Multiphase block and graft copolymers comprising a hydrophilic c

Details Multiphase block and graft copolymers comprising a hydrophilic c Multiphase block and graft copolymers comprising a hydrophilic c

1975-02-27

1977-11-08

Michl, Paul R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

47 58, 260857PG, 260857PE, 260885, 260886, C08L 5300

Patent

active

040575985

ABSTRACT:
This invention relates to thermoplastic, multiphase copolymers selected from the group consisting of copolymers represented by graft copolymers having the general formula ##STR1## AND BLOCK COPOLYMERS HAVING THE GENERAL FORMULA XB--[AB].sub.n --yA wherein n is an integer .gtoreq.1, m is >1, x and y are 0 or 1, and y is 1 when n is 1, A is a thermoplastic, hydrophobic polymer block having a softening point (i.e., a glass transition or crystalline melting point) of at least 35.degree. C and a molecular weight of at least 2,000, and B is a thermoplastic, hydrophilic polymer block having a softening point of at least about 35.degree. C and a molecular weight of at least about 6,000, which comprises from about 30-97 wt % of said copolymer. The novel polymers of this invention are useful for making water containing gels. Preferably, the thermoplastic multiphase copolymer is a styrene-ethylene oxide copolymer. The novel polymers are made by a process which allows one to prepare a copolymer which is substantially free of homopolymeric impurities. The compositions of the instant invention are melt processable by conventional thermoplastic techniques.

REFERENCES:
patent: 2808388 (1957-10-01), Hellman
patent: 2848434 (1958-08-01), Hellman
patent: 2921920 (1960-01-01), Smith
patent: 3157527 (1964-11-01), Fournet
patent: 3384681 (1968-05-01), Kobayashi
patent: 3549724 (1970-12-01), Okazaki
patent: 3639524 (1972-02-01), Seiderman
patent: 3700630 (1972-10-01), Hamada
patent: 3767731 (1973-10-01), Seiderman
patent: 3776983 (1973-12-01), Iovine
patent: 3800006 (1974-03-01), Katayama
patent: 3862263 (1975-01-01), Maruta

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