Patent US4940741A successfully refreshed from Google Patents.
US4940741A
Expired / Lapsed
US
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Process for the production of hardboard
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1988-06-17
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Granted: 1990-07-10
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Expires: 2008-06-17
Abstract
Abstract A one-step process for simultaneously compressing and tempering fiberboard panel, which includes the step of applying to the panel prior to compression thereof an aqueous treating composition which comprises a polyvinyl acetate emulsion and optionally up to 40% of a hydrocarbon emulsion, up to 3% of a fluid, water-soluble organosilicone polymer, or up to 5% by weight of a starch crosslinking agent. The polyvinyl acetate emulsion is prepared in the presence of 6-10% by weight of a starch stabilizer selected from the group consisting of derivatized starches and/or converted starches and 0.5-1.5% of a surfactant. The preferred emulsions are polymerized in the presence of alkenyl succinate starches, most preferably octenyl succinate waxy maize starches.
Inventors
- 👤 Dennis R. De Wacker
- 👤 Leon Rosenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:24
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08; B; B27; B27N; B27N1/00; B27N1/006; C08L; C08L97/00; C08L97/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
129 words
A one step process for simultaneously compressing and tempering a fiberboard panel, which comprises the step of applying to the panel prior to compression thereof an aqueous treating composition which consists essentially of (a) a polyvinyl acetate emulsion, characterized in that the emulsion is prepared in the presence of about 6-10% by weight of a starch stabilizer selected from the group consisting of a derivatized starch, a converted starch, and a derivatized and converted starch and 0.5-1.5% of a surfactant, the stabilizer and surfactant percentages being by weight based on the total weight of the monomers, (b) up to 40% of a hydrocarbon emulsion, and (c) up to 5% of a crosslinking agent, the percentage of (b) and (c) being by weight of the treating composition and totaling 100%.
Claim 2
Dependent Claim
129 words
A one step process for simultaneously compressing and tempering a fiberboard panel, which comprises the step of applying to the panel prior to compression thereof an aqueous treating composition which consists essentially of (a) a polyvinyl acetate emulsion, characterized in that the emulsion is prepared in the presence of about 6-10% by weight of a starch stabilizer selected from the group consisting of a derivatized starch, a converted starch, and a derivatized and converted starch and 0.5-1.5% of a surfactant, the stabilizer and surfactant percentages being by weight based on the total weight of the monomers, (b) up to 40% of a hydrocarbon emulsion, and (c) up to 5% of a crosslinking agent, the percentage of (b) and (c) being by weight of the treating composition and totaling 100%.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein the treating composition comprises about 60-99.5% of the polyvinyl acetate polymer.
Claim 4
Dependent Claim
25 words
The process of claim 1, wherein the starch stabilizer is a derivatized corn, tapioca, or waxy maize starch present in an amount of about 8%.
Claim 5
Dependent Claim
34 words
The process of claim 3, wherein the derivatized starch is a waxy maize starch treated with up to about 3% octenyl succinic anhydride or tapioca starch derivatized with up to about 7% propylene oxide.
Claim 6
Dependent Claim
18 words
The process of claim 1, wherein the starch stabilizer is a converted corn, tapioca, or waxy maize starch.
Claim 7
Dependent Claim
29 words
The process of claim 5, wherein the converted starch stabilizer is an acid-converted or enzyme-converted tapioca or waxy maize starch having a water fluidity of about 18 to 90.
Claim 8
Dependent Claim
15 words
The process of claim 6 wherein the starch has a water fluidity of about 85.
Claim 9
Dependent Claim
15 words
The process of claim 1, wherein the starch stabilizer is a converted and derivatized starch.
Claim 10
Dependent Claim
23 words
The process of claim 8, wherein the starch is converted tapioca starch treated with propylene oxide or corn starch treated with sodium hypochlorite.
Claim 11
Dependent Claim
34 words
The process of claim 9, wherein the tapioca starch has a water fluidity of about 85 and is derivatized with 7% propylene oxide and wherein the oxidized corn starch contained about 0.5% carboxyl groups.
Claim 12
Dependent Claim
17 words
The process of claim 1, wherein the hydrocarbon emulsion is present in an amount of about 1-30%.
Claim 13
Dependent Claim
17 words
The process of claim 1, wherein the crosslinking agent is present in an amount of about 1-5%.
Claim 14
Dependent Claim
14 words
The process of claim 12, wherein the crosslinking agent is gyloxal or methylolated melamine.
Claim 15
Dependent Claim
38 words
The process of claim 1, wherein the aqueous treating composition is applied to at least one side of the fiber panel in an amount of about 0.10-3.0 dry grams per one square foot of the treated panel surface.
Claim 16
Dependent Claim
42 words
The process of claim 1, wherein the aqueous treating composition is applied in an amount of about 0.6-1.8 dry grams per one square foot of the treated panel surface and is applied to one or both sides of the fiber board panel.
Claim 17
Dependent Claim
9 words
The fiberboard produced by the process of claim 1.
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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) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |