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US 2011/0297891 A1Published application
Positive temperature coefficient materials with reduced negative temperature coefficient effect
AssigneeSabic Innovative Plastics IP B.V.
InventorsFranciscus Petrus Maria Mercx, Sascha Ter Horst
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Abstract
Positive temperature coefficient (PTC) compositions having a reduced negative temperature coefficient effect (NTC) are provided that are achieved without crosslinking the thermoplastic base material. The PTC compositions include a thermoplastic base resin, an electrically conductive filler and particles of a polymeric additive dispersed in the PTC composition.
Claims10
A positive temperature coefficient composition comprising:
- a) from 20 to 90% by weight of a thermoplastic polymer;
- b) from 10 to 60% by weight of at least one conductive filler;
- and
- c) from 0.1 to 20% by weight of a polymer additive;
- wherein the polymer additive has a melting or softening temperature greater than the melting temperature of the thermoplastic polymer;
- wherein the polymer additive is dispersed in the positive temperature coefficient composition.
3 more elements
A method of making a positive temperature coefficient composition comprising the steps of:
- a) mixing from 10 to 60% by weight of at least one conductive filler with from 20 to 90% by weight of a thermoplastic polymer;
- and
- b) dispersing from 0.1 to 20% by weight of a polymer additive into the positive temperature coefficient composition;
- wherein the polymer additive has a softening or melting temperature greater than the melting temperature of the thermoplastic polymer;
- wherein the polymer additive is dispersed in the positive temperature coefficient composition.
2 more elements
Dependencies are inferred from the claim text.