Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-04-23
2000-08-08
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08L 7706
Patent
active
061003476
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an olefin base resin composition that has excellent mechanical properties, scratch resistance, heat resistance and moldability. More specifically, it relates to a composition comprising a crystalline olefin base resin and a polymer prepared by vinylene polymerization of a cyclic olefin and having a high elastic modulus, heat resistance and surface hardness.
DESCRIPTION OF THE RELATED ART
Crystalline olefin base compositions such as polyethylene and polypropylene are widely used because of their good cost-performance balance. In order to satisfy performance requirements for various uses, raising their performances by methods such as blending a filler or an elastomer or polymer-alloying with engineering plastics has been attempted. In recent years, there has been a strong demand for an increase in the rigidity of the materials themselves in order to decrease the thicknesses of resin parts to achieve on accompanying reduction in weights thereof, particularly for car parts, for the purpose of improving fuel consumption. Further, an improvement in scratch resistance which is a weak point of olefin resins is required as well.
With conventional techniques, however, there have been the problems shown below.
That is, when a filler is blended with an olefin resin, although the rigidity thereof is increased while maintaining the characteristics of the olefin resin such as moldability and low specific gravity it the filler amount is small, the improvement in rigidity is limited. On the other hand, blending a large amount of a filler in order to raise the rigidity brings about a reduction in the flowability and moldability of the composition and not only damages the characteristics of the olefin resin, but also does not meet the goal of decreased weight due to an increase in the specific gravity. This has led to the requirement for improving the rigidity of the olefin resin itself which is a base.
Also, when alloying olefin resins with various engineering plastics, expensive engineering plastics have to be added in large quantities to obtain an increase in the rigidity, and a compatibility-accelerating agent (compatibiliser) is required in many cases. Accordingly, the characteristic of low cost accorded to olefin resins is canceled. Further, polar groups contained in engineering plastics and the compatibility-accelerating agents cause coloring of the compositions and, in certain cases, cancel the good hue accorded to olefin resins. In addition, the defect of scratching resistance still remains as long as olefin resins are the matrices.
Many studies have been made in which alicyclic oligomers such as a petroleum resin and a hydrogenated petroleum resin were added to olefin resins for the purposes of increasing elastic modulus and transparency (Japanese Patent Publication No. 41-7958, Japanese Patent Publication No. 49-30263, Japanese Patent Laid-open No. 47-22449, Japanese Patent Laid-open No. 50-116536, Japanese Patent Laid-open No. 55-86830 and Japanese Patent Laid-open No. 63-35642). In these compositions, however, while the elastic moduli are elevated at around room temperatures, the rigidities reduce suddenly at temperatures exceeding the glass transition points of the added alicyclic oligomers as low as 50 to 100.degree. C., and the heat resistances accorded to olefin resins deteriorate to a large extent (refer to Comparative Examples 4 to 6).
Further, many studies have been made in which the copolymers of cyclic olefins with .alpha.-olefins were blended with olefin resins to thereby improve the mechanical properties such as elastic modulus (Japanese Patent Laid-open No. 1-318052, Japanese Patent Laid-open No. 3-210348, Japanese Patent Laid-open No. 4-353540, Japanese Patent Laid-open No. 5-51413, Japanese Patent Laid-open No. 5-262898, Japanese Patent Laid-open No. 6-41361 and Japanese Patent Laid-open No. 6-316660). With these methods, however, the elastic moduli were elevated only at low rates, and improvement in the surface hardness was not observed (
Kumano Yuuta
Nisizawa Osamu
Onoe Masato
Takasaki Kenji
Boykin Terressa M.
Mitsubishi Chemical Corporation
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