Polymer mixture comprising polyester, glass fibres, flame-retardant and filler; articles formed therefrom
First Claim
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1. A polymer mixture which comprises A. a polyester having units derived from an alkanediol and an aromatic dicarboxylic acid, B. glass fibres, C. a brominated polystyrene compound as a flameretardant, and D. talcum, characterised in that the polymer mixture comprises milled glass fibres as constituent B.
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Abstract
The invention relates to polymer mixtures which comprise a polyester, glass fibres, a brominated polystyrene and talcum. By using milled glass fibres a polymer mixture is obtained having a high tracking index, good flame-retarding properties and a great rigidity. The invention also relates to articles formed from such polymer mixtures and to a method of preparing the polymer mixtures according to the invention.
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19 Claims
- 1. A polymer mixture which comprises A. a polyester having units derived from an alkanediol and an aromatic dicarboxylic acid, B. glass fibres, C. a brominated polystyrene compound as a flameretardant, and D. talcum, characterised in that the polymer mixture comprises milled glass fibres as constituent B.
- 6. A method of preparing a polymer mixture which comprises A. a polyester having units derived from an alkanediol and an aromatic dicarboxylic acid, B. glass fibres, C. a brominated polystyrene and D. talcum, in which the said constituents are compounded in an extruder, characterised in that constituent D. is used in the form of a master batch.
- 10. A method of improving the comparative tracking index of a mixture of polyester having units derived from an alkanediol and an aromatic dicarboxylic acid and talcum comprising adding, in combination, an effective amount of brominated polystyrene and milled glass fibers to raise the comparative tracking index of the mixture.
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