Method for the preparation of conductive polyphenylene ether-polyamide compositions
AssigneeGeneral Electric Company
InventorsNorberto Silvi, William R. Haaf, Mark Giammattei, Robert Hossan, Thomas J. Stanley, William D. Richards
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Abstract
Conductive polyphenylene ether-polyamide compositions having excellent ductility are prepared by melt blending polyphenylene ether, an unsaturated impact modifying polymer and a functionalizing compound in an initial step, optionally in combination with a portion of the polyamide, and subsequently melt blending with the remainder of the polyamide and conductive carbon black having a low volatiles content. A mixture of polyamides, illustrated by mixtures of polyamide-6 and polyamide-66, is employed.
Claims12
A method for preparing a conductive resinous composition which comprises:
- I. melt blending, to form a first resin blend:
- (A) a polyphenylene ether resin;
- (B) at least one impact modifying polymer comprising at least 40% by weight of ethylenically unsaturated structural units;
- and
- (C) an effective proportion of a non-polymeric functionalizing compound capable of reacting in the melt with polyphenylene ethers and polyamides;
- and
- II. melt blending said first resin blend with
- (D) a polyamide composition comprising (i) at least 20% by weight of at least one polyamide consisting essentially of structural units of the formula
- --NH--R.sup.1 --CO-- (I)
- with any balance being (ii) at least one polyamide consisting essentially of structural units of the formula
- --NH--R.sup.2 --NH--CO--R.sup.3 --CO--, (II)
- wherein each of R.sup.1-3 is an alkylene radical, said polyamide introduced in this step being in powder form;
- and
- (E) an effective proportion of conductive carbon black having a volatiles content less than 1.0% by weight;
- to form a final resin blend comprising polyamide as a continuous phase and polyphenylene ether, impact modifying polymer and carbon black as one or more dispersed phases, said final resin blend having a bulk electrical resistivity of at most 200 KOhm-cm and, in the falling dart impact test, a total energy at 23.degree. C. of at least 48 joules and a failure mode other than fully brittle;
- the weight ratio of reagent D to the combination of reagents A, B and C in said final resin blend being at least about 0.75.
Dependencies are inferred from the claim text.