Detail of "6923-52-0"

Reference

Poly(ethylene terephthalate) and catalyst fro its manufacture

Poly(ethylene terephthalate) and catalyst fro its manufacture. Russin, Nicholas Charles; Tershansy, Ronald Alvin; Kibler, Charles Jacob (Eastman Kodak Co., USA). Ger. Offen. DE 2707832 8 Sep 1977, 32 pp. Addn. to Ger. Offen. 2,548,630. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G063-30. PRIORITY: US 76-662672 1 Mar 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) A catalyst system contg. Mn 25-110, Co 10-100, Ti 20-60, Sb 50-300, P 13-240 ppm [based on di-Me terephthalate (I) wt.] is used to manuf. poly(ethylene terephthalate) (II) [25038-59-9] having improved color quality and stability at high prodn. rates. Thus, ethylene glycol (III) solns. of Mn benzoate [17375-29-0], Co(OAc)2 [71-48-7], (iso-PrO)3TiOAc [57567-87-0], and Sb(OAc)3 [6923-52-0] were fed continuously (in individual solns. or combined) into a melt-phase continuous reactor contg. I and II in amts. to give Mn 29, Ti 44, Co 13, and Sb 72 ppm. A phosphate ester color stabilizer of the type (RO)2P(O)(CH2CH2O)nP(O)(OR)2 (R = alkyl, mol. wt. = 771) was added continuously in III soln. after the transesterification step in an amt. to give 75 ppm P. The II obtained under these conditions had Gardner color difference -0.5. II prepd. with similar Mn-Co-Ti-Sb-P catalyst systems had thermal oxidative stability 0.971 (% wt. loss after 6 h at 300.degree., normalized by comparison to a std. sample) and a bathochromic shift which could be regulated. A typical polycondensation in presence of the catalyst systems occurred with an inherent viscosity change per h 0.29.

Kinetics of poly(alkylene terephthalate) formation catalyzed by metal ions

Kinetics of poly(alkylene terephthalate) formation catalyzed by metal ions. Rafler, Gerald; Dunger, Klaus; Reinisch, Gerhard (Inst. Polymerenchem., DAW, Teltow, E. Ger.Some commonly used reagents like 71-48-7 and 27043-73-8 are used in this experiment.). Faserforsch. Textiltech., 27(11), 579-84 (German) 1976. CODEN: FSTXA7. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The kinetics of formation of [-O(CH2)nOCOC6H4CO-]m (n = 2 [25038-59-9], n = 6 [26637-42-3], n = 10 [27043-73-8]) by polymn. of p-C6H4[CO2(CH2)nOH]2 in the presence of metal catalysts [Mn(OAc)2 [638-38-0], Sb(OAc)3 [6923-52-0], Al(OAc)3 [139-12-8], Co(OAc)2 [71-48-7], GeO2] were detd. as a function of n. Differences in reactivity of hydroxyalkyl terephthalates can be explained by inductive effects. A mechanism for metal ion catalysis of polymn. is proposed, based on the dependence of kinetics and heat and entropy of activation on n. .