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...
Patent
1996-06-25
1997-12-23
Hoke, Veronica P.
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...
524308, 524376, 524377, 524378, C08K 510, C08K 506, C08K 505
Patent
active
057008574
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns a type of flame resistant polyester resin composition characterized by the fact that it has a high productivity and can be used preferably in manufacturing terminal blocks, coil bobbins, and other precision parts in the electrical/electronic field for which the surface appearance is important.
In the conventional scheme, as a type of polyethylene terephthalate resin composition with improved productivity arising from an increased crystallization rate while the mechanical characteristics are maintained, a polyethylene terephthalate resin composition is prepared by adding a polyalkylene oxide soft segment as well as a certain type of plasticizer using this type of polyethylene terephthalate resin composition in a molding machine that has its temperature water-regulated at a mold temperature of 90.degree. C. or less, the molding formed has a fully crystallized surface, as indicated by good surface gloss.
However, when this type of polyethylene terephthalate resin composition is used to form moldings used as precision parts in the electrical/electronic field for which the surface appearance is important, flame resistance is a problem. Also, the impact strength and heat shock property can be improved.
The purpose of this invention is to provide a type of flame resistant polyester resin composition that can be used preferably in manufacturing precision parts in the electrical/electronic field for which surface appearance is important and for which there is a high demand on the impact strength and heat shock property. The crystallization rate of the composition is high and low-temperature molding can be performed using it; it also has excellent mechanical characteristics. As a result, thin-film strength and the resin flow characteristics of the thin-film portion are improved and pin retaining strength can be increased.
In order to realize the aforementioned purpose, this invention provides a type of flame resistant polyester resin composition characterized by the fact that this type of flame resistant polyester resin composition is made principally of the following components: A. 20-80 wt % of a polyester matrix resin prepared for 1-100 parts by weight by adding 1-10 parts by weight of a polyalkylene oxide soft segment component to 99-90 parts by weight of a polyester resin, with the polyester resin selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate/polybutylene terephthalate mixture, polyethylene terephthalate/polybutylene terephthalate copolymer, and mixtures thereof (the mixtures and copolymers preferably contain at least 70 wt % ethylene terephthalate units), and with the polyalkylene oxide soft segment component having a molecular weight of 200-3250; B. 5-25 wt % of a brominated flame resistant agent; C. 1-10 wt % of a plasticizer represented by the formula: ##STR1## m=1-3 n=4-25 crystallization promoter derived from the group consisting of consisting of hydrocarbon acids containing 7-54 carbon atoms and organic polymers having at least one carboxyl group attached thereto, groups of (a) selected from the group consisting of sodium and potassium ion sources, where the concentration of said metal in said matrix resin (A) is at least 0.01 weight percent,
The resin composition of this invention contains polyester matrix resin A, which is prepared by adding 1-10 parts by weight of a polyalkylene oxide soft segment component having a molecular weight of 200-3250 to 100 parts by weight of a polyester resin.
The polyester resin of this invention is selected from the group of polyethylene terephthalate, polyethylene terephthalate/polybutylene terephthalate mixture, polyethylene terephthalate/polybutylene terephthalate copolymer, and their mixtures (the mixtures and copolymers, should contain at least 70 wt % ethylene terephthalate units). Among them, polyethylene terephthalate having an intrinsic viscosity of at least about 0.4 at 30.degree. C. in a 3:1 (by volume) mixture of methylene chloride and trifluoroacetic acid is p
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E. I. Du Pont de Nemours and Company
Hoke Veronica P.
Krukiel Charles E.
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