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:
Mar. 04, 2014
Filed:
May. 13, 2005
Norihiro Sugihara, Hyogo, JP;
Yuhei Funabiki, Hyogo, JP;
Norihiro Sugihara, Hyogo, JP;
Yuhei Funabiki, Hyogo, JP;
Sumitomo Seika Chemicals Co., Ltd., Hyogo, JP;
Abstract
The present invention provides a method of producing, in an industrially advantageous manner, an ethylene/vinyl alcohol copolymer aqueous dispersion which has a high concentration and is excellent in long-term storage stability and in which the resin particles in the aqueous dispersion obtained are small in particle diameter. The method of the present invention relates to producing an ethylene/vinyl alcohol copolymer aqueous dispersion, which comprises: (1) a step of dissolving an ethylene/vinyl alcohol copolymer in a mixed solvent comprising 5 to 65% by weight of water and 35 to 95% by weight of a water-soluble organic solvent, with heating, (2) a step of cooling a solution obtained in step (1) to precipitate the ethylene/vinyl alcohol copolymer, (3) a step of reducing a concentration of the water-soluble organic solvent in the mixed solvent to a level lower than 35% by weight relative to the total amount of the water and water-soluble organic solvent by adding water, and (4) a step of distilling off the water-soluble organic solvent.