Reference

Vulcanizable acrylate rubbers containing activated esters

Vulcanizable acrylate rubbers containing activated esters. (American Cyanamid Co., USA). Jpn. Kokai Tokkyo Koho JP 59100114 A2 9 Jun 1984 Showa, 6 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08F220-18. ICI: C08F220-18, C08F220-60. APPLICATION: JP 83-206109 4 Nov 1983. PRIORITY: US 82-439669 8 Nov 1982. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Vulcanizable rubbers, e.g. Et acrylate-Me acrylamidomethoxyacetate copolymer (I) [92352-76-6] are prepd. Thus, I 100, carbon black 50, stearic acid 1, and hexamethylenediamine carbamate [143-06-6] were rolled, pressed 10 min at 160°, and aged 70 h at 150° to give a sheet having Shore A hardness 76, tensile strength 1260 psi, and breaking elongation 85%.

Effect of active segments of polymer chains on the reaction of polymers

Effect of active segments of polymer chains on the reaction of polymers. 3. Accelerating effects of the ether group on the covulcanization of epichlorohydrin and its copolymer rubbers. Nakamura, Yoshiro; Mori, Kunio (Dep. Appl. Chem., Iwate Univ., Morioka, Japan). Kobunshi Ronbunshu, 35(7), 449-53 (Japanese) 1978. CODEN: KBRBA3. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) Covulcanization of epichlorohydrin rubber (CHR) and epichlorohydrin-ethylene oxide copolymer rubber (CHC) was investigated by using 2 vulcanizing systems, and the accelerating effect by the ether groups is discussed. Vulcanization by Diak 1 [143-06-6]-Pb3O4 gave a const. rate and a homogeneously vulcanized rubber regardless of the mixing ratios of CHR and CHC, whereas, vulcanization by 6-anilino-1,3,5-triazine-2,4-dithiol (AF) [13733-91-0]-metal oxide, had a rate which was dependent on the mixing ratio, although it also gave a homogeneously vulcanized rubber. The activation energy was the lowest, about 18.1 kcal/mol, for the reaction with the mixing ratio which gave the max. rate. Both the max. rate const. and the mixing ratio to give the max. rate were influenced by metal oxides used as activators. The results are explained by the activation of the AF×Mg formed in the reaction of AF with MgO: the aggregation of the ether groups in CHR and CHC segments forms a Lewis basic field, which acts just like a crown ether and activates the AF×Mg.