Loading patent…
AssigneeValtion Teknillinen Tutkimuskeskus
InventorsSoili Peltonen, Pertti Tiitola, Jani Vuorenp{umlaut over (aa)}, Harri Happonen, Pertti Törmälä
Estimating the term…
The invention concerns a hydroxypropyl starch ester (HPS ester), compositions containing it, and a process for the preparation thereof. According to the invention, the molar substitution in the HPS ester is 2 at the most and the substitution degree in the ester group is at least 1. The HPS ester is prepared by hydroxypropylating a starch-containing base material in an aqueous alkanol medium. A starch component can be prepared of the HPS ester containing 90 to 60% by weight HPS ester and 10 to 40% by weight of a plasticizer. Compositions which are suited for, e.g., coating board or paper and for use as a component in labelling adhesives or paint, can be made from the starch component by combining it with auxiliaries known as such within the polymer and plastics technology.
A hydroxypropyl starch ester, comprising an ester group derived from acetic acid, propionic acid or butyric acid or from a mixture thereof, the molar substitution of the hydroxypropyl group being 1.4 at the most and the degree of substitution of the ester group at least 1.
A thermoplasticized starch component, characterized in that it contains
The composition of claim 13, characterized in that it comprises fibres of a lactic acid-based polymer, cellulose mass, corn-based cellulose fibre material, corn-based pentosan, cotton linters, fibres of Abaca hemp, sisal fibres, ramie fibres, flax fibres, jute fibres, or biodegradable glass fibres.
The composition of claim 15, characterized in that it contains dispersion auxiliaries.
Dependencies are inferred from the claim text.