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公开(公告)号：US5066770A
公开(公告)日：1991-11-19
申请号：US334424
申请日：1989-04-07
CPC分类号： C08G73/1028
摘要： A process for manufacturing a polymer includes the first step of reacting a solution of one of two starting materials in an organic solvent with the other material in the form of a powder, and the second step of reacting a solution of the reaction product of the first step in an organic solvent with a solution of the other material in an organic solvent. The process preferably includes one or both of two additional steps, i.e. filtering the reaction product of the first step, and degassing the reaction product of the second step by stirring it at a reduced pressure. An apparatus for carrying out the process is also disclosed. This invention makes it possible to produce a polymer of high and uniform quality having a final viscosity controlled within a certain range and not containing foreign matter or bubbles.
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2.发明授权
公开(公告)号：US5030409A
公开(公告)日：1991-07-09
申请号：US305681
申请日：1989-02-03
CPC分类号： B29C47/8875 , B29C41/28 , B29C41/46 , B29C47/0021 , B29C47/884 , B29C47/885 , B29D7/01 , B29C35/04 , B29C35/16 , B29C47/003
摘要： An end portion-treating method and apparatus for manufacturing a synthetic resin film by first extruding through a slit die or coating with the use of a coater onto or on a conveyor belt or drum a fluid synthetic resin composition in a smooth layer form, and then solidifying it. Gas is blown at both end portions of the film of the fluid synthetic resin composition extruded onto the surface of the conveyor belt or drum to change the sectional form of both end portions. A synthetic resin film is obtained without creasing in the process of drying or cooling of the film or lifting of the film off the surface of the conveyor belt. A film of superior quality is thus provided. Also, since both longitudinal end portions of the film need not be trimmed off and discarded, the film manufacturing effifiency is improved, and the manufacturing cost is reduced substantially.
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公开(公告)号：US5026820A
公开(公告)日：1991-06-25
申请号：US336389
申请日：1989-04-11
摘要： Disclosed is a process for continuously mixing two liquid components, whose one liquid component is a two-liquid curing type resin which comprises continuously supplying one liquid component under stirring into a mixing container and pouring the other liquid component into said container by pushing open a needle forcibly provided to a check valve, the improvement wherein said needle is pushed open with a non-curing liquid, thereafter, a curing liquid is poured into said mixing container. According to the present invention, when, for example, a polyamide acid and a curing agent are caused to mix and react with each other, a transparent polyimide mixed uniformly is obtained and high quality molded articles of polyimide are provided therefrom.
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公开(公告)号：US4976547A
公开(公告)日：1990-12-11
申请号：US499212
申请日：1990-03-19
IPC分类号： B29B7/40
CPC分类号： B29B7/408
摘要： Disclosed is a continuous two-liquid type mixer comprising:a cylindrical container having an liquid inlet at one end and an outlet at the other end;rows of stationary stirring blades on the inside of said cylindrical container protruding substantially radially on the same periphery;a rotor to rotate about the same axis and housed in said cylindrical container; androws of rotary stirring blades on the outside of said rotor protruding substantially radically on the same periphery in an alternate relation with said rows of stationary stirring blades on the inside of said cylindrical container, wherein at least one liquid injection inlet is provided on either or both of said stirring blades on said liquid inlet side. According to the present invention, even highly viscous liquids can be mixed quickly and uniformly and troubles caused by ununiform mixing can be solved without fail.
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