Reference

Phenolic antioxidants

Phenolic antioxidants. Mayer, Norbert; Pfahler, Gerhard; Wiezer, Hartmut (Hoechst A.-G., Ger.). Ger. Offen.There are some reagents like 64960-84-5 is used in this study.There are some reagents like 64960-84-5 is used in this study. DE 2612214 6 Oct 1977, 12 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07C069-74. APPLICATION: DE 76-2612214 23 Mar 1976. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Section cross-reference(s): 25 The phenol derivs. I with R = H or CMe3, R1 = iso-Pr, Et, or octadecyl, m = 1 or 2, and n = 0 or 2 were prepd. for use as antioxidants in synthetic polymers. Thus, a mixt. of 103.5 g isopropyl 3-(2-oxocyclohexyl)propionate [64960-84-5], 600 g o-tert-butylphenol [88-18-6], and 32 mL dodecyl mercaptan was treated at 5° with HCl for 16 h to prepare 165 g I (R = H, R1 = iso-Pr, m = 2, n = 2) [64960-78-7]. ..

Stabilized polyoxyalkylene polyether polyols and polyurethane foams prepared therefrom

Stabilized polyoxyalkylene polyether polyols and polyurethane foams prepared therefrom. Statton, Gary L.; Gaul, James M. (Atlantic Richfield Co., USA). U.S. US 4444676 A 24 Apr 1984, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08G018-14; C07L041-12. NCL: 252182000. APPLICATION: US 83-481215 1 Apr 1983. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Polyoxyalkylene polyether polyols are stabilized against oxidative degrdn. by incorporating therein a synergistic stabilizing compn. consisting of (a) 9-95% of a mixt. of butylated phenols comprising 25-85% 2-tert-butylphenol (I) [88-18-6], 10-65% methyl-3,5-di-tert-butyl-4-hydroxyhydrocinnamate (III) [6386-38-5] and 5-25% 1,6-hexamethylenebis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate (III) [35074-77-2] or tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]metha ne (IV) [6683-19-8], and (b) 9-95% over p,p'-C3-18-dialkyldiphenylamine, and (c) 0.0010-15% of a phenothiazine compd. Polyurethane foams are stabilized against scorching when the stabilized polyols are utilized and the foam prepn. or the stabilizing compn. is added with other reactants. Thus, a polyether polyol (mol. wt. 3000) was stabilized with 0.25% of a compn. contg. 45% I, 45% II, and 10% III, 0.20% p,p'-dioctyldiphenylamine (V) [101-67-7], and 0.01% phenothiazine (VI) [92-84-2], or alternatively, 0.25% of a compn. contg. 50% I, 25% II, and 25% IV, 0.20% V, and 0.02% VI. The stabilized polyether polyol had a decompn. temp. under O of 209-213° vs. 160° for a polyether polyol contg. no stabilizers.