High melt index thermoplastic elastomer and preparation method therefor

    公开(公告)号:US12043686B2

    公开(公告)日:2024-07-23

    申请号:US17055994

    申请日:2019-05-10

    CPC classification number: C08F293/005 C08F2438/03

    Abstract: Disclosed are a high melt index thermoplastic elastomer and a preparation method therefor. In the present invention, an emulsion polymerization system and a reversible addition chain transfer free radical polymerization technique are used, and a thermoplastic elastomer having a block structure with a high melt index is obtained by means of controlling reaction temperatures of different stages. The present invention is simple in terms of workflow and equipment and energy-saving and environmentally friendly in terms of process, and the raw materials thereof are cheap and easy to obtain, and the resulting high melt index thermoplastic elastomer has an excellent hot workability.

    Low-power fractional-N phase-locked loop circuit

    公开(公告)号:US11936390B2

    公开(公告)日:2024-03-19

    申请号:US17973518

    申请日:2022-10-25

    CPC classification number: H03L7/091 H03L7/0995 H03L7/103

    Abstract: Disclosed is a low-power fractional-N phase-locked loop circuit, which comprises a phase detector, a voltage-to-current converter, a loop filter, a voltage-controlled oscillator, a frequency divider and a digital logic processor; the phase detector, the voltage-to-current converter, the loop filter, the voltage-controlled oscillator and the frequency divider are connected in sequence; a reference signal is input from the phase detector, the phase detector detects the phases of the reference signal and a feedback signal with a quantization error output by the frequency divider, compensates a quantization phase error generated by fractional frequency division, and outputs a compensated phase detection result to the voltage-to-current converter; the quantization error generated by fractional frequency division is converted into a voltage domain through a digital domain or directly coupled to a phase error signal in the phase detector to complete the compensation of the quantization error.

    Poly((meth)acrylic acid-b-styrene-b-butadiene-b-styrene) block copolymer latex and method for preparing the same
    18.
    发明授权
    Poly((meth)acrylic acid-b-styrene-b-butadiene-b-styrene) block copolymer latex and method for preparing the same 有权
    聚((甲基)丙烯酸-b-苯乙烯-b-丁二烯-b-苯乙烯)嵌段共聚物胶乳及其制备方法

    公开(公告)号:US09328234B2

    公开(公告)日:2016-05-03

    申请号:US14203379

    申请日:2014-03-10

    Abstract: The present invention discloses a poly((meth)acrylic acid-b-styrene-b-butadiene-b-styrene) block copolymer latex and a method for preparing the same. The poly((meth)acrylic acid-b-styrene-b-butadiene-b-styrene) block copolymer latex is directly and stably obtained by emulsion polymerization in the presence of an amphiphilic macromolecule reversible addition fragmentation chain transfer agent as both chain transfer agent and reactive emulsifier. The present invention has simple operation, and the process is environmentally friendly and energy-saving, the product poly ((meth) acrylic acid-b-styrene-b-butadiene-b-styrene) block copolymer latex has a good prospect in many fields, such as bitumen modification, adhesives, polymer toughening and the like.

    Abstract translation: 本发明公开了一种聚((甲基)丙烯酸-b-苯乙烯-b-丁二烯-b-苯乙烯)嵌段共聚物胶乳及其制备方法。 聚((甲基)丙烯酸-b-苯乙烯-b-丁二烯-b-苯乙烯)嵌段共聚物胶乳通过乳液聚合在两亲性大分子可逆加成断裂链转移剂作为链转移剂的存在下直接稳定地得到 和反应性乳化剂。 本发明操作简单,工艺环保节能,产品聚((甲基)丙烯酸-b-苯乙烯-b-丁二烯-b-苯乙烯)嵌段共聚物胶乳在许多领域具有良好的前景 ,例如沥青改性,粘合剂,聚合物增韧等。

    BLOCK COPOLYMER COMPRISING A BLOCK WITH GLASS TRANSITION TEMPERATURE HIGHER THAN 100°C AND METHOD FOR PREPARING THE SAME
    19.
    发明申请
    BLOCK COPOLYMER COMPRISING A BLOCK WITH GLASS TRANSITION TEMPERATURE HIGHER THAN 100°C AND METHOD FOR PREPARING THE SAME 有权
    包含玻璃态转变温度高于100℃的块状嵌段共聚物及其制备方法

    公开(公告)号:US20150126667A1

    公开(公告)日:2015-05-07

    申请号:US14594104

    申请日:2015-01-10

    CPC classification number: C08F293/00 C08F2/10 C08F2/24

    Abstract: The present invention discloses a block copolymer comprising a block with glass transition temperature higher than 100° C. and a method for preparing the same. In the method, latex of a block copolymer is prepared by taking n-butyl acrylate as a soft block, random copolymer of styrene and γ-methyl-α-methylene-γ-butyrolactone as a hard block, utilizing emulsion polymerization system and reversible addition fragmentation chain transfer radical polymerization technology. The method utilizes an amphiphilic macromolecule reversible addition fragmentation chain transfer agent has dual function of both chain transfer agent and emulsifier, thus can achieve good control of monomer polymerization and avoid the use of traditional emulsifier; the reaction has no polymerization inhibition period, has fast reaction rate and high final conversion; colloidal particles can stably grow; product has a hard block with glass transition temperature up to 155° C., and thus has a good application prospect in the field of high heat resistance thermoplastic elastomer.

    Abstract translation: 本发明公开了包含玻璃化转变温度高于100℃的嵌段的嵌段共聚物及其制备方法。 在该方法中,通过以丙烯酸正丁酯作为软嵌段,使用苯乙烯和γ-甲基-α-亚甲基-γ-丁内酯的无规共聚物作为硬嵌段,利用乳液聚合体系和可逆加成来制备嵌段共聚物的胶乳 断裂链转移自由基聚合技术。 该方法利用两亲性高分子可逆加成断裂链转移剂具有链转移剂和乳化剂的双重功能,可以实现单体聚合的良好控制,避免使用传统乳化剂; 反应没有聚合抑制期,反应速度快,最终转化率高; 胶体粒子能稳定生长; 产品具有玻璃化转变温度高达155℃的硬块,因此在高耐热性热塑性弹性体领域具有良好的应用前景。

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