Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-01-29
1994-01-11
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
525 66, 525178, 525179, 525180, 525184, C08K 529
Patent
active
052782140
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polyolefin resin composition. More specifically, it relates to a polyolefin resin composition comprising a cycloolefin-based polymer (a), a graft-modified elastomer (b) and an amino compound (c) and being excellent in impact resistance.
TECHNICAL BACKGROUND
Conventional polyolefins are resins excellent in chemical resistance and solvent resistance, but cannot be said to have sufficient rigidity and heat resistance, when their crystallinity is low.
In order to improve polyolefins in heat resistance and rigidity, there is therefore employed a method in which a nucleating agent is added or a polyolefin in a molten state is gradually cooled to increase the crystallinity. However, the effect thereof cannot be said to be satisfactory.
Apart from such conventional polyolefins, it is reported that a copolymer obtained by reaction of ethylene with a bulky monomer is excellent over conventional polyolefins in various properties such as heat resistance, etc. (U.S. Pat. No. 2,883,372 and Japanese Patent Publication No. 14910/1971).
The assignee of the present application already found that a cycloolefin random copolymer obtained by copolymerization of a specific cycloolefin as a bulky monomer and ethylene is excellent in heat resistance, thermal aging resistance, solvent resistance, dielectric properties and rigidity. On the basis of this finding, the assignee of the present application has already proposed inventions of random copolymers obtained from specific cycloolefins (Japanese Laid-Open Patent Publications Nos. 168708/1985, 98780/1986, 115912/1986, 115916/1986, 120816/1986 and 252407/1987).
DISCLOSURE OF THE INVENTION
It is an object of the present invention to further improve such a resin composition containing a cycloolefin-based resin as mentioned above in mechanical properties such as impact strength.
It is another object of the present invention to provide a cycloolefin random copolymer-containing resin composition being further improved particularly in mechanical properties such as impact strength without impairing excellent properties of cycloolefin-based resins.
Other objects and advantages of the present invention will be apparent from the following description. According to the present invention, the above objects and advantages of the present invention are achieved by a polyolefin resin composition comprising: consisting of a homopolymer (a1) derived from one of cycloolefins of the following formula (I), ##STR1## (wherein n is 0 or 1, m is 0 or a positive integer, q is 0 or 1, each of R.sup.1 to R.sup.18, R.sup.a and R.sup.b is, independently of the other, an atom or a group selected from the class consisting of a hydrogen atom, a halogen atom and a hydrocarbon group, or polycyclic group which may have a double bond, and further, a combination of R.sup.15 and R.sup.16 or a combination of R.sup.17 and R.sup.18 may form an alkylidene group), (a3) of the homopolymer (a1) or the copolymer (a2), and a cycloolefin/ethylene random copolymer (a4) composed of a polymer unit derived from said cycloolefins and a polymer unit of ethylene, or a derivative thereof and having a tensile modulus, at 23.degree. C., of 0.1 to 2,000 kg/cm.sup.2, and the total amount of the component (a), the component (b) and the component (c), 50 to 95 parts by weight of the component (a), 1 to 50 parts by weight of the component (b) and 0.01 to 45 parts by weight of the component (c).
The polyolefin resin composition of the present invention basically comprises a cycloolefin-based polymer (a), a graft-modified elastomer (b) and a compound (c) having one amino group in the molecule as described above. The composition of the present invention can provide molded articles being improved particularly in mechanical properties such as impact strength and in surface gloss without impairing excellent properties of cycloolefin-based resins.
The polyolefin resin composition of the present invention will be specifically described hereinafter.
The polyolefin resin composition according to t
REFERENCES:
patent: 4918133 (1990-04-01), Moriya et al.
patent: 5179171 (1993-01-01), Minami et al.
Ishimoto Akio
Moriya Satoru
Takahashi Mamoru
Mitsui Petrochemical Industries Ltd.
Mulcahy Peter D.
Schofer Joseph L.
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