Method for producing moulded parts
AssigneeBio-Tec Biologische Naturverpackungen GmbH
InventorsHarald Schmidt, Christoph Hess, Wolfgang Friedek
Life of this patent
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Abstract
A process is presented and described for the production of moldings, comprising the steps of (a) providing a polymer composition comprising from 1 to 99% by weight of polyhydroxyalkanoate and from 1 to 99% by weight of starch-containing polymer; (b) homogenizing the polymer composition with use of thermal and/or mechanical energy; (c) introducing the polymer composition into a mold; (d) molding the molding in the mold; and (e) removing the molding from the mold. The process described is in particular suitable for the production of hard capsules.
Claims25
A process for the production of a molding, comprising:
- a. providing a polymer composition comprising from 1 to 99% by weight of polyhydroxyalkanoate and from 1 to 99% by weight of starch-containing polymer and such that the polyhydroxyalkanoate and the starch-containing polymer together constitute at least 90% by weight of the polymer composition;
- b. homogenizing the polymer composition with use of thermal and/or mechanical energy and adjusting the water content of the polymer composition to less than 5% by weight of the polymer composition, wherein starch or functionalized starch present in the starch-containing polymer is destructured during the homogenization;
- c. introducing the homogenized polymer composition into a mold;
- d. molding the homogenized polymer composition in the mold to form a molding that consists essentially of the homogenized polymer composition;
- and
- e. removing the molding from the mold.
A process for the production of a molding, comprising:
- a. providing a polymer composition comprising from 1 to 99% by weight of polyhydroxyalkanoate and from 1 to 99% by weight of starch-containing polymer and such that the polyhydroxyalkanoate and the starch-containing polymer together constitute at least 90% by weight of the polymer composition;
- b. homogenizing the polymer composition with use of thermal and/or mechanical energy and adjusting the water content of the polymer composition to less than 5% by weight of the polymer composition, wherein starch or functionalized starch present in the starch-containing polymer is destructured during the homogenization;
- c. forming the homogenized polymer composition from step b. into a sheet or film consisting essentially of the polymer composition;
- d. thermoforming the sheet or film consisting essentially of the polymer composition in a mold to form a molding;
- and
- e. removing the molding from the mold.
A process for the production of a molding, comprising:
- a. providing a polymer composition comprising from 1 to 99% by weight of polyhydroxyalkanoate and from 1 to 99% by weight of starch-containing polymer, wherein the polyhydroxyalkanoate and the starch-containing polymer are together included in an amount of from 90% to 100% by weight of the polymer composition, wherein the polymer composition comprises less than 10% by weight, based on the total weight of starch and plasticizer, of a carbon-containing plasticizer with molar mass 500 g/mol or less;
- b. homogenizing the polymer composition with use of thermal and/or mechanical energy and adjusting the water content of the polymer composition to less than 5% by weight of the polymer composition;
- c. injection molding the homogenized polymer composition in a mold to form a molding that consists essentially of the polymer composition;
- and
- d. removing the molding from the mold.
Dependencies are inferred from the claim text.