Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-01-24
2004-04-27
Buttner, David J. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S311000, C524S313000, C524S317000, C524S318000, C524S323000, C525S174000, C525S439000, C525S444000
Reexamination Certificate
active
06727294
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a thermoplastic resin composition, more particularly, relates to a thermoplastic resin composition comprising a transparent aromatic thermoplastic resin such as polycarbonate resins and a specific copolyester resin.
Thermoplastic resins, especially engineering plastics, are used for a variety of purposes because of their excellent mechanical strength and impact resistance. These resins, however, have their own problems. For example, polyester resins, although excellent in chemical resistance, etc., are not necessarily satisfactory in heat resistance, while polycarbonate resins, though possessed of high transparency and heat resistance, are poor in chemical resistance, and thus for such reasons, these thermoplastic resins have been limited in their scope of use.
Hitherto, various proposals involving blending of various types of resins have been made for the improvement of chemical resistance of polycarbonate resins. For instance, Japanese Patent Publication (KOKOKU) No. 36-14035 discloses a thermoplastic material produced by melting and mixing polyethylene terephthalate and a polycarbonate, and Japanese Patent Application Laid-Open (KOKAI) No. 48-96646 discloses a polycarbonate composition containing polytetramethylene naphthalate and/or polyhexamethylene naphthalate, but these products have the disadvantage of being low in transparency.
A resin composition comprising a polycarbonate and polytetramethylene terephthalate is disclosed in Japanese Patent Application Laid-Open (KOKAI) No. 48-54160, but this composition has the problem that its transparency is impaired, though improved in chemical resistance, when the content of polytetramethylene terephthalate is increased. It is thus difficult with this Laid-Open (KOKAI) to obtain a thermoplastic resin composition which is transparent and also excels in chemical and heat resistance.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a thermoplastic resin composition which is transparent and yet has excellent chemical resistance, heat resistance, etc., and which comprises a transparent thermoplastic resin such as a polycarbonate resin and a specific copolyester resin.
In the first aspect of the present invention, there is provided a thermoplastic resin composition comprising:
a transparent aromatic thermoplastic resin (a) and
a copolyester resin (b) comprising at least two kinds of dicarboxylic acid moieties and one kind of diol moiety, 1 to 50 mol % of the dicarboxylic acid moieties being a naphthalenedicarboxylic acid moiety,
the ratio of (a) to the combined amount of (a) and (b) being 55 to 99.99% by weight, and the ratio of (b) being 0.01 to 45% by weight.
In the second aspect of the present invention, there is provided a thermoplastic resin composition as defined in the first aspect, further comprising at least one additive selected from the group consisting of:
(c) an antioxidant in an amount of 0.001 to 1 part by weight,
(d) a release agent in an amount of 0.001 to 1 part by weight,
(e) a weathering resistance improver in an amount of 0.001 to 10 part by weight and
(f) an ionizing radiation stabilizer in an amount of 0.001 to 20 part by weight, based on the combined amount (100 parts by weight) of the components (a) and (b).
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be explained in detail below. First, explanation is made on the transparent aromatic thermoplastic resins usable as component (a) in the present invention. The “transparent aromatic thermoplastic resins” referred in the present invention designate the thermoplastic resins which have an aromatic ring in the molecule and exhibit a high light transmittance in the visible light range. To put it in a more concrete way, the said transparent aromatic thermoplastic resins are the ones which, when molded into a 3 mm thick product, show a visible light transmittance of not less than 80% as measured according to JIS R 3106. As such transparent aromatic thermoplastic resins, polycarbonate resins, polyarylate resins, polystyrene resins, AS resins and the like are preferably used, but other types of resins such as MS resins, transparent ABS resins, polysulfone resins, polyether sulfone resins, transparent polyamide resins, etc., are also usable. The transparent aliphatic thermoplastic resins such as methacrylic resins are reduced in transparency when a copolyester resin (b) such as mentioned later is blended.
The polycarbonate resins usable as (a) include polymers or copolymers of the thermoplastic aromatic polycarbonates obtained by reacting aromatic dihydroxyl compounds or these compounds plus a small quantity of polyhydroxyl compounds with phosgene or a carbonic acid diester. Such polycarbonates may be branched.
Examples of the aromatic dihydroxyl compounds usable for the above reaction include bis(hydroxyaryl)alkanes such as 2,2-bis(4-hydroxyphenyl)propane (bisphenol A);, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane (tetrabromobisphenol A), bis(4-hydroxyphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)octane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 1,1-bis(3-t-butyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(3-bromo-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, 2,2-bis(3-phenyl-4-hydroxyphenyl)propane, 2,2-bis(3-cyclohexyl-4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, and bis(4-hydroxyphenyl)diphenylmethane; bis(hydroxyaryl)cycloalkanes such as 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane; dihydroxydiaryl ethers such as 4,4′-dihydroxydiphenyl ether and 4,4′-dihydroxy-3,3′-dimethyldiphenyl ether; dihydroxydiaryl sulfides such as 4,4′-dihydroxydiphenyl sulfide and 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfide; dihydroxydiaryl sulfoxides such as 4,4′-dihydroxydiphenyl sulfoxide and 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfoxide; dihydroxydiaryl sulfones such as 4,4′-dihydroxydiphenyl sulfone and 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfone; hydroquinone, resorcin, 4,4′-dihydroxydiphenyl and the like. If necessary these aromatic dihydroxyl compounds may be used as a mixture of two or more of them. Of these compounds, 2,2-bis(4-hydroxyphenyl)propane is especially preferred.
For obtaining the branched aromatic polycarbonate resins, polyhydroxyl compounds such as phloroglucin, 2,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)-3-heptene, 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)-2-heptene, 1,3,5-tris(2-hydroxyphenyl)benzole, 1,1,1-tris(4-hydroxyphenyl)ethane, 2,6-bis(2-hydroxy-5-methylbenzyl-4-methylphenol, and &agr;,&agr;′,&agr;″-tris(4-hydroxyphenyl)-1,3,5-triisopropylbenzene; 3,3-bis(4-hydroxyaryl)oxyindole (isatinbisphenol), 5-chloroisatinbisphenol, 5,7-dichloroisatinbisphenol, 5-bromoisatinbisphenol and the like, may be used.
In the case of phosgene process polycarbonates, a terminator or a molecular weight modifier may be used. As such a terminator or molecular weight modifier, there can be used the compounds having monovalent phenolic hydroxyl groups, which include, beside ordinary phenols such as p-t-butylphenol and tribromophenol, long-chain alkylphenols, aliphatic carboxylic acid chloride, aliphatic carboxylic acids, aromatic carboxylic acids, hydroxybenzoic acid alkyl esters, alkyl ether phenols and the like. In the case of the polycarbonate resins used in the present invention, these terminators or molecular weight modifiers may be used if necessary as a mixture of two or more of them.
The polyarylates in the present invention may be the whole aromatic polyester resins comprising aromatic dicarboxylic acids and divalent phenols. Examples of the said aromatic dicarboxylic acids include terephthalic acid, isophthalic acid and the mixture thereof. A typical example of the said divalent phenols is bisphenol A. A whole aromatic polyester comprising terephthalic acid/isoph
Hatakeyama Tatsuhiko
Honma Ken
Kanayama Satoshi
Miya Shinya
Narita Kenichi
Buttner David J.
Conlin David G.
Edwards & Angell LLP
Hazzard Lisa Swiszcz
Mitsubishi Engineering-Plastics Corporation
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