Polymer-aldehyde binding system for manufacture of wood products
AssigneeDynea Oy
InventorsElena Pisanova, Humayun Mandal
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Abstract
A formaldehyde-free curable aqueous composition containing a hydroxy-containing polymer, a multi-functional crosslinking agent, and, optionally, a catalyst. The composition is used as a binder for lignocellulosic materials such as plywood, fiber particleboard, medium density fiberboard and oriented strand board.
Claims19
1) A curable aqueous composition for bonding lignocellulosic material comprising:
- (a) a hydroxy-containing polymer;
- (b) a multi-functional crosslinking agent which is at least one selected from the group consisting of a multifunctional aldehyde and a derivative thereof, and optionally
- (c) a catalyst;
- wherein the weight ratio of (a):(b) is from 95:5 to about 10:90.
9) The curable aqueous composition of claim 17, wherein pH is in the range of about 2.5 to about 6.0.
12) A composite product comprising a lignocellulosic material and a cured adhesive, wherein the cured adhesive is prepared by curing an aqueous composition comprising:
- (a) a hydroxy-containing polymer;
- (b) a multi-functional crosslinking agent which is at least one selected from the group consisting of a multifunctional aldehyde and a derivative thereof, and optionally
- (c) a catalyst;
- wherein the weight ratio of (a):(b) is from 95:5 to about 10:90.
16) A method of forming a composite product, comprising applying a curable aqueous composition to lignocellulosic material and curing to form the composite product, wherein the curable aqueous composition comprises:
- (a) a hydroxy-containing polymer;
- (b) a multi-functional crosslinking agent which is at least one selected from the group consisting of a multifunctional aldehyde and a derivative thereof, and optionally
- (c) a catalyst;
- wherein the weight ratio of (a):(b) is from 95:5 to about 10:90.
Dependencies are inferred from the claim text.