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    BLOW-CLEANING METHOD
    6.
    发明专利
    BLOW-CLEANING METHOD 失效

    公开(公告)号：JPH1085692A

    公开(公告)日：1998-04-07

    申请号：JP24607896

    申请日：1996-09-18

    Applicant: TORAY INDUSTRIES

    Inventor： FUKAHORI MITSUYUKI ,  YAMADA MASAAKI

    IPC: B08B9/093 ,  B08B3/08

    Abstract: PROBLEM TO BE SOLVED: To eliminate the need for pure water, ultrapure water, a waste water treating device and a drier and to remarkably reduce cost by blow-cleaning a plastic vessel with an ionized gas. SOLUTION: A plastic vessel 5 (PE bottle) filled with a liq. chemical for an electronic material to be cleaned, in which static electricity is easily generated and on which dust is liable to deposit is cleaned as follows. Namely, the PE bottle 5 is blow-cleaned with an ionized gas or cleaned with a soln. and then blow-cleaned with the ionized gas and dried at the same time. In practice, a pressurized gas of an instrumental compressed air line 1 is passed through a pressure reducing valve 2 for controlling pressure. An oil mist separator 3 to remove oil mist in the gas is set, the gas passed through the separator is supplied to an ionization air gun 4 and ionized, and the inner face of the bottle 5 is blow-cleaned with the ionized gas.

    PRODUCTION OF POLYAMIC ACID SOLUTION
    7.
    发明专利
    PRODUCTION OF POLYAMIC ACID SOLUTION 失效

    公开(公告)号：JPH0912718A

    公开(公告)日：1997-01-14

    申请号：JP16645795

    申请日：1995-06-30

    Applicant: TORAY INDUSTRIES

    Inventor： OKAWA SATOSHI ,  YAMADA MASAAKI

    IPC: C08G73/10

    Abstract: PURPOSE: To obtain the subject solution having excellent storage stability and high viscosity independent of the kind of monomer by adding a specific aromatic or aliphatic dicarboxylic acid anhydride or a specific acid anhydride. CONSTITUTION: An aromatic or aliphatic dicarboxylic acid anhydride of formula I [Ar1 is an (un)substituted aryl, a naphthyl or an aliphatic ring] or an acid anhydride of formula II [Ar2 and Ar3 are each an (un)substituted aryl, a naphthyl or an alkyl] (e.g. phthalic anhydride) is added in the production of a polyamic acid having a viscosity of >=100Ps (measured in 1mL of N-methyl-2- pyrrolidone at 25 deg.C) by reacting (A) a tetracarboxylic acid dianhydride (e.g. 3,3',4,4'-benzophenonetetracarboxylic acid) with (B) a diamine (e.g. 4,4'- diaminodiphenyl ether) in (C) an organic polar solvent (e.g. N-methyl-2- pyrrolidone). The reaction is preferably carried out at >=50 deg.C.

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