Solutions of polyimide-forming starting materials
AssigneeBASF Lacke + Farben, AG
InventorsRainer Blum, Hans J. Heller, Klaus Lienert
Life of this patent
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Abstract
In solutions of polyimide-forming starting materials, containing diamines and tetracarboxylic diesters, at least 2 mol % of the ester groups in the tetracarboxylic diesters are derived from alcohols of the general formula HO--Z--O--X I or HO--Z--X II where Z is a straight-chain or branched aliphatic radical of from 1 to 15 carbon atoms which can be interrupted by from 1 to 4 ether groups --O-- and X is an aromatic radical of from 5 to 20 carbon atoms which can also contain nitrogen, oxygen or sulfur as hetero atoms in the aromatic ring system, excepting benzyl alcohol as compound of the formula II in the case of the use of diamines having a basicity constant of less than or equal to 10.sup.-11.
Claims10
A solution of polyimide-forming starting materials, comprising at least one aromatic or partly aromatic diamine containing at least one aromatic group and at least one aromatic or partly aromatic tetracarboxylic diester containing at least one aromatic ring, wherein at least 2 mol % of the ester groups in the tetracarboxylic diester are derived from alcohols of the general formula
- HO--Z--O--X I
- or
- HO--Z----X II
- where Z is a straight-chain or branched aliphatic radical of from 1 to 15 carbon atoms which can be interrupted by from 1 to 4 ether groups --O-- and X is an aromatic radical of from 5 to 20 carbon atoms which can also contain nitrogen, oxygen, or sulfur as hereto atoms in the aromatic ring system, excepting a solution comprising both benzyl alcohol and at least one aromatic or partly aromatic diamine containing at least one aromatic group and having a basicity constant of less than or equal to 10.sup.-11.
Dependencies are inferred from the claim text.