Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-06-09
1990-04-03
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 92, 525100, 525102, 525103, 525105, C08F 832, C08L 6300, C08L 5302, C08L 8304
Patent
active
049142488
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to coupled diene polymers having an improved processability, strength, elasticity, and other properties, which will not produce toxic, corrosive substances upon working or processing, and having superior characteristics. These diene polymers are used in general for rubber applications as conjugated diene homopolymers or random copolymers of conjugated dienes and aromatic vinyl compounds, and are suitable for use in tire applications such as tire treads with, for example, superior vulcanizate tensile strength, resilience, and heat build-up properties. Further, the diene polymers of the present invention are rubbers exhibiting a low solution viscosity in proportion to their Mooney viscosities. Accordingly, when used as a high impact polystyrene, they provide a superior high impact resistant HIPS formulation rubber with no corrosive effect on equipment. Further, when the diene polymers of the present invention are used as block copolymers of conjugated dienes and aromatic vinyls, even as a thermoplastic elastomer or as a thermoplastic resin, these polymers exhibit a superior cold flow and a well-balanced tensile strength, impact strength, and other properties.
PRIOR ART
The method of causing a reaction between a coupling agent and a diene reactive polymer polymerized in the presence of an organolithium catalyst in an organic solvent to obtain a diene polymer with increased molecular weight has been known heretofore.
For example, a method has been proposed of causing a reaction between a diene reactive polymer, and as a coupling agent, tetrachlorostannous or other polyhalogenated tin compounds (for example, see U.S. Pat. No. 3393182 (Japanese Examined Patent Publication (Kokoku) No. 44-4996)). In this method, however, breakdown of the coupled polymer and a decrease in the molecular weight easily occurred, leading to a deterioration of the polymer properties. Further, a method of causing a reaction of tetrachlorosilane or other polyhalogenated silicon compounds (for example, see U.S. Pat. No. 3,281,383 (Japanese Examined Patent Publication (Kokoku) No. 49-36957) and Japanese Unexamined Patent Publication (Kokai) No. 54-15994), also suffers from the problem of a breakdown of the coupled polymer, although not as great as with tin, and thus a decrease in the molecular weight and a deterioration of the polymer properties. Further, a 1,3,5-tri(bromomethyl)benzene or other polyhalogen-substituted hydrocarbon (for example, see Japanese Examined Patent Publication (Kokoku) No. 49-36957 and U.S. Pat. No. 3,078,254) has been proposed, but these have a low coupling efficiency and do not provide a uniform increase in molecular weight, and thus the problem of a poor performance arises. These are the problems of the prior art. The polyhalogenated compounds all include chlorine ions in the polymers, and in the finishing process, working process, and final application, and because of the halogens remaining in the polymer, are corrosive. In particular, this has a detrimental effect on iron and aluminum.
Therefore, various coupling agents other than halogen type coupling agents have been proposed. For example, the method of causing a reaction with polycarbonic acid esters such as adipic acid diothyl (for example, see U.S. Pat. No. 3,594,452 (Japanese Examined Patent Publication (Kokoku) No. 47-14132), which also suffers from a low coupling efficiency and an inferior performance of the polymer due to the lack of uniform increase of the molecular weight, and further requires the elimination of alcohol produced by the reaction. Further, a method has been proposed of causing a reaction of epoxidized liquid polybutadiene, epoxidized vegetable oil, and other polyepoxides (for example, see U.S. Pat. No. 3,281,383 (Japanese Examined Patent Publication (Kokoku) No. 49-36957)), but a uniform coupling is not obtained and the performance of the obtained polymer is unsatisfactory. In addition, polyisocyanate, polyimine, polyaldehyde, polyketone, polycarboxylic anhydride, etc., have been propo
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patent: 3281383 (1966-10-01), Zelinski et al.
patent: 3926903 (1975-12-01), Scola
patent: 4148771 (1979-04-01), Nash
patent: 4397994 (1983-08-01), Takeuchi et al.
patent: 4680341 (1987-07-01), Newman-Evans
Hattori Yasuo
Kitagawa Yuichi
Saito Akira
Asahi Kasei Kogyo Kabushiki Kaisha
Berman Susan
Bleutge John C.
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