Reference

Esterification of terephthalic acid with 1,4-butanediol

Esterification of terephthalic acid with 1,4-butanediol. (Mitsubishi Chemical Industries Co., Ltd., Japan). Jpn. Tokkyo Koho JP 58050975 B4 14 Nov 1983 Showa, 4 pp. (Japanese). (Japan). CODEN: JAXXAD. 24968-12-5 and 23358-95-4 are cas registry numbers. These chemicals are also mentioned in this article. CLASS: IC: C07C069-82; C07C067-08. ICA: C08G063-16. APPLICATION: JP 75-86326 15 Jul 1975. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Bis(4-hydroxybutyl) terephthalate (I) [23358-95-4] and its oligomers are prepd. from terephthalic acid (II) and 1,4-butanediol (III) [110-63-4] by treating suspensions or solns. of II in I with gaseous III at temps. above the dew point of III. Thus, a 1:1.5 (molar) mixt. of II and III contg. 120 ppm (based on II) (BuO)4Ti was charged at 850 g/h to 700 g of I melt at 240° with strong stirring. The vapor from the reaction mixt. (III, THF, and H2O) was fractionated, and only III was refluxed. The amt. of THF formed was 18 mol % (based on I). The I and its oligomers prepd. after 0.94 h of av. residence time was heated and evacuated in the presence of addnl. 120 ppm (based on I units) (BuO)4Ti to 245° and kept 1.5 h at 245° in vacuo to give copolymer [26062-94-2] having intrinsic viscosity (1:1 PhOH-C2H2Cl4) 1.5 dL/g, good brightness, and CO2H content 39 equiv/109 g. .

Use of liquid crystal polymer particulates having a high aspect ratio in polymeric molding resins to suppress melt dripping

Use of liquid crystal polymer particulates having a high aspect ratio in polymeric molding resins to suppress melt dripping.Some chemicals with cas registry numbers like 24938-64-5 and 25035-37-4 are also used. Kim, Sang N.; Kastelic, John R. (Celanese Corp. , USA). U.S. US 4439578 A 27 Mar 1984, 9 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08L067-02; C08L077-02; C08L077-06. NCL: 524538000. APPLICATION: US 81-319523 9 Nov 1981. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 75 Flame retardant thermoplastic molding compns. are provided contg. high aspect ratio liq. crystal particles which inhibit melt dripping on burning. Thus, 1,4-butanediol-terephthalic acid copolymer [26062-94-2] contg. lyotropic liq. cryst. poly(p-phenylene terephthalamide) [24938-64-5] having particulate aspect ratio 10- 5, Sb2O3 4, and decahydrodiphenyl ether 10% was mixed and molded into test specimens having UL 94 vertical flame rating V-O. .