EP0391853A2
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EP
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Destructurized starch and method of making same
Assignee: Warner Lambert Co LLC
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Filing: 1990-03-29
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Granted: —
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Expires: 2010-03-29
Abstract
Abstract A thermoplastic melt made from starch containing bound phosphate groups and having a water content of 5 to 30% by weight calculated to the starch/water composition characterized in that within said melt the relative concentrations of the cations and the protons bound to said phosphate groups are within the limits eq.M²⁺ : M⁺ : H⁺ = (0.0-1.9) (0.0:0.9) : 0.0-1.4) wherein M²⁺ is a divalent cation, preferably Ca²⁺ or Mg²⁺ or a mixture of these cations; M⁺ is a monovalent cation, preferably Na⁺ or K⁺ or a mixture of these cations; H⁺ is the proton and the sum of the numbers of said equivalents eq.M²⁺, M⁺ and H⁺ per mole of phosphate groups equals 2.
Inventors
- 👤 Jean-Pierre Dr. Sachetto
- 👤 Markus Dr. Egli
- 👤 Robert Frederick Thomas Dr. Stepto
- 👤 Heinz Zeller
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
C; C08; C08B; C08B30/00; C08B30/12; C08L; C08L3/00; C08L3/04; C08L3/06
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
115 words
A thermoplastic melt made from starch containing bound phosphate groups and having a water content of 5 to 30% by weight calculated to the starch/water composition characterized in that within said melt the relative concentrations of the cations and the protons bound to said phosphate groups are within the limits eq.M²⁺ : M⁺ : H⁺¹ = (0.0-1.9) (0.0:0.9) : 0.0-1.4) wherein M²⁺ is a divalent cation, preferably Ca²⁺ or Mg²⁺ or a mixture of these cations; M⁺ is a monovalent cation, preferably Na⁺ or K⁺ or a mixture of these cations; H⁺ is the proton and the sum of the numbers of said equivalents eq.M²⁺, M⁺ and H⁺ per mole of phosphate groups equals 2.
Claim 2
Dependent Claim
115 words
A thermoplastic melt made from starch containing bound phosphate groups and having a water content of 5 to 30% by weight calculated to the starch/water composition characterized in that within said melt the relative concentrations of the cations and the protons bound to said phosphate groups are within the limits eq.M²⁺ : M⁺ : H⁺¹ = (0.0-1.9) (0.0:0.9) : 0.0-1.4) wherein M²⁺ is a divalent cation, preferably Ca²⁺ or Mg²⁺ or a mixture of these cations; M⁺ is a monovalent cation, preferably Na⁺ or K⁺ or a mixture of these cations; H⁺ is the proton and the sum of the numbers of said equivalents eq.M²⁺, M⁺ and H⁺ per mole of phosphate groups equals 2.
Claim 3
Dependent Claim
80 words
A thermoplastic melt according to claim 1, wherein eq.M²⁺ : M⁺ : H⁺ = (0.8 - 1.2) : (0.2 - 0.6) : (0.4 - 0.8); preferably eq.M²⁺ : M⁺ : H⁺ = (0.85 - 1.15) : (0.3 - 0.5) : (0.5 - 0.7); most preferably wherein eq.M²⁺ : M⁺, H⁺ = 1 : 0.4 : 0.6 and wherein each time the sum of the numbers of said equivalents M²⁺ : M⁺ and H⁺ per mole of phosphate groups equals 2.
Claim 4
Dependent Claim
76 words
A thermoplastic melt according to claim 1 or 2, wherein the Thermoplastic Melt Formation Index (TMFI) is within the range of 171 to 202 and preferably within the range of 180 to 190, wherein the TMFI is expressed as being TMFI = a₀ + a₁ + a₂ wherein a₀ = 278.34; a₁ = -45.24 a₂ = -77.60; and wherein the TMFI is preferably TMFI = a₀ + a₁ (1.935 - 0.005) + a₂ (0.01 - 1.26).
Claim 5
Dependent Claim
51 words
A thermoplastic melt according to anyone of the claims 1 to 3, wherein the starch used to produce said melt includes chemically essentially non-modified starch composed mainly of amylose and/or amylopectin and which contain bound phosphate groups, physically modified starch, starch with a modified acid value (pH) preferably such potato starch.
Claim 6
Dependent Claim
51 words
A thermoplastic melt according to anyone of the claims 1 to 4, wherein said starch melt was heated for destructurization in a closed volume for a time long enough to effect destructurization to a temperature within the range of about 105°C to 190°C, preferably within the range of 130°C to 190°C.
Claim 7
Dependent Claim
46 words
A thermoplastic melt according to anyone of the claims 1 to 5, wherein for destructurization pressure was applied in the range of from zero to 150 x 10⁵ N/m², preferably from zero to 75 x 10⁵ N/m² and particularly from zero to 50 x 10⁵ N/m².
Claim 8
Dependent Claim
59 words
A thermoplastic melt according to anyone of the claims 1 to 6, wherein the starch has a water content in the range of about 5 - 25% and preferably of about 10 to 20% by weight of the starch/water component, preferably 12% to 19% and especially 14% to 18% by weight, calculated to the weight of the starch/water component.
Claim 9
Dependent Claim
35 words
A thermoplastic melt according to anyone of the claims 1 to 7, wherein the starch melt contains essentially hydrophilic polymers which are water-soluble or water-swellable, essentially water-insoluble thermoplastic polymers, fillers, lubricants, plasticizers and/or coloring agents.
Claim 10
Dependent Claim
52 words
A thermoplastic melt according to anyone of the claims 1 to 8, characterized in that there is added at least one essentially hydrophilic polymer or a mixture of such polymers within the range of up to 50%, preferably within the range of 3% to 20%, based on the weight of all components.
