Process for hardening phenolic resins

Details Process for hardening phenolic resins Process for hardening phenolic resins

1992-10-13

1995-01-03

Lilling, Herbert J.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525500, 528129, 528167, 523145, 523147, C08G 804

Patent

active

053787935

ABSTRACT:
This invention relates to a hardener for producing phenolic resins from phenolic resoles which comprises a partial phosphate ester. The hardener is produced by reacting condensed phosphoric acids with polyols at controlled temperatures with vigorous agitation under vacuum until constant acidity is achieved. The hardeners cure the phenolic resoles relatively slowly and therefore enable better control to be achieved when preparing moulded products.

REFERENCES:
patent: Re32812 (1988-12-01), Lemon et al.
patent: 4246157 (1979-03-01), Laitar
patent: 4331583 (1982-05-01), Everett
patent: 4622173 (1986-11-01), Broze et al.
patent: 4661280 (1987-04-01), Ouhadi et al.
patent: 4786431 (1988-11-01), Broze et al.
patent: 5057238 (1991-10-01), Broze et al.

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