Abstract: The invention relates to a hydrophobic polymer dispersion and a solvent-free process for the preparation thereof. According to the invention, the dispersion contains starch ester together with dispersion admixtures known as such. According to the process, the polymer is first mixed with a plasticizer in order to obtain a plasticized polymer blend. The plasticized polymer blend is then mixed with dispersion admixtures and water at an elevated temperature so as to form a dispersion. The plasticizing of the polymer and the dispersion of the mixture in water can be performed in an extruder. The obtained dispersion is homogenized in order to improve its stability. The dispersion obtained by the invention can be used to coat paper or board, as a primer or a component in paint or labeling adhesives, and it is also suitable for the production of cast films and as a binder in materials based on cellulose fibers, as well as for coating medicinal preparations.
Type:
Grant
Filed:
February 24, 1999
Date of Patent:
December 2, 2003
Assignee:
Oy Polymer Corex Kuopio Ltd.
Inventors:
Kristiina Haasmaa, Timo Petteri Paronen, Arto Olavi Urtti, Soili Peltonen, Maija Elina Heikkilä, Jani Vuorenpää
Abstract: The invention relates to a hydrophobic polymer dispersion and a solvent-free process for the preparation thereof. According to the invention, the dispersion contains starch ester together with dispersion admixtures known as such. According to the process, the polymer is first mixed with a plasticizer in order to obtain a plasticized polymer blend. The platicized polymer blend is then mixed with dispersion admixtures and water at an elevated temperature so as to form a dispersion. The plasticizing of the polymer and the dispersion of the mixture in water can be performed in an extruder. The obtained dispersion is homogenized in order to improve its stability. The dispersion obtained by the invention can be used to coat paper or board, as a primer or a component in paint or labelling adhesives, and it is also suitable for the production of cast films and as a binder in materials based on cellulose fibers, as well as for coating medicinal preparations.
Type:
Application
Filed:
October 5, 2001
Publication date:
March 14, 2002
Applicant:
Oy Polymer Corex Kuopio Ltd.
Inventors:
Kristiina Haasmaa, Timo Petteri Paronen, Arto Olavi Urtti, Soili Peltonen, Maija Elina Heikkila, Jani Vuorenpaa
Abstract: The present invention is related to a novel type of composition with modifiable properties and suitable for controlled release of active ingredients in industrial use. The composition contains an active ingredient and starch acetate in the form of a compact. More specifically the invention relates to active ingredients such as solid dosage forms of drugs, especially compacts and tablets. In these compacts starch acetate with distinct substitution degrees are used. The starch acetate makes the process industrially feasible with good flowability and facilitates the formation of firm tablets. Starch acetate enables the controlled release of the active ingredient. The invention also discloses method for the preparation of the composition as well as its use.
Type:
Grant
Filed:
January 19, 1995
Date of Patent:
September 16, 1997
Assignee:
Oy Polymer Corex Kuopio Ltd.
Inventors:
Timo Petteri Paronen, Soili Hellevi Peltonen, Arto Olavi Urtti, Leena Johanna Nakari