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. 07, 2006
Filed:
Jun. 14, 2002
Masato Naito, Kanuma, JP;
Naochika Kogure, Utsunomiya, JP;
Daisuke Imanari, Tochigi-ken, JP;
Noritoshi Nishiyama, Utsunomiya, JP;
Masato Naito, Kanuma, JP;
Naochika Kogure, Utsunomiya, JP;
Daisuke Imanari, Tochigi-ken, JP;
Noritoshi Nishiyama, Utsunomiya, JP;
JSP Corporation, Tokyo, JP;
Abstract
A method for production of an extruded, polystyrene-based foam plate wherein a polystyrene-based resin is heated and kneaded together with a blowing agent, a flame retardant and a nucleating agent in an extruder to obtain a foamable molten composition, and the foamable molten composition is extruded through a die attached to an end of the extruder into a lower pressure zone. The blowing agent comprises not smaller than 25% by weight but not greater than 65% by weight, based on the total weight of the blowing agent, of an isobutane-containing saturated hydrocarbon; not smaller than 5% by weight but not greater than 70% by weight, based on the total weight of the blowing agent, of a dimethyl ether-containing ether; not smaller than 5% by weight but not greater than 55% by weight, based on the total weight of the blowing agent, of carbon dioxide; and 0–25% by weight, based on the total weight of the blowing agent, of other blowing agent components.