Reference

Manufacture of polyesters

Manufacture of polyesters. (Diafoil Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59096124 A2 2 Jun 1984 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G063-22; C08G063-68. APPLICATION: JP 82-205254 22 Nov 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Ethylene glycol (I) [107-21-1] soln. contg. 31 OP(OR)(OR1)OR2 (R, R1, R2 = C1-4 alkyl), which is the distillate obtained in polyester manufg. process, is heat-treated in the presence of water (0.2-10% of I), and distd. to recover I, which is recycled for polyester manuf. Thus, di-Me terephthalate 100, I 68, and Ca(OAc)2.H2O 0.1 part were heated at 225° for 4 h to obtain a transesterification product, which was mixed with a soln. from triethyl phosphate (II) [78-40-0] 0.2, Et3PO3 0.05, and I 2 parts and reacted in the presence of 0.04 part Sb2O3 to obtain poly(ethylene terephthalate) (III) [25038-59-9]. During the reaction, 40 parts I soln. contg. 1800 ppm II was recovered, and the soln. was mixed with 1.2 parts water, heated at 170° for 3 h to reduce II content to 36 ppm, and distd. to give 36 parts pure I, which was mixed with 36 parts fresh I and used in the 2nd batch of III manuf. to obtain polyester with characteristics comparable to those of products prepd. without using the recycled I.

Low-melting inorganic composition

Low-melting inorganic composition. Maikuma, Tateki (Matsushita Electric Works, Ltd., Japan). Japan. Kokai JP 52041636 31 Mar 1977 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C04B019-00. APPLICATION: JP 75-118458 30 Sep 1975. DOCUMENT TYPE: Patent CA Section: 58 (Cement and Concrete Products) Low-m. inorg. compns. are obtained by reacting H3PO4 with Al2O3 and/or hydrated Al2O3, alkali metal (M), and Group II metal (M') in such amts. satisfying Al3+/PO43- 1/7-7/10, M+/PO43- 0.1-0.2, M'2+/Po43- 1/7-7/10, and (M1+ + 3M'2+ + 3Al3+)/3PO43- 1/3-1. The inorg. compns. have good moldability like plastics and are useful for manuf. of heat-resistant products. Thus, a mixt. contg. 693 85% H3PO4 and 18.2 g Et3PO4 [78-40-0] was reacted with 244.2 g ZnO for 1 h, mixed with 156 g Al(OH)3, reacted for 1 h, reacted with 40 g NaOH at 100-110.degree. for 30 min, dried at 100.degree. for 10 h, and crushed to obtain a powder, m. 130-5.degree.. The powder was molded at 140.degree. and 20 kg/cm2 for 3 min to give a 50-mm-diam. disk.