Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-02-11
1989-08-15
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 83, 525 84, 525 85, C08L 2706, C08L 5104
Patent
active
048575925
ABSTRACT:
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, said 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.
REFERENCES:
patent: 4624987 (1986-11-01), Hosoi et al.
Hoshino Mitsuru
Suzuki Katsumi
Yusa Haruhiko
Jacobs Lewis T.
Kureha Kagaku Kogyo K. K.
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