US6071998A
Expired / Lapsed
US
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Polyhydroxyalkanoate molding compositions
Assignee: CJ CheilJedang Corp
•
Filing: 1998-07-22
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Granted: 2000-06-06
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Expires: 2018-07-22
Abstract
Abstract Molding compositions including polyhydroxyalkanoates are provided. The use of polyhydroxyalkanoates as a binder in molding compositions provides improved binder removal in the finished molded product, and offers a wide range of physical properties suitable for use in a variety of processing conditions. The composition preferably includes a powdered material, such as a metal powder, ceramic powder, or blend, admixed with a polyhydroxyalkanoate binder. The compositions are useful in powder processing techniques, such as injection molding, slip casting, tape casting, or extrusion.
Inventors
- 👤 Edward Muller
- 👤 Daniel Horowitz
- 👤 Anna Egozy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62655; B; B22; B22F; B22F1/00; B22F1/10; B22F1/107; B22F3/00; B22F3/10; B22F3/1017; B22F3/1021; C04B35/01; C04B35/10; C04B35/111; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/63408; C04B35/6342; C04B35/63432; C04B35/63448; C04B35/6346; C04B35/63464; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5116; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C08; C08K; C08K3/00; C08K3/01; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08L; C08L67/00; C08L67/04; B22F3/20; B22F3/22; B22F3/225; C04B2235/00; C04B2235/60; C04B2235/604; C08L101/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
45 words
A composition comprising at least one powdered material admixed with at least one thermally decomposable copolymer of two or more hydroxyalkanoates wherein the powdered material is present in an amount between about 50% and 99.999% by weight based on total dry weight of the composition.
Claim 2
Dependent Claim
45 words
A composition comprising at least one powdered material admixed with at least one thermally decomposable copolymer of two or more hydroxyalkanoates wherein the powdered material is present in an amount between about 50% and 99.999% by weight based on total dry weight of the composition.
Claim 3
Dependent Claim
67 words
The composition of claim 1 wherein the copolymer includes one or more subunits having the chemical formula: --OCR.sup.1 R.sup.2 (CR.sup.3 R.sup.4).sub.n CO-- wherein n is 0 or an integer, and wherein R 1 , R 2 , R 3 , and R 4 are each selected from saturated and unsaturated hydrocarbon radicals; halo- and hydroxy-substituted radicals; hydroxy radicals; halogen radicals; nitrogen-substituted radicals; oxygen-substituted radicals; and hydrogen atoms.
Claim 4
Dependent Claim
21 words
The composition of claim 1 wherein the copolymer is selected from the group consisting of polyhydroxybutyrate-co-hydroxyvalerate, polyhydroxybutyrate-co-4-hydroxybutrate, polyhydroxybutyrate-co-3-hydroxyhexanoate, polyhydroxybutyrate-co-3-hydroxyheptanoate, and polyhydroxybutyrate-co-3-hydroxyoctanoate.
Claim 5
Dependent Claim
24 words
The composition of claim 1 further comprising a polymer selected from the group consisting of poly(lactic acid)s, poly(glycolic acid)s, copolymers thereof, and blends thereof.
Claim 6
Dependent Claim
23 words
The composition of claim 1 wherein the powdered material is selected from the group consisting of glass, ceramics, metal, alloys, and mixtures thereof.
Claim 7
Dependent Claim
31 words
The composition of claim 5 wherein the powdered material is a ceramic present in an amount between about 70% to 99.999% by weight based on total dry weight of the composition.
Claim 8
Dependent Claim
18 words
The composition of claim 1 further comprising one or more thermally depolymerizable polyhydroxyalkanoates polymer mixed with the copolymer.
Claim 9
Dependent Claim
16 words
The composition of claim 1 further comprising at least one thermally depolymerizable polymer other than polyhydroxyalkanoate.
Claim 10
Dependent Claim
23 words
The composition of claim 8 wherein the thermally depolymerizable polymer is selected from the group consisting of polycarbonates, polyolefins, polystyrenes, polacetals, and waxes.
Claim 11
Dependent Claim
12 words
The composition of claim 1 wherein the copolymer is dispersed in water.
Claim 12
Dependent Claim
18 words
The composition of claim 1 wherein the copolymer is dissolved in a solvent or a mixture of solvents.
Claim 13
Independent Claim
45 words
A method of a forming shaped product, the method comprising molding a composition comprising a powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate or a solution thereof to form the shaped product, and removing essentially all of the polyhydroxyalkanoate from the shaped product.
Claim 14
Independent Claim
45 words
A method of a forming shaped product, the method comprising molding a composition comprising a powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate or a solution thereof to form the shaped product, and removing essentially all of the polyhydroxyalkanoate from the shaped product.
Claim 15
Dependent Claim
23 words
The method of claim 12 wherein the powdered material is selected from the group consisting of glass, ceramics, metals, alloys, and mixtures thereof.
Claim 16
Dependent Claim
31 words
The method of claim 12 wherein the method of forming shaped products is selected from the group consisting of slip casting, tape casting, extrusion, injection molding, dry pressing, and screen printing.
Claim 17
Dependent Claim
20 words
The method of claim 12 the shaped product is heated to remove essentially all of the polyhydroxyalkanoate from the product.
Claim 18
Dependent Claim
38 words
A molded article formed by a method comprising molding a composition comprising a powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate or a solution thereof, and removing essentially all of the polyhydroxyalkanoate from the shaped product.
Claim 19
Dependent Claim
38 words
A molded article formed by a method comprising molding a composition comprising a powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate or a solution thereof, and removing essentially all of the polyhydroxyalkanoate from the shaped product.
Claim 20
Dependent Claim
38 words
A composition comprising at least one powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate wherein the powdered material is present in an amount greater than 75% by weight based on total dry weight of the composition.
Claim 21
Dependent Claim
38 words
A composition comprising at least one powdered material admixed with at least one thermally decomposable polyhydroxyalkanoate wherein the powdered material is present in an amount greater than 75% by weight based on total dry weight of the composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-06-06 | 2003-12-06 | 2004-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-06 | 2007-12-06 | 2008-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-06 | 2011-12-06 | 2012-06-06 | $7700.00 | Window Closed / Lapsed |