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:
Nov. 16, 2010
Filed:
May. 01, 2009
Shinya Higuchi, Chiyoda-ku, JP;
Jun Hoshikawa, Chiyoda-ku, JP;
Hiroki Kamiya, Chiyoda-ku, JP;
Yasuhiko Matsuoka, Chiyoda-ku, JP;
Hiroki Nagai, Chiyoda-ku, JP;
Shinya Higuchi, Chiyoda-ku, JP;
Jun Hoshikawa, Chiyoda-ku, JP;
Hiroki Kamiya, Chiyoda-ku, JP;
Yasuhiko Matsuoka, Chiyoda-ku, JP;
Hiroki Nagai, Chiyoda-ku, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
Provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier by using a weakly basic anion-exchange resin to adsorb and remove a fluorinated emulsifier with excellent efficiency from an aqueous fluorinated polymer dispersion. Also provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier, wherein the process includes: adding an organic carboxylic acid represented by the following formula (1):Q(CH)(CH(OH))COOH  (1)wherein Q is H, CHor COOH, m and n each independently represent 0 or an integer of from 1 to 4, and 4≧n+m≧1, to an aqueous fluorinated polymer dispersion containing a fluorinated emulsifier; and then contacting with a weakly basic anion-exchange resin to adsorb and remove the fluorinated emulsifier.