Formo-phenolic foams and their process of preparation

Details Formo-phenolic foams and their process of preparation Formo-phenolic foams and their process of preparation

C - Chemistry, Metallurgy

08

J

403/54

C08J 9/14 (2006.01) C08J 9/04 (2006.01) C08L 61/10 (2006.01)

Patent

CA 1051149

ABSTRACT OF THE DISCLOSURE A process for the production of a phenol-formaldehyde foam includes reacting phenol with formaldehyde in the presence of an alkali, removing or neutralizing the alkali, and con- centrating the resulting resol to form a product having a dry extract content of at least 85% and a viscosity at 20°C between 10,000 and 100,000 poises. The product is then mixed at a temperature in the range of from about 50°C to about 70°C with a blowing agent and a low activity acid catalyst, the catalyst being phosphoric acid, the acid sulphate of triethylene glycol or oxalic acid, and the mixture is expanded and hardened at a temperature in the range of from about 80°C to about 100°C.

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