol diacrylates and N,N- alkylene-bis-acrylamides, and allyl esters of polyacrylic acid, maleic esters of polyvinyl alcohol, polyolefins containing residual unsaturation, unsaturated polyesters, cellulose acetomaleates and allylcellulose. The photopolymerization process is useful in the preparation of photographic images, and the polymerization products are also useful in adhesives, coating, impregnating and safety-glass interlayers. The process can also be effected in a mould to give articles such as lenses.