Thermoplastically processable starch-based materials, shaped articles manufactured therefrom and process for producing said materials
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsWolfgang Ritter, Michael Beck
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Abstract
Described are materials based on a starch which has been thermomechanically digested at elevated temperatures and pressures and upon the addition of water and/or lower molecular weight plasticizers and which contains oxidatively cross-linkable alkyd resins having been incorporated in an intimate admixture. Preferably, these alkyd resins have been at least predominantly composed of key substances based on re-growable raw materials. The starch blends thus modified are suitable for the manufacture of shaped articles which in the presence of air will be reactively cured and thereupon are imparted with an increased strength, and especially an increased resistance to water.
Claims44
A thermoplastically deformable composition comprising a mixture of a thermomechanically digested starch and an oxidatively reactive cross-linking alkyd resin said mixture being the product of a process comprising;
- thermomechanically digesting starch at a temperature from above 100.degree. C. to about 170.degree. C. and at least the intrinsic pressure of the mixture in admixture with a first material selected from the group consisting of water, lower molecular weight plasticizer, and mixtures thereof, and a second material comprised of an oxidatively reactive cross-linking alkyd resin.
A process for producing a thermoplastically deformable composition comprising:
- mixing in a mixing zone native starch with an aqueous dispersion of an oxidatively cross-linking alkyd resin at a temperature above 100.degree. C. to about 170.degree. C. under at least intrinsic pressure of the mixture, whereby a thermoplastically deformable starch is formed.
Dependencies are inferred from the claim text.