Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1997-04-10
2001-02-27
Yoon, Tae (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S437000, C524S604000, C528S272000
Reexamination Certificate
active
06194524
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high heat-resistant thermoplastic resin composition which is superior in mechanical physical properties and stress crack resistance.
2. Description of the Related Art
Engineering plastics represented by polyamide, polyacetal and polyphenylene oxide resins and modifications thereof, polybutylene terephthalate resin, etc. are superior in heat resistance and strength to general-purpose resins such as polyethylene, polypropylene, polyvinyl chloride, ABS and the like. Therefore, they are widely used for applications such as automobile parts, electrical appliances, OA equipment, precision instruments, electric/electronic parts and the like.
However, most of the performance characteristics required for the various above applications can not be achieved by a single resin material. Therefore, in order to obtain a molding material which simultaneously satisfies physical properties which are contrary to each other (e.g. high impact properties and high rigidity), there is widely known a technique of blending or polymer-alloying different kinds of resins to obtain the desired physical properties.
In general, different kinds of resins are sometimes incompatible each other and, therefore, both resins form a crude phase separation structure wherein a sea/island structure is disordered in case of simply melt-kneading and the desired physical properties are sometimes not attained. Therefore, a compatibilizing agent is used for accomplishing fine dispersion of a resin component which converts into an island phase.
This compatibilizing agent is a compound or high-molecular weight material having affinity for two or more kinds of resins to be compatibilized or having a function of reacting chemically with them, and stabilizes an interface between different kinds of resins and contributes to fine dispersion of the island phase.
For example, Japanese Patent Kokai (Laid-Open) No. 56-26913 discloses that, by mixing a compound having a polar group such as carboxylic group, acid anhydride group, etc. where a polymer alloy of a polyphenylene oxide resin and polyamide is produced, a composition is obtained whose impact resistance and solvent resistance are extremely improved while the heat resistance of the polyphenylene oxide is maintained.
Japanese Patent Kokai (Laid-Open) No. 61-120855 discloses that the impact resistance and tensile elongation are extremely improved by adding a silane derivative to a polymer alloy prepared by formulating a rubber to a polyphenylene oxide resin and polyamide.
Japanese Patent Kokai (Laid-Open) No. 56-115355 discloses that a composition whose impact resistance is extremely improved is obtained by formulating a styrene-butadiene block copolymer modified with maleic anhydride to one or more engineering plastics such as polyacetal, polycarbonate and the like.
Japanese Patent Kokai (Laid-Open) No. 59-58052 discloses that the bending strength, impact resistance and hydrolysis resistance are improved by formulating an epoxy resin to a polymer alloy of a polyphenylene sulfide resin and a thermoplastic polyester resin.
In application where heat resistance is required, polymer-alloying due to combinations having high heat resistance is required. Therefore, polymer-alloying due to comparatively high heat-resistant resins, for example, polyphenylene sulfide resin and polyarylate, polysulfone, polyphenylene oxide resin, polyether ketone, thermoplastic polyimide, etc. is studied in Japanese Patent Kokai (Laid-Open) No. 59-164360. This publication discloses that the bending strength and impact resistance of a composition prepared by formulating an epoxy resin in the case of producing the polymer alloy are extremely improved in comparison with a composition prepared by formulating no epoxy resin.
However, a processing temperature exceeding 300° C. is sometimes required when a polymer alloy containing such a high heat-resistant resin as a component is produced and the resulting polymer alloy composition is molded. Therefore, compounds or high-molecular weight materials formulated as the compatibilizing agent cause heat deterioration during the production of the polymer alloy or at the time of molding the resulting composition, thereby causing problems such as inhibition of a function as the compatibilizing agent, deterioration of physical properties of the composition, etc.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a thermoplastic resin composition having high strength, high heat resistance and excellent stress crack resistance, which can be suitably used for applications such as parts for automobile, aircraft, etc., industrial equipment, electrical appliances, OA equipment, electric/electronic parts, etc.
The present inventors have intensively studied to solve the above problems. As a result, the above object is accomplished by adding 1 to 100 parts by weight of a polyester having a specific structure in the case of producing a polymer alloy of a high heat-resistant thermoplastic resin. Thus, the present invention has been completed.
That is, the present invention is as follows.
(1) A thermoplastic resin composition comprising 100 parts by weight of two or more thermoplastic resins and 0.1 to 100 parts by weight of a polyester having the following structure, the polyester being added to the thermoplastic resins, wherein a glass transition temperature determined by using DSC (differential scanning calorimeter) is not less than 50° C. and/or a deflection temperature under load (load: 1.82 MPa) is not less than 70° C.:
polyester composed of a repeating unit represented by the formulas:
(wherein X is one or more selected from —SO
2
—, —CO—, —O—, —S—, —CH
2
—, —CH
2
—CH
2
—, —C(CH
3
)
2
— and single bond; R
1
represents an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 3 to 10 carbon atoms, a phenyl group or a halogen atom; p represents an integer of 0 to 4; m and n represent an integer of 1 to 4; and a plurality of R
1
on the same or different nuclei may be different each other and each p may be different each other), which satisfies the following expressions:
0≦(I)≦95 (mol %), (II)+(III)=100−(I) (mol %),
0.9≦(II)/(III)≦1.1.
(2) The thermoplastic resin composition according to the term (1), wherein X is —SO
2
— and/or —C(CH
3
)
2
— in the repeating unit II of the polyester.
(3) The thermoplastic resin composition according to the term (1) or (2), wherein the deflection temperature under load of at least one thermoplastic resin is not less than 150° C.
(4) The thermoplastic resin composition according to the term (1) or (2), wherein at least one thermoplastic resin is polyarylate, liquid crystal polyester, polysulfone, polyethersulfone, polyether ether ketone or polyether imide.
(5) The thermoplastic resin composition according to the term (1) or (2), wherein at least one thermoplastic resin is a liquid crystal polyester.
(6) The thermoplastic resin composition according to the term (1) or (2), wherein the liquid crystal polyester contains at least 30 mol % of a repeating unit represented by the formula I.
DETAILED DESCRIPTION OF THE INVENTION
Regarding the thermoplastic resin used in the present invention, the glass transition temperature measured by using DSC according to ASTM D3418 is not less than 50° C. and/or a deflection temperature under load (load: 1.82 MPa) measured according to ASTM D648 is not less than 70° C. When using the thermoplastic resin having the glass transition temperature of less than 50° C. or deflection temperature under load of less than 70° C., the desired high heat-resistant engineering plastic material of the present invention is not obtained, and it is not preferred.
Examples of the thermoplastic resin include polyacetal, polyamide 66, polyamide 610, polyamide 612, polyamide 46, polyamide 6T, polyamide MXD6, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polycyclohexyl terephthalate, polyarylate, liquid crystal polyester, liquid
Nagashima Tohru
Nomura Hideo
Birch & Stewart Kolasch & Birch, LLP
Sumitomo Chemical Company Limited
Yoon Tae
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