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    • 2. 发明授权
    • Polyoxymethylene with improved acid stability, process for production
and use thereof
    • 具有改善的酸稳定性的聚甲醛,其制备方法和用途
    • US5693709A
    • 1997-12-02
    • US701800
    • 1996-08-26
    • Edwin NunStephanie SchauhoffDetlef Arnoldi
    • Edwin NunStephanie SchauhoffDetlef Arnoldi
    • C08L59/00C08L71/00C08L75/04C08K5/05
    • C08L59/00C08L71/00C08L75/04
    • Polyoxymethylene with improved acid stability, process for production and use thereof. By adding 0.01 to 5 parts of an alkali metal salt of a polybasic acid, for example oxalic acid, citric acid and/or 0.01 to 5 parts of a polyalkylene glycol, for example polyethylene glycol and/or 0.1 to 100 parts of a thermoplastic polyurethane, each related to 100 parts of a polyoxymethylene, this polymer is stabilized against attack by acids, wherein in particular the combination of an alkali metal salt, in particular an oxalate, with small proportions of a thermoplastic polyurethane is advantageous. The proportion of thermoplastic polyurethane may be reduced when the thermoplastic polyurethane has a Shore A hardness of 70 to 96. The weight loss of a stabilized POM under the action of acid may be less than 3% of that of an unstabilized POM. The products are useful when exposed to acidic agents such as irrigation systems, dishwashers, sanitary installations.
    • 具有改善的酸稳定性的聚甲醛,其制备方法和用途。 通过加入0.01至5份多元酸的碱金属盐,例如草酸,柠檬酸和/或0.01至5份聚亚烷基二醇,例如聚乙二醇和/或0.1至100份热塑性聚氨酯 各自与100份聚甲醛相关,该聚合物被抗酸侵蚀稳定,其中特别是碱金属盐,特别是草酸盐与小比例的热塑性聚氨酯的组合是有利的。 当热塑性聚氨酯的肖氏A硬度为70至96时,热塑性聚氨酯的比例可能会降低。在酸作用下稳定的POM的重量损失可能小于不稳定的POM的重量损失的3%。 当暴露于酸性剂如灌溉系统,洗碗机,卫生设备时,该产品是有用的。
    • 3. 发明授权
    • Method for processing crude polyoxymethylene
    • 粗聚甲醛加工方法
    • US5541284A
    • 1996-07-30
    • US406141
    • 1995-03-20
    • Detlef ArnoldiUdo GroppEdwin Nun
    • Detlef ArnoldiUdo GroppEdwin Nun
    • C08G2/28C08G2/10
    • C08G2/28
    • The subject invention relates to method for processing crude polyoxymethylene in which the isolation of unstable components from crude polyoxymethylene, such as residual monomers which are at least partly in the form of cyclic formaldehyde derivatives, is effected by treatment of the crude polyoxymethylene with an inert gaseous medium. The method of the invention is characterized in that the gaseous medium contains at least 10 volume % of water vapor, and less than 0.1 volume % of a volatile base, and/or less than 1 volume % of a volatile solvent. In an alternative variant method, the gaseous medium contains at least 10 volume % of water vapor and the treatment occurs at a temperature between 114.degree. C and the softening temperature of the crude polyoxymethylene and at a pressure of less 1.2 .multidot.10.sup.5 Pa.
    • 本发明涉及用于处理粗聚甲醛的方法,其中从粗聚甲醛分离不稳定组分,例如至少部分为环状甲醛衍生物形式的残留单体,其通过用惰性气体处理粗聚甲醛来实现 中。 本发明的方法的特征在于,气态介质含有至少10体积%的水蒸气和少于0.1体积%的挥发性碱,和/或少于1体积%的挥发性溶剂。 在另一变体方法中,气体介质含有至少10体积%的水蒸气,并且处理在114℃和粗聚甲醛的软化温度之间并且在1.2×10 5 Pa以下的压力下进行。
    • 5. 发明授权
    • Method of producing non-vitrified processing aid low in residual
monomers for thermoplastic polymers
    • 生产用于热塑性聚合物的残留单体低的非玻璃化加工助剂的方法
    • US5767231A
    • 1998-06-16
    • US504853
    • 1995-07-20
    • Volker SchullDetlef Arnoldi
    • Volker SchullDetlef Arnoldi
    • C08F6/14C08F6/00C08F6/06C08L27/06C08L33/12C08F6/16
    • C08F6/001C08F6/006C08L27/06C08L33/12
    • A method for lowering the residual monomer content of non-vitrified processing aids for thermoplastic polymers involves subjecting an emulsion polymerizate containing methylmethacrylate and, optionally, up to 50% by weight of a comonomer to a post-catalysis step to reduce the residual monomer content followed by a spray-drying step where the residual monomer content is further reduced. The spray-drying step is performed at an exit temperature which is either above the boiling point of methylmethacrylate or if an optional comonomer is present which has a higher boiling point than methacrylate, at a temperature above the boiling point of the comonomer. The resulting product which is suitable for use as a non-vitrified processing aid has a residual monomer content of 100 ppm or less. The processing aid can be used with thermoplastics to form containers, e.g., beverage bottles of PVC, which would not adversely affect odor or taste of the contained food product.
    • 降低热塑性聚合物的非玻璃化加工助剂的残留单体含量的方法包括将含有甲基丙烯酸甲酯和任选的至多50重量%的共聚单体的乳液聚合物经历催化后步骤以减少残余单体含量,随后 通过喷雾干燥步骤进一步降低剩余单体含量。 喷雾干燥步骤在高于甲基丙烯酸甲酯的沸点的出口温度下进行,或者在高于共聚单体沸点的温度下,如果存在沸点高于甲基丙烯酸酯的任选共聚单体。 得到的适用于非玻璃化加工助剂的产品的残留单体含量为100ppm以下。 加工助剂可以与热塑性塑料一起使用以形成容器,例如PVC的饮料瓶,其不会不利地影响所含食品的气味或味道。