Detail of "15520-11-3"

Reference

Polymerization of vinyl chloride monomers while preventing polymer deposits in the reactor

Polymerization of vinyl chloride monomers while preventing polymer deposits in the reactor. Morningstar, Marion George; Bowles, Robert Lewis (Goodrich, B. F., Co., USA). Ger. Offen. DE 2706706 1 Sep 1977, 24 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08F014-06. PRIORITY: US 76-660063 23 Feb 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) Formation of deposits on the reactor walls in polymn. of vinyl chloride is inhibited by using a water-insol. aliph. peroxydicarbonate as initiator and a combination of water-sol. borohydride or nitrite and water-insol. nigrosine [8005-03-6] as inhibitor, with late addn. of initiator to the reactor which, for optimum deposit prevention, is operated completely full and at alk. pH. Thus, successive addn. of 1930 g H2O, 0.68 g hydroxypropyl Me cellulose, 0.0056 g nigrosine, 0.045 g NaBH4, and 1112 g vinyl chloride to a stirred stainless steel reactor, heating to 56.degree., adding 0.67 g bis(4-tert-butylcyclohexyl) peroxydicarbonate [15520-11-3], and adding H2O to maintain a full reactor during polymn. gave a 75% conversion to PVC [9002-86-2] with no film or sandy deposits on the reactor walls.

Effect of oxygen on the polymerization of vinyl chloride

Effect of oxygen on the polymerization of vinyl chloride. George, M. H.; Garton, A. (Dep. Chem., Imp. Coll. Sci. Technol., London, Engl.). J. Macromol. Sci., Chem., A11(7), 1389-410 (English) 1977. CODEN: JMCHBD. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) A conventional kinetic scheme involving a predominant cross-termination reaction was proposed to explain the dependence of induction period on initial O concn. and initiator concn. in the liq.-phase polymn. of vinyl chloride [75-01-4] at 55.degree. in the presence of bis(4-tert-butylcyclohexyl) peroxydicarbonate [15520-11-3], as studied by tumbled dilatometry. The degree of conversion of the initial O to peroxide compds. was .ltoreq.30% under the exptl. conditions used. Radical decompn. reactions might produce some of the oxidn. products. At 55.degree., the av. velocity const. for decompn. of vinyl chloride polyperoxides in CH2Cl2 soln. was 8 .times. 10-5 s-1 compared with 6.6 .times. 10-5 s-1 for catalyst. The catalyst was also used in a dilatometric study of the homogeneous polymn. of styrene [100-42-5] at 60.degree. and no transfer to catalyst occurred in this system.