Low formaldehyde emission urea-formaldehyde resins...

Details Low formaldehyde emission urea-formaldehyde resins... Low formaldehyde emission urea-formaldehyde resins...

B - Operations, Transporting

29

C

400/7332, 402/81

B29C 65/52 (2006.01) C09J 5/00 (2006.01)

Patent

CA 1241489

TITLE OF THE INVENTION: Low Formaldehyde Emission Urea-Formaldehyde Resins Containing a Melamine Additive ABSTRACT OF THE DISCLOSURE: A melamine-urea-formaldehyde resin characterized by a low- rate of formaldehyde emission when cured. Made by a process where the initial reaction mixture has an F/U molar ratio of from about 3:1 to about 1:1, and undergoes a methylolation reaction at an alkaline pH. Preferably at least some of the melamine is present in the initial reaction mixture. The subsequent condensation is at a substantially neutral pH. Has a final F/U molar ratio of 1.3:1 to 0.9:1, a final F/Ueq molar ratio of 1.3:1 to 0.7:1, and a melamine content of from 0.15% to 40% by weight, dry solids basis. Useful for adhesive purposes, particularly as a particleboard binder characterized by low emission rate.

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