Storage stable melamine-urea-formaldehyde resins and...

C - Chemistry – Metallurgy – 08 – G

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C08G 12/38 (2006.01) B29C 33/56 (2006.01) C08L 61/30 (2006.01)

Patent

CA 2726459

Melamine-urea-formaldehyde resins may be prepared using processes including a first cook stage, a second cook stage, and a final addition wherein: the molar ratio of formaldehyde to urea and melamine (F: U + M) in the first cook stage is from about 2.0 to about 5.0; and the molar ratio of formaldehyde to urea and melamine (F: U + M) in the second cook stage is from about 1.5 to 3.0; and the molar ratio of formaldehyde to urea and melamine (F: U + M) in the final addition from about 0.4 to 0.70.

Linvention concerne des résines mélamine-urée-formaldéhyde qui peuvent être préparées en utilisant des procédés qui incluent une première étape de cuisson, une seconde étape de cuisson et une addition finale. Selon linvention, le rapport molaire entre le formaldéhyde et lurée et la mélamine (F:U + M) lors de la première étape de cuisson est denviron 2,0 à environ 5,0 ; et le rapport molaire entre le formaldéhyde et lurée et la mélamine (F:U + M) lors de la seconde étape de cuisson est denviron 1,5 à 3,0 ; et le rapport molaire entre le formaldéhyde et lurée et la mélamine (F:U + M) lors de laddition finale est denviron 0,4 à 0,70.

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