Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-08-09
1998-05-12
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...
525133, 525146, 525165, 525166, 525178, 525179, 525189, C08L 2712, C08L 6703
Patent
active
057506264
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a thermoplastic resin composition which comprises a specific fluorine-containing polymer having a functional group and a thermoplastic resin having a crystalline melting point or glass transition temperature of not less than 150.degree. C., and has improved mechanical and chemical properties.
BACKGROUND ARTS
Heat resisting crystalline thermoplastic resins (having a crystalline melting point of not less than 150.degree. C.) such as polyacetals, polyamides, aromatic polyesters, polyallylene-sulfides, polyketones, polyether ketones, polyamide imides and polyether nitrites are excellent in mechanical properties and moreover moldability, and therefore are used for functional parts for automobiles, industrial machineries, office automation equipments, and electrical and electronic equipments. Meanwhile there is a market demand for higher chemical resistance, sliding properties and the like, and particularly impact resistance is desired to be enhanced because those resins are generally brittle. Also, heat resisting amorphous thermoplastic resins (having a glass transition temperature of hot less than 150.degree. C.) such as polycarbonates, polyphenylene ethers, polyalylates, polysulphones, polyether sulphones, and polyetherimides are widely used for making the best use of transparency, dimensional stability, impact resistance, and the like, but generally there are problems with chemical resistance, solvent resistance and moldability.
Fluorine-containing resins such as polytetra-fluoroethylene (PTFE), tetrafluoroethylene/perfluoro-alkyl vinyl ether copolymer (PFA), tetrafluoroethylene/hexafluoropropylene copolymer (FEP), polyvinylidene fluoride (PVDF) and ethylene/tetrafluoroethylene copolymer (ETFE) are excellent in thermal resistance, chemical resistance, solvent resistance, weather resistance, sliding properties, pliability, electrical properties and the like, and are widely used for automobiles, industrial machineries, office automation equipments, electrical and electronic equipments, and the like. However, there are many cases where those resins are inferior in mechanical properties and physical thermal resistance as represented by a deflection temperature under load, as compared with heat resisting crystalline thermoplastic resins, and the uses thereof are within the limited range because the dimensional stability is inferior as compared with heat resisting amorphous thermoplastic resins.
Attempts have been actively made to obtain novel materials by combining a fluorine-containing polymer (including resinous and elastomeric form) with the aforementioned heat resisting thermoplastic resins having no fluorine to modify such resins to eliminate disadvantages of the resins, and on the contrary by combining mainly a resinous fluorine-containing polymer with the heat resisting thermoplastic resin having no fluorine to moldify such polymers.
First, as an example for simply melting and blending by the use of a kneading machine, JP-A-202344/1982 discloses that a fluorine-containing elastomer commercially available is added to improve impact resistance, crack resistance and strength against thermal shock without imparing properties of polyallylene sulfides such as thermal resistance, chemical resistance, and the like. Also, JP-A-165647/1989 and JP-A-110156/1990 disclose that a polymer, that is to say, a liquid crystal polymer (aromatic polyester or the like) forming an anisotropic melt is added to decrease a coefficient of linear expansion without impairing weather resistance, chemical resistance, wear resistance and anti-soil property of a fluorine-containing polymer such as a PVDF and further to improve mechanical properties and moldability. As examples of a blend of a liquid crystal polymer and a PTFE, there are JP-B-5693/1992 and JP-A-230756/1988. JP-A-7850/1975 discloses that it is effective to blend the PVDF for improving water absorption and hygroscopicity of polyamides.
Furthermore, JP-A-23448/1985 discloses an example that a property of release from a mold
Araki Takayuki
Kumegawa Masahiro
Shimizu Tetsuo
Tsuda Nobuhiko
Yamaguchi Seitaro
Daikin Industries Ltd.
Short Patricia A.
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