Additive for thermoplastics, use of and method for its...

C - Chemistry – Metallurgy – 08 – K

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C08K 5/098 (2006.01)

Patent

CA 2523250

Method for preparing an additive for thermoplastic materials to achieve controlled degradation thereof, yet allowing manufacture of very light coloured thermoplastics. The thermoplastics may be processed by means like film blowing, extrusion and injection moulding. A ferric(III) salt is reacted with a C2 - C24 fatty acid or derivative thereof under formation of a fat- soluble ferric(III) compound in a process where a suitable oxidizing agent ensures that all the iron in the end product is maintained in the ferric state. The invention further relates to the additive as such, a method for preparing modified thermoplastics with such additive and finally the thus modified thermoplastic materials.

La présente invention concerne un procédé de préparation d'un additif pour matériaux thermoplastiques qui permet de parvenir à une dégradation contrôlée de ces derniers et de fabriquer néanmoins des thermoplastiques aux couleurs très claires. Les thermoplastiques de l'invention peuvent être traités par des moyens tels que le soufflage de feuille mince, le moulage par extrusion et le moulage par injection. Selon l'invention, on fait réagir un sel ferrique (III) avec un acide gras C¿8?-C¿24? ou un dérivé de ce dernier afin de former un composé ferrique (III) soluble dans les graisses au cours d'un processus où un agent oxydant adéquat garantit que la totalité du fer présent dans le produit fini est maintenue à l'état ferrique. L'invention se rapporte en outre à l'additif en tant que tel, à un procédé de préparation de thermoplastiques modifiés à l'aide de l'additif précité et enfin, aux matériaux thermoplastiques modifiés de la sorte.

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