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    • 7. 发明授权
    • Injection molding method for (meth)acrylate copolymers having tertiary ammonium groups
    • 具有叔铵基的(甲基)丙烯酸酯共聚物的注射成型方法
    • US06576255B1
    • 2003-06-10
    • US09889565
    • 2001-07-30
    • Hans-Ulrich PetereitThomas BeckertManfred AssmusWerner HoessWolfgang FuchsHartmut Schikowsky
    • Hans-Ulrich PetereitThomas BeckertManfred AssmusWerner HoessWolfgang FuchsHartmut Schikowsky
    • A61K948
    • A61K9/1635A61J3/071
    • The invention relates to a process for making molded articles by means of injection molding with the process steps of a) melting of a (meth)acrylate copolymer, which is composed of 30 to 80 wt % of radical-polymerized C1 to C4 alkyl esters of acrylic or methacrylic acid and 70 to 20 wt % of (meth)acrylate monomers with a tertiary ammonium group in the alkyl residue, wherein the (meth)acrylate copolymer is present in a mixture with 1 to 70 wt % of a plasticizer and a desiccant in the ratio of 1:1 to 1:20 and also with 0.05 to 5 wt % of a release agent, and further standard additives or adjuvants and if necessary even a pharmaceutical active principle can also be present in the mixture, and before the mixture is melted it has a content of more than 0.5 wt % of low-boiling constituents with a vapor pressure of at least 1.9 bar at 120° C., b) degassing of the mixture in the thermoplastic condition at temperatures of at least 120° C., whereby the content of low-boiling constituents with a vapor pressure of at least 1.9 bar at 120° C. is lowered to at most 0.5 wt % and c) injection of the melted and degassed mixture into the mold cavity of an injection-molding die, wherein the mold cavity has a temperature which lies at least 10° C. below the glass transition temperature of the (meth)acrylate copolymer, cooling of the melt mixture and removal of the obtained molded article from the mold.
    • 本发明涉及一种通过注射成型制备模塑制品的方法,其工艺步骤为:a)熔融(甲基)丙烯酸酯共聚物,其由30至80重量%的自由基聚合的C1至C4烷基酯组成 丙烯酸或甲基丙烯酸和70〜20重量%的烷基残基中具有叔铵基的(甲基)丙烯酸酯单体,其中(甲基)丙烯酸酯共聚物与1至70重量%的增塑剂和干燥剂 以1:1至1:20的比例和0.05至5重量%的脱模剂,并且进一步的标准添加剂或佐剂,并且如果需要甚至药物活性成分也可以存在于混合物中,并且在混合物之前 熔化,其含量大于0.5重量%的低沸点成分,蒸气压在120℃下至少为1.9巴,b)在热塑性条件下,在至少120℃的温度下脱气混合物 ,其中低沸点成分含量为a 在120℃下至少1.9巴的蒸汽压降低至至多0.5重量%,和c)将熔融和脱气的混合物注射到注射成型模具的模腔中,其中模腔具有位于 在(甲基)丙烯酸酯共聚物的玻璃化转变温度以下至少10℃,冷却熔融混合物并从模具中除去得到的模塑制品。