Detail of "6386-38-5"

Reference

Possible participation of quinolide peroxides in the photooxidation of polymers thermally stabilized by phenols

Possible participation of quinolide peroxides in the photooxidation of polymers thermally stabilized by phenols. Karpukhin, O. N.; Slobodetskaya, E. M. (Inst. Khim. Fiz., Moscow, USSR). Vysokomol. Soedin., Ser. B, 19(7), 488-90 (Russian) 1977. CODEN: VYSBAI. DOCUMENT TYPE: Journal CA Section: 36 (Plastics Manufacture and Processing) The mechanism of the photooxidn. of spatially hindered phenolic heat stabilizers, such as methylox (I) [6386-38-5], in polymers possibly involves the formation of quinolide peroxides (QP) as thermal oxidn. products during the addn. of I to the polymer. Studies with I-stabilized isotactic polypropylene [25085-53-4] prepd. by addn. of I at 110.degree. in a gaseous medium in vacuo showed I degrdn. at wavelengths (.lambda.) >300 nm, although I does not absorb light in that region. The rate of I degrdn. decreased with decreasing residual O pressure during prepn. and increased on preliminary irradn. at .lambda. 254 nm. Apparently, the QP formed during prepn. yield peroxy radicals in the presence of light which react with I, leading to the formation of ortho and para QP, which absorb light at .lambda. 254 and 300 mn, resp., to sensitize the photooxidn.

3,5-Dialkyl-4-hydroxyphenylalkanoic acid esters of polyalkylene glycols

3,5-Dialkyl-4-hydroxyphenylalkanoic acid esters of polyalkylene glycols. Dexter, Martin; Spivack, John D.; Steinberg, David Herbert (Ciba-Geigy Corp., USA). U.S. US 4032562 28 Jun 1977, 5 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C069-76. NCL: 260473000S. APPLICATION: US 71-159020 1 Jul 1971. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Polyalkylene glycol esters with 3,5-dialkyl-4-hydroxyphenylalkanoic acids are useful heat stabilizers and antioxidants for polymers, lubricating oils, vegetable oils, alkylene glycols, and unsatd. compds. Thus, 0.5% methoxytriethylene glycol 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate [39240-47-6], prepd. by treating Me 3-(3,5-di-tert-butyl)-4-hydroxyphenyl)propionate [6386-38-5] with methoxytriethylene glycol [112-35-6], was blended with polypropylene [9003-07-0]. The polymer was milled into sheets which were pressed 7 min at 218.degree./2000 psi to give 25 mil thick pieces having good resistance to aging in a forced draft oven at 150.degree..