Reference

2,4,6-Trialkyl-3-hydroxyphenylalkanoates

2,4,6-Trialkyl-3-hydroxyphenylalkanoates. Spivack, John D.; Dexter, Martin (Ciba-Geigy Corp., USA). U.S. US 3988363 26 Oct 1976, 12 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07C069-76. NCL: 260473000S. APPLICATION: US 73-400603 25 Sep 1973. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Esters and amides of 2,4,6-trialkyl-3-hydroxyphenylalkanoic acids were prepd. and used as stabilizers against deterioration by oxidn., heat, and UV light in plastics, rubbers, and oils. A soln. of 97.2 g 6-tert-butyl-3-chloromethyl-2,4-dimethylphenol [23500-79-0] was added to a dispersion of 41 g KCN [151-50-8] in 300 ml DMF at 25-35.degree. the mixt. was heated 7.5 h at 70-5.degree.. An addnl. 13.7 g KCN was added and heating continued 2 h at 60-5.degree. to give 4-tert-butyl-2,6-dimethyl-3-hydroxyphenylacetonitrile (I) [55699-10-0] m. 134-9.degree.. I (65.1 g) was hydrolyzed at 116-17.degree. in ethylene glycol and water contg. NaOH to give 4-tert-butyl-2,6-dimethyl-3-hydroxyphenylacetic acid (II) [55699-12-2] m. 165-7.degree. 9003-53-6 and 23500-79-0 are also in the experiment.. I (43.4 g) was esterified with MeOH to give Me 4-tert-butyl-2,6-dimethyl-3-hydroxyphenylacetate [55698-89-0] which was transesterified with 1,1,1-trimethylolethane [77-85-0] to give neopentanetriyl tris(4-tert-butyl-2,6-dimethyl-3-hydroxyphenylacetate) (II) [55698-90-3] m. 165-7.degree.. Polypropylene [9003-07-0] was blended 10 min at 182.degree. with 0.1% III and 0.3% distearyl .beta.-thiodipropionate and a molded sheet 0.635 m thick was exposed at 150.degree. in a forced draft oven for 1680 h before signs of decompn. occurred. A sheet contg. no stabilizer showed decompn. after 3 h. .

Adjustment of solid-solid phase transition temperature of polyalcohols by the use of dopants

Adjustment of solid-solid phase transition temperature of polyalcohols by the use of dopants. Chandra, D.; Barrett, C.Several substances are used for example 127-09-3 and 126-30-7 which are their cas registry numbers. S.; Benson, D. K. (Univ. Denver, Denver, CO 80208, USA). Adv. X-Ray Anal., 29, 305-13 (English) 1986. CODEN: AXRAAA. ISSN: 0376-0308. DOCUMENT TYPE: Journal CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Section cross-reference(s): 38, 69 The solid state transition temp. of pentaerythritol [115-77-5] and homologous compds. for heat storage was controlled by addn. of substitutional and interstitial dopants in large amts. to form solid solns. The dopants used are trimethylolpropane [77-99-6], NH3, BF3, pentaglycerin [77-85-0], and neopentylglycol [126-30-7]. The plastic crystal polyalcs. can store large amts. of latent heat/unit mass. .