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US 5,206,333 AGranted
Method of producing a naphthol-modified phenolic resin of highly increased molecular weight
AssigneeHitachi Chemical Company, Ltd.
InventorsHaruaki Sue, Ken Nanaumi, Takuji Itou, Ken Madarame, Shinsuke Hagiwara
Life of this patent
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Abstract
A copolycondensation of a phenol, a naphthol and formaldehyde proceeds smoothly in the presence of an acid and a metallic element selected from the group consisting of transition metallic elements and metallic elements of Group IIa, Group IIIa, Group IVa, Group Va and Group VIa of the Periodic Table, and a naphthol-modified phenolic resin which has a large molecular weight and does not gel is obtained.
Claims17
A method of producing a highly increased molecular weight naphthol-modified phenolic resin by inhibiting gellation time, comprising:
- allowing a phenol (P), a naphthol (N) and formaldehyde (F) to react in quantities which provide a mol % of the phenol ranging from 95 to 5 mol % and a mol % of the naphthol ranging from 5 to 95 mol %, each based on the total of the phenol and the naphthol, and a molar ratio of formaldehyde to the total of the phenol and the naphthol {F/(P+N)} ranging from 0.5 to 2.0, in the presence of a metallic element selected from the group consisting of transition metallic elements and metallic elements of Group IIa, Group IIIa, Group IVa, Group Va and Group VIa of the Periodic Table and in the presence of an acid.
Dependencies are inferred from the claim text.