US3958069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose-polymer composites
Assignee: Champion International Corp
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Filing: 1973-03-22
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Granted: 1976-05-18
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Expires: 1993-03-22
Abstract
Abstract There is disclosed the preparation of polymer composites with porous cellulosic materials, such as wood. The process for forming such a composite involves impregnating the wood with a polymerizable complex of a monomer combination such as a complex of maleic anhydride and styrene. The polymerization is uncatalyzed -- i.e., it is conducted without employing conventional means for inducing polymerization of monomers in wood, such as high-energy radiation or the thermal decomposition of a chemical free radical precursor. There is also disclosed a solid, stable complex of styrene and maleic anhydride.This is a division of application Ser. No. 32,736 filed Apr. 28, 1970 and now U.S. Pat. No. 3,765,934.
Inventors
- 👤 Norman G. Gaylord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/02; B27K3/15; B27K3/156; C; C08; C08L; C08L97/00; C08L97/02; C08L35/00; C08L35/06; Y; Y10; Y10S; Y10S264/00; Y10S264/07; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31971; Y10T428/31989
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
68 words
A process for the preparation of a molded object which comprises impregnating particles of a porous, cellulosic material with a polymerizable equimolar complex of styrene and maleic anhydride, molding said impregnated particles into an object and thereafter subjecting said complex in situ to non-catalytic polymerization, the anhydride groups in the resultant polymer reacting with cellulosic hydroxyl groups whereby bonds are formed between the polymer and said cellulosic material.
Claim 2
Dependent Claim
68 words
A process for the preparation of a molded object which comprises impregnating particles of a porous, cellulosic material with a polymerizable equimolar complex of styrene and maleic anhydride, molding said impregnated particles into an object and thereafter subjecting said complex in situ to non-catalytic polymerization, the anhydride groups in the resultant polymer reacting with cellulosic hydroxyl groups whereby bonds are formed between the polymer and said cellulosic material.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said porous, cellulosic material is wood.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein up to 20 mole percent of the styrene is replaced with divinylbenzene.
Claim 5
Dependent Claim
20 words
The process of claim 2 wherein up to 10 mole percent of said maleic anhydride is replaced with di-n-butyl maleate.
Claim 6
Dependent Claim
23 words
The process of claim 2 wherein up to 20 mole percent of said styrene is replaced with vinyl isobutyl ether or vinyl acetate.
Claim 7
Dependent Claim
18 words
The process of claim 2 wherein said complex is used in conjunction with an excess amount of styrene.
Claim 8
Dependent Claim
12 words
The process of claim 2 wherein said complex contains a polymerization inhibitor.
Claim 9
Dependent Claim
25 words
The process of claim 2 wherein said polymerization is conducted by exposing said impregnated wood particles to a temperature of from about 70° to 125°C.
Claim 10
Dependent Claim
25 words
The process of claim 2 wherein said polymerization is conducted at more than one temperature, the first temperature being substantially lower than the final temperature.
Claim 11
Dependent Claim
21 words
The process of claim 2 wherein said complex contains dissolved therein a low molecular weight copolymer of styrene and maleic anhydride.
Claim 12
Dependent Claim
21 words
The process of claim 2 wherein said polymerizable complex of styrene and maleic anhydride has a melting point of about 35°C.
Claim 13
Dependent Claim
10 words
A molded object obtained by the process of claim 1.
Claim 14
Dependent Claim
10 words
A molded object obtained by the process of claim 2.
References Cited (Backward Citations)
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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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |