Process for preparing polyimides by treating polyamide-acids with lower fatty monocarboxylic acid anhydrides
United States Patent 3,179,630 PROCESS FOR PREPARING POLYIMIDES BY TREATING POLYAMIDE-ACIDS WITH LOW- ER FATTY MGNOCARBQXYLIC ACID AN- HYDRIDES Andrew Laszlo Endrey, Parma, Ohio, assignor to E. I. du Pont de Nemours and Company, Wilmingt...
EA Laszlo - US
Process for preparing aromatic polyimides, polyimides prepared thereby
The polymer can then be isolated by concentration or precipitation as a powder, or the polymer in solution can be used to prepare coatings on various substrates.
GF D'Alelio - US
Coatings and laminating varnishes
The products of the invention are acetylene end-capped polyimide oligomers prepared from a dianhydride of an aromatic tetracarboxylic acid such as 3,3',4,4...
WY Chow，WJ Heilman - US
Manufacture of phthalocyanine dyestuffs
530,881. Dyes. HADDOCK, N, H., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. June 21, 1939, No. 18138. [Class 2 (iii)] Tetrapyridyl-phthalocyanines are made by reacting tetrazdiazotized tetraminophthalocyanines, which are obtainable by the proc...
HADDOCK NORMAN HULTON - US
Novel acetylene end-capped polyimide oligomers
The products of the invention are acetylene end-capped polyimide oligomers prepared from a dianhydride of an aromatic tetracarboxylic acid such as 3,3',4,4' benzophenonetetracarboxylic acid, an aromatic triamine, and an acetylene-substit...
WY Chow，WJ Heilman - US
Novel end-capped polyimide oligomers
The products of the invention are end-capped polyimide oligomers prepared from a dianhydride of an aromatic tetracarboxylic acid such as 3, 3'4',4'-benzophenonetetracarboxylic acid, an aromatic diamine, and a 1- (aminoaryl)-3-hydroxy-3-m...
PA Antonoplos，WJ Heilman - US
Novel vinyl end-capped polyimide oligomers
The products of the invention are vinyl end-capped oligomers which have the structure as shown in FIG. 3. The products are prepared from either of two (2) precursors. The first precursor is a compound which has the structure as shown in ...
WJ Heilman，DJ Hurley - US
Chain-extending phenolic end-capped polyimides
Aromatic polyimides with phenolic end groups are chain- extended (molecular weight increased) by reacting them with formaldehyde, compounds capable of generating formaldehyde under the reaction conditions or hexamethylene tetramine in th...
GF D'Alelio - US
PREPARATION OF HETEROCYCLIC POLYMERS FROM HETEROAROMATIC TETRAMINES
Complete Patent Searching Database and Patent Data Analytics Services.
A Gerber，S Koch - US
Coloring matters of the phthalocyanine series
An object of the present invention is to provide new phthalocyanines. A further object is to provide a process for the manufacture of such new phthalocyanines. A still further object is to provide new compositions of matter. Other object...
Flower, Bradbrook Eric，Morris, Heilbron Isidor，Holroyde, Hey Donald，... - US
