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:
Sep. 27, 2005
Filed:
Nov. 30, 2001
Mitsuaki Kobayashi, Tokyo, JP;
Hiroshi Ayukawa, Sagamihara, JP;
Mitsuaki Kobayashi, Tokyo, JP;
Hiroshi Ayukawa, Sagamihara, JP;
3M Innovative Properties Company, Saint Paul, MN (US);
Abstract
To provide a coating composition of a soluble aromatic polyimide having good heat resistance and mechanical strength. As a soluble polyimide, a compound of the formula (I) in which R's represent independently from one another H, halogen, an alkyl group or an alkoxy group, or a substituted or unsubstituted phenyl group; A is a tetravalent aromatic group or a group of the formula (II) in which B is a covalent bond, a >C(R)group, a carbonyl group, O, S, a >SO, group, a >Si(CH)group, a >Si(CH)group, a >NRgroup or a bifunctional ether group in which Ris a hydrogen atom or —C(R), Ris H, an alkyl group or an aryl group, and Ris H, F or Cl; Ar is an aromatic nucleus or a group of the formula (III) in which Ar and B are the same as defined above, and each p is an integer of 0 to 10; m is an integer of 1 to 10 is used. The polyimide has a weight average molecular weight of 150,000 to 1,000,000.