US5367067A
Expired / Lapsed
US
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Water-resistant starch materials for the production of cast sheets and thermoplastic materials
Assignee: Uhde Inventa Fischer AG
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Filing: 1993-03-01
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Granted: 1994-11-22
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Expires: 2013-03-01
Abstract
Abstract Water-resistant, thermoplastic starch materials which are processable into environmentally safe, thermoplastically produced products and cast sheets. They consist of starch acyl compounds, obtainable from high amylose starches and their derivatives (being sparingly soluble in water), and of plasticizers (like citric acid ethyl ester, glycerol acetate and lactic acid ester), which have a gelatinizing effect, and preferably, a dissolution property resulting in brilliant transparence and, as can be proved, are biodegradable.
Inventors
- 👤 Rainer Frische
- 👤 Renate Gross-Lannert
- 👤 Klaus Wollmann
- 👤 Bernd Best
- 👤 Eduard Schmid
- 👤 Fritz Buehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:47
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; C; C08; C08B; C08B33/00; C08B33/02; C08L; C08L3/00; C08L3/14; C08L3/16; B29K; B29K2003/00; B29K2101/00; B29K2101/12; B29K2995/00; B29K2995/0037; B29K2995/0059
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
A water-resistant, thermoplastic starch material processable into environmentally safe, thermoplastically produced products and cast sheets, comprising (a) at least one acyl modified starch or derivative thereof, said acyl modified starch having a degree of substitution of at least 1.86, is sparingly soluble in water and is prepared from the reaction of (i) high amylose starch having an amylose content of greater than or equal to 70% and (ii) an acylation agent which is a free acid or chloride or anhydride of at least one fatty acid, and (b) at least one biodegradable plasticizer.
Claim 2
Dependent Claim
93 words
A water-resistant, thermoplastic starch material processable into environmentally safe, thermoplastically produced products and cast sheets, comprising (a) at least one acyl modified starch or derivative thereof, said acyl modified starch having a degree of substitution of at least 1.86, is sparingly soluble in water and is prepared from the reaction of (i) high amylose starch having an amylose content of greater than or equal to 70% and (ii) an acylation agent which is a free acid or chloride or anhydride of at least one fatty acid, and (b) at least one biodegradable plasticizer.
Claim 3
Dependent Claim
26 words
The starch material according to claim 1, wherein said acyl modified starch is based on corn starch and has a degree of substitution of about 2.5.
Claim 4
Dependent Claim
27 words
The starch material according to claim 1 wherein said acyl modified starch is based on pea starch and has a degree of substitution of up to 3.0.
Claim 5
Dependent Claim
26 words
The starch material according to claim 1, wherein said acyl modified starch has a degree of substitution of ≧2.0 and said acylation agent is acetic anhydride.
Claim 6
Dependent Claim
17 words
The starch material according to claim 1, wherein said fatty acid has 12 to 22 carbon atoms.
Claim 7
Dependent Claim
23 words
The starch material according to claim 1, wherein said plasticizer is about 0.5 to 50% by weight, based on said acyl modified starch.
Claim 8
Dependent Claim
29 words
The starch material according to claim 6, wherein said plasticizer is selected from the group consisting of ethyl citrate, glycerol acetate, phosphoric acid ester, ethyl lactate and mixtures thereof.
Claim 9
Dependent Claim
25 words
The starch material according to claim 1, wherein said acyl modified starch is based on pea starch and has a substitution degree of about 2.5.
Claim 10
Dependent Claim
31 words
The starch material according to claim 1, wherein said fatty acid is selected from the group consisting of saturated, monounsaturated and polyunsaturated fatty acids having C 6 to C 24 atoms.
Claim 11
Dependent Claim
26 words
The starch material according to claim 1, wherein the portion of said fatty acid amounts up to 35% by weight based on said high amylose starch.
Claim 12
Dependent Claim
28 words
The starch material according to claim 1, wherein said acyl modified starch is based on corn starch and has a degree of substitution of 2.2 to about 2.5.
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |