Reference

Photosensitive polymer compositions

Photosensitive polymer compositions. (Hitachi, Ltd.; Hitachi Chemical Co., Ltd. 64427-99-2 and 24980-39-0 are also occured in this study., Japan). Jpn. Kokai Tokkyo Koho JP 58160320 A2 22 Sep 1983 Showa, 8 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G073-10; C08F002-46. APPLICATION: JP 82-42778 19 Mar 1982. DOCUMENT TYPE: Patent CA Section: 38 (Plastics Fabrication and Uses) Section cross-reference(s): 37, 74 Photoresist compns. contain polyamic acids or their NH4 salts, unsatd. amines, and optionally photosensitizers. Thus, a polyamic acid [25038-81-7] (viscosity 60 P) was prepd. from pyromellitic dianhydride 109, oxydianiline 100, and N-methylpyrrolidinone 1791 g. This soln. (20 g) was mixed with 1.9 g 2-(dimethylamino)propyl sorbate [89664-26-6] to give a UV photoresist for Si wafers. .

Preparation of polyimide varnish

Preparation of polyimide varnish. (Toray Industries, Inc., Japan). Jpn. Kokai Tokkyo Koho JP 58189260 A2 4 Nov 1983 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09D003-49; C08G073-10; C08L079-08. APPLICATION: JP 82-71333 30 Apr 1982. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) A tetracarboxylic acid dianhydride is heated with a diamine in a solvent to give a polyamic acid which is heated further to give a polyimide suspension. The same or a different combination of dianhydride and diamine is then heated in the suspension to form a sol. polyamic acid in addn. to the polyimide, giving a binder dispersion suitable for screen-printing inks. Thus, a 120.1-124.3 diaminodiphenyl ether-pyromellitic dianhydride copolymer [25038-81-7] polyimide suspension was prepd. in 695.6 g N-methyl-2-pyrrolidinone by heating the comonomers at ￡150°. To the suspension were added 94.3 g diaminodiphenyl ether and 139.3 g benzophenone tetracarboxylic dianhydride and the mixt. was heated at 70° to give a polyamic acid [64427-99-2]-contg. 24980-39-0 and 64427-99-2 are just another two chemicals used in this study. varnish of viscosity 1000 ± 200 P. .