Arkema France

Yannick Ederle

Olivier Guerret

Pierre Gerard

Ludwik Leibler

Bruno Vuillemin

Sylvain Bourrigaud

Denis Bertin

Jean-Yves Chenard

Jean-Michel Bruneau

Florence Chauvin

Anne-Valerie Ruzette

Stéphanie Pery

Anne-Valérie Ruzette-Foillard

Process for the preparation of impact-strengthened cast PMMA sheets comprising the following stages:

Cast acrylic plates with enhanced shockproofness

The invention relates to the production and use of block copolymers which are obtained by means of controlled radical polymerization 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&#xb0; C. and a thermoplastic end block having a glass transition temperature of more than 0&#xb0; C., thereby guaranteeing compatibility with the fragile matrix to be reinforced against impact.

Method of producing and using materials which are reinforced against impact and which contain block copolymers that are obtained by means of controlled radical polymerization in the presence of nitroxides

Thermoplastic composition comprising a (meth)acrylic (co)polymer and particles of hollow glass spheres&#x2014;or a mixture of particles of hollow glass spheres and particles of a mineral and/or organic compound&#x2014;the said particles scattering light:

Transparent thermoplastic composition comprising hollow glass beads

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Paris, France

Yannick Ederle