US3956207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic adhesives
Assignee: Georgia-Pacific LLC
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Filing: 1974-02-25
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Granted: 1976-05-11
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Expires: 1994-02-25
Abstract
Abstract A ready-to-use phenolic adhesive for the manufacture of plywood containing heat treated spent sulfite liquor solids is described. The spent sulfite liquor solids are heat treated in a dry form until from 20% to 50% of the dry heated solids are insoluble in an aqueous 0.5 molar sodium carbonate solution.
Inventors
- 👤 Kenneth A. E. Blackmore
- 👤 Albert W. Stout, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:45
CPC Classifications
C; C09; C09J; C09J161/00; C09J161/04; C09J161/06; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/26; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/3196
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
68 words
Thermosetting plywood adhesive comprising a water-soluble phenol-aldehyde resin intermixed under alkaline conditions with a heat-treated lignosulfonate in an amount sufficient to improve the moisture retention properties of the adhesive, said heat-treated lignosulfonate being heated in the dry state at a temperature in the range of 350° to 625°F until from 20% to 50% of the dry heated lignosulfonate is insoluble in an aqueous 0.5 molar sodium carbonate solution.
Claim 2
Dependent Claim
68 words
Thermosetting plywood adhesive comprising a water-soluble phenol-aldehyde resin intermixed under alkaline conditions with a heat-treated lignosulfonate in an amount sufficient to improve the moisture retention properties of the adhesive, said heat-treated lignosulfonate being heated in the dry state at a temperature in the range of 350° to 625°F until from 20% to 50% of the dry heated lignosulfonate is insoluble in an aqueous 0.5 molar sodium carbonate solution.
Claim 3
Dependent Claim
46 words
A composition of claim 1 wherein the lignosulfonate is spent sulfite liquor solids heated at a temperature in the range of 425° to 525°F and intermixed in an amount of from 2 to 25 percent of the weight of the phenol and aldehyde in the adhesive.
Claim 4
Dependent Claim
18 words
A composition according to claim 2 wherein the spent sulfite liquor solids are heat-treated in sodium salt form.
Claim 5
Dependent Claim
57 words
A composition according to claim 3 wherein the phenolaldehyde resin is a phenol-formaldehyde resin having a mole ratio of phenol to formaldehyde of 1:1.6 to 1:2.5 and the spent sulfite liquor solids are heated at a temperature in the range of 425° to 525°F until from 30 to 40 percent of the dry heated solids are insoluble.
Claim 6
Dependent Claim
36 words
A composition according to claim 2 wherein the heat-treated spent sulfite liquor is added to phenol and aldehyde and the mixture heated under alkaline conditions to condense the phenol and aldehyde to form the phenol-aldehyde resin.
Claim 7
Dependent Claim
19 words
A composition according to claim 5 wherein the lignosulfonate is spent sulfite liquor solids heat-treated in sodium salt form.
Claim 8
Dependent Claim
19 words
A composition according to claim 5 wherein the lignosulfonate is a spent sulfite liquor heat-treated in calcium salt form.
Claim 9
Dependent Claim
94 words
A process for the preparation of a stable thermosetting adhesive composition of phenol-aldehyde resin which comprises intermixing a heat-treated lignosulfonate with the phenol and aldehyde in an amount of from 2 to 25 percent of the weight of the phenol and aldehyde, and heating the mixture under alkaline conditions to condense the phenol with the aldehyde, said heat-treated lignosulfonate being heated in a dry state at a temperature in the range of from 350° to 625°F until from 20% to 50% of the lignosulfonate is insoluble in an aqueous 0.5 molar sodium carbonate solution.
Claim 10
Dependent Claim
94 words
A process for the preparation of a stable thermosetting adhesive composition of phenol-aldehyde resin which comprises intermixing a heat-treated lignosulfonate with the phenol and aldehyde in an amount of from 2 to 25 percent of the weight of the phenol and aldehyde, and heating the mixture under alkaline conditions to condense the phenol with the aldehyde, said heat-treated lignosulfonate being heated in a dry state at a temperature in the range of from 350° to 625°F until from 20% to 50% of the lignosulfonate is insoluble in an aqueous 0.5 molar sodium carbonate solution.
Claim 11
Dependent Claim
26 words
A process according to claim 8 wherein the phenolaldehyde resin is a phenol-formaldehyde resin having a mole ratio of phenol to formaldehyde of 1:1.6 to 1:2.5.
Claim 12
Dependent Claim
59 words
A process according to claim 9 wherein the lignosulfonate is spent sulfite liquor in sodium salt form heated at a temperature in the range of 425° to 525°F in a dry state until from 30% to 40% of the dry heated spent sulfite liquor solids are insoluble and is intermixed in an amount of from 10 to 15 percent.
Claim 13
Dependent Claim
60 words
A process according to claim 9 wherein the lignosulfonate is a spent sulfite liquor in calcium salt form heated at a temperature in the range of 425° to 525°F in a dry state until from 30% to 40% of the dry heated spent sulfite liquor solids are insoluble and is intermixed in an amount of from 10 to 15 percent.
Claim 14
Dependent Claim
27 words
In a process for the lamination of plys of veneer in the manufacture of plywood, the improvement of using as an adhesive the composition of claim 1.
Claim 15
Dependent Claim
27 words
In a process for the lamination of plys for veneer in the manufacture of plywood, the improvement of using as an adhesive the composition of claim 3.
Claim 16
Dependent Claim
27 words
In a process for the lamination of plys for veneer in the manufacture of plywood, the improvement of using as an adhesive the composition of claim 5.
Claim 17
Dependent Claim
9 words
A laminate prepared by the process of claim 12.
Claim 18
Dependent Claim
9 words
A laminate prepared by the process of claim 13.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |