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    • 94. 发明授权
    • Monovinylidene aromatic polymers with improved properties
    • 具有改进性能的单亚乙烯基芳族聚合物
    • US5264492A
    • 1993-11-23
    • US958669
    • 1992-10-08
    • Mehmet Demirors
    • Mehmet Demirors
    • C08F279/02C08L25/04C08L25/16
    • C08F279/02
    • There is disclosed a monovinylidene aromatic polymer resin having a specific rubber particle size distribution that provides surprisingly improved combinations of product properties, such as gloss, impact resistance and tensile strength. Such resin has a first group of smaller particles having a volume average particle diameter of from about 0.2 to about 0.6 micrometers and a second group of larger particles having a volume average particle diameter of from about 2.5 to about 5 micrometers. In these resins it is further necessary in this specific rubber particle size distribution, based on 100 parts by weight rubber or rubber equivalent, that (a) particles constituting from about 20 to about 60 parts by weight of the rubber have diameters of from about 0.1 to about 0.8 micrometers, (b) particles constituting from about 60 to about 20 parts by weight of the rubber have diameters of from about 2 to about 6 micrometers, and (c) that there be a specific amount of intermediate size particles constituting from about 10 to about 30 parts by weight of the rubber and having diameters between about 0.8 and about 2 micrometers.
    • 公开了具有特定橡胶粒度分布的单亚乙烯基芳族聚合物树脂,其提供令人惊奇地改进的产品性质的组合,例如光泽度,耐冲击性和拉伸强度。 这种树脂具有体积平均粒径为约0.2至约0.6微米的第一组较小颗粒和体积平均粒径为约2.5至约5微米的第二组较大颗粒。 在这些树脂中,基于100重量份的橡胶或橡胶当量,在该特定橡胶粒度分布中进一步需要:(a)构成约20至约60重量份橡胶的颗粒的直径为约0.1 至约0.8微米,(b)构成橡胶约60至约20重量份的颗粒的直径为约2至约6微米,(c)存在特定量的中等尺寸颗粒, 10至约30重量份的橡胶,其直径在约0.8至约2微米之间。
    • 95. 发明授权
    • Monovinylidene aromatic polymers with improved properties and a process
for their preparation
    • 具有改进性能的单甲苯基芳族聚合物及其制备方法
    • US5179166A
    • 1993-01-12
    • US580451
    • 1990-09-11
    • Mehmet Demirors
    • Mehmet Demirors
    • C08F279/00C08F279/02
    • C08F279/02
    • There is disclosed a monovinylidene aromatic polymer resin having a specific rubber particle size distribution that provides surprisingly improved combinations of product properties, such as gloss, impact resistance and tensile strength. Such resin has a first group of smaller particles having a volume average particle diameter of from about 0.2 to about 0.6 micrometers and a second group of larger particles having a volume average particle diameter of from about 2.5 to about 5 micrometers. In these resins it is further necessary in this specific rubber particle size distribution, based on 100 parts by weight rubber or rubber equivalent, that (a) particles constituting from about 20 to about 60 parts by weight of the rubber have diameters of from about 0.1 to about 0.8 micrometers, (b) particles constituting from about 60 to about 20 parts by weight of the rubber have diameters of from about 2 to about 6 micrometers, and (c) that there be a specific amount of intermediate size particles constituting from about 10 to about 30 parts by weight of the rubber and having diameters between about 0.8 and about 2 micrometers. Also disclosed is a process for preparing such resins in a simplified production process wherein the rubber which is used has distinct high and low molecular weight components, the high molecular weight component having a weight average molecular weight at least about two and one half times greater than the weight average molecular weight of the low molecular weight component.