Reference

Polymerization of vinyl monomers

Polymerization of vinyl monomers. Koyanagi, Shunichi; Hasegawa, Niichiro; Shimizu, Toshihide; Katsushima, Sensaku; Kaneko, Ichiro (Shin-Etsu Chemical Industry Co., Ltd., Japan). Ger. Offen. DE 2801219 3 Aug 1978, 38 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08F002-00. PRIORITY: JP 77-7100 25 Jan 1977. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) An aq. soln. of an alkali metal or ammonium salt of a water-sol. anionic dye contg. sulfonic and/or carboxylic acid groups was adjusted to pH ￡7 and coated on surfaces in polymn. reactors to minimize the formation of polymer deposits on surfaces during the polymn. of vinyl monomers such as H2C:CHCl and styrene. In some cases, the dye soln. also contained a cationic dye and/or a compd. such as Na silicate, FeCl2, CaCl2, or Cu(OAc)2 [598-54-9]. Forty-nine anionic dyes and 20 basic dyes were used. Thus, a 1% aq. soln. of C.I. Acid Black 2 [8005-03-6] was adjusted to pH 5.0 with H2SO4 and coated (0.1 g solids/m2) on the interior surfaces of a polymn. reactor. The coating was dried at 90° and washed with water. PVC [9002-86-2] did not adhere to the reactor surfaces during suspension polymn.

Studies on the synthesis of poly(1,4-butylene terephthalate) by the direct polycondensation and its properties (Part 1)

Studies on the synthesis of poly(1,4-butylene terephthalate) by the direct polycondensation and its properties (Part 1). Synthesis of poly(1,4-butylene terephthalate) prepolymer by direct esterification. Tanaka, Michihiko; Iida, Hiroshi; Ikeuchi, Hiroyuki; Nakazawa, Shunji; Suganuma, Heiroku; Komatsu, Hideo (Fibers Text. Res. Lab., Toray Ind., Sonoyama, Japan). Sen'i Gakkaishi, 43(1), 67-74 (Japanese) 1987. CODEN: SENGA5.Several reagents such as 598-54-9 is used here. ISSN: 0037-9875. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) The synthesis of poly(butylene terephthalate) [24968-12-5] prepolymer by direct esterification of terephthalic acid (I) with butanediol (II) without a catalyst was impractical, because considerable amts. of THF and water were produced from II by side reactions. Some Ti and Sn compds. were very effective as catalysts for the direct esterification. When a monoalkyl tin compd. was used as a cocatalyst, the catalytic effect of titanates was improved. The effect of pressure, reaction temp., and I-II molar ratio on the formation of THF was also investigated in the presence of catalysts. Optimum conditions for the prepn. of terpolymers [55097-77-3] with isophthalic acid were obtained. .