Oxidation of polyethylene
    1.
    发明授权
    Oxidation of polyethylene 失效
    聚乙烯的氧化

    公开(公告)号:US4889897A

    公开(公告)日:1989-12-26

    申请号:US206663

    申请日:1988-06-15

    CPC分类号: C08L27/06 C08F8/06 C08L23/30

    摘要: Oxidized polyethylenes useful as water-emulsifiable waxes and as lubricants in the extrusion of polyvinyl chloride are prepared by oxidizing finely divided polyethylene of high density at elevated temperatures with an oxidation gas of air and/or oxygen, the oxidation gas supplied per hour containing not less the 100 mg of ozone per kilogram of polyethylene, by performing the oxidiation in a paddle dryer and passing the oxidation gas into the free gas space above the polyethylene, the temperature in the paddly dryer preferably being continuously adjusted to from 1.degree. to 2.degree. C. below the softening point of the polyethylene.

    摘要翻译: 通过在空气和/或氧气的氧化气体下在高温下氧化高密度的细密聚乙烯制备用作水可乳化蜡和作为润滑剂的氧化性聚乙烯,其中挤出聚氯乙烯是每小时供给的氧化气体不少于 每千克聚乙烯100毫克臭氧,通过在桨式干燥器中进行氧化并使氧化气体进入聚乙烯上方的自由气体空间,桨式干燥器中的温度优选连续地调节至1℃至2℃ 低于聚乙烯的软化点。

    Oxidized polyethylene and use as lubricant for polyvinylchloride
    2.
    发明授权
    Oxidized polyethylene and use as lubricant for polyvinylchloride 失效
    氧化聚乙烯并用作聚氯乙烯的润滑剂

    公开(公告)号:US5064908A

    公开(公告)日:1991-11-12

    申请号:US608621

    申请日:1990-11-06

    CPC分类号: C08L27/06 C08F8/06 C08L23/30

    摘要: Oxidized polyethylenes useful as lubricants in the extrusion of polyvinyl chloride are prepared by oxidation of finely divided polyethylene of high density at elevated temperatures with an oxidation gas of air and/or oxygen, the polyethylene used containing from 0.015 to 0.5% by weight of a free radical former organic compound in admixture and being contacted per hour with an oxidation gas which per kilogram of polyethylene contains from 30 to 600, in particular from 80 to 300, mg of ozone, with or without a reduced pressure treatment at elevated temperatures after the oxidation.

    摘要翻译: 在聚氯乙烯挤出中可用作润滑剂的氧化聚乙烯通过在高温下用空气和/或氧气的氧化气体氧化高密度的细碎聚乙烯制备,所用聚乙烯含有0.015-0.5重量%的游离 基础前体的有机化合物混合并每小时与氧化气体接触,氧化气体每千克聚乙烯含有30至600,特别是80至300毫克臭氧,在氧化后在升高的温度下进行或不进行减压处理 。

    Stabilizers
    4.
    发明授权
    Stabilizers 失效
    稳定剂

    公开(公告)号:US4680327A

    公开(公告)日:1987-07-14

    申请号:US823744

    申请日:1986-01-29

    CPC分类号: C08K5/1545 C08K5/103

    摘要: Stabilizers consisting of (a) 2,5,7,8-tetramethyl-2-(2'-stearyloxyethyl)-chroman and (b) glyceryl stearate, glyceryl hydroxystearate, partial esters of stearic acid with condensates of glycerol and trimethylolpropane, triglyceryl stearate and/or tetraglyceryl stearate, with or without further conventional additives, the weight ratio of (a) to (b) being from 10:1 to 1:10, give improved stabilization to discoloration and superior stability during processing when used in plastics such as polyethylene or polypropylene.

    摘要翻译: 稳定剂由(a)2,5,7,8-四甲基-2-(2'-硬脂酰氧基乙基) - 苯并二氢吡喃和(b)硬脂酸甘油酯,羟基硬脂酸甘油酯,硬脂酸与甘油和三羟甲基丙烷缩合物的偏酯,硬脂酸甘油三酯 和/或四甘油硬脂酸酯,使用或不含其它常规添加剂时,(a)至(b)的重量比为10:1至1:10,当在塑料中使用时,提供改进的变色稳定性和加工过程中优异的稳定性 聚乙烯或聚丙烯。