Patent EP0376201A1 successfully refreshed from Google Patents.
EP0376201A1
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EP
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Biodegradable shaped products and the method of preparation thereof
Assignee: National Starch and Chemical Investment Holding Corp
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Filing: 1989-12-22
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Granted: —
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Expires: 2009-12-22
Abstract
Abstract A biodegradable shaped product comprising an expanded high amylose starch product having at least 45% by weight amylose content, said expanded product having a low density, closed cell structure with good resilience and compressibility. Another embodiment provides a biodegradable packaging material comprising an expanded, low density, closed cell starch product, the starch having at least 45% by weight amylose content and the expanded product having a bulk density of less than about 32.0 kg/m³ (2.0 lb/ft³), a resiliency of at least about 50%, and a compressibility of from about 100 to 800 g/cm².
Inventors
- 👤 Normal L. Lacourse
- 👤 Paul A. Altieri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:10
CPC Classifications
C; C08; C08B; C08B30/00; C08B30/12; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/125; B; B29; B29C; B29C44/00; B29C44/34; B29C44/3402; B65; B65D; B65D65/00; B65D65/38; B65D65/46; B65D65/466; C08B30/20; C08L; C08L3/00; C08L3/12; C08J2303/00; C08J2303/12; Y; Y02; Y02W; Y02W90/00; Y02W90/10; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
62 words
A biodegradable shaped product comprising an expanded, low density, closed cell, resilient and compressible starch product, said starch having at least 45% by weight amylose content and the expanded product having a bulk density of from about 1.6 to 80 kg/m³ (0.1 to 5 lb/ft³), a resiliency of at least about 20%, and a compressibility of from about 100 to 800 g/cm².
Claim 2
Dependent Claim
62 words
A biodegradable shaped product comprising an expanded, low density, closed cell, resilient and compressible starch product, said starch having at least 45% by weight amylose content and the expanded product having a bulk density of from about 1.6 to 80 kg/m³ (0.1 to 5 lb/ft³), a resiliency of at least about 20%, and a compressibility of from about 100 to 800 g/cm².
Claim 3
Dependent Claim
16 words
The product of claim 1 wherein the starch has at least 65% by weight amylose content.
Claim 4
Dependent Claim
26 words
The product of claim 2 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 5
Dependent Claim
20 words
The product of claim 2 wherein the starch is modified with up to about 10% by weight of propylene oxide.
Claim 6
Dependent Claim
41 words
The product of claim 3 wherein the expanded product has a bulk density of from about 3.2 to 48.0 kg/m³ (0.2 to 3 lb/ft³), a resiliency of at least about 50% and a compressibility of from about 150 to 700 g/cm².
Claim 7
Dependent Claim
20 words
The product of claim 5 wherein the starch is modified with up to about 10% by weight of propylene oxide.
Claim 8
Dependent Claim
20 words
The product of claim 6 wherein up to about 10% by weight of polyvinyl alcohol is added to the starch.
Claim 9
Dependent Claim
19 words
The product of claim 6 wherein an effective amount of a water resistance additive is added to the starch.
Claim 10
Dependent Claim
25 words
The product of claim 1 wherein the starch is a modified starch containing about 2% or more by weight of an inorganic water soluble salt.
Claim 11
Dependent Claim
16 words
The product of claim 9 wherein the salt is an alkali or alkaline earth metal salt.
Claim 12
Dependent Claim
26 words
The product of claim 10 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 13
Dependent Claim
16 words
The product of claim 11 wherein the starch has at least 65% by weight amylose content.
Claim 14
Dependent Claim
30 words
The product of claim 12 wherein the starch is modified with up to about 10% by weight of propylene oxide and contains about 3% or more by weight of salt.
Claim 15
Dependent Claim
11 words
The product of claim 13 wherein the salt is sodium sulfate.
Claim 16
Dependent Claim
17 words
The shaped product of claim 1 which is a packaging product in the form of a sheet.
Claim 17
Dependent Claim
17 words
The shaped product of claim 12 which is a packaging product in the form of a sheet.
Claim 18
Dependent Claim
59 words
A biodegradable packaging material comprising an expanded, low density, closed cell, resilient and compressible starch product, said starch having at least 45% by weight amylose content and the expanded product having a bulk density of less than about 32.0 kg/m³ (2.0 lb/ft³), a resiliency of at least about 50%, and a compressibility of from about 100 to 800 g/cm².
