Conjugated diene/monovinylarene block copolymers with multiple t

Details Conjugated diene/monovinylarene block copolymers with multiple t Conjugated diene/monovinylarene block copolymers with multiple t

1992-11-30

1994-03-01

Seidleck, James J.

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

Synthetic resins

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

525250, 525271, 525256, 525258, 525259, 525261, C08F29704

Patent

active

052908755

ABSTRACT:
A method for preparing polymodal tapered block copolymers in a polymerization process by sequentially charging: (a) an initiator and monovinylaromatic monomers in the presence of a randomizer; (b) an initiator and monovinylaromatic monomers; (c) a mixture of monovinylaromatic and conjugated diene monomers; (d) a mixture of monovinylaromatic and conjugated diene monomers; (e) an initiator and monovinylaromatic monomers; (f) a mixture of monovinylaromatic and conjugated diene monomers; (g) a mixture of monovinylaromatic and conjugated diene monomers; (h) conjugated diene monomers; and (i) a coupling agent. The copolymers are particularly useful for packaging applications which require good environmental stress crack resistance.

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