Purification process for aromatic dicarboxylic acids
    1.
    发明授权
    Purification process for aromatic dicarboxylic acids 失效
    芳香族二羧酸的纯化方法

    公开(公告)号:US5481033A

    公开(公告)日:1996-01-02

    申请号:US362334

    申请日:1994-12-22

    CPC classification number: C07C51/42 C07C51/487

    Abstract: Disclosed is a process for the purification of aromatic dicarboxylic acids in which the salt of an aliphatic diamine and an aromatic dicarboxylic acid is formed in an aqueous solvent, recrystallized, and contacted with an aliphatic dicarboxylic acid in an aqueous solvent such that the aromatic dicarboxylic acid is recoverable in the form of a purified precipitate. The remaining aqueous solute is a salt of the aliphatic diamine and aliphatic dicarboxylic acid and can be used as a starting material in the manufacture of certain polyamides (nylons). The invention is particularly applicable for purifying 2,6-naphthalene dicarboxylic acid, which is difficult otherwise to purify.

    Abstract translation: 公开了一种芳族二羧酸的纯化方法,其中脂族二胺和芳族二羧酸的盐在水性溶剂中形成,重结晶,并与脂族二羧酸在水性溶剂中接触,使得芳族二羧酸 可以以纯化的沉淀物的形式回收。 剩余的水溶质是脂族二胺和脂族二羧酸的盐,可用作制造某些聚酰胺(尼龙)的原料。 本发明特别适用于纯化难以净化的2,6-萘二甲酸。

    Liquid crystalline polyester resin
    2.
    发明授权
    Liquid crystalline polyester resin 失效
    液晶聚酯树脂

    公开(公告)号:US5466773A

    公开(公告)日:1995-11-14

    申请号:US396032

    申请日:1995-02-28

    CPC classification number: C08G63/605

    Abstract: Novel thermotropic liquid crystalline polyesters derived from t-butylhydroquinone, terephthalic acid, 2,6-naphthalene dicarboxylic acid and 4-hydroxybenzoic acid are described. These polymers are useful as molding resins.

    Abstract translation: 描述了衍生自叔丁基氢醌,对苯二甲酸,2,6-萘二甲酸和4-羟基苯甲酸的新型热致液晶聚酯。 这些聚合物可用作模制树脂。

    Thermotropic liquid crystalline polyester compositions
    6.
    发明授权
    Thermotropic liquid crystalline polyester compositions 失效
    热致液晶聚酯组合物

    公开(公告)号:US5250654A

    公开(公告)日:1993-10-05

    申请号:US878150

    申请日:1992-05-04

    CPC classification number: C08G63/605

    Abstract: This invention relates to thermotropic liquid crystalline polyester compositions containing recurring units derived from hydroquinone, 4,4'-dihydroxybiphenyl, terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-bibenzoic acid, and 4-hydroxybenzoic acid which are characterized as having melting points less than 365.degree. C., breaking elongations greater than or equal to 1.5%, and heat distortion temperatures greater than 200.degree. C.This invention further relates to the same compositions containing 20 to 40 weight percent of at least one glass reinforcing/filling agent and which are characterized as having melting points less than 365.degree. C., breaking elongations greater than or equal to 1.8%, and heat distortion temperatures greater than 230.degree. C.The compositions are useful as films, fibers, and shaped or molded articles.

    Abstract translation: 本发明涉及含有源自氢醌,4,4'-二羟基联苯,对苯二甲酸,2,6-萘二甲酸,4,4'-二苯甲酸和4-羟基苯甲酸的重复单元的热致液晶聚酯组合物,其特征在于 熔点低于365℃,断裂伸长率大于或等于1.5%,热变形温度大于200℃。本发明还涉及含有20-40重量%的至少一种玻璃增强剂的相同组合物 其特征在于具有小于365℃的熔点,断裂伸长率大于或等于1.8%,热变形温度大于230℃。该组合物可用作膜,纤维和成形或 模制品。

    Thermotropic liquid crystalline polyesters from 2-methylhydroquinone
    7.
    发明授权
    Thermotropic liquid crystalline polyesters from 2-methylhydroquinone 失效
    来自2-甲基泼尼松龙的热变性液晶聚酯

    公开(公告)号:US5115080A

    公开(公告)日:1992-05-19

    申请号:US602853

    申请日:1990-10-24

    CPC classification number: C08G63/191 C08G63/189 C09K19/3838

    Abstract: This invention relates to thermotropic liquid crystalline polyester compositions containing recurring units derived from 2-methylhydroquinone, terephthalic acid, 2,6-napthalenecarboxylic acid, and hydroquinone, characterized as having a heat distortion temperature of greater than 200.degree. C. and improved elongation. The inclusion of a reinforcing/filling agent selected from the group consisting of glass reinforcing agents, glass fillers, carbon metasilicate, calcium carbonate, talc, titanium dioxide, and calcined aluminum silicate in said compositions, and also in those same compositions lacking recurring units of hydroquinone, results in an improvement in the elongation of said compositions. The inclusion of carbon fiber into these compositions results in no significant decrease in the elongation of said compositions. The compositions are useful as films, fibers, and shaped articles.

    Thermotropic liquid crystalline polyester compositions
    8.
    发明授权
    Thermotropic liquid crystalline polyester compositions 失效
    热成型液晶聚合物组合物

    公开(公告)号:US5110896A

    公开(公告)日:1992-05-05

    申请号:US625132

    申请日:1990-12-10

    CPC classification number: C08G63/605 C09K19/3809

    Abstract: This invention relates to thermotropic liquid crystalline polyester compositions containing recurring units derived from hydroquinone, 4-4'-dihydroxybiphenyl, terephthalic acid, 2,6-naphthalenedicarboxylic acid, and 4-hydroxybenzoic acid which are characterized as having melting points less than 365.degree. C., breaking elongations greater than or equal to 1.5%, and heat distortion temperatures greater than 200.degree. C.This invention further relates to the same compositions containing 20 to 40 weight percent of at least one glass reinforcing/filling agent and which are characterized as having melting points less than 365.degree. C., breaking elongations greater than or equal to 2.0%, and heat distortion temperatures greater than 230.degree. C.The compositions are useful as films, fibers, and shaped or molded articles.

    Liquid crystalline polymer compositions
    9.
    发明授权
    Liquid crystalline polymer compositions 失效
    液晶聚合物组合物

    公开(公告)号:US5525700A

    公开(公告)日:1996-06-11

    申请号:US423520

    申请日:1995-04-17

    CPC classification number: C08J5/18 C08G63/605 C08J2367/04 Y10T428/31786

    Abstract: This invention relates to liquid crystalline polymers (LCPs) derived from (I) hydroquinone and/or 4,4'-biphenol and/or bis(4-hydroxylphenyl) ether, (II) terephthalic acid, (lII) 2,6-naphthalene dicarboxylic acid and/or 4,4'-bibenzoic acid, (IV) 4-hydroxybenzoic acid, (V) 6-hydroxy-2-naphthoic acid, and optionally (VI) an aliphatic diol in specified ratios. In addition to forming exceptionally tough films, the LCPs are useful as molding resins or for blending with other thermoplastic polymers.

    Abstract translation: 本发明涉及衍生自(I)氢醌和/或4,4'-联苯酚和/或双(4-羟基苯基)醚,(II)对苯二甲酸,(II)2,6-萘的液晶聚合物(LCP) (IV)4-羟基苯甲酸,(V)6-羟基-2-萘甲酸和任选的(Ⅵ)特定比例的脂族二醇。 除了形成非常坚韧的膜之外,LCP可用作模塑树脂或与其它热塑性聚合物共混。

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