Translucent fibre composite materials comprising chemically modified polymers

A fiber composite material W obtained by a method comprising the steps of:

• (i) providing:
• (A) 20-99.5 wt % of a polymer matrix in the form of a thermoplastic polymer composition A comprising:
• (A1) at least one copolymer C comprising monomers A-I and monomers A-II and optionally further monomers;
• (A2) optionally one or more dyes F;
• and
• (A3) optionally one or more assistants H;
• and
• (B) 0.5-80 wt % of fibers B whose surface displays functional groups B-I which are capable of forming a covalent bond with said monomers A-I, but not with said monomers A-II;
• (C) 0-79.5 wt % of polymer D, and
• (D) optionally one or more adhesion promoters,
• (ii) melting said thermoplastic polymer composition A and contacting same with said fibers B from step (i);
• and
• (iii) reacting at least some of said monomers A-I of said copolymer C and at least some of said functional groups B-I of said fibers B from step (ii) to form covalent bonds,
• wherein optionally the light transmission through said obtained fiber composite material W is not less than 10% higher than with a comparable fiber composite material that is the same as the fiber composite material W except that monomers A-II fully replace said monomers A-I, and
• wherein the flexural strength of said fiber composite material W is not less than 20% higher than with a comparable fiber composite material that is the same as the fiber composite material W except that monomers A-II fully replace said monomers A-I.