The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 2012
Filed:
Aug. 02, 2010
Kuppusamy Kanakarajan, Dublin, OH (US);
Arnold Frances, Glen Allen, VA (US);
Kuppusamy Kanakarajan, Dublin, OH (US);
Arnold Frances, Glen Allen, VA (US);
E.I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The invention is directed to polyimide based adhesives having a coefficient of thermal expansion ('CTE') equal to or below 50 ppm/° C. The adhesives of the present invention contain a polyimide base polymer present in the overall adhesive in an amount from 25 to 95 weight percent. The polyimide base polymer has a glass transition temperature ('T') in a range of from about 150 to about 300° C. and typically has a coefficient of thermal expansion above 50 ppm/° C. The polyimide based adhesives of the invention also contain an aramid micro fiber filler in an amount from 5 to 75 weight percent, based upon the total weight of the polyimide based adhesive. The fiber filler can be used to lower CTE of the overall adhesive to match (or nearly match) the CTE of other materials like metal, silicon wafers, other polymers (including polyimide) and the like.