Patent GB-1304112-A (GB)
IPC: D06M13/41
Filed: 1970-01-28
Abstract: 1304112 Photopolymerization; cross-linking polymers UNION CARBIDE CORP 28 Jan 1970 [28 Jan 1969 2 July 1969] 4161/70 Headings C3A C3P C3R and C3T [Also in Divisions B2 and D1] Ethylenically unsaturated monomers are polymerized and curable organic polymer compositions are cross-linked by exposing to predominantly continuum visible light radiation from a swirl-flow plasma arc with a source intensity of at least 350 watts/sq. cm. steradian with at least 70% of the light radiated at a wavelength longer than 4000 Šngstroms and at least some of the balance at less than 4000 Šngstroms. The light may be from a swirl-flow plasma arc light radiating apparatus, particularly using argon, krypton, neon or xenon as gaseous medium.. Polymerization and crosslinking may be effected in bulk, solution, suspension, as a coating on a substrate or impregnated in a fibrous material; in the presence of cross-linking agents, e.g. polyunsaturated compounds, photo-sensitizers, e.g. benzophenones and xanthones, and free radical initiators, e.g. peroxides and azo compounds. Many suitable polymerizable monomers, curable polymer compositions, cross-linking agents, photo-sensitizers and radical initiators are specified and examples describe the irradiation of (1) ethylene/  vinylbicyclohept-2-en-5-carboxylate copolymer, (2 and 4) ethylene/bicyclohepta-2,5-diene copolymer, (3) ethylene/5-ethylidene bicycloheptene-2, (5) gumstock comprising dimethylsiloxane/methylvinyl siloxane copolymer, ethoxy terminated polydimethyl siloxane and trimethylsilyl terminated polymethylhydrogen siloxane, a peroxide and/or benzophenone, (6) polycaprolactone diol / di - (2 - isocyanatoethyl)bicyclohept-5-en-2,3-dicarboxylate condensate, (7) polyethylene, (8) cellulose acetate bicyclo - hept - 5 - en - 2 - ylmethyl carbamate, (10) polyethylene glycol/di-(chlorocarbonyl)- bicyclohept-2-ene condensate, (11) 5,6-di-(hydroxymethyl)bicyclohept-2-ene/1,6-hexamethylene diisocyanate condensate, (12) ethylene/5- vinylbicyclo - hept - 2 - ene copolymer, (13) ethylene / bicyclohept - 5 - en - 2 - ylmethyl acrylate copolymer, (14) condensates of bis-(isocyanatoethyl)bicyclohept-5-en-2,3-dicarboxylate with glycerol/propylene oxide adduct and butoxydiethylene glycol, castor oil and butoxydiethylene glycol or glycerol/propylene oxide adduct and #-caprolactone, (16) polyethylene glycol / di - (2 - isocyanato ethyl) bicyclohept- 5 - en - 2,3 - dicarboxylate condensate, (17) polypropylene glycol/trimethylol propane/di-(2- isocyanato ethyl) bicyclo-hept-5-en-2,3-dicarboxylate, (19) bicyclohept - 5 - en - 2,3 - dicarboxylic anhydride / 2,2 - dimethyl - 3 - hydroxypropyl - 2,3 - dimethyl - 3 - hydroxypropionate/ pentaerythritol polyester and bicyclohept-5-en- 2-ylmethyl acrylate, neopentyl glycol diacrylate, tetramethylene glycol diacrylate, 2-methyl- 2-ethyl-1,3-propanediol diacrylate, pentamethylene glycol diacrylate, polyethylene glycol diacrylate or 2-butoxyethyl acrylate, (20) the same polyester and 2-phenoxyethyl acrylate, 2- ethylhexyl acrylate, 2-phenylethyl acrylate, furfuryl acrylate, dicyclopentenyl acrylate, 2 dicyclopentenoxyethyl and 6-dicyclopentenoxyhexyl acrylates, butanediol diacrylate, pentanediol diacrylate or styrene, (21) methyl methacrylate / ethyl acrylate / acrylic acid copolymer and various acrylates, (22) lauryl methacrylate/ bicyclohept-5-en-2-ylmethyl acrylate copolymer and various acrylates, (26) bicyclohept-2-en-5,6- dicarboxylic acid anhydride/3-hydroxyneopentyl 3-hydroxypivalate polyester and various acrylates, (27) bicyclohept-2-en-5,6-dicarboxylic acid anhydride / 2,2 - dimethyl - 3 - hydroxypropyl 2,2 - dimethyl - 3 - hydroxypropionate/ pentaerythritol polyester, various acrylates and bis - (socyanatoethyl) - 5 - norbornene - 2,3- dicarboxylate, (29) ethylene glycol phthalate maleate polyester and styrene, (30) propylene glycol terephthalate maleate polyester and styrene, (32 and 39) N-methylol acrylamide impregnated fabric, (35) polymethyl methacrylate, various acrylates and 5-norbornen-2-ylmethyl 5-norbornen-2-carboxylate, (36) polycaprolactone triol (derived from glycerol/ethylene oxide adduct and caprolactone)/bis (isocyanatoethyl)- 5 - norbornene - 2,3 dicarboxylate condensato and neopentyl glycol diacrylate, (37) neopentyl glycol / maleic anhydride / methoxy capped polymethylphenyl siloxane polyester reacted with dicyclopentadiene, 2-ethylhexyl acrylate and neopentyl glycol diacrylate, (38) 2-butoxyethyl acrylate, neopentyl glycol diacrylate, 2) ethylhexyl actylate or 2-methoxyethyl acrylate, and (40) polyisochloroprene.