Tapered block styrene/butadiene copolymers

Details Tapered block styrene/butadiene copolymers Tapered block styrene/butadiene copolymers

1991-02-06

1992-07-14

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, C08F29704

Patent

active

051303779

ABSTRACT:
A method for preparing tapered block copolymers in a polymerization process by charging an initiator and monomers sequentially with one or more charges of first one of the monomers, then with a mixture of the two monomers, and then with one or more charges of the second monomer alternating with one or more charges of the first monomer with subsequent coupling, to produce a polymodal tapered block copolymer. Suitable monomers include conjugated dienes and monovinylaromatic compounds. The copolymers are suitable for use in injection and blow molding equipment; the copolymers are particularly useful for shrink films, containers, tubes, fibers and other packaging applications.

REFERENCES:
patent: 4584346 (1986-04-01), Kitchen
patent: 4704434 (1987-11-01), Kitchen

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