Reference

Polymeric carbonates

Polymeric carbonates. Cipriani, Gioacchino; Perrotti, Emilio (SNAM Progetti S.p.A., Italy). Ger. Offen. DE 2265228 2 Dec 1976, 10 pp. Division of Ger. Offen. 2,222,488. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07C069-96. PRIORITY: IT 71-24468 13 May 1971. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) The oligmers (OCO2CH2QCH2)n (I) with av. n = 3.8-4 and Q = CH2, CMe2, or p-C6H4 were prepared by the reaction of CO and O with 1,3-propanediol [504-63-2], neopentyl glycol [126-30-7], or p-xylylene glycol [589-29-7]. Thus, 25 ml 1,3-propanediol contg. 0. 40872-19-3 and 589-29-7 which are cas registry numbers of chemicals are mentioned.1 g Cu2Cl2 was heated 5 h at 80.degree./5 atm in a 2:1 CO-O mixt. diluted with 20% N, and the soln. was extd. with CHCl3 to give 2.03 g I (av. n = 4, Q = CH2) [50862-75-4]. .

Performance of SMC in severe environments

Performance of SMC in severe environments. Grisch, William; Maxel, John (Armco Composites, St. Charles, Ill., USA). Proc., Annu. Conf., Reinf. Plast./Compos. Inst., Soc. Plast. Ind., 32, Sect. 5A, 5 pp. (English) 1977. CODEN: PCRPB6. DOCUMENT TYPE: Journal CA Section: 36 (Plastics Manufacture and Processing) Bisphenol A [80-05-7] based resins give the best corrosion protection, while neopentyl glycol [126-30-7] based resins give less protection. Low profile additives did not show much effect in an acidic environment.There are some commonly used reagents with their cas registry numbers 80-05-7 and 121-91-5 in this article. Clay fillers were satisfactory for basic (caustic) environments. The type of glass fibers did not make any decided difference. Caustic solns. were a more severe environment than acid solns. for sheet molding compds. .