Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ichishi Aizu0
Masahiro Fujiwara0
Nobuyuki Nakajima0
Noriaki Saito0
Koji Yano0
Date of Patent
March 18, 2008
Patent Application Number
11037058
Date Filed
January 19, 2005
Patent Primary Examiner
Patent 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.
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