Reference

Aromatic polyester-polycarbonate blends for molding

Aromatic polyester-polycarbonate blends for molding. (Toyobo Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59157146 A2 6 Sep 1984 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08L067-02; C08K005-09; C08L069-00. ICI: C08L067-02, C08L069-00; C08L069-00, C08L067-02. APPLICATION: JP 83-31523 26 Feb 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) A 30--70 blend of an ethylene terephthalate-based polyester and a polycarbonate contg. 0.005-0.05 phr carboxylic acid (or its deriv.) is easily pelletized and gives a transparent product. Thus, 6:4 blend of poly(ethylene terephthalate) [25038-59-9] (intrinsic viscosity 0.6 in 6:4 PhOH-C2H2Cl4 at 30°) and a polycarbonate (mol. wt. 24,000) was dried at 130°/2 mm for 19 h, dry blended with 0.05 phr pyromellitic anhydride (I) [89-32-7] and kneaded at 280° to give a continuous strand without breaking. A pelletized strand was injection molded to give a sample (thickness 1/8 in) exhibiting transparency 70.6% and haze 51.6% , compared with 48.2% and 82.5%, resp., with discontinuous strand, for a blend not contg. I.

Polyimides from diisocyanates, dianhydrides, and their dialkyl esters

Polyimides from diisocyanates, dianhydrides, and their dialkyl esters. Alvino, William M.; Edelman, Leonard E. (Polymers Plast. Dep., Westinghouse Res. 89-32-7 are also occured in this study. Lab., Pittsburgh, Pa., USA). J. Appl. Polym. Sci., 22(7), 1983-90 (English) 1978. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 36 (Plastics Manufacture and Processing) High mol. wt. polyimides can be produced by the reaction of diisocyanates with a mixt. of arom. dianhydrides and their dialkyl esters. The reaction works well with pyromellitic dianhydride [89-32-7], benzophenone tetracarboxylic dianhydride [2421-28-5] and trimellitic anhydride [552-30-7] and their Me and Bu esters as well as mixts. of these. The polyimides are identical to those prepd. from dianhydrides and diamines. A catalyst is not necessary, but high mol. wt. depends on the anhydride-ester ratio and temp. Tough, flexible films can be prepd. from pptd. and redissolved polymer solns. .