Reference

Heat-resistant resins

Heat-resistant resins. Saida, Kenichi; Sakai, Masahiko (Hitachi, Ltd.Several substances are used for example 25085-99-8 and 108-31-6 which are their cas registry numbers., Japan). Japan. Kokai JP 51052499 10 May 1976 Showa, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G018-79. APPLICATION: JP 74-125441 1 Nov 1974. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Polyisocyanates are treated with epoxy resins (epoxy-NCO equiv. ratio 0.1-2) in the presence of isocyanurate ring-forming catalysts and the products heated with maleimidobenzoic acids to provide elec. insulating coating compns. Thus, 82 g p-maleimidobenzoic acid [17057-04-4] (from p-aminobenzoic acid [150-13-0] and maleic anhydride [108-31-6]) was added (CO2H-NCO ratio 1:2) to a prepolymer varnish and the mixt. kept 1 hr at 100.degree. to provide a product with 10.9 sec gelation time at 250.degree. and >3 months pot life. The prepolymer was prepd. by heating (at 100.degree.) diphenylmethane diisocyanate [101-68-8] 100, DER 332 [25085-99-8] (epoxy-NCO equiv. ratio 2:5) 56, 2-phenylimidazole [670-96-2] 1.56, and N-methylpyrrolidinone 300 g until the product became insol. in PhMe and iso-BuCOMe. .

Heat-resistant resins

Heat-resistant resins. Saida, Kenichi; Sakai, Masahiko (Hitachi, Ltd., Japan). Japan. Kokai JP 51052498 10 May 1976 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G018-06. APPLICATION: JP 74-125437 1 Nov 1974. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Polyisocyanates are prepolymd. in the presence of trimerizing catalysts (for isocyanurate formation) and then treated with a maleimidobenzoic acid to provide an elec. insulating coating. Thus, 100 g diphenylmethane diisocyanate and 3 g tris(dimethylaminomethyl)phenol [26444-72-4] in 300 g 1-methyl-2-pyrrolidinone were heated at 100.degree. until the reaction product [9016-87-9] became insol. in PhMe and MeCOBu-iso. The prepolymer soln.Several substances with their cas registry numbers 108-80-5 and 9016-87-9 may be metioned in this study. (26% solids) was heated 1 hr at 100.degree. with 110 g p-maleimidobenzoic acid [17057-04-4] to give a coating material with >3 months ambient temp. storage life and 12 sec skinning time at 250.degree.. A 45 .mu. cured (20 min at 250.degree.) coating on Cu had pencil hardness 9H and breakdown voltage 0.115 kV/.mu.. .