Process for the preparation of urea-formaldehyde sizing...

C - Chemistry – Metallurgy – 08 – G

Patent

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400/7348, 154/95

C08G 12/12 (2006.01) C08L 97/02 (2006.01) C09J 161/24 (2006.01) C08L 61/24 (2006.01)

Patent

CA 1130488

ABREGE DESCRIPTIF La présente invention concerne un procédé de préparation de colles urée-formaldéhyde et les colles ainsi obtenues. Selon l'invention, on mélange un sel inorganique à une source de formaldéhyde, on chauffe et on fair réagir avec de l'urée pour provoquer un début de polymérisation en milieu acide, on arrête la réaction de polymérisation lorsque le mélange a atteint la viscosité desirée, on refroidit le mélange, on ajoute de l'urée au mélange au cours du refroidissement et on obtient la colle après refroidissement. Les colles obtenues sont utiles à la fabrication de panneaux de bois agglomérés ou contreplaqués.

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