C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/55, 18/677
C08J 9/00 (2006.01) B01F 1/00 (2006.01) C08L 61/24 (2006.01)
Patent
CA 1103849
ABSTRACT The present specification discloses the production of low density self-sustaining foams of cured urea/formaldehyde resin material. Such foams can be used, for example, in the building industry for thermal insulation purposes. The invention disclosed is a method of producing a cured urea/formaldehyde resin foam having a shrinkage on drying of less than 20% by volume, the method including the step of forming a homogeneous wet foam from an aqueous resin solution and an aqueous solution of a hardener for the resin, so that the freshly made wet foam has a total reactive resin solids content of at least 35% by weight. In another aspect the invention disclosed is an apparatus for carrying out such a method, the apparatus including a foaming column having an upstream region constituted by inert particulate material and a downstream region constituted by an inert reticulated structure.
287010
British Industrial Plastics Limited
Gowling Lafleur Henderson Llp
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