Claim 11
Dependent Claim
73 words
A thermoplastic melt according to anyone of the claims 1 to 9, characterized in that there is added at least one essentially water-insoluble thermoplastic polymer and that the ratio of the destructurized starch to the essentially water-insoluble thermoplastic polymer is 0.1:99.9 to 99.9:0.1, preferably wherein the destructurized starch is present in an amount of at least 50% and more preferably in the range of 70 to 99% by weight of the entire composition.
Claim 12
Dependent Claim
46 words
A thermoplastic melt according to anyone of the claims 1 to 10, wherein the ratio of the essentially water-insoluble polymer to the starch/water component is 0.5 - 5% to 99.5 - 95% by weight and preferably from 0.5% - 2% to 99.5% - 98% by weight.
Claim 13
Dependent Claim
46 words
A thermoplastic melt according to anyone of the claims 1 to 11, characterized in that there is added at least one organic 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 14
Dependent Claim
35 words
A thermoplastic melt according to anyone of the claims 1 to 12, wherein there is added a plasticizer within the range of about 0.5 to 15%, preferably 0.5 to 5% by weight of all components.
Claim 15
Dependent Claim
35 words
A thermoplastic melt according to anyone of the claims 1 to 13, 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 16
Dependent Claim
41 words
A thermoplastic melt according to anyone of the claims 1 to 14, 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 17
Dependent Claim
29 words
A thermoplastic melt according to anyone of the claims 1 to 15, wherein the blended starch contains at least one active ingredient selected from pharmaceuticals and/or agriculturally active compounds.
Claim 18
Dependent Claim
21 words
The solidified destructurized blended starch obtained by cooling the melt as claimed according to anyone of the claims 1 to 16.
Claim 19
Dependent Claim
32 words
The use of a thermoplastic melt as claimed in anyone of the claims 1 to 17 as carrier material for active ingredients, preferably as carrier materials for pharmaceuticals, and/or agriculturally active substances.
Claim 20
Dependent Claim
179 words
A process for obtaining starch containing phosphate groups and having a relative concentration of the cations and the protons bound to said phosphate groups of eq.M²⁺ : M⁺ : H⁺¹ = (0.0-1.9) (0.0:0.9) : (0.0-1.4) wherein M²⁺ is a divalent cation, preferably Ca²⁺ or Mg²⁺ or a mixture of these cations; M⁺ is a monovalent cation, preferably Na⁺ or K⁺ or a mixture of these cations; H⁺ is the proton and the sum of the numbers of said equivalents eq.M²⁺, M⁺ and H⁺ per mole of phosphate groups equals 2, comprising the steps of A) providing a starch material containing bound phosphate groups B) dispersing said starch in an aqueous solution containing divalent cations M²⁺, monovalent cations M⁺ in a ratio of eq.M²⁺:M⁺ = 1:(2-15), preferably 1:(2-10), and a pH of 4-7.5 for a time long enough to bring the aqueous solution and the contacted starch to equilibrium C) separating the starch from the aqueous medium and D) conditioning the obtained starch material to a water content of 5-30% by weight calculated on the basis of starch and water.
Claim 21
Dependent Claim
179 words
A process for obtaining starch containing phosphate groups and having a relative concentration of the cations and the protons bound to said phosphate groups of eq.M²⁺ : M⁺ : H⁺¹ = (0.0-1.9) (0.0:0.9) : (0.0-1.4) wherein M²⁺ is a divalent cation, preferably Ca²⁺ or Mg²⁺ or a mixture of these cations; M⁺ is a monovalent cation, preferably Na⁺ or K⁺ or a mixture of these cations; H⁺ is the proton and the sum of the numbers of said equivalents eq.M²⁺, M⁺ and H⁺ per mole of phosphate groups equals 2, comprising the steps of A) providing a starch material containing bound phosphate groups B) dispersing said starch in an aqueous solution containing divalent cations M²⁺, monovalent cations M⁺ in a ratio of eq.M²⁺:M⁺ = 1:(2-15), preferably 1:(2-10), and a pH of 4-7.5 for a time long enough to bring the aqueous solution and the contacted starch to equilibrium C) separating the starch from the aqueous medium and D) conditioning the obtained starch material to a water content of 5-30% by weight calculated on the basis of starch and water.
Claim 22
Dependent Claim
11 words
The starch obtained according to the process claimed in claim 19.
Claim 23
Dependent Claim
72 words
A process for obtaining a starch melt as claimed in anyone of the claims 1 to 16, comprising step E): E) heating the starch/water composition according to claim 19 as obtained under step D) optionally after having added further additives at an elevated pressure to a temperature sufficient and for a time long enough to essentially destructurize the starch while maintaining said water content until a melt of destructurized starch is formed.
Claim 24
Dependent Claim
43 words
A process for obtaining a solid article from the melt as claimed in claim 21, comprising the step F): F) cooling said melt (as obtained under step E)) optionally after forming the melt into a shaped article, to form a solid shaped article.
Claim 25
Dependent Claim
9 words
The solid articles as obtained according to claim 22.
Claim 26
Dependent Claim
6 words
A granulate according to claim 23.
Claim 27
Dependent Claim
52 words
The process of shaping a thermoplastic melt as obtained according to anyone of the claims 1 to 16, under controlled water content and pressure conditions 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 28
Dependent Claim
16 words
Shaped articles produced from a composition as claimed in anyone of the claims 1 to 16.
Claim 29
Dependent Claim
28 words
The articles of claim 26, wherein said articles have been shaped as bottles, sheets, films, packaging materials, pipes, rods, laminates, sacks, bags or pharmaceutical capsules, granules or powders.
References Cited (Backward Citations)
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