Reference

Hindered phenol amines

Hindered phenol amines. Robin, Michael; Schulte, Sheldon R. (Ashland Oil, Inc., USA). U.S. US 4028416 7 Jun 1977, 3 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C087-28. NCL: 260570500P. APPLICATION: US 72-226236 14 Feb 1972. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Hindered aminophenols, useful as antioxidants for polymers, are prepd. Thus, polyethylene [9002-88-4] contg. 0.1% N,N'-di(3-tert-butyl-2-hydroxy-5-methylphenyl)methyldiaminoethane (I) [63551-07-5], prepd. by reaction of 2-tert-butyl-4-methylphenol [2409-55-4], ethylenediamine [107-15-3], and formaldehyde [50-00-0], had 410 h as time to reach 94% absorbence at 5.8 .mu., compared with 50 h for a sample contg. no I and 130 h for a sample contg. 2,2'-methylenebis(6-tert-butyl-4-methylphenol) instead of I.

Stabilizing polyurethane polymer compositions against light, heat and atmospheric decomposition

Stabilizing polyurethane polymer compositions against light, heat and atmospheric decomposition. Buysch, Hans J.; Oertel, Harald; Roos, Ernst (Bayer A.-G., Ger.). Ger. Offen. DE 2523107 9 Dec 1976, 33 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08K005-05. APPLICATION: DE 75-2523107 24 May 1975. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Section cross-reference(s): 25 A mixt. of .alpha.,.alpha.'-bis(2-hydroxy-3,5-dimethylphenyl)-p-diisopropylbenzene (I) [34074-95-8] and .alpha.,.alpha.'-bis(2-hydroxy-3,5-dimethyl)-m-diisopropylbenzene (II) [61660-45-5] and 2 similar mixts. 7647-01-0 which is the cas registry number is also used here. of isomers were used as light and heat stabilizers for polyurethanes such as spandex fibers. The isomer mixts. were prepd. by the reaction of a mixt. of .alpha.,.alpha.'-dihydroxy-m-diisopropylbenzene [1999-85-5] and .alpha.,.alpha.'-dihydroxy-p-diisopropylbenzene [2948-46-1] with 2,4-dimethylphenol [105-67-9], o-cyclohexyl-p-cresol [1596-09-4], or 2-tert-butyl-p-cresol [2409-55-4], and high yields were obtained by satg. the phenol deriv. with HCl and adding the isomer mixt. Thus, spandex fibers contg. 2% 2:3 I-II mixt. were stable during 180 s at 180.degree. or during 340 h irradn. in a Xenotest app. .