C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/3035
C08F 279/00 (2006.01) C08F 279/02 (2006.01) C08F 285/00 (2006.01)
Patent
CA 1041245
Disclosed herein is a two-stage graft polymerization process for producing a grafted rubber which can be used to prepare high nitrile polyblends with good impact properties, good optical properites, low water vapor transmission and low oxygen permeability, forming an admixture of a particular butadiene-styrene rubbery substrate and a first polymerizable monomer composition comprising a difunctional monomer, an ethylenically unsaturated nitrile, a monovinylidene aromatic hydrocaxbon and an alkyl ester of acrylic or methacrylic acid; the composition is subjected to polymerization conditions to effect polymerization of the monomer formulation and grafting of a substantial portion of the polymer being produced onto the particular butadiene-styrene rubbery substrate; the re- sultant graft copolymer has a superstrate to substrate ratio of at least 10:100 and is thereafter admixed with a second poly- merizable monomer composition consisting of at least 55 percent by weight of an ethylenically unsaturated nitrile monomer; the second monomer composition is subjected to polymerization con- ditions to effect polymerization of the monomers thereof and to produce grafting of a substantial portion of the polymer being produced onto the graft copolymer to form a composite graft copolymer.
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