Biodegradable articles based on starch and process for producing them
US5262458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1990 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Nov 5, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F13/15252
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Formed articles comprising destructurized starch, an ethylene-acrylic acid copolymer and a product of the interaction of starch and ethylene-acrylic acid copolymer wherein the starch not bound to the copolymer is in the form of particles having sizes below 1 micron. The water content of such articles is lower than the one usually present in the starch. Said formed articles can also contain urea in an amount no higher than 30% by weight and/or ammonia in an amount not higher than 0.5% by weight. The process for obtaining such articles comprises the steps of extruding starch, an ethylene-acrylic acid copolymer and optionally water, urea and/or ammonia at a temperature ranging from 90.degree. to 150.degree. C., reducing the water content to values lower than 6% by weight and injection molding or extrusion blowing the resulting composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.