Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-02-24
1987-02-24
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525240, 525247, 525268, 525320, 525321, 5263486, C08L 2320, C08L 5300
Patent
active
046457976
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a 3-methylbutene-1 polymer composition having excellent heat resistance, stretchability and mechanical strength of the molded product, such as tear strength and impact strength, and a process for its production.
BACKGROUND ART
3-methylbutene-1 polymers (also called 3-methyl-1-butene polymers) have been known as crystalline polyolefins having high melting points. For instance, Japanese Unexamined Patent Publications No. 182305/1982, No. 195704/1982 and No. 8708/1983 disclose processes wherein 3-methylbutene-1 is polymerized by means of titanium trichloride having a small aluminum content and an organoaluminum compound. While 3-methylbutene-1 polymers obtained by these conventional processes have high melting points, the mechanical strength of the molded products such as tear strength or impact strength and the stretchability are inadequate. Therefore, such products are not necessarily satisfactory as materials for various molded products or as materials for stretched or non-stretched films.
The present inventors have conducted extensive studies with an aim to overcome the above-mentioned various drawbacks, i.e. to improve the stretchability and the mechanical strength of the molded product, without impairing the heat resistance as the feature of 3-methylbutene-1 polymers. As a result, they have arrived at the present invention. Heretofore, such a 3-methylbutene-1 polymer composition and the process for its production have not been known.
DISCLOSURE OF THE INVENTION
The present invention provides a 3-methylbutene-1 polymer composition comprising from 10 to 95% by weight of a 3-methylbutene-1 homopolymer, or a copolymer of 3-methylbutene-1 with other .alpha.-olefin having from 2 to 12 carbon atoms, which has a 3-methylbutene-1 content of higher than 90% by weight, and from 5 to 90% by weight of a copolymer of 3-methylbutene-1 with other .alpha.-olefin having from 2 to 12 carbon atoms, which has a 3-methylbutene-1 content of from 40 to 90% by weight; and a process for producing a 3-methylbutene-1 polymer composition which comprises, in the presence of a transition metal compound and an organometallic compound of a metal of Groups 1 to 3 of the periodic table, polymerizing 3-methylbutene-1, or 3-methylbutene-1 and other .alpha.-olefin having from 2 to 12 carbon atoms, to form a polymer or copolymer having a 3-methylbutene-1 content of higher than 90% by weight in an amount of from 10 to 95% by weight of the total formed polymers, and then copolymerizing 3-methylbutene-1 and other .alpha.-olefin having from 2 to 12 carbon atoms to form a copolymer having a 3-methylbutene-1 content of from 40 to 90% by weight in an amount of from 5 to 90% by weight of the total formed polymers.
BEST MODE OF CARRYING OUT THE INVENTION
Now, the present invention will be described in further detail.
The first component (hereinafter referred to as component (a)) in the polymer composition of the present invention is a 3-methylbutene-1 homopolymer, or a copolymer of 3-methylbutene-1 with other .alpha.-olefin having from 2 to 12 carbon atoms, which has a 3-methylbutene-1 content of higher than 90% by weight. As such other .alpha.-olefin having from 2 to 12 carbon atoms in the copolymer, there may be mentioned ethylene, propylene, butene, hexene, 4-methylpentene-1, octene, styrene or vinylcyclohexane. These other .alpha.-olefins may be employed in combination of two or more, and may further contain a small amount of a polyene such as butadiene or isoprene. The method for copolymerization is preferably a so-called random copolymerization method. The 3-methylbutene-1 content in the copolymer is higher than 90% by weight, preferably at least 95% by weight. If the content is outside this range, the melting point of the composition tends to be low, and the features of the 3-methylbutene-1 polymer such as a high melting point and solvent resistance tend to be impaired, such being undesirable.
The proportion of component (a) in the composition is from 10 to 95% by weight, preferably fr
REFERENCES:
patent: 3544662 (1970-12-01), Polestak et al.
patent: 3692712 (1972-09-01), Crouch et al.
patent: 4146591 (1979-03-01), Fukui et al.
patent: 4454306 (1984-06-01), Fujii et al.
Enokido Nobuo
Maruyama Yasuo
Suga Yoshinori
Tanaka Eiji
Mitsubishi Chemical Industries Ltd.
Seccuro Carman J.
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