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    • 6. 发明授权
    • Polyoxymethylene moulding compositions with improved heat stability and stability against discoloration
    • 具有改善的热稳定性和抗变色稳定性的聚甲醛模塑组合物
    • US06191222B1
    • 2001-02-20
    • US09130470
    • 1998-08-07
    • Bruno KellerStephanie SchauhoffKlaus DornHartmut AltDietrich Michelchen
    • Bruno KellerStephanie SchauhoffKlaus DornHartmut AltDietrich Michelchen
    • C08L5900
    • C08L59/00C08L2666/04
    • Polyoxymethylene moulding compositions of the invention comprise (i) at least one polyoxymethylene homo- and/or copolymer, (ii) at least one conventional additive and (iii) at least one polymeric plastics material as an additive for improving the heat stability, and are distinguished in that (iii) is a copolymer which is obtainable by polymerization in bulk of a mixture of A) 60-90 parts of one or more (meth)acrylates, B) 10-40 parts of one or more (meth)acrylamides, C) per 100 parts of A)+B), >0.2 to 5 parts of molecular weight regulator and D) per 100 parts of A)+B), up to 2 parts of lipophilic free radical polymerization initiators, and in that the moulding composition comprises (iii) in an amount of 0.01 to 2 parts, based on the sum of (i)+(ii) where all the amounts relate to parts by weight (wt/wt) and A) and B) together must give 100 parts. By the use of relatively highly regulated bulk co- or terpolymerization for stabilizing POM moulding compositions, advantages over the use of emulsion or suspension bead polymerization result in the heat stability, in the stability against discoloration and/or in the residual monomer contents of POM moulding compositions and shaped articles and shaped films produced therefrom.
    • 本发明的聚氧亚甲基成型组合物包含(i)至少一种聚甲醛均聚物和/或共聚物,(ii)至少一种常规添加剂和(iii)至少一种聚合塑料材料,作为改善热稳定性的添加剂,并且 不同之处在于(iii)是通过本体混合的A)60-90份一种或多种(甲基)丙烯酸酯,B)10-40份一种或多种(甲基)丙烯酰胺,C )每100份A)+ B),> 0.2至5份分子量调节剂和D)/ 100份A)+ B),至多2份亲脂性自由基聚合引发剂,并且模塑组合物包含( iii)按照所有量与重量份(wt / wt)相关的(i)+(ii)和A)和B)之和的总和为0.01至2份,B)一起必须给出100份。 使用相对高度调节的体积共聚或三元共聚来稳定POM模塑组合物,优于使用乳液或 悬浮珠聚合导致热稳定性,POM成型组合物和成形制品的残留单体含量的稳定性和/或由其制备的成型制品的稳定性。
    • 9. 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。