C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/3056
C08L 27/06 (2006.01) C08F 279/02 (2006.01) C08F 285/00 (2006.01) C08L 51/00 (2006.01)
Patent
CA 1305571
ABSTRACT OF THE DISCLOSURE: A polyvinyl chloride resin composition comprises 3 - 30 wt.% of a graft copolymer and 97 - 70 wt.% of a polyvinyl chloride resin and has highly-balanced properties between impact resistance, transparency and stress-whitening resistance and excellent processing characteristics. The graft copolymer is obtained by graft-polymerizing, in the presence of a latex containing greater than 75 but not exceeding 85 parts by weight of a rubbery butadiene-styrene copolymer formed of 65 - 85 wt.% of butadiene, 15 - 35 wt.% of styrene and 0 - 3 wt.% of crosslinkable monomer, (i) 5 - 24 parts by weight of a first monomer mixture as a first-stage component aid first monomer mixture being composed of 70 - 97 wt.% of methyl methacrylate and 30 - 3 wt.% of an alkyl acrylate whose alkyl group has 1 - 8 carbon atoms; and then (ii) 3 - 21 parts by weight of a second monomer mixture as a second-stage component, said second monomer mixture being composed of 97 - 100 wt.% of styrene and 0 - 3 wt.% of crosslinkable monomer. The sum of the first and second monomer mixtures and the rubbery butadiene-styrene copolymer is 100 parts by weight. The monomers grafted in the first stage amount to 30 - 80 wt.% of the sum of the grafted monomers.
558608
Hoshino Mitsuru
Suzuki Katsumi
Yusa Haruhiko
Kirby Eades Gale Baker
Kureha Kagaku Kogyo K.k.
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