Method for the apparatus of conductive curable polyester moulding compounds
AssigneeDsm N.V.
InventorsDieter Buhl, Heinz Fuerst, Harald Schneider, Jan Visser, Joachim Zwecker
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Abstract
The invention relates to a process for preparing a conductive curable moulding compound with reduced electrical surface resistance, comprising mixing together an unsaturated polyester resin, a thermoplastic polymer, a conductive paste and optionally a filler, and is characterized in that the conductive paste is obtained by dispersing conductive pigment particles in a solution of a thermoplastic polymer in a suitable solvent. The invention further relates to the conductive paste itself and to mouldings having reduced surface resistance, obtained therefrom.
Claims4
A process for preparing a conductive curable moulding compound with reduced electrical surface resistance, comprising mixing together
- A. an unsaturated polyester resin, and
- B. a thermoplastic polymer, in a weight ratio A:B of 0.4 to 10, the total of A and B being 100 parts by weight (pbw)
- C. 10-60 pbw of a conductive paste,
- D. 0-450 pbw of a filler,
- E. 0.2-4 pbw of a radical initiator, as well as
- F. optionally further customary additives, characterised in that, the conductive paste C is obtained by preparing a solution of a thermoplastic polymer G in a suitable solvent H, and dispersing conductive pigment particles in said solution.
Conductive paste, obtainable by dispersing 3-25 pbw of conductive pigment particles in 97-75 pbw of a solution of 10-60 wt-% of a thermoplastic polymer G in 90-40 wt.-% of a suitable solvent H, the wt.-% being based on the total weight of G and H, optionally adding 0.5-5 pbw of a wetting agent, 1-10 pbw of a viscosity depressant and small amounts of other usual additives.
Article obtained by moulding a curable unsaturated polyester compound, comprising
- 10 to 20 wt. % of cured polyester resin;
- 2 to 20 wt. % of a saturated polyester, optionally replaced up to 50 wt. % of its weight by another thermoplastic polymer;
- 0.5 to 3 wt. % of conductive pigment particles;
- 5 to 65 wt. % of fillers;
- 0.1 to 2 wt % of a thickening agent;
- 10 to 65 wt. % of glass fibres;
- and having an average electrical surface resistance (determined according to DIN 53482) of 10.sup.3 -10.sup.9 Ohm.
Dependencies are inferred from the claim text.