Polybenzazole and fiber thereof
    3.
    发明授权
    Polybenzazole and fiber thereof 失效
    聚吲唑及其纤维

    公开(公告)号:US06335419B2

    公开(公告)日:2002-01-01

    申请号:US09731394

    申请日:2000-12-05

    CPC classification number: C08G75/32 C08G73/18 C08G73/22 D01F6/74

    Abstract: A polybenzazoleolybenzazole having a residual content of a BB-PBZ monomer of not more than 0.010 wt %, which is obtained by dehydration polymerization condensation of an AA-PBZ monomer of the formula (I) wherein Ar is a quadrivalent aromatic organic residue and X is O, S or NH, and a BB-PBZ monomer of the formula (II) W—Z—W  (II) wherein Z is an optionally substituted divalent aromatic organic residue and W is a carboxyl group or a group derived from the carboxyl group, which is reactive with —XH in the AA-PBZ monomer. Because the residual content of the BB-PBZ monomer in polybenzazole is not more than 0.010 wt %, a polybenzazole fiber having a small filament denier can be produced stably at a high speed without suffering from thread breakage during the production.

    Abstract translation: 通过其中Ar是四价芳族有机残基的式(I)的AA-PBZ单体和X是通过其脱水聚合缩合获得的具有不大于0.010重量%的BB-PBZ单体的残留含量的聚苯并唑聚吲哚 O,S或NH,和式(II)的BB-PBZ单体,其中Z是任选取代的二价芳族有机残基,W是羧基或衍生自羧基的基团,其与-XH的反应性 AA-PBZ单体。 由于聚吲哚中的BB-PBZ单体的残留量不大于0.010重量%,所以可以高速稳定地制造具有小丝旦数的聚吲哚纤维,而在生产过程中不会发生断线。

    Method of stabilizing 4,6-diaminoresorcinol and salt thereof
    4.
    发明授权
    Method of stabilizing 4,6-diaminoresorcinol and salt thereof 失效
    稳定4,6-二氨基间苯二酚及其盐的方法

    公开(公告)号:US5911908A

    公开(公告)日:1999-06-15

    申请号:US95366

    申请日:1998-06-10

    CPC classification number: C08G73/22 C07C213/10

    Abstract: A method for stabilizing DAR during storage, comprising storing DAR in the presence of a reducing agent having a standard redox potential of not less than -0.20 volt and not more than 0.34 volt, in a proportion of not less than 100 ppm and not more than 10,000 ppm of DAR. The present invention improves storage stability of DAR. This in turn results in easy handling and long-term preservation of DAR. Thus, a high quality polymer PBO can be easily produced and the invention greatly contributes to the industrial field.

    Abstract translation: 一种用于在储存期间稳定DAR的方法,包括在具有不低于100ppm且不大于0.34V的比例的标准氧化还原电位不低于-0.20V且不大于0.34伏的存在下存储DAR 10,000 ppm的DAR。 本发明提高了DAR的储存稳定性。 这反过来导致DAR的易于处理和长期保存。 因此,可以容易地制造高质量的聚合物PBO,并且本发明对工业领域有很大的贡献。

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