US4608111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding method employing an adhesive which contains in an aqueous base an effective amount of a polyvinyl alcohol and a lignin sulfonate
Assignee: HB Fuller Licensing and Financing Inc
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Filing: 1985-09-09
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Granted: 1986-08-26
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Expires: 2005-09-09
Abstract
Abstract An aqueous adhesive possessing sufficient adhesion, tack, open time, thermal stability, biological stability, dimensional stability, flexibility and adhesion contains in an aqueous base a polyvinyl alcohol and lignin sulfonate, wherein there are about 1 to 8 parts of the lignin sulfonate per each part of the polyvinyl alcohol.
Inventors
- 👤 Robert M. Hume, III
- 👤 Robert A. LaBrash
- 👤 Michael J. Vander Giessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:57
CPC Classifications
C; C09; C09J; C09J129/00; C09J129/02; C09J129/04; C09J197/00; C09J197/005; C08; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A method of laminating a first sheet to a second sheet which comprises: A. forming a non-bonded laminate by placing between said first sheet and said second sheet a thin film comprising (a) an ammonium or alkali metal lignin sulfonate composition; (b) a polyvinyl alcohol composition; and (c) cellulosic fiber; wherein there are about 1 to 8 parts by weight of the lignin sulfonate composition per each part by weight of the polyvinyl alcohol composition and the cellulosic fiber is present at a concentration of about 0.1 to 10 wt-% of the film; and B. applying heat to the non-bonded laminate.
Claim 2
Independent Claim
101 words
A method of laminating a first sheet to a second sheet which comprises: A. forming a non-bonded laminate by placing between said first sheet and said second sheet a thin film comprising (a) an ammonium or alkali metal lignin sulfonate composition; (b) a polyvinyl alcohol composition; and (c) cellulosic fiber; wherein there are about 1 to 8 parts by weight of the lignin sulfonate composition per each part by weight of the polyvinyl alcohol composition and the cellulosic fiber is present at a concentration of about 0.1 to 10 wt-% of the film; and B. applying heat to the non-bonded laminate.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the film also contains a humectant-plasticizer.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the humectant-plasticizer is a polyhydroxy compound.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the cellulosic fiber is wood pulp, cotton fiber or mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |