Block copolymers of monovinylarenes and conjugated dienes contai

Details Block copolymers of monovinylarenes and conjugated dienes contai Block copolymers of monovinylarenes and conjugated dienes contai

1993-12-02

1995-03-21

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, 525 89, C08F29704

Patent

active

053996283

ABSTRACT:
A method for preparing tapered block copolymers in a polymerization process by sequentially charging: (1) an initiator and monovinylaromatic monomer in the presence of a randomizer; (2) an initiator and monovinylaromatic monomer; (3) a mixture of monovinylaromatic and conjugated diene monomers; (4) a mixture of monovinylaromatic and conjugated diene monomers; (5) conjugated diene monomer; and (6) a coupling agent; and the polymodal tapered block copolymers prepared thereby. The copolymers are particularly useful neat or in blends for applications such as packaging and food or drink containers which require transparency and good environmental stress crack resistance.

REFERENCES:
patent: 4704434 (1987-11-01), Kitchen et al.
patent: 5130377 (1992-07-01), Trepka et al.
patent: 5227419 (1993-07-01), Moczygemba et al.
patent: 5256736 (1993-10-01), Trepka et al.
patent: 5290875 (1994-03-01), Moczygemba et al.
patent: 5319033 (1994-06-01), Trepka et al.

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