Styrene resin composition and process for producing the same

Details Styrene resin composition and process for producing the same Styrene resin composition and process for producing the same

C - Chemistry, Metallurgy

08

L

C08L 25/06 (2006.01) C08F 290/04 (2006.01)

Patent

CA 2474454

A styrene resin composition is provided which has a high molecular weight enabling a molded product obtained therefrom to have satisfactory strength, has a high melt mass-flow rate, high melt tension, and hence excellent moldability, and is less apt to gel during production, and a process for producing such a styrene resin composition. The styrene resin composition comprises a linear polystyrene having a weight average molecular weight of 200,000 to 350,000 and a multibranched polystyrene having a weight average molecular weight of 1,000,000 to 10,000.000, has an average molecular weight of 250,000 to 700,000, and a melt mass-flow rate (MFR) and melt tension (MT) which satisfy the following formulas (1) and (2) respectively: MFR >= 45 x exp(-0.1 x Mw x 10 -4) (1) MT >= 0.07Mw x 10 -4+ 1.8 (2).

L'invention concerne une composition de résine styrénique dont le poids moléculaire élevé permet d'obtenir un moulage ayant une résistance satisfaisante, qui a un indice de fluidité à chaud élevé, une tension de fusion élevée et, par conséquent, une excellente aptitude au moulage, et qui est moins exposée à la gélification lors de la production. Ladite composition comprend un polystyrène linéaire dont le poids moléculaire moyen en poids se situe entre 200 000 et 350 000, et un polystyrène à branches multiples dont le poids moléculaire moyen en poids se situe entre 1 000 000 et 10 000 000, et a un poids moléculaire moyen situé entre 250 000 et 700 000, un indice de fluidité à chaud (MFR) et une tension de fusion (MT) satisfaisant chacun aux relations suivantes (1) et (2): MFR >= 45 x exp(-0,1 x Mw x 10?-4¿) (1), MT >= 0,07Mw x 10?-4¿ + 1,8 (2)

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