EP0408502A2
Expired / Lapsed
EP
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Polymer base blend compositions containing destructurized starch
Assignee: Warner Lambert Co LLC
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Filing: 1990-07-05
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Granted: —
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Expires: 2010-07-05
Abstract
Abstract A composition of matter capable of being formed into articles having substantial dimensional stability comprising a) destructurized starch, and b) at least one compound selected from the group consisting of anionically modified polysaccharides; said modified polysaccharide being present in an amount effective to enhance the physical properties of said articles. The composition may contain further conventional additives as well as hydrophobic, substantially water-insoluble polymers.
Inventors
- 👤 Jean-Pierre Dr. Sachetto
- 👤 Jakob Dr. Silbiger
- 👤 David John Dr. Lentz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:10
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
50 words
A composition of matter capable of being formed into articles having substantial dimensional stability comprising a) destructurized starch, and b) at least one compound selected from the group consisting of anionically modified polysaccharides; said modified polysaccharide being present in an amount effective to enhance the physical properties of said articles.
Claim 2
Dependent Claim
50 words
A composition of matter capable of being formed into articles having substantial dimensional stability comprising a) destructurized starch, and b) at least one compound selected from the group consisting of anionically modified polysaccharides; said modified polysaccharide being present in an amount effective to enhance the physical properties of said articles.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein said anionically modified polysaccharide is selected from the group consisting of starches, celluloses, hemicelluloses, xylanes, gums, alginates, pectins and pullulans.
Claim 4
Dependent Claim
17 words
A composition according to claim 2 wherein said anionically modified polysaccharide is selected from starch and/or cellulose.
Claim 5
Dependent Claim
35 words
A composition according to anyone of the claims 1 to 3 wherein said anionically modified polysaccharides are substituted by phosphate groups, sulfate groups or carboxyl groups in the form of free acids or salts thereof.
Claim 6
Dependent Claim
14 words
A composition according to claim 4 wherein the anionically modified polysaccharide carries sulfate groups.
Claim 7
Dependent Claim
27 words
A composition according to claim 4 wherein the anionically modified polysaccharide carries sulfate groups in the form of an ammonium or alkali salt or organic base salt.
Claim 8
Dependent Claim
14 words
A composition according to claim 4 wherein the anionically modified polysaccharide carries carboxyl groups.
Claim 9
Dependent Claim
26 words
A composition according to claim 4 wherein the anionically modified polysaccharide carries carboxyl groups in the form of ammonium or alkali salts or organic base salt.
Claim 10
Dependent Claim
24 words
A composition according to anyone of the claims 1 to 8 wherein the anionically modified polysaccharide is co-substituted by hydroxyalkyl and/or by alkylether groups.
Claim 11
Dependent Claim
44 words
A composition according to anyone of the claims 1 to 9 wherein the degree of substitution of the anionically modified polysaccharide is from about 0.01 to about 2.9, preferably from about 0.01 to about 2.5 and most preferably from about 0.05 to about 1.5.
Claim 12
Dependent Claim
28 words
The composition according to anyone of the claims 1 to 10 wherein the weight % ratio of destructurized starch to component b) is about 1:99 to about 99:1.
Claim 13
Dependent Claim
25 words
The composition according to claim 11 wherein destructurized starch is present in amounts of about 50 % to about 99 % of the total composition.
Claim 14
Dependent Claim
51 words
The composition according to anyone of the claims 1 to 12 wherein the destructurized starch has a water content of about 5 % to about 40 % by weight of the total starch content, and preferably of about 10 % to about 22 % by weight of the total starch content.
Claim 15
Dependent Claim
38 words
The composition according to anyone of the claims 1 to 13 wherein there is additionally incorporated component c) comprising an substantially water-insoluble thermoplastic polymer which does not fall within the definition of those compounds defined as component b).
Claim 16
Dependent Claim
41 words
The composition according to claim 14 wherein said component c) is selected from the group consisting of polyolefines, vinyl polymers, polystyrenes, polyacrylonitriles, poly(vinyl carbazols), polyacrylates, polymethacrylates, polyacetals, thermoplastic polycondensates, polyarylethers, thermoplastic polyimides, essentially water-insoluble or crystallizable poly(alkylene oxides), and mixtures thereof.
Claim 17
Dependent Claim
29 words
The composition of claim 15 wherein component c) is selected from the group consisting of polyethylenes, polypropylenes, polyisobutylenes, poly(vinyl chlorides), polyvinyl acetates), polystyrenes; polyamides, polyesters, polyurethanes, polycarbonates, poly(alkylene terephthalates).
Claim 18
Dependent Claim
62 words
The composition according to claim 14 wherein component c) is selected from the group consisting of alkylene/vinyl ester-copolymers, alkylene/acrylate or methacrylate copolymers, ABS copolymers, styrene/acrylonitrile copolymers, alkylene/maleic anhydride copolymers, partially hydrolyzed polyacrylates or polymethacrylates, partially hydrolyzed copolymers or acrylates and methacrylates, acrylic acid esters/acrylonitrile copolymers and hydrolysates thereof, acrylamide/acrylonitrile copolymers, block copolymers of amide-ethers, amide-esters; block copolymers of urethane-esters and mixtures thereof.
Claim 19
Dependent Claim
54 words
The composition according to claim 17 wherein component c) is selected from the group consisting of ethylene/vinyl acetate copolymers (EVA), ethylene/vinyl alcohol copolymers (EVAL), ethylene/acrylic acid copolymers (EAA), ethylene/ethyl acrylate copolymers (EEA), ethylene/methacrylate copolymers (EMA), styrene/acrylonitrile copolymers (SAN), ethylene/maleic anhydride copolymers, block copolymers of amide-ethers, amide-esters; block copolymers of urethane-ethers, urethane-esters and mixtures thereof.
Claim 20
Dependent Claim
28 words
The composition according to claim 14 wherein the sum of components b) and c) constitute about 1 % to about 99 % by weight of the total composition.
Claim 21
Dependent Claim
43 words
The composition according to claim 19 wherein the sum of components b) and c) consitute about 20 % to about 80 % by weight of the total composition, and preferably about 1 % to about 30 % by weight of the total composition.
Claim 22
Dependent Claim
47 words
The composition according to anyone of the claims 1 to 20 wherein there are additionally incorporated one or more materials selected from the group consisting of adjuvants, fillers, lubricants, mold release agents, plasticizers, foaming agents, stabilizers, extenders, chemical modifiers, flow accelerators, coloring agents, pigments and mixtures thereof.
Claim 23
Dependent Claim
17 words
The composition according to anyone of the claims 1 to 21 further containing an agriculturally active compound.
Claim 24
Dependent Claim
16 words
The composition according to anyone of the claims 1 to 22 which is a melt blend.
Claim 25
Dependent Claim
17 words
The composition according to anyone of the claims 1 to 22 which is a cooled solidified blend.
Claim 26
Dependent Claim
12 words
The composition according to claim 24 in particulate, granulated or pelletized form.
Claim 27
Dependent Claim
101 words
A thermoplastic destructurized-starch product made from a composition according to anyone of the claims 1 to 22, 24 and 25 having substantial dimensional stability formed by the process comprising: 1) providing a mixture comprising starch and at least one compound selected from the group consisting of anionically modified polysaccharides, 2) heating said mixture in a closed volume under sufficient temperature and pressure for a time long enough to effectuate destructurization of said starch and form a substantially homogenous melt; 3) shaping said melt into an article; and 4) allowing said shaped article to cool to a substantially dimensionally stable thermoplastic product.
Claim 28
Dependent Claim
25 words
The product according to claim 26 wherein destructurization of the starch is carried out at a temperature above its melting point and glass transition temperature.
Claim 29
Dependent Claim
34 words
The product according to claim 26 or 27 wherein the destructurization of the starch is carried out at temperatures of about 105°C to about 240°C, preferably at temperatures of about 130°C to about 190°C.
Claim 30
Dependent Claim
38 words
The product according to claim 27 wherein the melt is formed under the range of pressure from the minimum pressure necessary to avoid formation of water vapour under the applied temperature up to about 150 x 10⁵ N/m²
Claim 31
Dependent Claim
35 words
The product according to claim 29 wherein the heat and pressure are maintained until the starch has undergone the specific narrow endothermic transition just prior to its endothermic change characteristic of oxidative and thermal degradation.
Claim 32
Dependent Claim
20 words
The product according to anyone of the claims 26 to 30 which is a granulate, a pellet or a powder.
Claim 33
Dependent Claim
35 words
The product according to claim 31 further melted and processed to form a shaped article selected from the group consisting of containers, bottles, pipes, rods, packaging material, sheets, foams, films, sacks, bags and pharmaceutical capsules.
Claim 34
Dependent Claim
30 words
The shaped articles according to claim 32 wherein the further melting and processing comprises foaming, filming, compression molding, injection molding, blow molding, extruding, co-extruding, vacuum forming, thermoforming and combinations thereof.
Claim 35
Dependent Claim
76 words
A thermoplastic destructurized-starch substantially homogenous melt made from a composition according to anyone of the claims 1 to 22, 24 and 25 formed by the process comprising: 1) providing a mixture comprising starch and at least one compound selected from the group consisting of anionically modified polysaccharides (component b); and 2) heating said mixture in a closed volume under sufficient temperature and pressure for a time long enough to destructurize said starch and form said melt.
Claim 36
Dependent Claim
34 words
The melt according to claim 34 wherein destructurization of the starch is carried out at a temperature of about 105°C to about 240°C, and preferably at a temperature of about 130°C to about 190°C.
Claim 37
Dependent Claim
38 words
The melt according to claim 35 wherein the melt is formed under the range of pressure from the minimum pressure necessary to avoid formation of water vapour under the applied temperature up to about 150 x 10⁵ N/m²
Claim 38
Dependent Claim
35 words
The melt according to claim 35 wherein the heat and pressure are maintained until the starch has undergone the specific narrow endothermic transition just prior to its endothermic change characteristic of oxidative and thermal degradation.
References Cited (Backward Citations)
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