Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1996-08-22
2002-02-05
Reddick, Judy M. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S013000, C524S284000, C524S310000, C524S311000, C524S312000, C524S313000, C524S317000, C524S318000, C524S373000, C524S376000, C524S423000, C524S425000, C524S431000, C524S436000, C524S437000, C524S445000, C524S447000, C524S451000, C524S494000, C524S496000, C524S497000, C524S514000, C524S533000
Reexamination Certificate
active
06344509
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a filler-containing thermoplastic resin, more specifically to a thermoplastic resin composition having good flowability and improved impact strength, bending strength and other mechanical properties, toughness and heat stability.
BACKGROUND ART
Traditionally, thermoplastic resins, represented by polyolefin resin, ABS resin and vinyl chloride resin, have been widely used in large amounts because of their excellency in terms of mechanical, electrical and other properties. It is common practice to add inorganic fillers to thermoplastic resins to improve their various properties, including rigidity, impact resistance, weather resistance, dimensional stability, flame retardance, painting property, adhesiveness and color-imparting property. It should be noted, however, that such practice poses problems, including difficult molding owing to reduced thermoplastic resin flowability, deteriorated product appearance owing to poor surface condition, and brittleness owing to reduced toughness. Large amounts of inorganic fillers are often used to improve rigidity, which causes another problem of decreased impact and weather resistance.
As solutions to these problems, there have been proposed some methods involving addition of particular compounds. Such methods include the addition of an ethylene oxide surfactant having a particular HLB value (index of balance between hydrophilic and lipophilic groups, expressed as the value calculated by setting 0% quantity of hydrophilic groups, such as hydroxyl groups, in a molecule as 0 and 100% quantity of hydrophilic groups in a molecule as 20.) (Japanese Patent Laid-Open No. 58-79043), the improvement of moldability and mold release property by the addition of a glycerol ester of higher fatty acid to polycarbonate resin (Japanese Patent Laid-Open No. 49-55752), the improvement of workability by the addition of a glycerol ester of fatty acid to polyolefin resin containing an inorganic powder (Japanese Patent Laid-Open Nos. 64-90234 and 01-90234), and the improvement of moldability and mold release property by the addition of a glycerol triester of fatty acid to polystyrene resin (Japanese Patent Laid-Open No. 04-91150). However, none of these methods provide satisfactory products.
Another method has been proposed in which an ester consisting of polyglycerol and fatty acid is used as a polymer quality-improving agent (Japanese Patent Laid-Open No. 04-202429). However, although the ester has a polymer surface-improving effect, it has no effect on improving strength and moldability as described herein, and also it fails to provide satisfactory products because of poor flowability and heat resistance.
Also, there is a known method in which a dispersing agent derived from hydroxycarboxylic acid is used in producing a dispersion composition of a finely divided ceramic solid and a thermoplastic resin (Japanese Patent Laid-Open No. 62-235252). However, the method does not provide satisfactory products in terms of mechanical properties and heat stability, because the degree of condensation of the hydroxyfatty acid-derived dispersing agent used in the method is as low as 1 to 3, although it enables the obtainment of a dispersion composition.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a thermoplastic resin composition which contains an inorganic filler and/or organic filler, and which has good flowability and toughness, and improved impact strength, bending strength and other mechanical properties, and heat stability.
The present inventors found that a thermoplastic resin composition containing (A) a thermoplastic resin, (B) an inorganic filler and/or organic filler, and (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid and/or (C′) a condensed hydroxyfatty acid having a degree of condensation exceeding 3 presents good solutions to the above problems. The present inventors made further investigation based on this finding, and completed the present invention.
Specifically, the present invention is concerned:
1. A thermoplastic resin composition characterized by comprising (A) a thermoplastic resin; (B) an inorganic filler and/or organic filler; and (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid and/or (C′) a condensed hydroxyfatty acid having a degree of condensation exceeding 3;
2. The thermoplastic resin composition described in Item 1 above, wherein a condensed hydroxyfatty acid, which is a constituent of (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid, is a product obtained by a dehydration polymerization of one or more kinds selected from the group consisting of C12 to C20 hydroxyfatty acids;
3. The thermoplastic resin composition described in Item 2 above, wherein the condensed hydroxyfatty acid, which is a constituent of (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid, is a product obtained by a dehydration polymerization of one or more kinds selected from the group consisting of 9-hydroxystearic acid, 10-hydroxystearic acid, 12-hydroxystearic acid, ricinoleic acid, and hydrogenated castor oil;
4. The thermoplastic resin composition described in any one of Items 1 to 3 above, wherein the condensed hydroxyfatty acid, which is a constituent of (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid, has a degree of condensation exceeding 1;
5. The thermoplastic resin composition described in Item 4 above, wherein the condensed hydroxyfatty acid has a degree of condensation of 3.5 to 7;
6. The thermoplastic resin composition described in any one of Items 1 to 5 above, wherein the polyhydroxy alcohol, which is a constituent of (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid, is one or more kinds selected from the group consisting of polyglycerol and pentaerythritol;
7. The thermoplastic resin composition described in Item 6 above, wherein the polyhydroxy alcohol, which is a constituent of (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid, is one or more polyglycerols selected from the group consisting of diglycerol, triglycerol, tetraglycerol, pentaglycerol, hexaglycerol, and decaglycerol;
8. The thermoplastic resin composition described in any one of Items 1 to 7, wherein (C) a polyhydroxy alcohol ester of condensed hydroxyfatty acid is one or more compounds selected from the group consisting of a tetraglycerol ester of condensed ricinoleic acid, a hexaglycerol ester of condensed ricinoleic acid, an octaglycerol ester of condensed ricinoleic acid, a decaglycerol ester of condensed ricinoleic acid, a tetraglycerol ester of condensed 12-hydroxystearic acid, a hexaglycerol ester of condensed 12-hydroxystearic acid, an octaglycerol ester of condensed 12-hydroxystearic acid, and a decaglycerol ester of condensed 12-hydroxystearic acid;
9. The thermoplastic resin composition described in Item 1 above, wherein the degree of condensation of (C′) a condensed hydroxyfatty acid having a degree of condensation exceeding 3 is in the range of from 4 to 7;
10. The thermoplastic resin composition described in Item 1 or 9, wherein a hydroxycarboxylic acid, which is a constituent of (C′) a condensed hydroxyfatty acid having a degree of condensation exceeding 3, is one or more kinds selected from the group consisting of ricinoleic acid, 9-hydroxystearic acid, 10-hydroxystearic acid, 12-hydroxystearic acid, and fatty acids derived from hydrogenated castor oil;
11. The thermoplastic resin composition described in any one of Items 1 to 10 above, wherein (B) an inorganic filler and/or organic filler is one or more substances selected from the group consisting of extenders, reinforcements, ceramics, flame retardants, and magnetic materials;
12. The thermoplastic resin composition described in Item 11 above, wherein (B) an inorganic filler and/or organic filler is one or more substances selected from the group consisting of calcium carbonate, talc, clay, kaolin, aluminum hydroxide, magnesium hydroxide, barium sulfate, iron oxide, titanium oxide, glass beads, glass fibers, carbon fibers,
Birch & Stewart Kolasch & Birch, LLP
Reddick Judy M.
Taiyo Kagaku Co., Ltd.
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