Patent US5234977A successfully refreshed from Google Patents.
US5234977A
Expired / Lapsed
US
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Starchy polymeric mixture particularly for the production of films and the like and a method for its production
Assignee: Novamont SpA
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Filing: 1991-07-23
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Granted: 1993-08-10
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Expires: 2011-07-23
Abstract
Abstract The material, which is usable for the production of biodegradable articles in film, sheet or fiber form, can be produced by extrusion from a molten mass including a synthetic thermoplastic polymer and a destructured starch to which a boron containing compound, such as boric acid, metaboric acid, borax and derivatives thereof has been added. Articles made of this material have improved transparency, Young's modulus and tear strength.
Inventors
- 👤 Catia Bastioli
- 👤 Vittorio Bellotti
- 👤 Alessandro Montino
- 👤 Gianfranco D. Tredici
- 👤 Roberto Lombi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L3/00; C08L3/02; C08K; C08K13/00; C08K13/02; C08K3/00; C08K3/38; C08K5/00; C08K5/04; C08K5/05; C08K5/053; C08K5/16; C08K5/20; C08K5/21; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L29/00; C08L29/02; C08L29/04; C08J2323/00; C08J2323/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
47 words
A composition useful for the production of biodegradable films, sheets, and fibers obtained from a molten mass, said molten mass comprising a synthetic thermoplastic polymer, destructured starch, a high boiling point plasticizer, up to 40 weight percent water referred to the starch/water system, and a boron-containing compound.
Claim 2
Dependent Claim
47 words
A composition useful for the production of biodegradable films, sheets, and fibers obtained from a molten mass, said molten mass comprising a synthetic thermoplastic polymer, destructured starch, a high boiling point plasticizer, up to 40 weight percent water referred to the starch/water system, and a boron-containing compound.
Claim 3
Dependent Claim
27 words
A composition according to claim 1, characterized in that the percentage of the compound containing boron, expressed as the boron content, is between 0.002 and 0.4% wt.
Claim 4
Dependent Claim
27 words
A composition according to claim 2, characterized in that the percentage of the compound containing boron, expressed as the boron content, is between 0.01 and 0.3% wt.
Claim 5
Dependent Claim
26 words
A composition according to claim 1 wherein the boron containing compound is selected from the group consisting of boric acid, metaboric acid, borax and derivatives thereof.
Claim 6
Dependent Claim
47 words
A composition according to claim 1 wherein said synthetic thermoplastic polymer is a polymer of at least one ethylenically unsaturated monomer, said polymer having repeating units provided with at least a polar group, selected from the group consisting of hydroxy, alkoxy, carboxy, carboxyalkyl, alkyl carboxy and acetal.
Claim 7
Dependent Claim
42 words
A composition according to claim 5, wherein said polymer is selected from the group consisting of polyvinyl alcohol and copolymers of an olefin selected from the group consisting of ethylene, propylene, isobutene and styrene with acrylic acid, vinyl alcohol or vinyl acetate.
Claim 8
Dependent Claim
26 words
A composition according to claim 6 wherein the synthetic polymer is selected from the group consisting of ethylene-vinyl alcohol, polyvinyl alcohol, ethylene-acrylic acid and mixtures thereof.
Claim 9
Dependent Claim
39 words
A composition according to claim 7 wherein the ethylene-vinyl alcohol copolymer has an ethylene content of between 10 and 90% and a melt flow index between 2 and 50 (at 21° C. and with a force of 2.16 kg).
Claim 10
Dependent Claim
47 words
A composition according to claim 8, wherein the ethylene-vinyl alcohol copolymer has an ethylene content between 10 and 40% by weight and a melt flow index between 6 and 20 (at 210° C. and with a force of 2.16 kg) and hydrolysis degree from 50 to 100%.
Claim 11
Dependent Claim
25 words
A composition according to claim 1, wherein the synthetic polymer and the starch are present in a ratio of between 1:19 and 19:1 by weight.
Claim 12
Dependent Claim
28 words
A composition according to claim 1, wherein the high boiling plasticizer is present in a concentration of from 0.05 to 100% of the weight of the starch component.
Claim 13
Dependent Claim
35 words
A composition according to claim 11, wherein the plasticizer is selected from the group consisting of glycerine, polyglycerol, polyethylene glycol, ethylene glycol, propylene glycol, mannitol, sorbitol, their acetate, ethoxylate or propoxylate derivatives and mixtures thereof.
Claim 14
Dependent Claim
27 words
A composition according to claim 1, comprising a starch destructuring agent selected from the group consisting of urea, alkaline hydroxides, alkali-metal hydroxides, alkaline-earth hydroxides and mixtures thereof.
Claim 15
Dependent Claim
24 words
A composition according to claim 1, comprising inorganic salts of alkali metals or alkaline earth metals added at concentrations of between 0.1 and 5%.
Claim 16
Dependent Claim
40 words
A method of producing a composition as described in claim 1, by forming a molten mass comprising a synthetic thermoplastic polymer and starch at a temperature between 100° and 220° C., wherein said molten mass comprises a boron containing compound.
Claim 17
Dependent Claim
45 words
A method according to claim 15, wherein the boron compound is boric acid which is added together with a plasticizer selected from the group consisting of glycerine, polyglycerol, polyethylene glycol, ethylene glycol, propylene glycol, mannitol, sorbitol, their ethoxylate, propoxylate or acetate derivatives and mixtures thereof.
Claim 18
Dependent Claim
16 words
An article in film, sheet or fiber form, produced from a composition according to claim 1.
Claim 19
Dependent Claim
90 words
The composition of claim 1 wherein the composition is obtained by extruding the molten mass and wherein the composition comprises: (a) from about 10 to about 50 weight percent synthetic thermoplastic polymer; (b) from about 20 to about 70 weight percent starch on a dry basis; (c) from about 2 to about 40 weight percent high boiling point plasticizer; (d) from about 0.002 to about 0.4 weight percent boron; (e) from about 0 to about 10 weight percent urea; and (f) from about 1 to about 5 weight percent water.
Claim 20
Dependent Claim
94 words
The composition of claim 18 comprising: (a) from 20 to 50 weight percent synthetic thermoplastic polymer selected from the group consisting of (i) ethylene-vinyl alcohol having an ethylene content of from 10 to 40 weight percent; (ii) polyvinyl alcohol; (iii) ethylene-acrylic acid; and (iv) combinations thereof; (b) from 30 to 60 weight percent starch on a dry basis; (c) from 5 to 25 weight percent high boiling point plasticizer; (d) from 0.01 to 0.3 weight percent boron; (e) from 2 to 7 weight percent urea; and (f) from 2 to 4 weight percent water.
Claim 21
Dependent Claim
18 words
The composition of claim 19 wherein the ethylene-vinyl alcohol has an ethylene content of from 28-40 weight percent.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |