Detail of "17696-62-7"

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Whiskers of poly(4-hydroxybenzoic acid) - preparative aspects

Whiskers of poly(4-hydroxybenzoic acid) - preparative aspects. Kricheldorf, Hans R.Several substances are used for example 17696-62-7 and 26898-17-9 which are their cas registry numbers.; Ruhser, Frank; Schwarz, Gert; Adebahr, Thorsten (Inst. Tech. Makromol. Chem., Univ. Hamburg, Hamburg D-2000/13, Germany). Makromol. Chem., 192(10), 2371-81 (English) 1991. CODEN: MACEAK. ISSN: 0025-116X. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Polycondensation of 4-acetoxybenzoic acid at 300-400° involved side reactions yielding a difficultly hydrolyzed fraction of modified poly(4-hydroxybenzoic acid) (I). Such side reactions included the formation of di-Ph ether groups, Fries-rearrangement, formation of ketene or acetic anhydride, and, possibly, isomerization to 3-hydroxybenzoic acid. These byproducts not only influenced the properties of I, they also affected the crystal growth of needlelike crystals (whiskers). Even small amts. of free 4-hydroxybenzoic acid poisoned the crystal growth of whiskers. The reaction conditions required for their prepn. were optimized at 400°. Fibrous whiskers with lengths 3100 mm and length/diam. ratios >50 were only obtained at low monomer concns. (￡0,05 mol/L). DSC, wide-angle x-ray scattering, and NMR spectroscopy showed that these whiskers were the chem. and phys. most perfect form of I. .

Rubber compositions having improved adhesion to steel or nylon cords

Rubber compositions having improved adhesion to steel or nylon cords. Koyama, Tsuneo; Sugiyama, Yuichi; Mizumoto, Yasuhiro (Yokohama Rubber Co., Ltd., Japan). Japan. Kokai JP 51119744 20 Oct 1976 Showa, 12 pp. (Japanese).Chemical with cas number 5153-25-3 also plays role. (Japan). CODEN: JKXXAF. CLASS: IC: C08L007-00. APPLICATION: JP 75-44354 14 Apr 1975. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Rubber compns. contg. 0.5-20 wt.% (based on rubber) hydroxybenzoate esters are vulcanized in contact with steel [12597-69-2] or nylon cords to increase the rubber-cord adhesion. Thus, a compn. of natural rubber 100, ZnO 5, stearic acid 3, carbon black 40, silica 15, process oil 5, Bu p-hydroxybenzoate (I) [94-26-8] 3, S 3, N-oxydiethylene-2-benzolesulfenamide 0.5, and hexamethylenetetramine 2 parts was rolled and vulcanized 45 min in contact with brass-plated steel cords at 145.degree. to give a vulcanizate having rubber-cord adhesive strength (ASTM D 2229) 104 and 71 kg before and after 24 h of aging at 140.degree., resp., compared with 85 and 60, resp., for a similar compn. without I, and 104 and 70, resp., for a similar compn. contg. resorcinol in place of I which smoked with offensive odor during rolling. .