Photodegradable plastics material and its use

Details Photodegradable plastics material and its use Photodegradable plastics material and its use

A - Human Necessities

24

D

A24D 3/10 (2006.01) C08K 9/02 (2006.01) C08L 1/12 (2006.01) C09C 1/36 (2006.01) C08K 3/22 (2006.01)

Patent

CA 2733652

A photodegradable plastic is described, comprising cellulose esters and also, if appropriate, additives. A particular characterizing feature of this photodegradable plastic is that it comprises a dispersed photocatalytic carbon-modified titanium di-oxide. Comparative experiments show that this photodegradable plastic exhibits a surprisingly high increase in photocatalytic de-gradability when compared with products in which a conventional or other modified titanium dioxide is used. This improvement is apparent in particular in use of the photodegradable plastic according to the invention when it is further processed to give mol-dings. The photodegradable plastic can, for example, first be further processed to give a filter tow. This can be used to produce fil-ter rods, and these can then be used to produce filter plugs for filter- tip cigarettes.

L'invention concerne une matière plastique photodégradable possédant une teneur en esters cellulosiques, ainsi que des additifs éventuels. Cette matière plastique photodégradable est particulièrement caractérisée par le fait qu'elle contient du dioxyde de titane dispersé, actif sur le plan photocatalytique et modifié par carbone. Des essais comparatifs démontrent que cette matière plastique photodégradable présente une augmentation considérable de la dégradation photocatalytique par rapport à des produits dans lesquels on a introduit une quantité usuelle ou autrement modifiée de dioxyde de titane. Cette amélioration est particulièrement flagrante quand on utilise la matière plastique photodégradable afin de la transformer en articles moulés. De ce fait, on peut la transformer en une étoupe filtrante permettant de fabriquer des bâtonnets filtrants dont on tire des filtres de cigarette.

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