C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1339, 6/99
C08L 1/00 (2006.01) B29C 45/00 (2006.01) C08L 97/00 (2006.01) C08L 97/02 (2006.01)
Patent
CA 1248254
A B S T R A C T This invention deals with a new plasticized biodegradable, highly fibrous material, suitable for injection molding. This material is producod from wood waste and bark as basic materials. SUMARY OF THE INVENTION In accordance with present invention, a thermoplastic material is provided by reacting a bark extract with synthetic or natural latex. The exact chemical reaction had not been elucidated and I do not wish to be bound to any theory. Theoreticaly several reaction systems can be involved at the same time. The bark extract may be prepared by many different technologies. All the bark extracts tested, react with natural and synthetic latexes, but with different speed of reaction. The speed of reaction is directly dependant on the type of latex, quantity of solids in extract, PH of reacting media, temperature of reacting media and agitation of reacting components. The bark - latex material is not used itself as a material for injection molding, but in course of preparation, it is simultaneously filled by already extracted bark residue and organic fibres. After reactions are completed and fibres are completely soaked in emulsion, PH of reaction media is adjusted to proper level, an unabsorbed water is separated and drained. The drained product is dryed to maximum water content of 4%. Drying can be done in any conventional drying equipment, but vacuum drying is prefered. The dryed material can be used directly for injection molding, in spite of being very light. For correct feeding of injection machine, some method of volume reduction should be employed. One of good methods of volume reduction is use of an extruder with vented barrel. The extruder has to be able to prouce pelleted or spaghetti type of extruded material. - 1 -
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