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. 22, 2014
Filed:
Jul. 05, 2011
Applicant:
Kimiaki Kashiwagi, Tokyo, JP;
Inventor:
Kimiaki Kashiwagi, Tokyo, JP;
Assignee:
Asahi Glass Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08L 27/12 (2006.01); H01G 7/02 (2006.01); H04R 19/01 (2006.01);
U.S. Cl.
CPC ...
H01G 7/023 (2013.01); H04R 19/01 (2013.01);
Abstract
The present invention provides a process for producing an electret which has high thermal stability of retained electric charge and which has excellent charge retention performance. This is accomplished by a process for producing an electret which includes a step of thermally treating a fluorinated polymer and a silane coupling agent, where the fluorinated polymer has an alicyclic structure in its main chain and has a carboxy group or an alkoxycarbonyl group as its terminal group; the silane coupling agent has an amino group; and the weight average molecular weight of the fluorinated polymer is at least 200,000.