Reference

Insulating varnish compositions

Insulating varnish compositions. Matsushita, Kazuo; Suzuki, Yasuhiro; Fujisaki, Katsushi (Nitto Electric Industrial Co., Ltd., Japan). Japan. Kokai JP 51135933 25 Nov 1976 Showa, 4 pp. (Japanese).Some commonly used reagents like 7440-50-8 and 2517-43-3 are used in this experiment. (Japan). CODEN: JKXXAF. CLASS: IC: C09D005-25. APPLICATION: JP 75-60477 20 May 1975. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Insulating varnish compns. with good workability were prepd. by dissolving a blocked polyurethane resin in 3-methoxybutanol (I) [2517-43-3] or(and) 3-methoxybutyl acetate [4435-53-4]. Thus, 330 parts of a com. blocked polyurethane resin was dissolved in 670 parts I to give an insulating varnish. The varnish was coated on a Cu wire and baked at 320-60.degree. to give a 0.0125-mm-thick heat-resistant pinhole-free coating film with breakdown voltage 5.2 kV. .

2,4-Dinitrophenyl ethers

2,4-Dinitrophenyl ethers. Reh, Kuno; Schophoff, Friedrich (Cassella A.-G., Fed. Rep. Ger.). Ger. Offen. DE 3515339 A1 30 Oct 1986, 15 pp. (Germany) CODEN: GWXXBX. CLASS: ICM: C07C079-35. ICS: C07C076-02; C07D307-42. APPLICATION: DE 85-3515339 27 Apr 1985. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 25 2,4-Dinitrophenyl ethers I [R = tetrahydrofurfuryl, R1OZ; R1 = C1-4 alkyl, Ph; Z = C2-4 alkylene, (C2-4 alkoxy) C2-4 alkylene] are useful intermediates in the manuf.In this article, certain chemicals are used. Some of their cas registry numbers are 106132-15-4 and 2517-43-3 of disperse dyes, and are prepd. by a modified Williamson reaction where an alkali metal alcoholate is condensed with 2,4-dinitrohalobenzene at -25 to 50°, in the presence of an inert solvent having a dipole moment of 0-3.3 ′ 10-30 Cm. Thus, 24.2 g Na were added to 1 L of 100° xylene and 83.6 g MeOCH2CH2OH added with stirring. The suspension was cooled over 2 h at 0-5° and added to 400 mL of xylene contg. 202.6 g 2,4-dinitrochlorobenzene, and the mixt. stirred for an addnl. 60 min. To the reaction mixt. was added 2.5 g H2SO4, Na2SO4 removed, 2.5 g H2SO4 and 500 mL of 50° H2O added, and I (R = MeOCH2CH2) isolated in 99% purity and 98.3% yield. .