Thermoplastic molding composition having improved...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 51/04 (2006.01) C08F 263/04 (2006.01) C08F 265/04 (2006.01) C08F 279/02 (2006.01) C08L 27/06 (2006.01) C08L 33/08 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2404396

A thermoplastic molding composition which features improved dimensional stability and low gloss is disclosed. The composition which contains (A) a first grafted rubber having a weight average particle size of 0.05 to 0.30 microns, (B) a second grafted rubber having a weight average particle size of 0.31 to 1.00 microns, (C) vinyl chloride (co) polymer, and, optionally, (D) styrene copolymer, is especially suitable for extruding profiles. In a preferrred embodiment, at least one of the grafted rubbers is characterized in that its substrate features a core-shell structure, wherein the core contain at least one crosslinked vinylaromatic polymer, and the shell is elastomeric.

L'invention porte sur une composition de moulage thermoplastique qui se caractérise par une meilleure stabilité dimensionnelle et une faible brillance. Cette composition, qui contient (A) un premier caoutchouc greffé ayant une granulométrie moyenne au poids comprise entre 0,05 et 0,30 microns, (B) un second caoutchouc greffé ayant une granulométrie moyenne au poids comprise entre 0,31 et 1,00 micron, (C) un (co)polymère de chlorure de vinyle et, éventuellement, (D) un copolymère styrène, est notamment appropriée pour extruder des profilés. Selon une réalisation préférée, au moins un des caoutchoucs greffés se caractérise en ce que son substrat se distingue par une structure âme-coque, l'âme contenant au moins un polymère vinylaromatique réticulé et la coque étant élastomère.

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