Blends of copolymers of monovinylarenes and conjugated dienes co

Details Blends of copolymers of monovinylarenes and conjugated dienes co Blends of copolymers of monovinylarenes and conjugated dienes co

1995-12-28

1996-12-24

Zemel, Irina S.

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

Synthetic resins

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

525271, 525314, 525316, C08F29704, C08L 2504, C08L 5302

Patent

active

055874258

ABSTRACT:
A method for preparing blends of a copolymer 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 conjuated 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
patent: 4925899 (1990-05-01), Rendina
patent: 5130377 (1992-07-01), Trepka
patent: 5227419 (1993-07-01), Moczygemba
patent: 5290875 (1994-03-01), Moczygemba
patent: 5319033 (1994-06-01), Trepka
patent: 5393838 (1995-02-01), Moczygemba

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