Reference

Vulcanizable rubber compositions

Vulcanizable rubber compositions. (Kawaguchi Chemical Industry Co., Ltd.; Bridgestone Tire Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 59213745 A2 3 Dec 1984 Showa, 13 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C08L021-00. ICS: C08K005-37; C08K005-39; C08K005-40. APPLICATION: JP 83-85682 18 May 1983. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) The compns. with excellent aging resistance are based on natural and/or synthetic rubber and contain (A) 31 curing agent of the formula (ZSx)n [Z = (CH2CH2O)1-2CH2CH2; x = 3-6; n = 5-350], (B) 31 vulcanization accelerator of the formula (RR1NCS2)mM (M = Zn, Fe, Te, Se, Bi; R, R1 = alkyl, Ph; RR1 = member of a heterocycle contg. N and another heteroatom; m = 2-4), and (C) benzothiazyl compd. and/or vulcanization accelerator of the formula R2R3NC(S)S1-6C(S)NR2R3 (R2, R3 = alkyl, Ph; R2R3 = member of a heterocycle contg. N and another heteroatom). The compns. are useful for various rubber products, e.g., tires, tubes, vibration insulators, belts, and hoses. Thus, ClCH2CH2OCH2CH2Cl and Na2CS3 were reacted to obtain NaSC(S)SCH2CH2OCH2CH2SC(S)SNa, which was treated with H2SO4 to obtain HSCH2CH2OCH2CH2SH (I). I was reacted with S2Cl2 to obtain (CH2CH2OCH2CH2S4)125 (II) [90352-86-6]. Then, natural rubber RSS #1 100, HAF black 50, process oil R-50 10, ZnO 5, stearic acid 3, N-isopropyl-N-phenyl-p-phenylenediamine 0.5, II 3.9, Te diethyldithiocarbamate (III) [20941-65-5] 0.2, and benzothiazyl disulfide (IV) [120-78-5] 0.5 part were mixed to prep. a title compn., which showed Mooney scorch time (SRIS 3101) ML (125°) 10.8 min, torque value (O. D. R. Test SRIS 3102, 180° MHR) 54 kg.cm, and vulcanization reversion 7.4%, vs. 9.6, 48.8, and 37, resp., for a compn. prepd. by using S and 2-mercaptobenzothiazole instead of II, III, and IV.

Mechanisms of antioxidant action: tellurium dithiocarbamates as antioxidants for polypropylene

Mechanisms of antioxidant action: tellurium dithiocarbamates as antioxidants for polypropylene. Abed-Ali, S.; Ahmed, M. A. K.; McWhinnie, W. R.; Scott, G. (Dep. Mol. Sci., Univ. Aston, Birmingham B4 7ET, UK). J. Appl. Polym. Sci., 32(5), 4857-64 (English) 1986. CODEN: JAPNAB. ISSN: 0021-8995. DOCUMENT TYPE: Journal CA Section: 37 (Plastics Manufacture and Processing) The tetrakis(dialkyldithiocarbamato)tellurium(IV) complexes are highly effective thermal antioxidants and melt stabilizers for polypropylene [9003-07-0] and converted to the bis(dialkyldithiocarbamato)tellurium(II) complexes and the corresponding dithiocarbamoyl disulfides during processing.In this experiment, several chemicals are used like 136-93-6 and 20941-65-5 The Te(IV) complexes are also effective photoantioxidants and their activity increases with increasing processing time. The bischelates are generally less effective when used alone. .