Phenolic novolaks and process for production thereof

Details Phenolic novolaks and process for production thereof Phenolic novolaks and process for production thereof

2007-07-10

2007-07-10

Truong, Duc (Department: 1711)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S056000, C528S129000, C528S141000, C528S144000, C528S155000, C528S398000, C528S486000, C528S487000

Reexamination Certificate

active

10494362

ABSTRACT:
A process for production of phenolic novolak which comprises the step of conducting heterogeneous reaction of a phenol with 0.40 to 0.93 mol of an aldehyde per mol of the phenol in the presence of at least 25 parts by mass of a phosphoric acid per 100 parts by mass of the phenol. This process can give in high yield phenolic novolak with the contents of monomeric and dimeric phenols and a degree of dispersion controlled.

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