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
2000-05-08
2003-06-10
Egwim, Kelechi (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...
C524S284000, C524S310000, C524S313000, C524S317000, C524S318000, C524S376000, C524S377000
Reexamination Certificate
active
06576695
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel thermoplastic resin composition. More specifically, the present invention relates to a thermoplastic resin composition which can markedly improve a thermal aging (or ageing) resistance of a thermoplastic resin when it is molded, a resin molded article obtained by molding the same, and a terminal product (resin molded product) containing this molded article.
2. Description of the Related Art
A resin molded article which is obtained by using a thermoplastic resin, and, for example, kneading and molding the same, has been used in many fields, for example, automobile parts such as a bumper product and an instrumental panel, electric parts such as a computer housing, and building products such as an insulation material.
When producing these resin molded articles and molded products thereof, kneading was hitherto conducted with heating. However, this procedure was problematic in a thermal aging (or ageing) resistance in view of occurrence of coloration, a decrease in a resin strength and the like. Accordingly, in order to prevent this, an antioxidant was added (refer to Antioxidant Handbook, Taiseisha, 1st edition, published Oct. 25, 1976).
In this case, phenolic, phosphorus-type, amine-type and sulfur-type antioxidants are added to prevent the coloration and the decrease in the resin strength. However, the dispersibility of the antioxidant is poor. Further, even when it is added in a large amount, an ability to prevent the coloration cannot be exhibited satisfactorily. Addition of the antioxidant in a large amount decreases the resin strength, and is economically disadvantageous.
There is another method using an additive which is ordinarily employed as a lubricant, such as a fatty acid, a fatty acid metal soap, for example, a fatty acid calcium salt, or a fatty acid amide. Nevertheless, this method cannot provide a sufficient dispersion effect, and the lubricant is liable to bleed out from a resin molded article. It is known that a condensate of polyglycerin and a hydroxycarboxylic acid polycondensate (polyester) is used to improve a thermal aging resistance (refer to Japanese Patent Kokai Publication No. JP-A-8-302,065). However, a satisfactory thermal aging resistance is not necessarily provided. Further, it is reported that a composition obtained by mixing a thermoplastic resin with a polyglycerin fatty acid ester along with an inorganic filler can improve an impact strength and a weatherability (refer to Japanese Patent Kokai Publication No. JP-A-4-202,429). However, no satisfactory improvement of the thermal aging resistance is provided either.
Still further, there are reported a thermally stable polyolefin composition comprising a polyolefin, an inorganic filler, a hindered phenolic antioxidant, a sulfur-type antioxidant and a fatty acid (lauric acid, palmitic acid, stearic acid or the like) ester of a neopentyl-type polyhydric alcohol (refer to Japanese Patent Kokoku Publication No. JP-B-61-46,015), a method in which a porous sheet is produced by stretching a sheet obtained by melt-molding a composition comprising a polyolefin resin, a filler and a dipentaerythritol ester (refer to Japanese Patent Kokoku Publication No. JP-B-7-5, 781), an inorganic filler for a synthetic resin which is formed by coating a fatty acid ester of a polyhydric alcohol with an inorganic compound powder (refer to Japanese Patent Kokai Publication No. JP-A-52-49,254), a plastic composition obtained by incorporating a carrier and a fatty acid polyol-type ester in a synthetic resin (refer to Japanese Patent Kokai Publication No. JP-A-52-144,048), a polyolefin resin composition containing a polyolefin resin, an inorganic powder and an ester formed by the reaction of a trihydric or tetrahydric fatty alcohol, a fatty acid and a fatty dibasic acid in approximately equivalent amounts (refer to Japanese Patent Kokai Publication No. JP-A-64-90,234). However, the thermal aging resistance is not necessarily improved satisfactorily.
1. Problems to be Solved by the Invention
In the course of the completion to the present invention, the following problems have been also found by the present invention.
As is understandable from the prior art which has been explained above including the points at issue and the problem, the problem is to provide an additive or a thermoplastic resin composition which can improve a thermal aging resistance when a thermoplastic resin is molded.
It is an object of the present invention to provide, upon solving the above-mentioned problem, a thermoplastic resin composition which can improve a thermal aging resistance of a thermoplastic resin molded article which is formed through molding with a small amount of an additive in particular, further a resin molded article formed by molding the same and a terminal product (molded product) containing the same.
SUMMARY OF THE INVENTION
In order to solve the above-mentioned problems, the present inventors have assiduously conducted investigations, and have consequently found that a thermoplastic resin composition obtained by incorporating a combination of
(i) a polyglycerin derivative in which at least one of hydroxyl groups of a polyglycerin molecule is esterified with a fatty acid and an antioxidant, especially, an antioxidant which is solid at normal temperatures and normal pressures into a thermoplastic resin; and/or
(ii) an N-acyl basic amino acid and a filler into a thermoplastic resin, wherein for the thermoplastic resin at least one type selected from the group consisting of a polyolefin resin, a polystyrene resin, a polyester resin, a polyamide resin and an engineering plastic is contained; and/or
(iii) a dibasic acid erythritol ester and a filler into a thermoplastic resin, the ester having a degree of esterification that does not exceed 50% is used, thereby making it possible to much decrease the amount of the ester, with the result that strength properties and a thermal aging resistance of a resin molded article formed by molding this composition, wherein the thermoplastic resin used therein is a thermoplastic resin containing at least one type selected from the group consisting of a polyolefin resin, a polystyrene resin, a polyester resin, a polyamide resin and an engineering plastic, the amount of the dibasic acid erythritol ester being less than 1 part by weight per 100 parts by weight of the thermoplastic resin;
are extremely excellent, particularly in strength properties and a thermal aging resistance of a resin molded article obtained by molding the same.
In using the polyglycerin derivative, it has been further found that when a filler or antioxidant, especially a solid antioxidant, is added and incorporated as required, the effect is all the more increased synergistically, and it is therefore preferable.
In using the N-acyl basic amino acid, the thermoplastic resin here referred to is a resin containing at least one type selected from the group consisting of a polyolefin resin, a polystyrene resin, a polyester resin, a polyamide resin and an engineering plastic.
In using also the N-acyl basic amino acid, it has been further found that when an antioxidant is added and incorporated as required, the effect is all the more increased, and it is therefore preferable.
In using the dibasic acid erythritol ester, the thermoplastic resin used is a thermoplastic resin containing at least one type selected from the group consisting of a polyolefin resin, a polystyrene resin, a polyester resin, a polyamide resin and an engineering plastic, the amount of the dibasic acid erythritol ester being less than 1 part by weight per 100 parts by weight of the thermoplastic resin.
In using also the dibasic acid erythritol ester, it has been further found that when an antioxidant, especially a solid antioxidant is added and incorporated as required, the effect is all the more increased synergistically.
These above findings have led to the completion of the present invention.
That is, the present invention is the following:
A thermoplastic resin composition c
Otsuka Katsuhiro
Tanaka Hiroyuki
Watanabe Ryohei
Yasuda Naoki
Ajinomoto Co. Inc.
Egwim Kelechi
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