US4396673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods for the manufacture of particle board utilizing an isocyanate binder and mineral wax release agent in an aqueous emulsion
Assignee: Huntsman International LLC
•
Filing: 1981-08-03
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Granted: 1983-08-02
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Expires: 2001-08-03
Abstract
Abstract Sheets or moulded bodies, for example particle board, are manufactured by hot pressing a lignocellulosic material in contact with an organic polyisocyanate and a wax release agent which is a vegetable wax, a modified vegetable oil, a microcrystalline wax or a mineral wax, said wax release agent having a melting point of at least 70° C. Preferably the wax release agent is applied to the lignocellulosic material in the form of a dispersion in an aqueous emulsion of the polyisocyanate. The process facilitates the release of the sheets or moulded bodies from the caul plates or platens of the press.
Inventors
- 👤 George W. Ball
- 👤 James P. Brown
- 👤 Graham Gibbins
- 👤 Robert S. Hampson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:37
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; B; B27; B27N; B27N3/00; B27N3/08; B27N3/083; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T428/31801; Y10T428/31804
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A process for the continuous manufacture of sheets or moulded bodies which comprises hot pressing a ligno-cellulosic material in contact with an aqueous dispersion consisting essentially of an organic polyisocyanate and a wax release agent which is a mineral wax having a melting point of at least 70°, whereby there is achieved release of successive batches of said ligno-cellulosic material from metal parts of the press with which it comes into contact during the hot pressing.
Claim 2
Dependent Claim
76 words
A process for the continuous manufacture of sheets or moulded bodies which comprises hot pressing a ligno-cellulosic material in contact with an aqueous dispersion consisting essentially of an organic polyisocyanate and a wax release agent which is a mineral wax having a melting point of at least 70°, whereby there is achieved release of successive batches of said ligno-cellulosic material from metal parts of the press with which it comes into contact during the hot pressing.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein the wax release agent is montan wax.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein the ratio of the organic polyisocyanate to the ligno-cellulosic material is in the range 0.1:99.9 to 20:80 by weight.
Claim 5
Dependent Claim
26 words
A process according to claim 3 wherein the ratio of the organic polyisocyanate to the ligno-cellulosic material is in the range 0.5:99.5 to 7.0:93.0 by weight.
Claim 6
Dependent Claim
27 words
A process according to claim 1 wherein the ratio of the wax release agent to the ligno-cellulosic material is in the range 0.001:99.9 to 10:90 by weight.
Claim 7
Dependent Claim
25 words
A process according to claim 5 wherein the ratio of the wax release agent to the ligno-cellulosic material is in the range 0.1:99.9 to 2.0:98.0.
Claim 8
Dependent Claim
16 words
Sheets or moulded bodies whenever prepared by a process according to any of the preceding claims.
Claim 9
Dependent Claim
49 words
An aqueous emulsion of an organic polyisocyanate having dispersed therein a wax release agent consisting essentially of mineral wax, said wax release agent having a melting point of at least 70° C. and being capable of releasing successive batches of ligno-cellulosic material from metal press parts after hot pressing.
Claim 10
Dependent Claim
49 words
An aqueous emulsion of an organic polyisocyanate having dispersed therein a wax release agent consisting essentially of mineral wax, said wax release agent having a melting point of at least 70° C. and being capable of releasing successive batches of ligno-cellulosic material from metal press parts after hot pressing.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |