US4032483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyurethanes from bark
Assignee: Champion International Corp
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Filing: 1976-04-20
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Granted: 1977-06-28
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Expires: 1996-04-20
Abstract
Abstract Polyurethane compositions formed by the reaction of polyisocyanate with bark and/or bark components such as tannins, as the source of polyol. Mixtures of bark material with conventional polyols, with the bark material comprising at least 30% by weight, may also be used. Polyurethane foams prepared by this process possess a high degree of thermal stability and are fire-retardant.
Inventors
- 👤 Seymour Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6492; C08G18/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
30 words
In a process for the production of rigid compositions in which polyisocyanate is reacted with polyol to produce polyurethane, the improvement comprising employing bark or bark components as the polyol.
Claim 2
Dependent Claim
30 words
In a process for the production of rigid compositions in which polyisocyanate is reacted with polyol to produce polyurethane, the improvement comprising employing bark or bark components as the polyol.
Claim 3
Dependent Claim
11 words
The process of claim 1, wherein the bark component comprises tannin.
Claim 4
Dependent Claim
12 words
The process of claim 1, wherein the polyol comprises particulate wood bark.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the wood bark particles have a mesh size of between 50 and 325.
Claim 6
Dependent Claim
36 words
The process of claim 1, wherein the reaction occurs in the presence of sufficient blowing agent, catalyst and surfactant to yield a urethane foam having a density of between 1 and 40 pounds per cubic foot.
Claim 7
Dependent Claim
20 words
The process of claim 1, in which the polyol comprises at least 30% by weight of bark or its components.
Claim 8
Dependent Claim
21 words
The process of claim 1, in which the polyol comprises from 50 to 100% by weight of bark or its components.
Claim 9
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 10
Dependent Claim
9 words
The product produced by the process of claim 4.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 5.
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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |