Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1993-02-19
1996-10-08
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 66, 525 68, 525109, 525131, 525132, C08L 3300, C08L 3500, C08L 3700, C08L 5106
Patent
active
055632165
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a thermoplastic resin composition which is excellent in heat resistance and mechanical properties and economical.
DESCRIPTION OF PRIOR ART
In these years, basic and application researches on liquid crystalline polymers have been done vigorously. For instance, a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (Japanese Patent Kokai Publication No. 77691/1979), and a copolymer of p-hydroxybenzoic acid, 4,4'-dihydroxybiphenyl, terephthalic acid and isophthalic acid (Japanese Patent Publication No. 24407/1982) are exemplified. These liquid crystalline polymers have good flowability, heat resistance, stiffness and dimensional accuracy, but are expensive. Therefore, their application fields are limited.
While general-purpose thermoplastic resins are cheaper than liquid crystalline polyesters, the former have less heat resistance and stiffness than the latter. To find new application fields of the thermoplastic resins, it is necessary to improve their properties. As one of methods for improving the properties, blending of a reinforcing material such as calcium carbonate and glass fiber is known. However, since the blending of reinforcing material increases a specific gravity of the resin, a merit of light weight of the resin which is one of the characteristics of the resin is decreased, or a molded article has poor appearance. In addition, a molding machine is heavily abrased during molding. Then, the blend of reinforcing material causes various problems in practical application.
To solve such problems, it is tried to improve flowability and stiffness of the thermoplastic resin by blending the liquid crystalline polyester in the resin. One example is reported by J. Kis in Polym. Eng. Sci., 27 (1987) 410. However, such blend composition has poor compatibility between the liquid crystalline polyester and the thermoplastic resin. Since the thermoplastic resin forms a continuous phase in a composition range in which a ratio of the liquid crystalline polyester is small, the liquid crystalline polyester does not sufficiently exert its excellent properties.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an economical thermoplastic resin composition which has excellent properties of a liquid crystalline polyester though its composition is in a range in which a ratio of the liquid crystalline polyester is small.
The present inventors have extensively carried out researches to develop a thermoplastic resin composition comprising a liquid crystalline polyester and a thermoplastic resin which composition has excellent properties of the liquid crystalline polyester in a composition range in which a ratio of the liquid crystalline polyester is small, and completed the present invention.
Accordingly, the present invention relates to a thermoplastic resin composition comprising (A) a liquid crystalline polyester and a reaction product of (B) a thermoplastic polymer having a crosslinkable functional group and (C) a crosslinking agent, wherein a volume ratio of the polyester (A) to the polymer (B) is from 20:80 to 50:50 and the polyester (A) forms a continuous phase, and a method for preparing the same.
Further, the present invention relates to a thermoplastic resin composition wherein a crosslinked material of the polymer (B) with the crosslinking agent (C) forms a discontinuous phase.
Herein, a reaction between the crosslinkable functional group and the cross linking agent is preferably a condensation reaction or an addition reaction.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a graph showing a storage elastic modulus (G') in a temperature range between room temperature and 300.degree. C., which compares the results 1 (LCP), 2 (Example 1), 3 (Comparative Example 1) and 4 (E-EA-MAh),
FIG. 2 is a graph showing a storage elastic modulus (G') in a temperature range between room temperature and 300.degree. C., which compares the results 1 (LCP), 5 (Example 2), 6 (Comparative Example 2) and 7 (M-HDPE),
FIG. 3 is a graph show
REFERENCES:
patent: 5171778 (1992-12-01), Dekkers
patent: 5324795 (1994-06-01), Suenaga
G. Kiss (1987), Polymer Engineering and Science, 27 (6):410-423.
Dairaku Yukinori
Niwano Masahiro
Short Patricia A.
Sumitomo Chemical Company Limited
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