Process for producing amorphous syndiotactic polystyrene

Details Process for producing amorphous syndiotactic polystyrene Process for producing amorphous syndiotactic polystyrene

1993-08-19

1995-08-29

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526131, 526346, 526902, 526912, 2643281, 26433117, C08F 4643, C08F 1208

Patent

active

054461170

ABSTRACT:
High molecular weight syndiotactic polystyrene having greater than 96% syndiotacticity can be produced in very high yield (greater than 92%) by polymerizing styrene monomer, under rigorously anhydrous conditions, with a catalyst comprising Cp*M(CH.sub.3).sub.3, where Cp* is a single .eta..sup.5 -cyclopentadienyl or an .eta..sup.5 -cyclopentadienyl group optionally covalently bonded to M through a substituent, and M is selected from Ti, Zr, Hf and a co-catalyst comprising B(C.sub.6 F.sub.5).sub.3 dissolved in an aromatic solvent such as toluene or styrene, at carefully controlled temperatures in the range -15.degree. C. to +50.degree. C. The rapid rate of polymerization and high yield make the production of hard, rigid products by reaction injection moulding possible.

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