US Patent 7345132 Method of producing novolak resin
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Patent Inventor Names
Ichishi Aizu0
Koji Yano0
Masahiro Fujiwara0
Nobuyuki Nakajima0
Noriaki Saito0
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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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US Patent 07345132 Method of producing novolak resin US Patent 7345132 Method of producing novolak resin
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Patent Number
07345132
Patent Number
7345132
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Official Website
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US Patent 07345132 Method of producing novolak resin
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Is a
Patent jurisdiction
Patent number
07345132
Date of patent
March 18, 2008
Patent application number
11037058
Date Filed
January 19, 2005
Patent primary examiner
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