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

2006-05-23

2006-05-23

Mullis, Jeffrey (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S241000

Reexamination Certificate

active

07049369

ABSTRACT:
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:in-line-formulae description="In-line Formulae" end="lead"?MFR≧45×exp(−0.1×Mw×10−4)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?MT≧0.07Mw×10−4+1.8.  (2)in-line-formulae description="In-line Formulae" end="tail"?

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