Claim 19
Dependent Claim
59 words
A biodegradable packaging material comprising an expanded, low density, closed cell, resilient and compressible starch product, said starch having at least 45% by weight amylose content and the expanded product having a bulk density of less than about 32.0 kg/m³ (2.0 lb/ft³), a resiliency of at least about 50%, and a compressibility of from about 100 to 800 g/cm².
Claim 20
Dependent Claim
17 words
The packaging material of claim 17 wherein the starch has at least 65% by weight amylose content.
Claim 21
Dependent Claim
27 words
The packaging material of claim 18 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 22
Dependent Claim
41 words
The packaging material of claim 17 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms and contains about 2% or more by weight of an inorganic water soluble salt.
Claim 23
Dependent Claim
16 words
The packaging material of claim 20 wherein the salt is alkali or alkaline earth metal salt.
Claim 24
Dependent Claim
23 words
The packaging material of claim 21 wherein the starch has at least 65% by weight amylose content and the salt is sodium sulfate.
Claim 25
Dependent Claim
21 words
The packaging material of claim 18 wherein the starch is modified with up to about 10% by weight of propylene oxide.
Claim 26
Dependent Claim
39 words
The packaging material of claim 23 wherein the expanded product has a bulk density of less than about 16.0 kg/m³ (1.0 lb/ft³), a resilience of at least about 60% and a compressibility of from about 150 to 700 g/cm².
Claim 27
Dependent Claim
21 words
The packaging material of claim 24 wherein up to about 10% by weight of polyvinyl alcohol is added to the starch.
Claim 28
Dependent Claim
20 words
The packaging material of claim 25 wherein the expanded product has a bulk density of less than about 0.6 lb/ft³.
Claim 29
Dependent Claim
42 words
The shaped product of claim 1 prepared by extruding the starch in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150 to 250 o C followed by a thermoforming operation.
Claim 30
Dependent Claim
34 words
The product of claim 27 wherein the starch has at least 65% by weight amylose and is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 31
Dependent Claim
26 words
The product of claim 28 which is thermoformed into a packaging product selected from the group consisting of a container, carton, sheet, tray, dish or cup.
Claim 32
Dependent Claim
55 words
The shaped product of claim 1 prepared by extruding the starch which is a modified starch containing about 2% or more by weight of an inorganic water soluble salt in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150 to 250 o C.
Claim 33
Dependent Claim
35 words
The product of claim 30 wherein the starch has at least 65% by weight amylose content and is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 34
Dependent Claim
40 words
The product of claim 31 wherein the starch is modified with up to about 10% by weight of propylene oxide and contains about 3% or more by weight of salt, the salt being an alkali or alkaline earth metal salt.
Claim 35
Dependent Claim
28 words
The product of claim 31 wherein extruded product is themoformed into a packaging product selected from the group consisting of a container, carton, sheet, tray, dish or cup.
Claim 36
Independent Claim
47 words
A method of preparing an expanded, biodegradable, low-density packaging material comprising extruding starch containing at least 45% by weight amylose content in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150 to 250 o C.
Claim 37
Independent Claim
47 words
A method of preparing an expanded, biodegradable, low-density packaging material comprising extruding starch containing at least 45% by weight amylose content in the presence of a total moisture content of 21% or less by weight and at a temperature of from about 150 to 250 o C.
Claim 38
Dependent Claim
16 words
The method of claim 34 wherein said starch contains at least 65% by weight of amylose.
Claim 39
Dependent Claim
26 words
The method of claim 35 wherein the starch is modified with up to about 15% by weight of alkylene oxide containing 2 to 6 carbon atoms.
Claim 40
Dependent Claim
22 words
The method of claim 36 wherein the modified starch contains about 2% or more by weight of an inorganic water soluble salt.
Claim 41
Dependent Claim
29 words
The method of claim 37 wherein the total moisture content is from about 13 to 19% by weight and the temperature is from about 160 to 210 o C.
Claim 42
Dependent Claim
36 words
The method of claim 38 wherein the starch is modified with up to about 10% by weight of propylene oxide and up to about 10% by weight of p olyvinyl alcohol is added to the starch.
Claim 43
Dependent Claim
37 words
The method of claim 39 wherein said extruder is a twin-screw extruder and the temperature is maintained in at least the section of the extruder closest to the die and just before the material leaves the extruder.
References Cited (Backward Citations)
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