Process for producing polyisoimide
AssigneeChisso Corporation
InventorsHirotoshi Maeda, Kouichi Kunimune
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Abstract
The present invention provides a dehydrating agent which is less poisonous and which can be easily handled in producing a polyisoimide by dehydrating a polyamic acid. A process is also provided for producing a polyisoimide without requiring the separation of by-products. That is, the process for producing the polyisoimide of the present invention includes the step of using a dihyroquinoline derivative represented by the formula ##STR1## (wherein each R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms) as the dehydrating agent in producing the polyisoimide by dehydrating the polyamic acid.
Claims18
A process for producing a polyisoimide comprising dehydrating a polyamic acid by using a dihydroquinoline derivative represented by the formula ##STR7## wherein each R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms as dehydrating agent in producing the polyisoimide
A process for producing a polyisoimide comprising reacting a tetracarboxylic acid dianhydride with a diamine in an organic solvent to form a polyamic acid solution, and then adding to this solution a dihydroquinoline derivative represented by the formula ##STR8## wherein each R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms to carry out reaction.
A process for producing a polyisoimide comprising reacting a polyamic acid represented by formula (2) ##STR9## with a dihydroquinoline derivative represented by formula (1) ##STR10## in a solvent at a temperature of 0-100.degree., wherein each of R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms, R.sup.3 is a tetravalent organic group having 4 to 15 carbon atoms, R.sup.4 is an organic group having 3 to 27 carbon atoms, or a group represented by the formula ##STR11## wherein R.sup.5 and R.sup.6 are independently methyl, ethyl or phenyl, R.sup.7 is trimethylene, tetramethylene, phenylene or methylphenylene, P is 1 to 100 and n is a positive integer.
A process for producing a polymer having repeating units of an isoimide represented by the formula ##STR13## and repeating units of an amic acid represented by the formula ##STR14## comprising reacting a tetracarboxylic acid dianhydride with a diamine in a solvent to form a solution of a polyamic acid represented by formula (2) ##STR15## adding to the polyamic solution a dihydroquinoline derivative represented by formula (1) ##STR16## and carrying out a reaction at a temperature of 0-100.degree. C.;
- wherein each of R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms, R.sup.3 is a tetravalent organic group having 4 to 15 carbon atoms, R.sup.4 is an organic group having 3 to 27 carbon atoms or a group represented by the formula ##STR17## wherein R.sup.5 and R.sup.6 are independently methyl, ethyl or phenyl, R.sup.7 is trimethylene, tetramethylene, phenylene or methylphenylene, P is 1 to 100 and n is a positive integer.
Dependencies are inferred from the claim text.