Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-07-05
1994-02-08
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525111, 525117, 525123, 525131, 525166, 525510, 525511, C08L 6300, C08F 800
Patent
active
052849171
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to thermoplastic resin compositions having excellent moldability and thermal resistance.
2. Background Art
It is disclosed in Japanese Patent Laid-Open No. 41355/'84 that mixtures of a methacrylimide-containing polymer and a thermoplastic polyester provide resin compositions having high thermal resistance, as well as excellent mechanical strength and melt flow properties. Moreover, it is disclosed in Japanese Patent Laid-Open Nos. 25836/'84 and 208348/'83 that mixtures of a methacrylimide-containing polymer and a polyamide provide resin compositions having low molding shrinkage and high toughness.
However, resin compositions formed simply by blending a methacrylimide-containing polymer with a thermoplastic polyester or polyamide tend to produce sink marks and flash during melt molding and are hence disadvantageous from the viewpoint of moldability.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a resin composition consisting essentially of a methacrylimide-containing polymer and at least one of a thermoplastic polyester and a thermoplastic polyamide and exhibiting improved moldability.
According to the present invention, there is provided a thermoplastic resin composition comprising at least 10% by weight of methacrylimide units represented by the general formula ##STR2## where R is a hydrogen atom or an aliphatic, aromatic or alicyclic hydrocarbon radical having 1 to 20 carbon atoms, from the group consisting of a thermoplastic polyester (B-1) and a thermoplastic polyamide (B-2), the combined amount of components (A) and (B) being 100 parts by weight, and selected from the group consisting of a multifunctional epoxy compound, a multifunctional oxazoline compound and a multifunctional isocyanate compound.
BEST MODE FOR CARRYING OUT THE INVENTION
The methacrylimide-containing polymer (A) used in the present invention is a polymer or copolymer containing cyclic imide units represented by the above general formula (1). Methacrylimide-containing polymers having any chemical structure can be used, provided that they contain not less than 10% by weight of cyclic imide units as described above. However, methacrylimide-containing polymers in which R is hydrogen, methyl, ethyl, propyl, butyl or phenyl are usually used.
No particular limitation is placed on the method of preparing the methacrylimide-containing polymers. By way of example, one useful process comprises dissolving polymethyl methacrylate and ammonia or a primary amine (such as methylamine or ethylamine) in a suitable solvent (selected, for example, from aromatic hydrocarbons such as benzene, toluene, xylene and ethylbenzene; alcohols such as methanol, ethanol and propanol; and mixtures of two or more these solvents), and heating the reaction mixture in an autoclave at 170.degree.-350.degree. C. to form imide rings. Alternatively, the reaction may be carried out in an extruder as described in Japanese Patent Laid-Open No. 63989/'77.
It is necessary that the cyclic imide units represented by the above general formula (1) be contained in an amount of at least 10% by weight based on total weight of the polymer. If the amount is less than 10% by weight, the methacrylimide-containing polymer will fail to exhibit its inherent thermal resistance.
In the resin compositions of the present invention, the methacrylimide-containing polymer is used in an amount of 1 to 99 parts by weight, preferably 5 to 95 parts by weight, per 100 parts by weight of the mixture of components (A) and (B).
The thermoplastic polyester (B-1) used in the present invention is a polyester formed by the polycondensation of at least one aromatic dicarboxylic acid component selected from the group consisting of terephthalic acid, 2,6-naphthalenedicarboxylic acid and isophthalic acid, with at least one diol component selected from the group consisting of alkylene glycols (such as ethylene glycol, propylene glycol, butylene glycol and hexylene glycol) and polyalkylene glycols (such as polyethylene gly
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Fujimoto Masaharu
Mori Hiroshi
Yamamoto Naoki
Bleutge John C.
Gulakowski Randy
Mitsubishi Rayon Co. Ltd.
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