US5055247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing woody moldings
Assignee: Okura Industrial Co Ltd
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Filing: 1987-03-05
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Granted: 1991-10-08
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Expires: 2007-03-05
Abstract
Abstract An industrially advantageous woody molding is produced by adding a dibasic acid anhydride to a woody material such as a wood meal in the presence or absence of a catalyst such as sodium carbonate, whereby the dibasic acid anhydride is bonded to the hydroxy group of the woody material to form an esterified woody material, adding thereto a compound having at least two epoxy groups in the molecule thereof, kneading well the mixture, and then heat and press molding the kneaded mixture at a temperature higher than 120 DEG C. and a pressure greater than 60 kg/cm2. The product thus obtained by the process of this invention has a smooth and lustrous surface, has good water resistance and dimensional stability, and also is excellent in mechanical strength and hardness.
Inventors
- 👤 Minoru Ueda
- 👤 Hideaki Matsuda
- 👤 Masanori Hara
- 👤 Koichi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
C; C08; C08H; C08H8/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
138 words
A two-step process for producing a hard woody molding, which comprises as step one, adding a dibasic acid anhydride to hydroxy groups of a woody material selected from the group consisting of wood chip, wood metal and the digested product thereof to form a half ester of the woody material, said half ester containing carboxyl groups, and, as step two, adding a compound having at least two epoxy groups in the molecule thereof to the half ester of the woody material obtained from step one, and after sufficiently kneading the mixture, heating and press molding the kneaded mixture at a temperature higher than 120° C. and a pressure greater than 60 kg/cm 2 , whereby said woody molding is cross-linked by reaction between the epoxy groups of said epoxy compound and the carboxy groups of said half ester.
Claim 2
Dependent Claim
138 words
A two-step process for producing a hard woody molding, which comprises as step one, adding a dibasic acid anhydride to hydroxy groups of a woody material selected from the group consisting of wood chip, wood metal and the digested product thereof to form a half ester of the woody material, said half ester containing carboxyl groups, and, as step two, adding a compound having at least two epoxy groups in the molecule thereof to the half ester of the woody material obtained from step one, and after sufficiently kneading the mixture, heating and press molding the kneaded mixture at a temperature higher than 120° C. and a pressure greater than 60 kg/cm 2 , whereby said woody molding is cross-linked by reaction between the epoxy groups of said epoxy compound and the carboxy groups of said half ester.
Claim 3
Dependent Claim
19 words
The process as claimed in claim 1 wherein the water content of the woody material is lower than 5%.
Claim 4
Dependent Claim
26 words
The process as claimed in claim 1 wherein the feed amount of the dibasic acid anhydride to the woody material is 5 to 80% by weight.
Claim 5
Dependent Claim
33 words
The process as claimed in claim 1 wherein the esterification reaction of the hydroxy group of the woody material and the dibasic acid anhydride is performed at a temperature higher than 60° C.
Claim 6
Dependent Claim
29 words
The process as claimed in claim 1 wherein the dibasic acid anhydride added to the hydroxy group of the woody material is maleic anhydride, succinic anhydride, or phthalic anhydride.
Claim 7
Dependent Claim
32 words
The process as claimed in claim 1 wherein in the esterification reaction of the hydroxy group of the woody material and the dibasic acid anhydride, sodium carbonate is used as a catalyst.
Claim 8
Dependent Claim
28 words
The process as claimed in claim 1 wherein the molecular weight of the compound having at least two epoxy groups in the molecule thereof is 200 to 2,000.
Claim 9
Dependent Claim
15 words
The process as claimed in claim 7 wherein the compound is in a liquid state.
Claim 10
Dependent Claim
28 words
The process as claimed in claim 1 wherein the compound having at least two epoxy groups in the molecule thereof is bisphenol diglycidyl ether or glycerol diglycidyl ether.
Claim 11
Dependent Claim
28 words
The process as claimed in claim 2, wherein the compound having at least two epoxy groups in the molecule thereof is bisphenol diglycidyl ether or glycerol diglycidyl ether.
Claim 12
Dependent Claim
28 words
The process as claimed in claim 7, wherein the compound having at least two epoxy groups in the molecule thereof if bisphenol diglycidyl ether or glycerol diglycidyl ether.
Claim 13
Dependent Claim
28 words
The process as claimed in claim 8, wherein the compound having at least two epoxy groups in the molecule thereof is bisphenol diglycidyl ether or glycerol diglycidyl ether.
References Cited (Backward Citations)
US3645939A
Cited
US4285843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |