US4431788A
Expired / Lapsed
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Process for producing starch/polyolefin polymer compositions
Assignee: Unilever Bestfoods North America
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Filing: 1982-11-12
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Granted: 1984-02-14
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Expires: 2002-11-12
Abstract
Abstract A process is disclosed for producing starch/polyolefin polymer compositions by polymerization of at least one olefin in the presence of a Ziegler-Natta catalyst. The Ziegler-Natta catalyst used is obtained by contacting dried starch with an aluminum trialkyl followed by introducing a transition metal compound of the formula (cyclopentadienyl).sub.n MR.sub.m wherein M is selected from the group consisting of Cr, Ti, V or Zr, R is a lower hydrocarbon radical or acetyl acetonate, and n and m are integers from 0 to 4 and n+m equals 2 to 4.
Inventors
- 👤 Walter Kaminsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/50; D06M13/51; C; C08; C08F; C08F251/00; C08F289/00; D06M11/00; D06M11/07; D06M11/11; D06M11/20; D06M11/22; D06M11/24
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
152 words
A process for producing starch/polyolefin polymer compositions by polymerization of at least one olefin in an inert, liquid or gaseous reaction medium at a temperature from -50° C. to 145° C. in the presence of a halogen-free Ziegler-Natta catalyst by (a) contacting starch first with an aluminum trialkyl compound; and then with a halogen-free transition metal compound of the general formula (cyclopentadienyl) n MR m wherein M is a metal selected from the group consisting of Cr, Ti, V or Zr; R is a lower hydrocarbon radical having from 1 to 6 carbon atoms or acetyl acetonate; and n and m are integers from 0 to 4 and the sum of n+m is sufficient to saturate M, wherein the molar ratio of said aluminum trialkyl compound to said halogen-free transition metal compound is from 2:1 to 1000:1; followed by (b) contacting said at least one olefin with the mixture of step (a).
Claim 2
Dependent Claim
152 words
A process for producing starch/polyolefin polymer compositions by polymerization of at least one olefin in an inert, liquid or gaseous reaction medium at a temperature from -50° C. to 145° C. in the presence of a halogen-free Ziegler-Natta catalyst by (a) contacting starch first with an aluminum trialkyl compound; and then with a halogen-free transition metal compound of the general formula (cyclopentadienyl) n MR m wherein M is a metal selected from the group consisting of Cr, Ti, V or Zr; R is a lower hydrocarbon radical having from 1 to 6 carbon atoms or acetyl acetonate; and n and m are integers from 0 to 4 and the sum of n+m is sufficient to saturate M, wherein the molar ratio of said aluminum trialkyl compound to said halogen-free transition metal compound is from 2:1 to 1000:1; followed by (b) contacting said at least one olefin with the mixture of step (a).
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein said halogen-free Ziegler-Natta catalyst has a molar ratio of aluminum trialkyl compound to halogen-free transition metal compound of from 10:1 to 100:1.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein said halogen-free catalyst has a ratio of aluminum trialkyl to starch in mmol/g of no more than 5.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the transition metal compound has the formula (cyclopentadienyl).sub.2 M(CH.sub.3).sub.2 wherein M is selected from the group consisting of Cr, Ti, V or Zr.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein ethylene, propene, or ethylene and propene are used as the lower aliphatic alpha-monoolefin.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein starch selected from the group consisting of granular cereal starch, root starch, tuber starch or a modified starch is used as the starch.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein a mixture of granular starch and up to 99% by weight cellulose fibers is used as the starch.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein a mixture of granular starch and lignin is used as the starch.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein a mixture of granular starch, cellulose fibers and lignin is used as the starch.
Claim 11
Dependent Claim
34 words
The process of claim 1 wherein the product of polymerization is homogenized after separation of liquid reaction medium at a temperature from 30° to 145° C., under the action of kneading or shearing forces.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein the starch is separated from the starch, polyolefin polymer compositions mechanically.
Claim 13
Dependent Claim
17 words
The process of claim 1 wherein the starch is separated from the starch/polyolefin polymer compositions by dissolving.
Claim 14
Dependent Claim
13 words
The process of claim 1 wherein the olefin is a lower aliphatic alpha-monoolefin.
Claim 15
Dependent Claim
13 words
The process of claim 2 wherein the olefin is a lower aliphatic alpha-monolefin.
Claim 16
Dependent Claim
19 words
The process of claim 14 wherein ethylene, propene, or ethylene and propene are used as the lower aliphatic alpha-monoolefin.
Claim 17
Dependent Claim
24 words
The process of claim 2, wherein saaid halogen-free catalyst has a ratio of aluminum trialkyl to starch in mmol/g of no more than 5.
Claim 18
Dependent Claim
29 words
The process of claim 2 wherein the transition metal compound has the formula (cyclopentadienyl).sub.2 M(CH.sub.3).sub.2 wherein M is selected from the group consisting of Cr, Ti, V or Zr.
Claim 19
Dependent Claim
29 words
The process of claim 2 wherein starch selected from the group consisting of granular cereal starch, root starch, tuber starch or a modified starch is used as the starch.
Claim 20
Dependent Claim
24 words
The process of claim 2 wherein a mixture of granular starch and up to 99% by weight cellulose fibers is used as the starch.
Claim 21
Dependent Claim
18 words
The process of claim 2 wherein a mixture of granular starch and lignin is used as the starch.
Claim 22
Dependent Claim
20 words
The process of claim 2 wherein a mixture of granular starch, cellulose fibers and lignin is used as the starch.
Claim 23
Dependent Claim
34 words
The process of claim 2 wherein the product of polymerization is homogenized after separation of liquid reaction medium at a temperature from 30° to 145° C., under the action of kneading or shearing forces.
Claim 24
Dependent Claim
16 words
The process of claim 2 wherein the starch is separated from the starch/polyolefin polymer compositions mechanically.
Claim 25
Dependent Claim
17 words
The process of claim 2 wherein the starch is separated from the starch/polyolefin polymer compositions by dissolving.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |