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

1993-12-06

1995-02-28

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...

525314, C08L 5302, C08L 2504, C08F29704

Patent

active

053938380

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 and blends thereof are particularly useful for packaging applications which require good environmental stress crack resistance.

REFERENCES:
patent: 4390663 (1983-06-01), Nicholson
patent: 4925899 (1990-05-01), Rendina et al.
patent: 5130377 (1992-07-01), Trepka
patent: 5227419 (1993-07-01), Moczygemba et al.
patent: 5256736 (1993-10-01), Trepka et al.

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