Reference

Benzothiazyl sulfenamides as scorch retardants for mercaptosilane-coupled silica-filled rubber compounds

Benzothiazyl sulfenamides as scorch retardants for mercaptosilane-coupled silica-filled rubber compounds. Cooper, William T. (Phillips Petroleum Co. , USA). U.S.In this study， 7538-45-6 and 4979-32-2 are also used. US 4430466 A 7 Feb 1984, 7 pp. Cont.-in-part of U.S. Ser. No. 350,685, abandoned. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C08K003-36; C08K003-34; C08K005-54; C08K005-46. NCL: 524083000. APPLICATION: US 82-387097 10 Jun 1982. PRIORITY: US 82-350685 22 Feb 1982. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) The time-to-scorch of S-vulcanizable rubber compds. comprising conjugated diene polymers, siliceous and optionally carbon black fillers, mercaptoalkylalkoxysilane coupling agents, a S curative system, optional extender oils, and 31 benzothiazyl sulfinamide accelerator, is prolonged by increasing the accelerator level to 31.5 parts/100 parts rubber (phr). In addn., the use of 31.5 phr accelerator results in low histeretic heat generation and enhanced resilience in the cured rubber, without impairing its tensile properties. Thus, compns. of SMR-5L rubber 100, Philblack N234 18, silica 40, ZnO 4, stearic acid 2.5, Flexamine 1.0, Flexzone 3C 1.5, Philrich 5 10, S 2, Silane A-189 [4420-74-0] 3, and Santocure [95-33-0] accelerator 2.0-3.0 phr were blended in a Banbury mixer, remilled, dumped at 100°, and cured in a compression mold at 150° for 30 min. The vulcanized compds. had (ASTM D1646) time-to-scorch 5.0-7.5 min, time-to-90%-cure 4.4-4.9 min, Mooney viscosity at 100° 41-52, 300% modulus 13.0-16.4 MPa, tensile strength 27.7-28.5 MPa, elongation 450-540%, hysteretic DT 20.4-21.7°, resilience 71-73%, and Shore A hardness 62-67, compared with 3.2 min, 5.9 min, 60, 11.7 MPa, 24.3 MPa, 510%, 22.3°, 73%, and 57, resp., for a control contg. 1.5 phr accelerator. .

Sterically hindered 2-benzothiazolesulfenamides

Sterically hindered 2-benzothiazolesulfenamides. Koenigshofen, Heinrich; Nierth, Alfred; Finzenhagen, Manfred (Bayer A.-G. , Fed. Rep. Ger.). Ger. Offen. DE 3233395 C1 5 Jan 1984, 4 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C07D277-80. APPLICATION: DE 82-3233395 9 Sep 1982. DOCUMENT TYPE: Patent CA Section: 28 (Heterocyclic Compounds (More Than One Hetero Atom)) The title sulfenamides I (R, R1 = sec-alkyl, cycloalkyl; R2 = H, C1-6 alkyl) were prepd. by reaction of a mercaptobenzothiazole salt II (M = Na, K, 0.5 Ca) with HNRR1 and aq. 4979-32-2 and 101-83-7 which are cas registry numbers of chemicals are mentioned. NaOCl. Thus, treating a mixt. of Me2CHOH, H2O, dicyclohexylamine, and 25% H2SO4 with a mixt. of 50% aq. II (M = Na, R2 = H), 25% H2SO4, and 13% NaOCl at 40° gave 94.8% I (R = R1 = cyclohexyl, R2 = H). .