Phenolic adhesives

Claim 2

A THERMOSETTING PHENOL-ALDEHYDE ADHESIVE COMPOSITION COMPRISING A WATER-SOLUBLE PHENOL-ALDEHYDE RESIN INTERMIXED WITH A POLYMERIZED LIGNOSULFONATEIN AN AMOUNT SUFFICIENT TO IMPROVE THE ASSEMBLY TIME OF THE ADHESIVE, SAID POLYMERIZED LIGNOSULFONATE BEING A LIGNOSULFONATE REACTED WITH A SUFFICIENT AMOUNT OF A CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF ALIPHATIC AND HETEROCYCLIC ALDEHYDES HAVING UP TO 6 CARBON ATOMS, EPICHLOROHYDRIN, EPIBROMOHYDRIN, AND POLY-EPOXIDES HAVING NOT MORE THAN 10 CARBON ATOMS TO POLYMERIZE THE LIGNOSULFONATE TO THE THAT FROM 30 TO 80 PERCENT OF THE POLYMERIZED LIGNOSULFONATE IS INSOLUBLE IN A 5 PERCENT SODIUM CARBONATE AQUEOUS SOLUTION.

Claim 3

A composition of claim 1 wherein the lignosulfonate is polymerized to the extent that from 45 to 65 percent of the product is insoluble and is added in an amount of from 2 to 25 percent of the weight of the phenol and aldehyde used.

Claim 4

A composition according to claim 1 wherein the adhesive is a plywood adhesive of phenol-formaldehyde resin condensed under alkaline conditions.

Claim 5

A composition according to claim 3 wherein the lignosulfonate is polymerized to the extent that from 45 to 65 percent of the product is insoluble.

Claim 6

A composition according to claim 4 wherein the cross-linking agent is an aldehyde.

Claim 7

A composition according to claim 5 wherein the aldehyde is formaldehyde.

Claim 8

A composition according to claim 4 wherein the cross-linking agent is epichlorohydrin.

Claim 9

A composition according to claim 4 wherein the cross-linking agent is a polyepoxide having no more than 10 carbon atoms.

Claim 10

A composition according to claim 8 wherein the polyepoxide is a butanediol diglycidyl ether.

Claim 11

A process for the preparation of a thermosetting adhesive composition of phenol-aldehyde resin which comprises, intermixing phenol and an aldehyde with a polymerized lignosulfonate in an amount of from 2 to 25 weight percent of the phenol and aldehyde, and heating the mixture to condense the phenol with the aldehyde, said polymerized lignosulfonate being a lignosulfonate reacted with a sufficient amount of a cross-linking agent selected from the group consisting essentially of aliphatic and heterocyclic aldehydes having up to 6 carbon atoms, epichlorohydrin, epibromohydrin, and polyepoxides having not more than 10 carbon atoms to polymerize the lignosulfonate to the extent that from 30 to 80% of the polymerized lignosulfonate is insoluble in a 5% carbonate aqueous solution.

Claim 12

A process for the preparation of a thermosetting adhesive composition of phenol-aldehyde resin which comprises, intermixing phenol and an aldehyde with a polymerized lignosulfonate in an amount of from 2 to 25 weight percent of the phenol and aldehyde, and heating the mixture to condense the phenol with the aldehyde, said polymerized lignosulfonate being a lignosulfonate reacted with a sufficient amount of a cross-linking agent selected from the group consisting essentially of aliphatic and heterocyclic aldehydes having up to 6 carbon atoms, epichlorohydrin, epibromohydrin, and polyepoxides having not more than 10 carbon atoms to polymerize the lignosulfonate to the extent that from 30 to 80% of the polymerized lignosulfonate is insoluble in a 5% carbonate aqueous solution.

Claim 13

A process according to claim 10 wherein the phenol and the aldehyde are phenol and formaldehyde intermixed in a mole ratio of phenol to formaldehyde of 1:1.6 to 1:2.5 and condensed under alkaline conditions.

Claim 14

A process according to claim 11 wherein a lignosulfonate is polymerized with formaldehyde until from 45 to 65 percent of the polymerized product is insoluble.

Claim 15

A process according to claim 12 wherein the polymerized lignosulfonate is a polymerized spent sulfite liquor and is added in an amount from 10 to 20 weight percent of the phenol and formaldehyde.

Claim 16

In a process for the lamination of plys of veneer in a manufactured plywood, the improvement of using as an adhesive the composition of claim 1.

Claim 17

In a process for lamination of plys for veneer in manufacture of plywood, the improvement of using as an adhesive the composition of claim 3.

Claim 18

In a process for lamination of plys for veneer in the manufacture of plywood the improvement of using as an adhesive the composition prepared by the process of claim 13.

Claim 19

A laminate prepared by claim 14.

Claim 20

A laminate prepared by claim 15.

Claim 21

A laminate prepared by claim 16.