Reference

Chlorination of hydroquinone

Chlorination of hydroquinone. Irwin, Robert S. (du Pont de Nemours, E. I., and Co. , USA). U.S. US 4439596 A 27 Mar 1984, 4 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C039-24; C08G063-68. NCL: 528191000. APPLICATION: US 83-477585 21 Mar 1983. DOCUMENT TYPE: Patent CA Section: 40 (Textiles) Chlorination of hydroquinone (I) [123-31-9] in a soln. or slurry contg. acetic acid [64-19-7] with SO2Cl2 at the SO2Cl2-I mol ratio 0.8-1.2 yields a mixt. contg. predominantly chlorohydroquinone (II) [615-67-8], which is acetylated, polycondensed with suitable monomers to give a polyester, and spun into fibers. Thus, 0.5 mol SO2Cl2 chlorinated 0.5 mol I in 500 mL acetic acid gave a mixt. contg. II 79.46, dichlorohydroquinone 12.88, and I 7.66%. A 13.32 g portion of this mixt. was treated with 40 mL Ac2O, refluxed, treated with 0.085 mol terephthalic acid and 0.03 mol 6-acetoxy-2-naphthoic acid, and heated to give, after removal of Ac2O and AcOH by distn., a polyester [90409-90-8] which was melt spun to fibers having (after heat treatment) tenacity 13.8 dN/tex, elongation 4.0%, and modulus 389 dN/tex.

Electroconductive coating materials

Electroconductive coating materials. (Toshiba Corp., Japan). Jpn. Kokai Tokkyo Koho JP 59049272 A2 21 Mar 1984 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C09D005-24; C09D003-54. APPLICATION: JP 82-158887 14 Sep 1982. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) The coatings (for printed circuits) contain 60-90 parts metal powder and 10-40 parts HCHO resin binder plus a hydroquinone contg. 1-3 OH, halogen, or C1-6 alkyl, alkoxy, or acyl groups. Thus, formaldehyde-resorcinol copolymer (PR-RN 1) [24969-11-7] was kneaded with 0.3 g chlorohydroquinone [615-67-8] and 0.3 g hexamine in EtOH and further combined with powd. Cu and Butyl cellosolve to give a coating which was applied by screen printing to a paper-epoxy resin substrate and cured. The elec. resistivity of the coating was 3 ′ 104 W-cm.