Process for producing quick-curing phenolic resin

Details Process for producing quick-curing phenolic resin Process for producing quick-curing phenolic resin

1980-06-11

1981-11-10

Schain, Howard E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528140, 528144, C08G 810

Patent

active

042999472

ABSTRACT:
A high-ortho phenolic novolac resin having excellent curability, heat stability and flowability can be produced safely at low cost by a process which comprises reacting a phenol and an aldehyde at a temperature of more than 100.degree. C. with (A) a catalyst effective for the addition reaction selected from the salts of divalent metals in combination with (B) a catalyst effective for the condensation reaction, or comprises reacting a phenol and an aldehyde under reflux in the presence of the catalyst (A), adding an acid to adjust the pH to 1-5, removing water under reduced pressure and then subjecting the product to reaction at a temperature of more than 100.degree. C. This process enables the addition reaction and the condensation reaction to proceed with a good balance, can solve problems arising in the prior process such as gelation, low yield and the like, and can produce a high-ortho type phenolic novolac resin safely at low cost. Accordingly, this process is quite advantageous in industry.

REFERENCES:
patent: 2464207 (1949-03-01), Bender et al.
patent: 2475587 (1949-07-01), Bender et al.
patent: 3422068 (1969-01-01), Kreibich et al.
patent: 3476707 (1969-11-01), Culbertson et al.
patent: 4097463 (1978-06-01), Culbertson
patent: 4113700 (1978-09-01), Culbertson
Modern Plastics, Feb. 1953, pp. 136, 138, 220, 222, Bender.
Modern Plastics, Mar. 1954, pp. 115-116, 118 & 200, Bender.

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