Resins for use in forming fast curing wood laminating adhesives

Details Resins for use in forming fast curing wood laminating adhesives Resins for use in forming fast curing wood laminating adhesives

C - Chemistry, Metallurgy

08

G

400/7312

C08G 8/24 (2006.01) C08L 61/06 (2006.01) C09J 161/06 (2006.01) C08L 29/04 (2006.01)

Patent

CA 1279740

85C8 Abstract A phenol-resorcinol-formaldehyde resln and a method for making the same. In this method phenol and formaldehyde at an initial pH of 8.5 to 9,2 are reacted in the presence of a sodium sulfite catalyst. The reaction mix- ture is heated and refluxed until it has a viscosity of u - v on the Gardner bubble test. Additional resorcinol is added to the mixture and refluxing is continued until it has a viscosity of 30 to 100 Gardner seconds.. The reaction mixture is diluted with a water miscible solvent to obtain a a resin solution having a solids content of about 40 to 60 percent by weight and a viscosity of 2.0 to 3.5 poise. An alkali metal carbonate material in the amount of 4 to 8 percent by weight of the resin is added to make adhesives including this resin fast curing. Fumed silica is also added to the resin solution by means of high shear apparatus to make the solution thixotropic.

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