Title:
MODIFIED PHENOLIC RESIN
Document Type and Number:
Japanese Patent JPH0352915
Kind Code:
A
Abstract:
PURPOSE:To obtain a modified phenolic resin having a specific softening point by mixing phenol with a specific aromatic hydrocarbon formaldehyde resin at a specific ratio, reacting the components in the presence of an acid catalyst, adding specific amounts of formaldehyde and an alkaline catalyst and reacting under refluxing. CONSTITUTION:The objective modified phenolic resin has a softening point of 65-85 deg.C and excellent heat resistance, moisture-resistance and electrical properties and is suitable as a binder for reinforced material. It can be produced by mixing 100 pts.wt. of phenol with 10-70 pts.wt. of an aromatic hydrocarbon formaldehyde resin containing <=5wt.% of diarylmethane component and having a xylenol value of >=14mol/kg, reacting the components with each other in the presence of an acid catalyst (preferably p-toluenesulfonic acid), adding 25-55 pts.wt. of formaldehyde and an alkaline catalyst (preferably sodium hydroxide, etc.), reacting under refluxing and distilling off the unreacted components under reduced pressure.
Inventors:
YAMAGISHI KAZUYOSHI
ONUMA YASUSHI
ONUMA YASUSHI
Application Number:
JP18664789A
Publication Date:
March 07, 1991
Filing Date:
July 19, 1989
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO
International Classes:
C08G14/12; C08G14/00; C09J161/00; C09J161/34; (IPC1-7): C08G14/12; C09J161/34
Next Patent: MIXED POLYIMIDE AND ITS PREPARATION