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:
May. 15, 1990
Filed:
Aug. 19, 1987
Applicant:
Inventor:
Masao Nambu, Kanagawa, JP;
Assignee:
Nippon Oil Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264 28 ; 264101 ; 264102 ;
Abstract
A process for the preparation of a gel for use as a cooling medium is provided which comprises the steps of casting an aqueous solution or suspension containing a polyvinyl alcohol having a degree of hydrolysis of not less than 95 mol % and a viscosity average polymerization degree of not less than 1500 into a mold having desired shape and dimensions, cooling the cast aqueous solution to a temperature of not higher than - (minus) 6.degree. C., and then dehydrating without thawing the cooled mass of the cast aqueous solution in vacuum until the percentage dehydration rate reaches not less than 5 wt %.