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US 7,604,754 B2Granted
Resistor compositions for electronic circuitry applications
AssigneeE. I. Du Pont de Nemours and Company
InventorJohn D. Summers
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Abstract
Resistor compositions are disclosed, made from polymer thick film resistor formulations comprising a polyimide component, a sterically hindered hydrophobic epoxy component and a solvent component having a Hanson polar solubility parameter between 2.1 and 3.0 and having a normal boiling point between 210 and 260° C. The weight ratio of polyimide component (“A”) to epoxy component (“B”) is A:B, where A is between and including 1 to 15 and where B is 1.
Claims3
A polymeric thick film (“PTF”) resistor paste comprising:
- i. a polyimide component having a glass transition temperature greater than 250° C.,
- ii. a sterically hindered hydrophobic epoxy component;
- and
- iii. an organic solvent having a Hanson polar solubility parameter between 2.1 and 3.0 and having a normal boiling point between 210 and 260° C.,
- wherein the weight ratio of polyimide component (“A”) to epoxy component (“B”) is A:B, where A is between and including 1 to 15 and where B is 1, wherein the polyimide component and epoxy component are crosslinked together by means of a sterically hindered phenol crosslinking agent, and wherein the amount of sterically hindered phenol added to the polyimide component and the epoxy component is between 0.6 and 3.0 mole percent of the amount of sterically hindered epoxy component.
2 more elements
Dependencies are inferred from the claim text.