Method of producing plasticised polyvinyl alcohol, and its...

Details Method of producing plasticised polyvinyl alcohol, and its... Method of producing plasticised polyvinyl alcohol, and its...

C - Chemistry, Metallurgy

08

L

C08L 29/04 (2006.01) C08J 3/18 (2006.01) C08K 5/00 (2006.01) C08L 3/02 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2123092

2123092 9309171 PCTABS00022 The method of producing plasticised polyvinyl alcohol by mixing polyvinyl alcohol in the presence of an organic plasticiser and water in a quantity which is insufficient to dissolve the polyvinyl alcohol under normal conditions, includes the steps of: i) pre-plasticising the polyvinyl alcohol at a maximum temperature no higher than its softening point so as to produce a pre-plasticised polyvinyl alcohol having a melting point below the softening point of the polyvinyl alcohol used, and ii) further processing the pre-plasticised polyvinyl alcohol thus produced at a temperature above its melting point, under shear-stress conditions and for a period of time such as to produce a substantially homogeneous melt.

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