Document Type and Number:
Japanese Patent JPS4121994
Kind Code:
B1
Abstract:
A grafted vinyl alcohol-olefin copolymer is prepared by irradiating a particulate or pulverulent vinyl alcohol-olefin copolymer with ionizing radiation and contacting the irradiated copolymer with (a) a conjugated diene or derivative thereof either alone or mixed with a vinyl or vinylidene monomer or (b) a solution containing the said diene or monomer mixture, in conditions in which the copolymer is slightly swelled and graft polymerization is effected but the particles of resin do not lose their particulate pulverulent form. The vinyl alcohol-olefin copolymer may be produced by partial or complete saponification of a vinyl ester-olefin copolymer. Suitable dienes are butadiene, isoprene and chloroprene. Specified diene comonomers are styrene, acrylonitrile and methyl methacrylate. The grafting may be carried out in an atmosphere of graft monomer vapour. In examples, vinyl alcohol-olefin copolymers with a degree of saponification of less than 100% are irradiated with an electron beam and contacted with graft monomers, in some cases in solution in methanol. The vinyl alcohol-olefin copolymer and monomer or monomers are as follows: (1)-vinyl alcohol/ethylene copolymer, butadiene and acrylonitrile, (2)-vinyl alcohol/ethylene copolymer and butadiene, (3)-vinyl alcohol/ethylene copolymer, butadiene and styrene, (4)-vinyl alcohol/propylene copolymer and butadiene, (5)-vinyl alcohol/propylene copolymer, butadiene and acrylonitrile and (6)-vinyl alcohol/butylene copolymer and butadiene. The graft polymers may be blended with ungrafted vinyl alcohol-olefin copolymer and/or a polymer of the graft monomer or monomers.
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Application Number:
JP1435764A
Publication Date:
December 22, 1966
Filing Date:
March 16, 1964
Export Citation:
International Classes:
C08F261/04