Reference

Aniline-formaldehyde resin

Aniline-formaldehyde resin. Constantinescu, Mihail (Combinatul Chimic Fagaras, Rom.). Rom. RO 60257 10 Mar 1976, 3 pp. (Romanian). (Romania). CODEN: RUXXA3. CLASS: IC: C08G073-02. APPLICATION: RO 73-74746 11 May 1973. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) A binary acid catalyst (prepd. from sulfanilic acid (I) [121-57-3] and HCl, H3PO4, p-toluenesulfonic acid [104-15-4], benzenesulfonic acid [98-11-3], or naphthalenesulfonic acid) for the copolymn. of aniline with H2CO was required in small amts. only, and problems of corrosion and product [25214-70-4] neutralization were eliminated when the product was used, e.g., in hardening epoxy resins, and in prepn. of poly(amide imides) and poly(ester imides). Thus, 186 g aniline was copolymd. with 100 g 37% HCHO at 100° in the presence of 5 cm3 37% HCl and 1.2 g I at 40-100° in an aq. system.

Delustering of electrodeposited articles

Delustering of electrodeposited articles. Ishigaki, Masaru (Honny Chemicals Co., Ltd., Japan). Japan. Kokai JP 52137444 16 Nov 1977 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C25D013-00. APPLICATION: JP 76-54311 14 May 1976. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Metals were electrodeposited with acrylic resins, treated with p-toluenesulfonic acid [104-15-4], H3PO4, or a similar acid, and baked to form dull surfaces.. Thus, an Al alloy was degreased, etched in 5% aq. NaOH for 10 min at 60°, electrolyzed in 10% (vol.) aq. H2SO4 at 20° for 30 min, electrodeposited with a coating compn. (prepd. by neutralizing hydroxyethyl acrylate-methacrylic acid-Me methacrylate copolymer [66167-58-6] and an alc.-modified melamine resin with Et3N and dilg. with water to 10%), washed with water, immersed in aq. H3PO4-HNO3 at 18° and pH 2 for 5 min, washed with water, and baked at 160° for 30 min to form a coating having ~20% gloss, compared with 93% for a similar coating having no acid treatment.