Block copolymers for a sheet or film

Details Block copolymers for a sheet or film Block copolymers for a sheet or film

1973-12-10

1976-02-17

Schoter, Joseph L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260879, 260 837, 260 80P, C08F23600, C08F 446

Patent

active

039392244

ABSTRACT:
First polymerization of a mixture of styrene-type monomers and conjugated diene monomers containing 30 to 70% by weight of styrene-type monomers is carried out, and when 40 or more of the diene monomers have been converted to a copolymer, there are then added styrene-type monomers in such an amount that the content of styrene units accounts for a proportion of 70 to 85% by weight of the finally obtained block copolymers, followed by completion of the polymerization. Alternatively, when all the diene monomers added have been converted to the copolymer, the second polymerization of styrene type monomers is carried out in the presence of a small amount of conjugated dienes as a polymerization retardant. Block copolymers obtained thus are useful for sheet or film molding having good low-temperature impact strength.

REFERENCES:
patent: 3149182 (1957-10-01), Porter
patent: 3287333 (1961-12-01), Zelinski
patent: 3703567 (1972-11-01), Sutter
"Preparation of Block Copolymers," Robert P. Zelinski, U.S. application (abandoned) No. 721,293.
"On the Graft-and Block Copolymers from Synthetic and Natural Macromolecules" by E. H. Immergut and H. Mark, Makromolekulare Chemie 18-21, 322-341 (1956).

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