| abstract |
Process for the preparation of polysiloxaneimides by reacting benzophenone-3,3 ', 4,4'-tetracarboxylic acid dianhydride with a diamino-organopolysiloxane of the general formula NH₂-R - [- Si (R ') ₂O-] n -Si (R') ₂-R-NH₂, (I) in which R and R 'represent a divalent or monovalent aliphatic or aromatic radical and n is an integer greater than 1 and 2,4- and / or 2,6-tolylene diisocyanate, the diamino-organopolysiloxane in an amount between 1 and 10 mol% and the 2,4- and / or 2,6-tolylene diisocyanate in an amount between 99 and 90 mol%, based in each case on the benzophenone-3,3 ', 4,4'-tetracarboxylic acid -dianhydride, can be used. |