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

1977-01-11

1978-08-08

Bagwill, Robert E.

Plant husbandry

Process

260857G, 47 56, 47DIG10, A01C 104

Patent

active

041048245

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 cyrstalline 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: 3336129 (1967-08-01), Herrett et al.
patent: 3705467 (1972-12-01), McKnight
patent: 3798838 (1974-03-01), Hashimoto et al.
patent: 3847641 (1974-11-01), Cushman et al.
patent: 3973355 (1976-08-01), McKenzie
patent: 4045387 (1977-08-01), Fanta et al.

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