C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2001, 400/30
C08F 283/10 (2006.01) A01C 1/00 (2006.01) C08G 81/00 (2006.01) C08G 81/02 (2006.01)
Patent
CA 1043039
ABSTRACT OF THE DISCLOSURE This invention relates to thermoplastic, multiphase copolymers represented by graft copolymers having the general formula Image or block copolymers having the general for- mula xB-[AB]n -yA wherein n is an integer ? 1, m is > 1, x and y are 0 or 1, and y is 1 when n is 1, A is a thermoplas- tic, hydrophobic polymer block and B is a thermoplastic, hydrophilic polymer block,both blocks A & B having softening points of at least about 35°C,and which comprises from about 30 - 97 wt. % of said copolymer. The novel polymers of this invention are useful for making water containing gels. The novel polymers are made by a process which allows one to prepare a copolymer which is substantially free of homopolymeric impurities. The compositionsof the instant invention are melt processable by conventional thermoplastic techniques and can be used to make films or be compression or injection molded. Films for example find utility in agricultural applications as water retention agents for seed germination.
190301
Lundberg Robert D.
Thame Neville G.
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