Amino-protected dopa derivative and production thereof
    41.
    发明授权
    Amino-protected dopa derivative and production thereof 失效
    氨基保护的多巴衍生物及其生产

    公开(公告)号:US5098999A

    公开(公告)日:1992-03-24

    申请号:US569018

    申请日:1990-08-17

    IPC分类号: C07C271/22 C07D253/08

    摘要: 3,4-Dihydroxyphenylalanine wherein the amino group is protected with a 9-fluorenylmethyloxycarbonyl group, or a derivative thereof can be produced by reacting 3,4-dihydroxyphenylalanine with a boron compound or phosphorus compound to stabilize the hydroxyl groups, followed by introduction of a 9-fluorenylmethyloxycarbonyl group thereinto.

    摘要翻译: 其中氨基被9-芴基甲氧基羰基保护的3,4-二羟基苯丙氨酸或其衍生物可以通过使3,4-二羟基苯丙氨酸与硼化合物或磷化合物反应来稳定羟基,然后引入 9-芴基甲氧基羰基。

    Method of preparing polyamide acid for processing of semiconductors
    43.
    发明授权
    Method of preparing polyamide acid for processing of semiconductors 失效
    制备半导体加工用聚酰胺酸的方法

    公开(公告)号:US4447596A

    公开(公告)日:1984-05-08

    申请号:US307199

    申请日:1981-09-30

    CPC分类号: C08G73/1028 H01L21/312

    摘要: An improved method of preparing polyamide acid for processing of semiconductors from a diamine and a tetracarboxylic acid dianhydride optionally with a diaminocarbonamide, is provided (1) by reacting the components at below 40.degree. C. until the reduced viscosity reaches above 0.5 dl/g. at 30.degree. C. and then, (2) by adjusting the reduced viscosity to more than 0.3 dl/g, at 30.degree. C. and the solution viscosity to 500-3,000 cps at 25.degree. C. by heating at 50-100.degree. C. By applying the polyamide acid obtained by the method to semiconductor apparatus, they get sufficient heat-resistance without pin holes, and their reliability may be greatly improved.

    摘要翻译: (1)通过在低于40℃下使组分反应直至比浓粘度达到0.5dl / g以上为止提供了一种由二胺和四羧酸二酸酐任选地与二氨基碳酰胺一起制备用于半导体加工的聚酰胺酸的改进方法。 然后,(2)通过在30℃下将比浓粘度调节至大于0.3dl / g,并将溶液粘度在25℃加热至50-100℃时在25℃下为500-3,000cps 通过将通过该方法获得的聚酰胺酸应用于半导体装置,它们获得足够的耐热性而没有针孔,并且其可靠性可以大大提高。