Copolyimides, their preparation and the use thereof
First Claim
1. A copolyimide having an inherent viscosity of 0.2 to 3.0 dl/g, measured at 25°
- C. in a solution of 0.5% by weight of said copolyimide in N-methylpyrrolidone, and comprisingA) at least one structural repeating unit of aromatic tetracarboxylic acid radicals (a) which contain 10 to 30 carbon atoms and which are unsubstituted or substituted by halogen, nitro, C1 -C4 alkyl, C1 -C4 alkoxy or phenacyl, and aromatic diamine radicals (b) which contain 6 to 30 carbon atoms and which are unsubstituted or substituted by C1 -C4 alkyl or halogen; and
at least one additional optional structural repeating unit of aromatic tricarboxylic acid radicals (c) of 9 to 30 carbon atoms, which radicals are unsubstituted or substituted as for (a), and of identical or different diamine radicals (b), andB) at least one structural repeating unit of identical or different tetracarboxylic acid radicals (a) and aromatic diamines (d) which contain 6 to 30 carbon atoms and which are unsubstituted or substituted by C1 -C4 alkyl, and which contain at least one --SO3 M group attached to the aromatic nucleus, wherein M is H.sup.⊕
, a mono- to trivalent metal cation, NH4.sup.⊕
or an organic ammonium cation of 1 to 30 carbon atoms; and
additional optional structural repeating units of identical or different aromatic tricarboxylic acid radicals (c) and identical or different diamine radicals (d), with the proviso that at least one of said diamine radicals (b) or (d) is substituted by C1 -C4 alkyl in both ortho-positions to at least one N atom.
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Accused Products
Abstract
Mixtures of salts of organic dicarboxylic acids and organic compounds of non-salt character, dissolved in a C1 -C4 alkanol, can be concentrated or separated with a semipermeable membrane made from a copolyimide which contains a first aromatic diamine radical (1) and a second aromatic diamine radical (2) which carries --SO3 M groups, wherein M is H⊕, a mono- to trivalent metal cation or an ammonium cation. The first amine radical (1) and/or the second diamine radical (2) contains C1 -C4 alkyl groups in both o-positions to at least one amino group. These copolyamides are also radiation-sensitive (self-crosslinking) and can be used for the production of protective layers or relief images, development being carried out in an aqueous alkaline medium.
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Citations
18 Claims
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1. A copolyimide having an inherent viscosity of 0.2 to 3.0 dl/g, measured at 25°
- C. in a solution of 0.5% by weight of said copolyimide in N-methylpyrrolidone, and comprising
A) at least one structural repeating unit of aromatic tetracarboxylic acid radicals (a) which contain 10 to 30 carbon atoms and which are unsubstituted or substituted by halogen, nitro, C1 -C4 alkyl, C1 -C4 alkoxy or phenacyl, and aromatic diamine radicals (b) which contain 6 to 30 carbon atoms and which are unsubstituted or substituted by C1 -C4 alkyl or halogen; and
at least one additional optional structural repeating unit of aromatic tricarboxylic acid radicals (c) of 9 to 30 carbon atoms, which radicals are unsubstituted or substituted as for (a), and of identical or different diamine radicals (b), andB) at least one structural repeating unit of identical or different tetracarboxylic acid radicals (a) and aromatic diamines (d) which contain 6 to 30 carbon atoms and which are unsubstituted or substituted by C1 -C4 alkyl, and which contain at least one --SO3 M group attached to the aromatic nucleus, wherein M is H.sup.⊕
, a mono- to trivalent metal cation, NH4.sup.⊕
or an organic ammonium cation of 1 to 30 carbon atoms; and
additional optional structural repeating units of identical or different aromatic tricarboxylic acid radicals (c) and identical or different diamine radicals (d), with the proviso that at least one of said diamine radicals (b) or (d) is substituted by C1 -C4 alkyl in both ortho-positions to at least one N atom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- C. in a solution of 0.5% by weight of said copolyimide in N-methylpyrrolidone, and comprising
Specification