C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 29/04 (2006.01) B29C 47/06 (2006.01) B32B 7/02 (2006.01) B65D 65/46 (2006.01) A61F 13/46 (1990.01)
Patent
CA 2134101
2134101 9322125 PCTABS00027 Improvements in the manufacture of multi-layer organic polymer composites are described, particularly applicable to composites including adjacent layers of a relatively water-soluble polymer (e.g. partially hydrolysed polyvinyl alcohol) and a relatively water-insoluble polymer (e.g. fully hydrolysed polyvinyl alcohol). The extruded layers are brought together within the die housing or by nipping means external to the die, or the relatively water-insoluble layer may be coated onto the relatively water-soluble layer. Specific designs of die are claimed, as are specific extrudable compositions and apparatus for conveying the same to the dies. The invention makes available for the first time a range of articles in which plastic parts are water-compatible in normal use but are completely degradable on contact with water during disposal, such as WC-disposable sanitary articles and water-degradable rigid containers for oil and petrol.
Goninan Kevin Mark
Taylor Paul Anthony
British Technology Group Intercorporate Licensing Limited
Fetherstonhaugh & Co.
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