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:
Jan. 23, 2007
Filed:
Sep. 14, 2001
Masato Naito, Kanuma, JP;
Hiroyuki Gokuraku, Imaichi, JP;
Daisuke Imanari, Tochigi-ken, JP;
Noritoshi Nishiyama, Utsunomiya, JP;
Masato Naito, Kanuma, JP;
Hiroyuki Gokuraku, Imaichi, JP;
Daisuke Imanari, Tochigi-ken, JP;
Noritoshi Nishiyama, Utsunomiya, JP;
JSP Corporation, Tokyo, JP;
Abstract
Description is made of an open cell polystyrene resin foam having a content of organic volatile matters of less than 100 ppm. The open cell foam is suitable as a core material for a sound insulating material or a vacuum heat insulating material. The open cell foam can be produced by melt-kneading a polystyrene resin having a content of organic volatile matters of 100 ppm or higher together with water in an extruder, sucking out the organic volatile matters as an azeotrope with water through a vent, injecting a blowing agent and kneading the injected mixture, and extruding the mixture into a lower pressure area to cause the resin to foam.