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    Process for a diaphragm for electroacoustic transducers
    4.
    发明授权
    Process for a diaphragm for electroacoustic transducers 失效
    电声换能器隔膜的工艺

    公开(公告)号：US06655001B1

    公开(公告)日：2003-12-02

    申请号：US09926706

    申请日：2002-02-12

    申请人： Dirk Roosen ,  Leonhard Maier ,  Hermann Seibert

    发明人： Dirk Roosen ,  Leonhard Maier ,  Hermann Seibert

    IPC分类号： H04R3100

    CPC分类号： B32B37/18 ,  B32B2305/022 ,  B32B2309/02 ,  B32B2309/12 ,  B32B2333/04 ,  H04R7/125 ,  H04R31/003 ,  Y10T29/42 ,  Y10T29/49005 ,  Y10T29/49126

    摘要： A diaphragm for an electroacoustic transducer has a) a core layer containing poly(meth)acrylimide foam and b) at least one cover layer. The diaphragm is produced by laminating the cover layer with the core layer, using a pressure of 0.4 MPa and a temperature of 160° C., whereby at least the side of the core layer which comes into contact with the cover layer is compressed. The resultant composite is subsequently cooled to a temperature below 80° C., before the pressure is reduced to the ambient pressure. The process can be carried out as a single-step process. The diaphragms produced by this process demonstrate an excellent stability, whereby the cover layers in particular are highly resistant to separation.

    摘要翻译： 用于电声换能器的隔膜具有：a）含有聚（甲基）丙烯酰亚胺泡沫的芯层和b）至少一个覆盖层。 隔膜通过使用0.4MPa的压力和160℃的温度将覆盖层与芯层层压而制成，由此至少与覆盖层接触的芯层的一侧被压缩。 随后将所得复合材料冷却至低于80℃的温度，然后将压力降至环境压力。 该过程可以作为单步过程进行。 通过该方法制备的隔膜显示出优异的稳定性，由此覆盖层特别是高度抵抗分离。

    Process for the production of polymethacrylimide foam materials
    5.
    发明授权
    Process for the production of polymethacrylimide foam materials 失效
    聚甲基丙烯酰胺泡沫材料生产工艺

    公开(公告)号：US5928459A

    公开(公告)日：1999-07-27

    申请号：US66776

    申请日：1998-04-27

    申请人： Werner Geyer ,  Hermann Seibert ,  Sabine Servaty

    发明人： Werner Geyer ,  Hermann Seibert ,  Sabine Servaty

    IPC分类号： C08J5/24 ,  B32B27/30 ,  C08F8/48 ,  C08F220/06 ,  C08F220/50 ,  C08J9/04 ,  C08J9/06 ,  C08J9/14 ,  C08K3/22 ,  C08K5/20 ,  C08L33/02 ,  C08L33/22 ,  C08J4/00 ,  B05D5/00 ,  C08J101/00 ,  C08J201/00

    CPC分类号： C08J9/142 ,  C08J9/06 ,  C08J2201/03 ,  C08J2333/24

    摘要： Polymethacrylimide foams are prepared by a method, comprising:preparing a mixture consisting of(a) a monomer mixture of 40-60 wt. % methacrylonitrile, 60-40 wt. % methacrylic acid, and, optionally, up to 20 wt. %, based on the sum of methacrylic acid and methacrylonitrile, of other monofunctional, vinyl-unsaturated monomers,(b) 0.5-8 wt. % of a propellant mixture of formamide or monomethyl formamide and a univalent C.sub.3-8 -aliphatic alcohol,(c) a cross-linking agent system, which consists of(c.1) 0.005-5 wt. % of a vinyl-unsaturated compound which can be radically polymerized, with at least two double bonds in the molecule, and(c.2) 1-5 wt. % magnesium oxide, dissolved in the monomer mixture, and at least one radical initiators and optionally at least one additive, shaped in the form of a sheet;polymerizing the monomers in the sheet;subsequently foaming the polymerizate sheet at temperatures from 200-260.degree. C.; and thenheat treating the sheet in two steps, at a first step of 2-6 hours at 100-130.degree. C. and a second step of 32-64 hours at 180-220.degree. C.

    摘要翻译： 聚甲基丙烯酰胺泡沫体通过以下方法制备：包括：制备由（a）40-60重量份的单体混合物组成的混合物， ％甲基丙烯腈，60-40重量％ ％甲基丙烯酸，以及任选地至多20wt。 ％，基于甲基丙烯酸和甲基丙烯腈的总和，其它单官能的乙烯基不饱和单体，（b）0.5-8wt。 ％的甲酰胺或单甲基甲酰胺和一价C 3-8脂族醇的推进剂混合物，（c）交联剂体系，其由（c.1）0.005-5wt。 ％的可以自由基聚合的乙烯基不饱和化合物，在分子中具有至少两个双键，和（c.2）1-5wt。 溶解在单体混合物中的％氧化镁，以及至少一种自由基引发剂和任选的至少一种成形为片状的添加剂; 聚合片中的单体; 随后在200-260℃的温度下使聚合物片发泡。 然后在100-130℃的2-6小时的第一步骤和180-220℃的第二步32-64小时的两个步骤中进行两步热处理。