Sulfite spent liquor-urea formaldehyde resin adhesive product

The method of making an adhesive product comprising combining, in substantially uncondensed admixture, spent acid sulfite pulping liquor and urea formaldehyde resin in the following proportions, expressed in parts by weight, dry solids basis:

• Urea-Formaldehyde Resin:
• 50-90
• Spent Liquor from the Acid Sulfite Pulping of Lignocellulose:
• 10-50
• the adhesive product containing from 0.2 to 4.0% by weight of ammonium ion (expressed as NH.sub.3) on a spent liquor solids basis,
• the spent liquor component of the mixture prior to mixing having a pH of from 3 to 9,
• the urea formaldehyde resin component of the mixture prior to mixing being characterized by a molar ratio of formaldehyde to urea of from 1.0-1.8 to 1;
• a pH of from 6-8, and a methylol content corresponding to a Witte number of from 1.0 to 1.8.

The method of making glued wood products which comprises applying to the surfaces of pieces of wood of bonding quantity of adhesive comprising in substantially uncondensed admixture with each other, and in parts by weight, dry solids basis:

• Urea-Formaldehyde Resin:
• 50-90
• Spent Liquor from the Acid Sulfite Pulping of Lignocellulose:
• 10-50
• the adhesive containing from 0.2 to 4.0 % by weight ammonium ion (expressed as NH.sub.3) on a spent liquor solids basis,
• the sulfite liquor component of the mixture prior to mixing having a pH of from 3-9,
• the urea formaldehyde resin component of the mixture prior to mixing being characterized by a molar ratio of formaldehyde to urea of from 1.0-1.8 to 1;
• a pH of from 6-8;
• and a methylol content corresponding to a Witte number of from 1.0 to 1.8 assembling and hot pressing the resulting adhesive-coated pieces of wood to form the glued wood product.