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:
Oct. 04, 2016
Filed:
Jun. 29, 2011
Limin Sun, Copley, OH (US);
Frank W. Harris, Boca Raton, FL (US);
Jiaokai Jing, Uniontown, OH (US);
Haci B. Erdem, Akron, OH (US);
John D. Harvey, Seville, OH (US);
Dong Zhang, Uniontown, OH (US);
Limin Sun, Copley, OH (US);
Frank W. Harris, Boca Raton, FL (US);
Jiaokai Jing, Uniontown, OH (US);
Haci B. Erdem, Akron, OH (US);
John D. Harvey, Seville, OH (US);
Dong Zhang, Uniontown, OH (US);
Akron Polymer Systems, Inc., Akron, OH (US);
Abstract
The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.