Reference

Preparation of poly(butylene terephthalate) having few terminal carboxyl groups

Preparation of poly(butylene terephthalate) having few terminal carboxyl groups. (Mitsubishi Chemical Industries Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59086622 A2 18 May 1984 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G063-34; C08G063-30. APPLICATION: JP 82-197358 10 Nov 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Poly(butylene terephthalate) (I) [24968-12-5] is prepd. by using 1,4-butanediol and di-Me terephthalate (or terephthalic acid), where at least stannous oxalate (II) [814-94-8] (as catalyst) is added at the stage before pressure redn. starts for the polycondensation reaction. The resulting polymers have few terminal carboxyl groups. Thus, 44.2 parts di-Me terephthalate and 24.6 parts 1,4-butanediol were mixed and transesterification was carried out in the presence of tetrabutyl titanate [5593-70-4] and II, and then polycondensation was carried out in the presence of Irganox 1010 to obtain I (intrinsic viscosity 0.832) having terminal carboxyl group content 32.4 equiv/106 g, compared with 60.3 when II was omitted.

Radiodiagnostic agents marked with technetium-99m for investigating the liver and the bone marrow

Radiodiagnostic agents marked with technetium-99m for investigating the liver and the bone marrow. (Union Carbide Corp., USA). Belg. BE 853515 12 Oct 1977, 39 pp. (French). (Belgium). CODEN: BEXXAL. CLASS: IC: A61K. APPLICATION: BE 77-853515 12 Apr 1977. DOCUMENT TYPE: Patent CA Section: 63 (Pharmaceuticals) Injectable radioactive visualizing agents, selective for liver and bone marrow, comprise a lyophilized colloid contg. Na phytate [14306-25-3] and stannous oxalate [814-94-8] () recontituted with a 99mTc soln. For example, Na phytate 400 and stannous oxalate 20 mg were mixed in 90 mL of N-purged water. The colloid was filtered (0.22 m), placed in 10 cm3 ampuls, and lyophilized. The ampules were reconstituted with 99mTc soln. (3 cm3) and injected into mice. Of the radioactivity injected 91.3 and 4.3% accumulated in the liver and bone marrow, resp.