Polymer solution and dispersion and a process or the preparation thereof
AssigneeValtioin Teknillinen Tutkimuskeskus
InventorsHannu Mikkonen, Maarit Tarvainen, Soili Peltonen, Timo Paronen
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Abstract
A polymer dispersion or solution containing a hydrophobic polysaccharide, which is dispersed or dissolved in liquid phase, and palsticizer composition of the polysaccharide, whereby at least 10% by weight of the plascitizer composition is formed from alkenyl succinic anhydride. The invention also relates to the preparation of polymer dispersions and solutions and to the films and coatings produced from them. The dispersions according to the invention are stable, and coating with excellent film-forming properties can be prepared from them.
Claims16
A polymer dispersion or solution containing
- a hydrophobic polysaccharide, which is dispersed or dissolved in liquid phase, and
- a plasticizing composition of the polysaccharide,
- characterized in that at least 10% by weight of the plasticizing composition consists of alkenyl succinic anhydride.
The polymer dispersion or solution according to any of the preceding claims, characterized in that the plasticizing composition constitutes 10-70% by weight of the dry content of the dispersion or the solution.
A polymer coating/coating for pharmaceutical preparations containing polysaccharides and/or polysaccharide derivatives, characterized in that the plasticizer of the polymer contains an anhydride of alkenyl succinate.
A method for preparing hydrophobic polymer dispersion, according to which method
- a) a mixture consisting of a biopolymer, plasticizing agent, dispersion admixtures and water is formed,
- b) said mixture is heated to form a paste-like composition, and
- c) the paste-like composition is diluted in water,
- characterized in that at least 10% by weight of the plasticizing agent consists of an alkenyl succinic anhydride.
Dependencies are inferred from the claim text.