Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1991-11-12
1993-06-15
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526339, 5263482, 5263483, 5263486, C08F23600
Patent
active
052199681
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a propylene copolymer, and more specifically, it relates to a copolymer comprising propylene and a specified cyclic diolefin or alkadiene and having a substantially syndiotactic structure.
BACKGROUND ART
It has been known for a long period of time that a syndiotactic polypropylene is prepared by polymerizing propylene at a low temperature in the presence of a catalyst comprising a vanadium compound and an organic aluminum. However, the polymer prepared by the conventional process is poor in syndiotacticity, and it is scarcely considered that the thus prepared polymer exerts inherent characteristics of the syndiotactic polypropylene.
In J. A. Ewen et al., J. Amer. Chem. Soc., Vol. 110, 6255-6256 (1988), there are disclosed a highly syndiotactic polypropylene and its preparation method. However, the syndiotactic polypropylene described in the J. A. Ewen et al. literature has good physical properties in the manufacture of molded articles, but it is low in adhesiveness and dyeability and has poor moldability.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a novel propylene copolymer.
Another object of the present invention is to provide a method for preparing the above-mentioned propylene copolymer.
Other objects of the present invention will be apparent from the undermentioned description.
A propylene copolymer of the present invention having a substantially syndiotactic structure is a copolymer comprising the repeating units of propylene and the repeating units of at least one diene selected from the group consisting of cyclic diolefins having 6 to 25 carbon atoms and alkadienes having 6 to 25 carbon atoms and at least one terminal double bond; the content of the repeating units of the diene being from 0.01 to 20 mol %; in the .sup.13 C-NMR spectrum of the copolymer measured in a 1,2,4-trichlorobenzene solution, a peak intensity observed at about 20.2 ppm as the reference of tetramethylsilane being 0.5 or more of the total peak intensity attributed to methyl groups of propylene; the intrinsic viscosity of the copolymer measured in a tetralin solution at 135.degree. C. being from 0.1 to 10 dl/g.
The propylene copolymer having the syndiotactic structure can be obtained by copolymerizing propylene and at least one diene selected from the group consisting of cyclic diolefins having 6 to 25 carbon atoms and alkadienes having 6 to 25 carbon atoms and at least one terminal double bond in the presence of a transition metal compound represented by the formula ##STR1## (wherein A and B are mutually different cyclic unsaturated hydrocarbon residues, R is a hydrocarbon residue having 1 to 20 carbon atoms or a group containing silicon or germanium which connects A with B, X is a halogen atom or a hydrocarbon residue having 1 to 20 carbon atoms, and M is a metal atom selected from the group consisting of titanium, zirconium and hafnium) and a co-catalyst.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an infrared absorption spectrum of a 0.5-mm-thick copolymer sheet obtained in Example 1,
FIG. 2 is a .sup.1 H-NMR spectrum, which was measured in a benzene-d.sub.6 solution, of a copolymer obtained in Example 1,
FIG. 3 is an infrared absorption spectrum of a 0.5-mm-thick copolymer sheet obtained in Example 2,
FIG. 4 is a .sup.1 H-NMR spectrum, which was measured in a benzene-d.sub.6 solution, of a copolymer obtained in Example 2,
FIG. 5 is an infrared absorption spectrum of a 0.5-mm-thick copolymer sheet obtained in Example 3,
FIG. 6 is a .sup.1 H-NMR spectrum, which was measured in a benzene-d.sub.6 solution, of the copolymer obtained in Example 3,
FIG. 7 is an infrared absorption spectrum of a 0.5-mm-thick polymer sheet obtained in Comparative Example 1,
FIG. 8 is an infrared absorption spectrum of a 0.7-mm-thick copolymer sheet obtained in Example 7,
FIG. 9 is an infrared absorption spectrum of a 0.7-mm-thick polymer sheet obtained in Comparative Example 2,
FIG. 10 is a .sup.1 H-NMR spectrum, which was measured in a benzene-d.sub.6 solut
REFERENCES:
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5026798 (1991-06-01), Canich
patent: 5084534 (1992-01-01), Welborn, Jr. et al.
Asanuma Tadashi
Fukushima Satoshi
Inoue Norihide
Iwatani Tutomu
Kouno Masashiro
Mitsui Toatsu Chemicals Inc.
Schofer Joseph L.
Wu David
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