US4873270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane-carbohydrate-based substances which can be calendered to produce biodegradable materials
Assignee: Pennel et Flipo SAS
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Filing: 1988-02-09
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Granted: 1989-10-10
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Expires: 2008-02-09
Abstract
Abstract A substance based on polyurethane from which biodegradable materials can be obtained by rolling comprises, as well as a polyurethane resin serving as its essential constituent, a carbohydrate, at least one second thermoplastic polymer which is miscible in the molten state with the polyurethane resin and/or at least one third biodegradable polymer chosen from among biodegradable aliphatic polyesters, preferably of the same nature as the polyurethane resin used.
Inventors
- 👤 Jean-Marc Aime
- 👤 Georges Mention
- 👤 Andre Thouzeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:15
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08L75/06; C08L2201/00; C08L2201/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
72 words
Polyurethane-based substance which can be calendered to produce a biodegradable material, comprising a homogeneous mixture of a thermoplastic polyurethane resin, a carbohydrate, at least one second thermoplastic polymer which is miscible in the molten state with said polyurethane rein and which gives the mixture the ability to be calendered and which comprises polyvinylchloride, and at least one third biodegradable polymer different from said polyurethane resin and which is a biodegradable aliphatic polyester.
Claim 2
Dependent Claim
72 words
Polyurethane-based substance which can be calendered to produce a biodegradable material, comprising a homogeneous mixture of a thermoplastic polyurethane resin, a carbohydrate, at least one second thermoplastic polymer which is miscible in the molten state with said polyurethane rein and which gives the mixture the ability to be calendered and which comprises polyvinylchloride, and at least one third biodegradable polymer different from said polyurethane resin and which is a biodegradable aliphatic polyester.
Claim 3
Dependent Claim
33 words
Substance according to claim 1, wherein said polyurethane resin has a polyester base, and said at least one third biodegradable polymer is of the same nature as the polyester base of said polyurethane.
Claim 4
Dependent Claim
25 words
Substance according to claim 1, wherein said second polymer consists essentially of polyvinylchloride or a mixture of polyvinylchloride and a monomeric or polymeric polyvinylchloride plasticizer.
Claim 5
Dependent Claim
11 words
Substance according to claim 3, wherein said plasticizer is a phthalate.
Claim 6
Dependent Claim
10 words
Substance according to claim 4, wherein said plasticizer is dioctylphthalate.
Claim 7
Dependent Claim
28 words
Substance according to claim 3, wherein said second polymer is present in the amount of 25 to 100 % by weight with respect to the amount of carbohydrate.
Claim 8
Dependent Claim
47 words
Substance according to claim 1, wherein said carbohydrate is a compound selected from the group consisting of potato flour, starch, modified starch, cellulose, cellulose derivatives, dextrin, and lactose and is used in a proportion of 10 to 45 % by weight with respect to the whole mixture.
Claim 9
Dependent Claim
14 words
Substance according to claim 1, wherein said polyurethane resin is a polycaprolactone based polyurethane.
Claim 10
Dependent Claim
12 words
Substance according to claim 8, wherein said polycaprolactone is poly-ε-caprolactone or poly-β-caprolactone.
Claim 11
Dependent Claim
26 words
Substance according to claim 1, wherein said third polymer is present in a proportion of up to 20 weight percent with respect to the whole mixture.
Claim 12
Dependent Claim
20 words
Substance according to claim 1, wherein said third polymer is a caprolactone and said polyurethane resin is a caprolactone-based polyurethane.
Claim 13
Dependent Claim
15 words
Substance according to claim 1, wherein said third polymer is a poly-β-hydroxybutyrate or a polyhydroxyvalerate.
Claim 14
Dependent Claim
25 words
A method of manufacturing biodegradable sheet, film, and plate products, comprising forming a polyurethane-based substance according to claim 1 into a sheet, film or plate.
Claim 15
Dependent Claim
18 words
A product in biodegradable sheet, film or plate form manufactured from a polyurethane-based substance according to claim 1.
Claim 16
Dependent Claim
21 words
Mortuary wrappings, agricultural films, flexible packaging films, filling materials and padding materials manufactured from a polyurethane-based substance according to claim 1.
Claim 17
Dependent Claim
14 words
A method according to claim 13 wherein said forming is carried out by calendering.
Claim 18
Dependent Claim
16 words
A product according to claim 14 wherein said sheet, film or plate is manufactured by calendering.
Claim 19
Dependent Claim
19 words
Mortuary wrappings, agricultural films, flexible packaging films, filling materials and padding materials according to claim 15 made by calendering.
Claim 20
Dependent Claim
62 words
A biodegradable homogeneous plastic composition comprising a thermoplastic polyurethane resin, an amount sufficient of a carbohydrate in fine particle form to make such composition in film form biodegradable, and an amount sufficient to make said composition calenderable of at least one second thermoplastic polymer which is miscible in the molten state with said thermoplastic polyurethane resin, said second thermoplastic polymer comprising PVC.
Claim 21
Dependent Claim
62 words
A biodegradable homogeneous plastic composition comprising a thermoplastic polyurethane resin, an amount sufficient of a carbohydrate in fine particle form to make such composition in film form biodegradable, and an amount sufficient to make said composition calenderable of at least one second thermoplastic polymer which is miscible in the molten state with said thermoplastic polyurethane resin, said second thermoplastic polymer comprising PVC.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-09 | 1993-04-10 | 1993-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-09 | 1997-04-10 | 1997-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-09 | 2001-04-10 | 2001-10-10 | $7700.00 | Window Closed / Lapsed |