Method for preparing improved polyalphamethyls tyrene-polydiorga

Details Method for preparing improved polyalphamethyls tyrene-polydiorga Method for preparing improved polyalphamethyls tyrene-polydiorga

1976-12-09

1978-08-15

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260886, 428447, C08L 8310

Patent

active

041072278

ABSTRACT:
Block copolymers are prepared by coupling a poly-.alpha.-methylstyrene block with a polydiorganosiloxane block through a small amount of coupling units of the formula ##STR1## where R denotes an alkyl radical of 1 to 4 carbon atoms. The resulting block copolymers have an improved glass transition temperature, reaching a value of approximately the glass transition temperature of an analogous poly-.alpha.-methylstyrene when R is tertiary-butyl.

REFERENCES:
patent: 3239579 (1966-03-01), Barber et al.
patent: 3665052 (1972-05-01), Saam et al.
patent: 3873636 (1975-03-01), Saam et al.

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