C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/54
C08J 9/06 (2006.01) C08G 14/06 (2006.01) C08J 9/14 (2006.01) C08K 5/16 (2006.01) C08K 13/02 (2006.01)
Patent
CA 1210898
Abstract of the Disclosure Phenolic foams and a method of producing phenolic foam material from phenol-formaldehyde resins having a phenol to formaldehyde mole ratio of between about 1:3 and 1:4.5 are described. These materials are useful for insulation and other uses, particularly in the building trades. They are dimensionally and thermally stable, fire resistant and low in cost. Phenolic foams are generally obtained by cross-linking a suitable phenolic resin by means of a catalyst in the presence of a blowing agent and a surfactant. The high mole ratio resins disclosed herein are modified with formaldehyde co-reactants in order to form a useful foam. Co-reactants for formaldehyde used according to the invention are urea, melamine and dicyandiamide, or combinations of these materials. The most preferred co-reactant and the lowest cost material is urea. Resins with phenol to formaldehyde mole ratios of from 1:3 to 1:4.5 according to the invention can be reacted with these co-reactants in relatively large quantities. The modified phenol-formaldehyde resins can be converted into a foam material which, surprisingly, exhibits pro- perties superior to those of foam based on a regular unmodified phenol-formaldehyde resin.
416254
Macpherson Edwin J.
Ng Norman H.
Rastall Mary H.
Fiberglas Canada Inc.
Gowling Lafleur Henderson Llp
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