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:
Jul. 05, 2005
Filed:
Jul. 18, 2002
Yuji Yoshida, Edogawa-ku, JP;
Mikio Takigawa, Tsukuba, JP;
Naoya Satoh, Tsukuba, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
A heat-resistant polyether having a heat resistance to a temperature of 300° C. or higher, sufficient solubility in organic solvents, low water absorption and high adhesion to substrates is provided by a heat-resistant polyether including a repeating unit represented by the formula (1) and having a polystyrene-converted weight-average molecular weight determined by GPC of not less than 1000 and not more than 50000:wherein Ar represents a bivalent organic group having an aromatic ring; Rto Reach independently represent a hydrogen atom or an aryl group which may be substituted; and when at least one of Rto Ris an aryl group which may be substituted, X represents a direct bond or a hydrocarbon group having 1 to 20 carbon atoms, while when all of Rto Rare hydrogen atoms, X is represented by the formula (2):—CR(R)—  (2)wherein Rand Reach independently represent an aryl group which may be substituted.