Stabiliser combinations for polymer systems

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 13/02 (2006.01) C08K 3/32 (2006.01) C08K 5/13 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2479105

The invention relates to stabilising combinations of antioxidants comprising sterically hindered phenol groups and special water-soluble, inorganic phosphorous compounds. The invention also relates to a method for producing graft rubber polymers, obtained by emulsion polymerisation, with improved thermal stability during the drying process, in addition to an improved characteristic profile and to graft rubber polymers obtained by said method. The invention further relates to thermoplastic moulding materials with a modified impact-resistance, in particular ABS moulding materials, which contain said graft rubber polymers as impact-resistance modifiers. The moulding materials are characterised by an improved odour after thermoplastic processing.

L'invention concerne des combinaisons à effet stabilisant, constituées d'antioxydants pourvus de groupes phénol à encombrement stérique et de composés phosphore inorganiques spéciaux solubles dans l'eau. L'invention concerne également un procédé servant à produire des polymères caoutchouteux greffés, obtenus par polymérisation d'émulsion et présentant une thermostabilité améliorée lors de l'étape de séchage ainsi qu'un profil de propriétés amélioré, ainsi que les polymères caoutchouteux greffés obtenus par ce procédé. L'invention concerne en outre des matières moulables thermoplastiques à résistance au choc modifiée, notamment des matières moulables ABS, qui contiennent ces polymères caoutchouteux greffés en tant que modificateurs de résistance au choc. Les matières moulables selon l'invention se caractérisent par un comportement aux odeurs amélioré après traitement thermoplastique.

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