Polymerization-enhancing composition for urea-formaldehyde...

C - Chemistry – Metallurgy – 08 – G

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C08G 12/12 (2006.01) C08L 61/24 (2006.01) C08L 97/02 (2006.01)

Patent

CA 2575337

An aqueous reaction product of a composition that may consist essentially of a source of an acid having a pKa in water of about 2 to about 8, a source of a base having a pKb in water of about 2 to about 6, and urea. A curable urea/formaldehyde resin composition may contain a curable urea/formaldehyde resin and the foregoing composition, and may be made by combining the resin with the composition. A reconstituted wood product may be made by combining particulate lignocellulosic material with the foregoing curable resin, and curing the resin. Optionally, a reconstituted wood panel may contain a particulate lignocellulosic material and a binder composition comprising the cured product of curable resin and the aforesaid aqueous reaction product. A concentrate for forming a polymerization enhancing composition may consist essentially of a source of aforesaid acid, a source of aforesaid base, and urea.

L~invention porte sur un produit de réaction aqueux d~une composition pouvant comprendre essentiellement une source d~un acide ayant un pKa dans l~eau d~environ 2 à environ 8, une source d~une base ayant un pKb dans l~eau d~environ 2 à environ 6, et de l~urée. Une composition de résine vulcanisable d~urée/formaldéhyde peut contenir une résine vulcanisable d~urée/formaldéhyde et la composition précédente, et peut s~obtenir en combinant la résine avec la composition. Un produit de bois reconstitué peut s~obtenir en combinant un matériau de lignocellulose particulaire avec la résine vulcanisable ci-dessus, et en cuisant la résine. En option, un panneau de bois reconstitué peut contenir un matériau de lignocellulose particulaire et une composition de liant comprenant le produit cuit de résine vulcanisable et le produit de réaction aqueux ci-dessus. Un concentré pour la formation d~une composition de promotion de polymérisation peut comporter essentiellement une source de l~acide ci-dessus, une source de la base ci-dessus et de l~urée.

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