Phenolic resin with low level of free bisphenol

Details Phenolic resin with low level of free bisphenol Phenolic resin with low level of free bisphenol

2006-11-09

2010-02-16

Sellers, Robert (Department: 1796)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C525S481000, C525S510000, C528S141000, C528S142000, C528S143000, C528S147000, C528S153000

Reexamination Certificate

active

07662902

ABSTRACT:
A phenolic resin having not more than5wt% of free bisphenol and a molecular weight distribution Mw/Mn of not more than2.0is prepared by reacting a bisphenol and aldehyde in the presence of an alkaline catalyst at a temperature of from0° C. to100° C., neutralizing with an acid, adding an acid to adjust the pH to from0to6, heating to a temperature of from50° C. to200° C, and vacuuming to recover the phenolic resin.

REFERENCES:
patent: 4278579 (1981-07-01), Murphy
patent: 4722982 (1988-02-01), Tanaka
patent: 62-15216 (1987-01-01), None
patent: 62-15217 (1987-01-01), None

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