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    • 83. 发明授权
    • Compatible three-component polymer alloys
    • 兼容的三组分聚合物合金
    • US3907929A
    • 1975-09-23
    • US46490174
    • 1974-04-29
    • GEN TIRE & RUBBER CO
    • DURST RICHARD R
    • C08L9/00C08L25/02C08L53/00C08L53/02C08L25/06C08L25/10
    • C08L25/02C08L9/00C08L53/00Y10S260/32Y10S525/931C08L53/02C08L2666/02
    • This invention comprises blends of otherwise relatively incompatible polymers, particularly polystyrene and polybutadiene in weight ratios of at least about 4:1, by the incorporation of graded styrene-butadiene AB block copolymers in which the weight ratio of total styrene to total butadiene in the A and B segments ranges from about 60:40 to about 35:65, preferably about 55:45 to about 35:65, the total styrene content in the blend, both as homopolymer and copolymer, being about 75 to 90 weight percent of the blend. In the blends of this invention the discontinuous phase, made up of the polybutadiene-type polymers and the graded block copolymers, is present in the form of particles of which at least 70 percent by weight, preferably 85 percent by weight or more, have particle diameters in the range of 0.2 to 5 microns as measured by the ''''Zeiss Particle Size Analyzer.
    • 本发明包括通过引入分级苯乙烯 - 丁二烯AB嵌段共聚物,其中相对不相容的聚合物,特别是聚苯乙烯和聚丁二烯的重量比为至少约4:1的共混物,其中A中的总苯乙烯与总丁二烯的重量比 和B片段的范围为约60:40至约35:65,优选约55:45至约35:65,共混物中作为均聚物和共聚物的总苯乙烯含量为共混物的约75至90重量% 。 在本发明的共混物中,由聚丁二烯型聚合物和分级嵌段共聚物组成的不连续相以至少70重量%,优选85重量%以上的颗粒的形式存在, 直径在0.2至5微米的范围内,由“Zeiss粒度分析仪测量”。