Patent EP0282451A2 successfully refreshed from Google Patents.
EP0282451A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for making destructurized starch
Assignee: Warner Lambert Co LLC
•
Filing: 1988-03-02
•
Granted: —
•
Expires: 2008-03-02
Abstract
Abstract A destructurized native starch material is described which has a water content in the range of about 10 to 25 % by weight and that its mass average molar mass is reduced by a factor of 2 to 5000 compared to its original mass average molar mass. The destructurized starch is produced by heating a chemically non-modified starch material having a water content in the range of about 5 to 25 % by weight of the total weight of the composition in the presence of a chain scission catalyst in a closed volume to an elevated temperature sufficient to form a thermoplastic melt and until the mass average molar mass is reduced by a factor of 2 to 5000.
Inventors
- 👤 Robert Frederick Thomas Dr. Stepto
- 👤 Ivan Dr. Tomka
- 👤 Beat Dobler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:43
CPC Classifications
C; C08; C08B; C08B31/00; C08L; C08L3/00; C08L3/02; C08B30/00; C08B30/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
87 words
A method for producing destructurized starch, comprising heating a chemically non-modified starch material having a water content in the range of about 10 to 25 % by weight of the total weight of the composition, in the presence of a chain scission catalyst in a closed volume to an elevated temperature sufficient to form a thermoplastic melt and continuing heating until the mass average molar mass of said starch material is reduced by a factor of 2 to 5000, compared with its original mass average molar mass.
Claim 2
Independent Claim
87 words
A method for producing destructurized starch, comprising heating a chemically non-modified starch material having a water content in the range of about 10 to 25 % by weight of the total weight of the composition, in the presence of a chain scission catalyst in a closed volume to an elevated temperature sufficient to form a thermoplastic melt and continuing heating until the mass average molar mass of said starch material is reduced by a factor of 2 to 5000, compared with its original mass average molar mass.
Claim 3
Dependent Claim
40 words
A method according to claim 1, wherein said chemically non-modified starch is at least one member of a class selected from native starch, gelatinized or cooked starch or generally carbohydrates of natural, vegetable origin, composed mainly of amylose and/or amylopectin.
Claim 4
Independent Claim
62 words
A method according to the claims 1 or 2, wherein the starch material has a water content in the range of about 10 to 25 % and better 10 to 20 % calculated to the weight of the starch composition preferably a water content of 12 to 19 % and especially 14 to 18 % calculated to the weight of starch composition.
Claim 5
Independent Claim
44 words
A method according to anyone of the claims 1 to 3, wherein the starch material is heated to an elevated temperature, preferably in the range of 100 to 200°C, preferably 140 to 190°C, and especially to temperatures within the range of 160 to 185°C.
Claim 6
Independent Claim
44 words
A method according to anyone of the claims 1 to 4, wherein pressure is applied in the range of from zero to 150 × 10⁵ N/m² preferably from zero to 75 × 10⁵ N/m² and most particularly from zero to 50 × 10⁵ N/m².
Claim 7
Independent Claim
47 words
A method according to any one of the claims 1 to 5, wherein a chain scission catalyst is added which acts by splitting the - 1,4 glycosidic bonds in the starch macromolecule in a statistical or regular manner, preferably an acid or a base, including Lewis acids.
Claim 8
Dependent Claim
27 words
A method according to claim 6, wherein the chain scission catalyst contains an inorganic acid, a Lewis acid, an organic acid or a mixture of such compounds.
Claim 9
Dependent Claim
27 words
A method according to claim 6, wherein the chain scission catalyst contains an inorganic base, an organic base, a Lewis base or a mixture of such compounds.
Claim 10
Dependent Claim
27 words
A method according to claim 6, wherein said chain scission catalyst is selected from hydrochloric acid, sulfuric acid, EDTA, citric acids or a mixture of these compounds.
Claim 11
Dependent Claim
42 words
A method according to claim 6, wherein said chain scission catalyst is added in a concentration in the range of 10⁻⁶ to 10⁻² mole of catalyst per mole of anhydro-glucose unit (AGU), preferably between 0.1 × 10⁻³ to 5 × 10⁻³ mole/AGU.
Claim 12
Dependent Claim
50 words
A starch material according to anyone of the claims 1 to 10, characterized in that the reduction of the mass average molar mass of the starch used is by the factor 2 to 5000, preferably by a factor 4 to 1000 and most preferably by a factor 5 to 300.
Claim 13
Independent Claim
34 words
A method according to anyone of the claims 1 to 12, characterized in that one or more additive(s) is/are added before, during or after heating of the starch material to form a thermoplastic melt.
Claim 14
Dependent Claim
46 words
A method according to claim 12, characterized in that there is added at least one extender or a mixture of extenders within the range of up to 50 %, preferably within the range of 3 % to 10 %, based on the weight of all components.
Claim 15
Independent Claim
45 words
A method according to the claims 12 or 13, characterized in that there is added at least one inorganic filler or a mixture of such fillers in a concentration of about 0.02 to 3 %, preferably 0.02 to 1 %, by weight of all components.
Claim 16
Independent Claim
33 words
A method according to anyone of the claims 12 to 14, wherein a plasticizer within the range of about 0.5 to 15 %, preferably 0.5 to 5 % by weight of all components.
Claim 17
Independent Claim
36 words
A method according to anyone of the claims 12 to 15, wherein a coloring agent is added in a concentration of about 0.001 to 10 %, preferably 0.5 to 3 % by weight of all components.
Claim 18
Independent Claim
42 words
A method according to anyone of the claims 12 to 16, wherein a plasticizer is added and the sum of the plasticizer and water contents does not exceed 25 %, and preferably does not exceed 20 %, by weight of all components.
Claim 19
Independent Claim
52 words
A method according to anyone of the claims 12 to 17, wherein a lubricant is added to improve the flow-properties optionally together with a monoand/or diglyceride and/or a phosphatide in an amount of up to 5 %, preferably within the range of 0.5 to 2 % by weight of the total composition.
Claim 20
Independent Claim
39 words
A method according to anyone of the claims 12 to 18, wherein there has been added silicon dioxide or titanium dioxide has been added in a concentration of about 0.02 to 1 % by weight of the total composition.
Claim 21
Dependent Claim
13 words
A destructurized starch obtained according to anyone of the claims 1 to 19.
Claim 22
Dependent Claim
53 words
The process of shaping destructurized starch according to anyone of the claims 1 to 19, under controlled water content and pressure conditions as a thermoplastic melt wherein said shaping process is at least one member selected from the class consisting of injection molding, blow molding, extrusion and coextrusion, compression molding or vacuum forming.
Claim 23
Dependent Claim
20 words
Shaped articles produced from a composition obtained by the method as claimed in anyone of the claims 1 to 19.
Claim 24
Dependent Claim
25 words
The articles of claim 21, wherein said articles have been shaped as bottles, sheets, films, packaging materials, pipes, rods, laminates, sacks, bags or pharmaceutical capsules.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.