12.
    发明专利
    未知

    公开(公告)号:FR2374668A1

    公开(公告)日:1978-07-13

    申请号:FR7733130

    申请日:1977-10-27

    Applicant: IBM

    Inventor: HATZAKIS MICHAEL

    Abstract: Polymethyl methacrylate methacrylic acid (P[MMA/MAA]) copolymer powder is prebaked above 200 DEG C. The prebaked powder is dissolved in a suitable casting solvent. The insoluble material produced during prebaking is removed by filtration. Then the solution remaining is applied to a substrate, post-baked at a temperature less than or equal to the prebaking temperature to drive off the solvent, exposed to electron beam radiation, and developed in a developing solvent.

    16.
    发明专利
    未知

    公开(公告)号:DE69106956D1

    公开(公告)日:1995-03-09

    申请号:DE69106956

    申请日:1991-06-11

    Applicant: IBM

    Abstract: A method and apparatus are disclosed for conducting a physical process and a chemical reaction by exposing a material containing a volatile substance to microwave radiation where the morphology of said material will change when exposed to such radiation. The power of said radiation is adjusted over time as the morphology of the material changes to maximize the effect of the radiation in order to produce a product in a minimum amount of time that is substantially free of said volatile substance. The method and apparatus can also be used to conduct such a process or reaction with materials that do not contain a volatile material. In one embodiment a method and apparatus are disclosed for manufacturing a polyimide from a precursor in a solvent by exposing the precursor to microwave radiation in a tuneable microwave resonant cavity (2) that is tuned during imidization to achieve critical coupling of the system. Microwave power is controlled to remove the solvent and obtain the desired level of reaction.

Patent Agency Ranking