C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 53/00 (2006.01) C08L 33/08 (2006.01) C08L 33/10 (2006.01) C08L 101/00 (2006.01) C08F 293/00 (2006.01)
Patent
CA 2473791
The invention relates to the production and use of block copolymers which are obtained by means of controlled radical polymerisation in the presence of nitroxides for the purpose of reinforcing fragile polymer matrices. The invention offers advantages such as (i) simplicity of copolymer synthesis and use and (ii) fine dispersion of the copolymer molecules in the fragile matrix, which ensures both the transparency of the material and high reinforcement against impact. More specifically, the invention relates to the radical synthesis of block copolymers comprising at least three blocks, which include one block having a glass transition temperature of less than 0 ~C and a thermoplastic end block having a glass transition temperature of more than 0 ~C, thereby guaranteeing compatibility with the fragile matrix to be reinforced against impact.
L'invention décrit la mise en oeuvre et l'utilisation de copolymères blocs obtenus par polymérisation radicalaire contrôlée en présence de nitroxydes dans le but de renforcer des matrices polymères fragiles. Un avantage de l'invention consiste en la simplicité de synthèse et de mise en oeuvre des copolymères. Un autre avantage de l'invention consiste en la dispersion fine des molécules de copolymères dans la matrice fragile qui assure à la fois une transparence du matériau et un bon renforcement au choc. Particulièrement, l'invention décrit la synthèse de copolymères à blocs par voie radicalaire possédant au moins trois blocs dont un bloc possède une température de transition vitreuse inférieure à 0·C et un bloc terminal thermoplastique de température de transition vitreuse supérieur à 0·C assurant la compatibilité avec la matrice fragile que l'on souhaite renforcer au choc.
Bertin Denis
Chauvin Florence
Ederle Yannick
Gerard Pierre
Guerret Olivier
Atofina
Robic
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