Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1997-06-26
2000-03-21
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526159, 526348, 585 23, 585600, C08F 1002
Patent
active
060404078
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel chain polyene group-containing norbornene compound and a process for preparing the compound. More particularly, the invention relates to a chain polyene group-containing norbornene compound suitably used for preparing a novel unsaturated ethylene copolymer being excellent in weathering resistance, heat resistance and ozone resistance and having a high vulcanizing rate, and to a process for preparing the compound.
Further, the invention relates to a novel unsaturated ethylene copolymer of the above properties using the chain polyene group-containing norbornene compound and to a process for preparing the copolymer.
Furthermore, the invention relates to a rubber composition containing the unsaturated ethylene copolymer.
BACKGROUND ART
Polyene compounds generally are compounds (monomers) having two or more carbon-to-carbon double bonds in one molecule, and many polyene compounds, e.g., 1,3-butadiene, 1,3-pentadiene, 1,4-hexadiene, ethylidene-2-norbornene and dicyclopentadiene, have been hitherto known.
When the polyene compounds are copolymerized with .alpha.-olefins such as ethylene and propylene, vulcanizable unsaturated ethylene copolymers can be obtained. Since the unsaturated ethylene copolymers generally have excellent weathering resistance, heat resistance and ozone resistance, they have been used for rubber products such as automotive industrial parts, industrial rubber products, insulating materials, building and civil engineering materials, and rubberized fabrics. Moreover, they have been widely used as blending materials for plastics such as polypropylene and polystyrene.
Examples of the unsaturated ethylene copolymers conventionally used include an ethylene/propylene/5-ethylidene-2-norbornene copolymer, an ethylene/propylene/dicyclopentadiene copolymer and an ethylene/propylene/1,4-hexadiene copolymer. Of these, the ethylene/propylene/5-ethylidene-2-norbornene copolymer has been particularly widely used, because it has a higher vulcanizing rate as compared with other unsaturated ethylene copolymers.
However, the conventional unsaturated ethylene copolymers are now desired to be further improved in the vulcanizing rate. That is, the unsaturated ethylene copolymers, for example, even the ethylene/propylene/5-ethylidene-2-norbornene copolymer, are low in the vulcanizing rate as compared with diene rubbers such as natural rubbers, styrene/butadiene rubber, isoprene rubber, butadiene rubber and nitrile rubber. Therefore, the co-vulcanizability of the unsaturated ethylene copolymers with the diene rubbers is insufficient.
Further, the vulcanizing rate of the unsaturated ethylene copolymers is lower than that of the diene rubbers, so that it is difficult to prepare vulcanized rubbers therefrom with high productivity by shortening the vulcanizing time, lowering the vulcanizing temperature or reducing the energy consumption in the vulcanization stage.
The vulcanizing rate of the unsaturated ethylene copolymers can be increased by increasing the amount of a vulcanizing agent used. However, if the unsaturated ethylene copolymers are vulcanized using a large amount of a vulcanizing agent, the vulcanizing agent sometimes blooms onto the surface of the resulting vulcanized rubbers, resulting in hygienic disadvantages.
Accordingly, development of a novel polyene compound capable of preparing an unsaturated ethylene copolymer being excellent in weathering resistance, heat resistance and ozone resistance and having a high vulcanizing rate, and development of an unsaturated ethylene copolymer using the polyene compound have been desired.
Under such circumstances mentioned above, the present inventors have earnestly studied polyene compounds and unsaturated ethylene copolymers using the polyene compounds. As a result, they have found that an unsaturated ethylene copolymer using a specific chain polyene group-containing norbornene compound, i.e., an unsaturated ethylene copolymer having constituent units derived from an .alpha.-olefin and a specific chain po
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Ishida Tatsuyoshi
Kawasaki Masaaki
Kihara Noriaki
Nakahama Hidenari
Onishi Hitoshi
Lu-Rutt Caixia
Mitsui Petrochemical Industrial, Ltd.
Wu David W.
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