Film-forming, starchy, polymeric composition and shaped articles, particularly films and sheets, which can be produced from the composition and have a good barrier effect, and a method of producing the articles
AssigneeNovamont S.p.A.
InventorsCatia Bastioli, Vittorio Bellotti, Gianfranco Del Tredici, Alessandro Montino, Roberto Ponti
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Abstract
The film-forming polymeric compositions described include a synthetic, thermoplastic polymer and a starchy material, with a high amylopectin content; they enable the production of films, sheets and the like having good liquid- and gas-barrier effects and improved mechanical properties.
Claims18
A polymeric composition which can be produced from a melt comprising:
- i) a starchy material component;
- ii) a synthetic, thermoplastic, polymeric component;
- and
- iii) a quantity of from 2 to 7% by weight of urea, with reference to the weight of the total composition,
- wherein the starchy material includes at least 78% by weight of amylopectin.
A polymeric composition comprising:
- i) a starchy material component, including at least 78% by weight of amylopectin;
- and
- ii) a synthetic, thermoplastic, polymeric component;
- wherein said polymeric composition comprises from 20 to 90% by weight of amylopectin material with reference to the sum of the synthetic, thermoplastic, polymeric component and the starchy component, and
- wherein the synthetic, thermoplastic, polymeric component comprises a mixture of poly-epsilon-caprolactone and polyethylene-vinyl alcohol in a ratio of from 1:4 to 4:1 by weight.
A polymeric composition comprising:
- i) a starchy material component, including at least 78% by weight of amylopectin;
- and
- ii) a synthetic, thermoplastic, polymeric component;
- wherein said polymeric composition comprises from 20 to 90% by weight of amylopectin material with reference to the sum of the synthetic, thermoplastic, polymeric component and the starchy component, and
- wherein the synthetic, thermoplastic, polymeric component includes a mixture of polyethylene-vinyl acetate and poly-epsilon-caprolactone in a ratio of from 1:4 to 4:1 by weight.
A film having a water permeability at 23.degree. C. of less than 400 gr.30 microns/m.sup.2.24 hr, which can be prepared by the extrusion or blow extrusion of a polymeric composition including a starchy polymeric component and a synthetic thermoplastic polymeric component, in which the starchy polymeric component includes at least 78% by weight of amylopectin.
A method of producing films, sheets, fibers and filaments by the extrusion of a melt including a synthetic, thermoplastic, polymeric component and an amylopectin component, in which the melt output from the extruder is subjected to axial stretching.
Dependencies are inferred from the claim text.