EP0409789A2
Expired / Lapsed
EP
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Polymer base blend compositions containing destructurized starch
Assignee: Warner Lambert Co LLC
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Filing: 1990-07-16
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Granted: —
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Expires: 2010-07-16
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 styrene sulfonic acid polymers, styrene sulfonic acid copolymers, and salts thereof; said compound 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
- 👤 Jakob Dr. Silbiger
- 👤 David John Dr. Lentz
- 👤 Jean-Pierre Dr. Sachetto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 19:26
CPC Classifications
C; C08; C08L; C08L3/00; C08L3/02; C08L25/00; C08L25/18
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
57 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 styrene sulfonic acid polymers, styrene sulfonic acid copolymers, and salts thereof; said compound being present in an amount effective to enhance the physical properties of said articles.
Claim 2
Dependent Claim
57 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 styrene sulfonic acid polymers, styrene sulfonic acid copolymers, and salts thereof; said compound being present in an amount effective to enhance the physical properties of said articles.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein said component b) has a molecular weight between 2'000 and 1'500'000.
Claim 4
Dependent Claim
28 words
A composition according to claim 1 or claim 2 wherein said component b) is a block copolymer of sulfonated styrene with an unsaturated monomer or a salt thereof.
Claim 5
Dependent Claim
25 words
A composition according to claim 3 wherein said unsaturated monomer is selected from the group consisting of ethylene, butylene, isobutylene, propylene, butadiene, isoprene and styrene.
Claim 6
Dependent Claim
22 words
A composition according to claim 3 wherein said component b) is a copolymer of sulfonated styrene and butadiene or a salt thereof.
Claim 7
Dependent Claim
44 words
A composition according to anyone of the claims 1 to 6 wherein said component b) is a salt with a metal ion or the ammonium ion preferably a salt with sodium, potassium, magnesium or zinc, and most preferably is a sodium or zinc salt.
Claim 8
Dependent Claim
29 words
A composition according to anyone of the claims 1 to 6 wherein the average molecular weight of the compound of component c) is from about 10'000 to about 400'000.
Claim 9
Dependent Claim
43 words
A composition according to anyone of the claims 1 to 7 wherein the compound of component b) has a degree of substitution of between 5 % and 100 %, and preferably wherein the degree of substitution is from 10 % to 50 %.
Claim 10
Dependent Claim
28 words
The composition according to anyone of the claims 1 to 8 wherein the weight % ratio of destructurized starch to component b) is about 1:99 to about 99:1.
Claim 11
Dependent Claim
25 words
The composition according to claim 9 wherein destructurized starch is present in amounts of about 60 % to about 95 % of the total composition.
Claim 12
Dependent Claim
55 words
The composition according to anyone of the claims 1 to 10 wherein the destructurized starch has a water content of about 5 % to about 40 % by weight of the total starch content, and preferably has a water content of about 10 % to about 22 % by weight of the total starch content.
Claim 13
Dependent Claim
38 words
The composition according to anyone of the claims 1 to 11 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 14
Dependent Claim
39 words
The composition according to claim 12 wherein said component c) is selected from the group consisting of polyolefines, vinyl polymers, polystyrenes, polyacrylonitriles, polyacrylates, polymethacrylates, polyacetals, thermoplastic polycondensates, polyarylethers, thermoplastic polyimides, essentially water-insoluble or crystallizable poly(alkylene oxides), and mixtures thereof.
Claim 15
Dependent Claim
29 words
The composition of claim 13 wherein component c) is selected from the group consisting of polyethylenes, polypropylenes, polyisobutylenes, poly(vinyl chlorides), poly(vinyl acetates), polystyrenes; polyamides, polyesters, polyurethanes, polycarbonates, poly(alkylene terephthalates).
Claim 16
Dependent Claim
62 words
The composition according to claim 12 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 of 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 17
Dependent Claim
54 words
The composition according to claim 15 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 18
Dependent Claim
65 words
The composition according to anyone of the claims 12 to 16 wherein the sum of components b) and c) constitute about 1 % to about 99 % by weight of the total composition, preferably constitute about 20 % to about 80 % by weight of the total composition, and most preferably constitutes about 1 % to about 30 % by weight of the total composition.
Claim 19
Dependent Claim
47 words
The composition according to anyone of the claims 1 to 17 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 20
Dependent Claim
17 words
The composition according to anyone of the claims 1 to 18 further containing an agriculturally active compound.
Claim 21
Dependent Claim
16 words
The composition according to anyone of the claims 1 to 19 which is a melt blend.
Claim 22
Dependent Claim
17 words
The composition according to anyone of the claims 1 to 19 which is a cooled solidified blend.
Claim 23
Dependent Claim
12 words
The composition according to claim 21 in particulate, granulated or pelletized form.
Claim 24
Dependent Claim
128 words
A thermoplastic destructurized-starch product made from a composition as claimed in anyone of the claims 1 to 19, 21 and 22, 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 styrene sulfonic acid polymers, styrene sulfonic acid copolymers, and salts thereof (component b)); said compound being present in an amount effective to enhance the physical properties of said articles; 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 25
Dependent Claim
25 words
The product according to claim 23 wherein destructurization of the starch is carried out at a temperature above its melting point and glass transition temperature.
Claim 26
Dependent Claim
34 words
The product according to claim 22 or 23 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 27
Dependent Claim
38 words
The product according to claim 25 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 28
Dependent Claim
35 words
The product according to claim 25 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 29
Dependent Claim
20 words
The product according to anyone of the claims 23 to 27 which is a granulate, a pellet, or a powder.
Claim 30
Dependent Claim
35 words
The product according to claim 28 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 31
Dependent Claim
30 words
The shaped articles according to claim 29 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 32
Dependent Claim
99 words
A thermoplastic destructurized-starch made from a composition as claimed in anyone of the claims 1 to 19, 21 and 22 substantially homogenous melt formed by the process comprising: 1) providing a mixture comprising starch and at least one compound selected from the group consisting of styrene sulfonic acid polymers, styrene sulfonic acid copolymers, and salts thereof; said compound being present in an amount effective to enhance the physical properties of said articles; 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 33
Dependent Claim
33 words
The melt according to claim 31 wherein destructurization of the starch is carried out at a temperature of about 105°C to about 240°C, preferably at a temperature of about 130°C to about 190°C.
Claim 34
Dependent Claim
38 words
The melt according to claim 32 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 35
Dependent Claim
35 words
The melt according to claim 33 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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