Reference

Preparation of modified rubbers

Preparation of modified rubbers. (Hayakawa Rubber Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 58152010 A2 9 Sep 1983 Showa, 5 pp. (Japanese). (Japan).Some commonly used reagents like 26637-80-9 and 5809-08-5 are used in this experiment. CODEN: JKXXAF. CLASS: IC: C08F291-02; C08F004-32. ICA: B29H019-00. ICI: C08F291-02, C08F220-02. APPLICATION: JP 82-33063 4 Mar 1982. DOCUMENT TYPE: Patent CA Section: 39 (Synthetic Elastomers and Natural Rubber) Thermoplastic elastomers are prepd. by graft-polymg. natural rubber, polyisoprene, styrene-butadiene rubber, ethylene-a-olefin copolymer, butyl rubber, and/or reclaimed rubber with acrylic acid or its deriv. in the presence of an org. peroxide with 1 min half-life temp. 190-230° and active O content 8-12% as polymn. initiator, and by mixing and kneading the mixt., and then thermally treating the mixt. Thus, 100 parts reclaimed waste from a butyl rubber inner tube was roll-kneaded at 60° with 30 parts methacrylic acid to which 1 phr 2,5-dimethyl-2,5-bis(tert-butylperoxy)-3-hexyne [1068-27-5] (1 min half-life temp. 193°) was added, followed by further kneading and thermal treatment at 150° for 20 min. The product exhibited high elasticity and a high glass-transition temp. .

Graft-modified copolymer and a compounding agent for a styrene-type polymer containing it

Graft-modified copolymer and a compounding agent for a styrene-type polymer containing it. Nagano, Riichiro; Sagane, Toshihiro (Mitsui Petrochemical Industries, Ltd. , Japan). Eur.Several substances are used for example 28903-35-7 and 88417-81-6 which are their cas registry numbers. Pat. Appl. EP 90418 A2 5 Oct 1983, 20 pp. DESIGNATED STATES: R: DE, FR, GB, IT. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C08F255-02. ICA: C08L025-00. ICI: C08F255-02, C08F212-00. APPLICATION: EP 83-103130 29 Mar 1983. PRIORITY: JP 82-50136 30 Mar 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 39 A graft copolymer is prepd. by grafting 100 parts of a low cryst. or amorphous ethylene-olefin copolymer having C2H4 content 40-93 mol%, melt flow rate (2160 g load, 230°) 0.1-50 g/10 min, and d. ￡0.90 g-cm3, with 0.3-50 parts of a styrene-type hydrocarbon. This copolymer is used as a compounding agent for improving the impact resistance of styrene polymers without decreasing the surface hardness, weathering resistance, and molding properties. Thus, a mixt. of EPR rubber 100, styrene 10, and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 [1068-27-5] 0.2 parts was extruded through an extruder at 200° to give a ethylene-propene-styrene copolymer (I) [25608-79-1] having melt flow rate (2160 g load, 230°) 0.4 g/10 min. A mixt. of polystyrene (II) [9003-53-6] and I to give a wt. ratio II-I .3 was extruded through an extruder at 200° to give a product having impact strength 7.3 kg-cm/cm2 and tensile strength 320 kg/cm2, compared with 4.4 kg-cm/cm2 and 250 kg/cm2 resp., without I. .