US3870665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making pressure molded lignocellulose articles comprising isocyanurate group forming mold release agent
Assignee: Bayer AG
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Filing: 1974-05-09
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Granted: 1975-03-11
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Expires: 1994-05-09
Abstract
Abstract Plywood, fiberboard and other compression molded articles are prepared by compression molding wood chips or other lignocellulose material with an organic polyisocyanate and a catalyst which promotes reaction of isocyanato groups to form isocyanurates.
Inventors
- 👤 Hans-Joachim Diehr
- 👤 Karl-Josef Kraft
- 👤 Hanns Immo Sachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:42
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/02; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08G18/28; C08G18/40; C08G18/54; C08G18/64; C08G18/6484; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/16; C08K5/17; C08K5/34; C08L61/00; C08L61/20; C08L61/26; C08L61/28; C08L2205/00; C08L2205/06; C08L61/22; C08L61/24; C08L75/00; C08L75/04; C08L91/00; C08L91/06; C08L91/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
41 words
IN A PROCESS FOR COMPRESSION MOLDING OF LIGNOCELLULOSECONTAINING MATERIALS WHEREIN AN ORGANIC POLYISOCYANATE IS MIXED WITH THE MATERIALS DURING MOLDING, THE IMPROVEMENT WHICH COMPRISES INCLUDING A CATALYST WHICH PROMOTES ISOCYANURATE FORMATION FROM ISOCYNATES IN THE MIXTURE AS A MOLD RELEASE AGENT.
Claim 2
Dependent Claim
41 words
IN A PROCESS FOR COMPRESSION MOLDING OF LIGNOCELLULOSECONTAINING MATERIALS WHEREIN AN ORGANIC POLYISOCYANATE IS MIXED WITH THE MATERIALS DURING MOLDING, THE IMPROVEMENT WHICH COMPRISES INCLUDING A CATALYST WHICH PROMOTES ISOCYANURATE FORMATION FROM ISOCYNATES IN THE MIXTURE AS A MOLD RELEASE AGENT.
Claim 3
Dependent Claim
41 words
In a process for compression molding of lignocellulose-containing materials wherein an organic polyisocyanate is mixed with the materials during molding, the improvement which comprises including a catalyst which promotes isocyanurate formation from isocynates in the mixture as a mold release agent.
Claim 4
Dependent Claim
41 words
In a process for compression molding of lignocellulose-containing materials wherein an organic polyisocyanate is mixed with the materials during molding, the improvement which comprises including a catalyst which promotes isocyanurate formation from isocynates in the mixture as a mold release agent.
Claim 5
Dependent Claim
14 words
The process of claim 1, wherein the mold release agent is a phenol-Mannich base.
Claim 6
Dependent Claim
12 words
The process of claim 1, wherein the mold release agent is tris-(dimethylaminopropyl)-S-hexahydrotriazine.
Claim 7
Dependent Claim
19 words
The process of claim 1, wherein the mold release agent is an alkali metal salt of a carboxylic acid.
Claim 8
Dependent Claim
40 words
The process of claim 1, wherein the lignocellulose-containing material is a powder or chips and the binder is a mixture of polyisocyanates and 0.1 to 50 parts by weight based on the weight of polyisocyanate of the mold release agent.
Claim 9
Dependent Claim
21 words
The process of claim 5, wherein mixtures which are stable at room temperature composed of polyisocyanates and polyisocyanurate catalysts are used.
Claim 10
Dependent Claim
23 words
The process of claim 1, wherein the surfaces of the material to be molded are sprayed with a polyisocyanurate catalyst prior to molding.
Claim 11
Dependent Claim
29 words
The process of claim 1, wherein the surfaces of the sheets, plates or molds of the press which come into contact with the molding are coated with polyisocyanurate catalysts.
Claim 12
Dependent Claim
13 words
The process according to claim 1, wherein the polyisocyanate is crude diphenylmethane diisocyanate.
Claim 13
Dependent Claim
24 words
The process of claim 1, wherein a urea formaldehyde, melamine formaldehyde or phenol formaldehyde resin is included as a binder together with the polyisocyanate.
Claim 14
Dependent Claim
20 words
The process of claim 1, wherein the materials which contain lignocellulose are treated with protective agents against insects and/or molds.
Claim 15
Dependent Claim
17 words
The process of claim 1, wherein the materials which contain lignocellulose are treated with fireproofing protective agents.
Claim 16
Dependent Claim
9 words
The molded product of the process of claim 1.
Claim 17
Dependent Claim
52 words
In the preparation of molded sheet material by a process wherein particles of a lignocellulose material are wet with an organic polyisocyanate and compression molded, the improvement which comprises including as a mold release agent in the mixture to be molded a catalyst which promotes reaction of isocyanato groups to form isocyanurates.
Claim 18
Dependent Claim
52 words
In the preparation of molded sheet material by a process wherein particles of a lignocellulose material are wet with an organic polyisocyanate and compression molded, the improvement which comprises including as a mold release agent in the mixture to be molded a catalyst which promotes reaction of isocyanato groups to form isocyanurates.
Claim 19
Dependent Claim
15 words
The process of claim 14, wherein the mold release agent is mixed with the polyisocyanate.
References Cited (Backward Citations)
US3660354A
Cited
US3666593A
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US3723363A
Cited
US3736298A
Cited
US3725357A
Cited
US3823119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |