Starch-based materials and/or molded parts modified by synthetic polymer compounds and process for producing the same

US5439953A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Wolfgang Ritter · Düsseldorf, DE
• Rainer Bergner · Goldkronach, DE
• Wolfgang Kempf · Neunburg vorm Wald, DE

Key dates

• Filing date: Oct 12, 1993
• Grant date: Aug 8, 1995
• Expiry date: Oct 12, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L3/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed are materials and/or shaped articles based on a starch which has been thermomechanically digested at elevated pressures and temperatures and with the addition of water and/or lower molecular weight plasticizing agents, said starch containing thermoplastic synthetic polymer compounds in an at least largely homogeneous mixture. The materials and/or shaped articles according to the invention are characterized in that their contents of synthetic thermoplastic polymer compounds is derived from aqueous polymer dispersions comprising a disperse polymer phase in an aqueous phase and that the synthetic thermoplastic polymer compounds have been incorporated in the starch in combination with the aqueous phase in such a manner that the starch digestion has been effected by the concomitant use of the aqueous phase of the polymer dispersions. Said materials and/or shaped articles have been preferably produced by a process wherein the starch digestion to form a thermoplastic material has occurred together with homogeneously mixing the aqueous polymer dispersions into the starch in one process step.