Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1999-11-24
2001-06-19
Hoke, Veronica P. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S405000, C524S434000
Reexamination Certificate
active
06248814
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a resin composition, and more particularly relates to an aromatic polyester resin composition having an excellent flame retardant property and electric insulation property.
BACKGROUND ART
The engineering plastics are excellent in mechanical characteristics, heat resistance and molding processability, and their utilization are expanding in the fields of automobile parts, machinery parts and electric/electronic parts.
In the electric/electronic field, since a safety in use, a production efficiency and the utilization of recycled resources are required, while a process of making the parts thereof as having a light weight, thin thickness, short length and small size, and also having a high performance is progressing, the engineering plastics, particularly the aromatic polyester as a central figure, which is excellent in heat resistance, molding processability and chemical resistance and relatively easy for making it of flame retardant, are extending their range of uses.
As to the method for making the engineering plastics of flame retardant, a technology for blending a red phosphorus and a zinc compound such as zinc borate, etc., with a polyamide was disclosed in the Japanese unexamined patent publication 6-145504. Although the polyamide itself has an excellent tracking resistance, the changes in electrical and mechanical characteristics caused by the absorption of moisture are large. And it is known that the flame retardant property of the polyamide is increased by an interaction between phosphorus atom and nitrogen atom in the polymer skeleton of the polyamide. Therefore the technologies for aiming at the method for making the polyamide of flame retardant are known besides the above Japanese unexamined patent publication 6-145504.
On the other hand, the aromatic polyester is widely used as the electric/electronic parts. In this case, it is made of flame retardant by blending an organic halogenous compound therewith in most of the cases for increasing the safety for a fire of the product composed of the molded product thereof.
DISCLOSURE OF THE INVENTION
The tracking resistance is one of the measures of the electric insulation, The tracking resistance is good in the aromatic polyester itself, but reduced markedly by blending the organic halogenous compound with the aromatic polyester for making the same of flame retardant. Therefore, although the aromatic polyester composition is made of flame retardant, there is an issue of an increased risk of a fire because of the lack of the tracking resistance.
Since there is no interaction of phosphorus atom in a flame retardant agent with nitrogen atom in the polymer skeleton of the aromatic polyester as in the case of the polyamide, it is more difficult to make the polyester of flame retardant as compared with the case of the polyamide. In order to impart a similar degree of the flame retardant property, it is necessary to add a larger amount of the phosphorus compound, however, the addition of the large amount of the phosphorus compound to the polyester resin brings not only the reduction of the tracking resistance but also the reduction of the mechanical characteristics and the molding processability.
The present invention is accomplished in the above mentioned circumstance as a background.
The objective of the present invention is to provide a polyester resin composition excellent in flame retardant property and electrical insulation property, and especially, the flame retardant polyester resin composition capable of being suitably used in electric/electronic uses, showing less change of the characteristics in absorbing moisture, excellent in flame retardant property, and equipped with a high tracking resistance.
The other objects and advantages of the present invention will be clarified from the following explanations.
The present invention is composed of the following constitutions.
1. A resin composition comprising (A) an aromatic polyester of 100 parts weight, (B) red phosphorus and/or an organic phosphorus compound of 1 to 20 parts weight based on a phosphorus atom content and (C) at least one kind of compound of 2 to 50 parts weight selected from a group consisting of zinc borate, zinc stannate and zinc oxide.
2. A resin composition comprising (A) an aromatic polyester of 100 parts weight, (B) red phosphorus and/or an organic phosphorus compound of 1 to 20 parts weight based on a phosphorus atom content, (C) at least one kind of compound of 2 to 50 parts weight selected from a group consisting of zinc borate, zinc stannate and zinc oxide and (D) an inorganic filler, in which the total of the components (C) and (D) is 25 to 60 weight percent based on the total amount of the composition.
The present invention is explained in detail as follows.
((Aromatic Polyester (A)))
The aromatic polyester (A) used in the present invention, is a polyester using an aromatic dicarboxylic acid as a dicarboxylic acid component and an aliphatic diol as a diol component.
As the dicarboxylic component, terephthalic acid, isophthalic acid, phthalic acid; a phthalic acid derivative such as methyl terephthalate, methyl isophthalate, etc.; and a naphthalene dicarboxylic acid such as 2,6-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid and their derivatives can be cited as examples.
As the diol component, an aliphatic diol such as ethylene glycol, propylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, etc., can be cited as examples.
As the aromatic polyester (A), a polytetramethylene terephtahlate, a polyethylene terephthalate and a polytetramethylene-2,6-naphthalene dicarboxylate are preferable since they are excellent in heat resistance, chemical resistance and molding processability.
The aromatic polyester (A) is allowed to be substituted by for example 40 mol % or less, preferably 30 mol % or less and more preferably 20 mol % or less of a copolymerizable component based on the total carboxylic acid components or the total diol components.
As the copolymerizable component, among the above mentioned dicarboxylic components and diol components, a dicarboxylic acid and a diol component besides those used as the main components, can be used.
As the copolymerizable dicarboxylic acid component, concretely, isophthalic acid, phthalic acid; a phthalic acid derivative such as methyl terephthalate, methyl isophthalate, etc.; and a naphthalene dicarboxylic acid such as 2,7-naphthalene dicarboxylic acid, 1,5-naphthalene dicarboxylic acid and their derivatives; a diphenyl dicarboxylic acid such as 4,4′-diphenyl dicarboxylic acid, 3,4′-diphenyl dicarboxylic acid, etc., and their derivatives; an aromatic dicarboxylic acid such as 4,4′-diphenoxymethane dicarboxylic acid, 4,4′-diphenoxyethane dicarboxylic acid, etc.; an aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid, azelaic acid, decane dicarboxylic acid, etc.; and an alicyclic dicarboxylic acid such as cyclohexane dicarboxylic acid, can be cited as examples, and as the copolymerizable diol components, concretely, an alicyclic diol such as 1,4-cyclohexane dimethanol, etc.; a dihydroxybenzene such as hydroquinone, resorcin, etc. and their derivatives; a bisphenol compound such as 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)sulfone, etc.; and an aromatic diol such as an ether diol obtained from a bisphenol compound with a glycol such as ethylene glycol, can be cited as examples. Besides these, it is possible to copolymerize an oxycarboxylic acid, and as the oxycarboxylic acid, &egr;-oxycaproic acid, hydroxybenzoic acid and hydroxyethoxybenzoic acid can be cited as examples.
In the aromatic polyester (A) a branching component can be copolymerized. As the branching component, for example a 3 functional or 4 functional acid having an ester forming function such as tricarballylic acid, trimesic acid, trimellitic acid, etc.; and a 3 functional or 4 functional alcohol having an ester forming function such as glycerol, trimethylolpropane,
Hironaka Katsuhiko
Suzuki Mioko
Hoke Veronica P.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Teijin Limited
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