Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1993-03-19
1995-12-05
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 88, 525 89, 525 98, 525 99, 525316, 525902, C08L 5104, C08L 5302
Patent
active
054730147
ABSTRACT:
A rubber modified styrenic resin composition which can be obtained by dispersing rubber-like polymer particles in a homopolymer or a copolymer of a styrenic monomer. The rubber modified styrenic resin composition has:
(a) a volume-average particle size of the rubber-like polymer particles is in the range of from 0.2 to 0.8 .mu.m,
(b) a particle size distribution curve on the basis of the volume of the rubber-like polymer particles has one peak,
(c) a ratio of a 5% value to a 95% value of the cumulative distribution of the particle size on the basis of the volume of the rubber-like polymer particles is in the range of from 3 to 45.
The rubber-like polymer particles comprise (i) a styrene-butadiene block copolymer (I), and (ii)(1) a styrene-butadiene block copolymer (II), (2) a polybutadiene (III), or (3) a styrene-butadiene block copolymer (IV) and polybutadiene (V), wherein (I) contains 25-50 % styrene, (II) and (IV) contain 5-20% styrene, the weight ratio of: (I)/(II), (I)/(III) and (I)/(IV) is from 95/5 to 40/60 and {(I)+(IV)}/(V) is from 99/1 to 70/30 and (I) to (V) are of specified styrene solution viscosity.
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patent: 4839418 (1989-06-01), Schwaban et al.
patent: 5180780 (1993-01-01), Nakamura et al.
patent: 5210132 (1993-05-01), Matsubara et al.
Ando Toshihiko
Ichikawa Kouzou
Iwamoto Mune
Kaneko Masahiro
Nakajima Akihiko
Mitsui Toatsu Chemicals Incorporated
Seidleck James J.
Warzel M. L.
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