Detail of "1681-60-3"

Reference

Photosensitive compositions

Photosensitive compositions. Sugasawa, Noboru; Hayashi, Nobuyuki (Hitachi Chemical Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 61200536 A2 5 Sep 1986 Showa, 5 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: G03C001-68. ICS: C08F002-48; C08F299-06. APPLICATION: JP 85-41699 1 Mar 1985. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Photosensitive compns., useful for the fabrication of printed circuit boards, contain polymers [glass transition temp. (Tg) 40-130°] obtained by reaction of isocyanatoethyl methacrylate (I) and vinyl-type linear polymers (II) obtained by copolymg. 1 vinyl- and 1 OH-contg. compds. 5-85, 1 vinyl- and CO2H-contg. compds. 10-40, and 1 vinyl-contg. compds. ￡80%, where equiv. ratios of NCO of I and OH of II are 0.3-1.3, and sensitizers and/or their systems which form free radicals upon exposure to active light. Ethylene glycol monoethyl ether acetate (III) 411, methacrylic acid 66, styrene 15, Me methacrylate 45, Et acrylate 24, 2-hydroxyethyl methacrylate 150, and AIBN 4.5 parts were stirred at 95° for 5 h, mixed with a mixt. of 9 parts III and 1 part AIBN, stirred at 95° for 6 h, mixed with a mixt. of 2 parts III and 0.06 part hydroquinone, and stirred for 30 min to obtain a vinyl-type linear copolymer, which was kept at 65° and 175 parts isocyanatoethyl methacrylate was added dropwise over 1 h and stirred at 65° for 5 h to obtain a polymer (IV; Tg ~60°). IV 225, Kayacure DMBI (arom. tertiary amine) 4, 2,4-diethylthioxanthone 2.5, Acid Violet 0.3, III 25, MEK 12, and MeOH 11 g were stirred to obtain a compn., which was applied onto a Cu-plated laminate to form a ~10-m film. 1681-60-3 and 30674-80-7 which are cas registry numbers of substances are two of reagents here. The resulting photosensitive compn. was superposed with a neg. film, exposed in vacuo with 200 mJ/cm2, spray developed with 2% aq. Na2CO3, and etched with aq. FeCl3 (40° Baumé) to obtain a circuit board faithful to the neg. film, showing a resoln. 330 m. .