US4026849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite compositions from graft polymerized rigid fillers
Assignee: United States Department of Agriculture
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Filing: 1975-10-03
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Granted: 1977-05-31
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Expires: 1995-10-03
Abstract
Abstract Filled composite plastics are prepared, which consist entirely of a rigid filler which has been graft polymerized with a thermoplastic polymer. The conventional thermoplastic matrix has been eliminated. When the rigid filler is a polysaccharide, such as starch, a product with improved biodegradability is produced. Also, valuable petroleum reserves are conserved, since the polysaccharide portion serves as an extender for the petroleum-based polymer.
Inventors
- 👤 Edward B. Bagley
- 👤 George F. Fanta
- 👤 William M. Doane
- 👤 Lewis A. Gugliemelli
- 👤 Charles R. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/02; C08L101/00; C08L57/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method of preparing a filled plastic article comprising the step of extruding a plastic composite composition consisting essentially of the polymer matrix resulting from grafting onto a rigid filler a thermoplastic polymer having a glass transition temperature of less than about 200° C., wherein said thermoplastic polymer is present in an amount equal to from 20 to 95%, by weight, of the total composition.
Claim 2
Independent Claim
65 words
A method of preparing a filled plastic article comprising the step of extruding a plastic composite composition consisting essentially of the polymer matrix resulting from grafting onto a rigid filler a thermoplastic polymer having a glass transition temperature of less than about 200° C., wherein said thermoplastic polymer is present in an amount equal to from 20 to 95%, by weight, of the total composition.
Claim 3
Dependent Claim
17 words
A method as described in claim 1, wherein the rigid filler is either granular or gelatinized starch.
Claim 4
Dependent Claim
13 words
A method as described in claim 1, wherein the rigid filler is cellulose.
Claim 5
Dependent Claim
38 words
A method as described in claim 1, wherein the rigid filler is granular or gelatinized starch and the thermoplastic polymer is chosen from the group: polystyrene, poly(methyl acrylate), poly(n-butyl acrylate), poly(methyl methacrylate), or a combination of the above.
Claim 6
Dependent Claim
20 words
A method as described in claim 1, wherein the rigid filler is cellulose and the thermoplastic polymer is poly(methyl acrylate).
Claim 7
Dependent Claim
26 words
A method as described in claim 1, wherein the thermoplastic polymer is present in amounts equal to 30 to 60%, by weight, of the total composition.
Claim 8
Dependent Claim
26 words
A method as described in claim 1, wherein the thermoplastic polymer is present in amounts equal to 45 to 55%, by weight, of the total composition.
Claim 9
Dependent Claim
11 words
The filled plastic article produced by the method of claim 1.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |