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. 18, 2008
Filed:
Jan. 19, 2005
Noriaki Saito, Toyonaka, JP;
Ichishi Aizu, Niihama, JP;
Nobuyuki Nakajima, Niihama, JP;
Masahiro Fujiwara, Niihama, JP;
Koji Yano, Niihama, JP;
Noriaki Saito, Toyonaka, JP;
Ichishi Aizu, Niihama, JP;
Nobuyuki Nakajima, Niihama, JP;
Masahiro Fujiwara, Niihama, JP;
Koji Yano, Niihama, JP;
Chang Chun Plastics Co. Ltd, Hsinchu Industrial District, TW;
Abstract
Provided an industrially excellent method of producing a phenol novolak resin having an ortho ratio of 30% or more by: (1) a method of reacting a phenol and an aldehyde using an oxalic acid catalyst at 110 to 160° C. under pressure; or (2) a method of reacting a phenol and an aldehyde under pressure while removing the heat of reaction by a condenser with controlling a pressure so that water or an organic solvent present in the reaction system is refluxed.