Method for producing a biologically degradable polyhydroxyalkanoate coating with the aid of an aqueous dispersion of polyhydroxyalkanoate
US5958480A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D167/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for producing a biologically degradable polyhydroxyalkanoate coating in the form of an elastomeric film, wherein an aqueous dispersion of polyhydroxyalkanoate or a mixture of polyhydroxyalkanoates is prepared and the dispersion is applied to the surface to be coated, after which water is made or allowed to evaporate to obtain a polyhydroxyalkanoate film, the film formation taking place at a temperature lower than the melting point of the polyhydroxyalkanoate, such a temperature even for example being more than 35.degree. C. below the melting point and in which the polyhydroxyalkanoate used is a polymer which is made up of saturated or unsaturated 3-hydroxy fatty acids having a carbon-chain length of 6-14 and/or is a Pseudomonas polyhydroxyalkanoate other than a polymer or copolymer of .beta.-hydroxyvalerate or .beta.-hydroxybutyrate, without requiring additional steps to render the film elastomeric. Product coated with such a polyhydroxyalkanoate film, in particular a coated product to be applied to or consumed by a human being or animal or a product which must not be exposed to a temperature equal to or more than 100.degree. C., such as cheese.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.