Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1991-10-03
1993-02-16
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525436, 525452, C08L 7706
Patent
active
051872412
ABSTRACT:
The invention relates to the formation of isoimides from amic acids, especially polyisoimides by a novel process in which polyimides are first converted to polyamic acids and then contacted with an isoimidizing agent. An acyl halide of a heterocyclic nitrogen compound or an acyl halide of a heterocyclic sulphur compound can be used as the isoimidizing agent. The isoimidization may also be carried out in the presence of a compound containing a heterocyclic nitrogen especially a solvent containing a heterocyclic nitrogen.
The invention is especially applicable to conducting nucleophilic addition reactions on the surface of polyimides where the surface has been converted to a polyamic acid or on the surface of polyamic acid materials followed by isoimidization and reaction of the isoimide with a nucleophile such as an amine or organic hydroxy compound.
Photosensitive metal compounds or electroless metal coating catalysts can be coordinated with the compositions obtained.
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Buchwalter Stephen L.
Frank Ernest R.
O'Toole Terrence R.
Thomas Richard R.
Viehbeck Alfred
International Business Machines - Corporation
Welsh Maurice J.
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