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    • 94. 发明授权
    • Hydraulic damper
    • 液压减震器
    • US5480011A
    • 1996-01-02
    • US128987
    • 1993-09-29
    • Osamu NagaiKunihide OkamotoKaoru Yamamoto
    • Osamu NagaiKunihide OkamotoKaoru Yamamoto
    • F16F9/46
    • F16F9/461F16F9/46B60G2500/10
    • A hydraulic damper has a first oil chamber, a second oil chamber, a communication mechanism defining a communication oil passage, the first and second oil chambers communicating with each other through the communication oil passage, and a damping force adjusting mechanism for varying a cross-sectional area of the communication oil passage to adjust damping forces. The damping force adjusting mechanism includes an adjusting rod having an end disposed in a portion of the communication oil passage, the adjusting rod being movable toward and away from the communication oil passage to vary the cross-sectional area of the communication oil passage, an eccentric cam rotatably disposed in engagement with an opposite end of the adjusting rod, and a rotary actuator for rotating the eccentric cam to move the adjusting rod toward and away from the communication oil passage to adjust the damping forces.
    • 液压阻尼器具有第一油室,第二油室,限定连通油通道的连通机构,所述第一和第二油室通过所述连通油路相互连通;以及阻尼力调节机构, 连通油路的截面积调节阻尼力。 阻尼力调节机构包括:调节杆,其具有设置在连通油路的一部分中的端部,调节杆可朝向和远离连通油通道移动以改变连通油路的横截面面积,偏心 可旋转地设置成与调节杆的相对端接合的凸轮;以及用于旋转偏心凸轮以使调节杆朝向和远离连通油路移动以调节阻尼力的旋转致动器。
    • 96. 发明授权
    • Process for producing polyoxymethylene copolymer having reduced amount
of unstable terminal groups
    • 具有减少量的不稳定末端基团的聚甲醛共聚物的制备方法
    • US5344911A
    • 1994-09-06
    • US26130
    • 1993-03-05
    • Kaoru YamamotoNagayoshi MaedaMakoto KamiyaToshiro MuraoGerhard ReuschelDietrich Fleischer
    • Kaoru YamamotoNagayoshi MaedaMakoto KamiyaToshiro MuraoGerhard ReuschelDietrich Fleischer
    • C08G2/10C08G2/28C08G4/00C08G6/00
    • C08G2/28C08G2/10
    • Processes for producing a polyoxymethylene copolymer includes forming a crude polyoxymethylene copolymer by subjecting a reaction system containing trioxane, a cyclic ether or cyclic formal comonomer, and a catalyst (e.g., boron trifluoride or a coordination compound thereof) to copolymerization reaction conditions. During copolymerization, both the total content of impurities and catalyst in the copolymerization reaction system are adjusted. In this regard, the impurities content (i.e., those compounds which form unstable end groups in the polyoxymethylene copolymer and/or those compounds having a chain-terminating or chain-transfer function) in the copolymerization reaction system is adjusted to 1.times.10.sup.-2 mole percent or less based on the total monomer amount, while the the content of the catalyst in the copolymerization reaction system to between 1.times.10.sup.-3 to 1.times.10.sup.-2 mole percent based on the total monomer amount. Immediately after copolymerization has been completed, the crude polyoxymethylene copolymer is quenched to a temperature of 45.degree. C. or less within 30 seconds after completion of copolymerization. Quenching of the crude polyoxymethylene copolymer is preferably simultaneously accompanied by deactivation of the catalyst by bringing the crude polyoxymethylene copolymer immediately following completion of copolymerization into contact with a cold liquid which contains a catalyst deactivator.
    • 用于制备聚甲醛共聚物的方法包括通过使含有三恶烷,环醚或环状形式共聚单体的反应体系和催化剂(例如三氟化硼或其配位化合物)进行共聚反应条件来形成粗聚甲醛共聚物。 在共聚过程中,调节共聚反应体系中杂质和催化剂的总含量。 在这方面,将共聚反应体系中的杂质含量(即,在聚甲醛共聚物中形成不稳定端基的那些化合物和/或具有链终止或链转移功能的那些化合物)调节至1×10 -2摩尔% 或更少,而共聚反应体系中催化剂的含量相对于总单体量为1×10 -3〜1×10 -2摩尔%。 共聚完成后立即将聚甲醛共聚物在共聚完成后30秒钟内淬火至45℃以下。 粗聚甲醛共聚物的淬火优选同时伴随着催化剂的失活,使粗聚甲醛共聚物在完成共聚后立即与含有催化剂失活剂的冷液接触。
    • 97. 发明授权
    • Process for preparing cyclic polyoxymethylene
    • 制备环状聚甲基乙烯的方法
    • US5248762A
    • 1993-09-28
    • US844583
    • 1992-03-30
    • Kaoru YamamotoToshio Shiwaku
    • Kaoru YamamotoToshio Shiwaku
    • C08G2/28C08G2/30C08G2/36
    • C08G2/28C08G2/36
    • Cyclic polyoxymethylene having a number-average molecular weight of 500 to 5,000 is obtained by solid state cyclization reaction of an alkalidegradative linear oxymethylene homopolymer in the presence of a medium containing a cationic catalyst.The cyclization is effected at 10.degree. to 150.degree. C. for 1 to 500 minutes in an organic liquid medium.The reaction mixture obtained by the cyclization is treated with an alkaline medium to hydrolyze and remove away unreacted linear polyoxymethylene homopolymer, and isolate the cyclic polyoxymethylene.The product has a sharp molecular weight distribution and is useful as a resin improver.
    • PCT No.PCT / JP91 / 01089第 371日期:1992年3月30日 102(e)1992年3月30日PCT PCT 1991年8月15日PCT公布。 出版物WO92 / 03487 日本1993年3月5日。数均分子量为500〜5000的环氧聚甲醛是通过碱处理线性甲醛均聚物在含有阳离子催化剂的介质存在下的固相环化反应得到的。 在有机液体介质中,在10℃至150℃下进行1至500分钟的环化。 通过环化得到的反应混合物用碱性介质处理以水解和除去未反应的线性聚甲醛均聚物,并分离出环状聚甲醛。 该产品具有尖锐的分子量分布,可用作树脂改良剂。