Moulding compositions with diffusing properties and...

Details Moulding compositions with diffusing properties and... Moulding compositions with diffusing properties and...

C - Chemistry, Metallurgy

08

L

C08L 33/10 (2006.01) C08F 2/18 (2006.01) C08F 2/24 (2006.01)

Patent

CA 2365773

The present invention relates to a moulding composition with diffusing properties, comprising matrix polymers and bead polymers with an average particle size in the range from 5 to 40 µm, whose refractive index n D at 20°C differs from that of the matrix polymer, where the bead polymers are prepared by a process in which a polymerizable mix which comprises at least 50% by weight of (meth)acrylates is dispersed in an aqueous phase and polymerized. The dispersion, stabilized with an aluminium compound, is prepared at a shear rate >= 10 3 s-1. The present invention further relates to mouldings which can be obtained by moulding the moulding compositions of the invention, and which have diffusing properties.

La présente invention est un mélange à mouler doté de propriété diffusantes, qui comprend des matrices polymériques et des billes polymériques de dimensions granulométriques de 5 à 40 mu.m, dont l'indice de réfraction de n D à 20 degrés C diffère de celui de la matrice polymérique. Les billes polymériques sont préparées au moyen d'un processus dans lequel un mélange polymérisable, comprenant au moins 50 % en poids de méthacrylate, est dispersé dans une phase aqueuse et polymérisé. La dispersion, stabilisée au moyen d'un composé d'aluminium, est préparée à une vitesse de cisaillement de >= 10 3 s-1. La présente invention se rapporte aussi à des moulages qui peuvent être obtenus en moulant les mélanges à mouler de l'invention, et qui ont des propriétés diffusantes.

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