METHOD FOR PRODUCING COMPOSITE MATERIALS
The invention relates to a continuous method for producing, by using microparticles, thermoplastics provided with reinforcement fibres. The production methods relate to such composite materials, which contain the reinforcement fibres in a parallel (or predominantly parallel) arrangement in the thermoplastic matrix.
1 .- 15 . (canceled)
16 . A process for producing polymer prepregs comprising at least the following steps:
applying microparticles to a woven fibre fabric, laid fibre scrim, fibre non-woven or the like,
melting by introducing heat,
wherein at least 80% of the microparticles have a contour angle of >90°.
17 . The process according to claim 16 , wherein at least 90% of the microparticles have a contour angle of >90°.
18 . The process according to claim 16 , wherein at least 95% of the microparticles have a contour angle of >90°.
19 . The process according to claim 16 , wherein the contour angle of the microparticles is >105°.
20 . The process according to claim 16 , wherein the contour angle of the microparticles is >120°.
21 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter smaller than or equal to 2000 μm.
22 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter smaller than or equal to 1700 μm.
23 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter smaller than or equal to 1300 μm.
24 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter greater than or equal to 100 μm.
25 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter greater than or equal to 200 μm.
26 . The process according to claim 16 , wherein at least 80% of the microparticles have a maximum diameter greater than or equal to 400 μm.
27 . A polymer prepreg obtained by the process according to claim 16 .
28 . A method comprising utilizing the polymer prepreg according to claim 27 for producing composite materials.
29 . A process for producing a composite material, wherein at least the following steps are performed:
preparing microparticles, where at least 80% of the microparticles have a contour angle of >90°,
preparing a microparticle prepreg, and
pressing the microparticle prepreg to give a composite material.
30 . A composite material obtained by the process according to claim 29 .