Method for adjusting the switching temperature of PTC ink composition and PTC ink composition
First Claim
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1. A positive temperature coefficient (PTC) ink composition comprising, by weight, based on total composition:
- a) 10-50 wt. % polymer resin;
b) 10-50 wt. % carbon black;
c) 30-70 wt. % organic solvent, where the polymer resin and carbon black are dispersed in the organic solvent;
d) at least 0.5-10 wt. % of Ts adjust agents and other optional additives.
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Abstract
The invention provides a method for producing a PTC ink composition, which is capable of adjusting the switching temperature (Ts) of the PTC ink composition by addition of some additives. The content of the additive based on the total PTC composition for adjusting the Ts is less than 5.0 wt. %. The additives for adjusting the Ts can be chosen from polyester, polyether, and poly(ethylene glycol) with low molecular weight from 300 to 3000 g/mol.
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7 Claims
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1. A positive temperature coefficient (PTC) ink composition comprising, by weight, based on total composition:
- a) 10-50 wt. % polymer resin;
b) 10-50 wt. % carbon black;
c) 30-70 wt. % organic solvent, where the polymer resin and carbon black are dispersed in the organic solvent;
d) at least 0.5-10 wt. % of Ts adjust agents and other optional additives. - View Dependent Claims (2, 3, 4, 5, 6)
- a) 10-50 wt. % polymer resin;
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7. A sheet of claim 7 is used in self-regulated heating device.
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