Highly reactive modified phenolic resin and molding material for

Details Highly reactive modified phenolic resin and molding material for Highly reactive modified phenolic resin and molding material for

1999-09-22

2000-12-26

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524 59, 524 65, 524 66, 528129, 530203, 530204, 530210, 530211, 530266, C08G 6348, C08G 6391

Patent

active

061661317

ABSTRACT:
Disclosed is a process for producing a highly reactive modified phenolic resin, which comprises mixing a heavy oil or pitch with 0.3 to 10 mol of a phenol, 0.2 to 9 mol in terms of formaldehyde, of a formaldehyde compound and 0.01 to 3.0 mol of an acid catalyst, each amount being based on 1 mol of the heavy oil or pitch calculated from an average molecular weight; and heating the resulting mixture with stirring, thereby to polycondensate the heavy oil or pitch, phenol and formaldehyde compound. According to this invention, there can be provided a process for producing simply and stably a highly reactive modified phenolic resin having low melt viscosity, excellent heat resistance and high reactivity with an epoxy resin, in one step.

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