Rhone-poulenc Chimie

Rhone-poulenc Fibres

Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

S.n.c. Kermel

Philippe Michaud

Yves Camberlin

Jean Russo

Rene Dien

Marie-Eve Perier

Christian Prud'Homme

Pascal Barthelemy

Morand Lambla

Process for spinning from solution of polyamide-imides (PAI) based on tolylene or meta-phenylene diisocyanates and fibers thus obtained

Storage-stable/clear solutions of linear aromatic poly(imideamides), well adopted for forming high luminance films and varnishes, comprise (a) an anhydrous .gamma.-butyrolactone solvent phase, such .gamma.-butyrolactone solvent phase (a) having from 5% to 40% by weight of a linear aromatic poly(imideamide) (b) dissolved therein, such linear aromatic poly(imideamide) (b) comprising the copolymerizate of (i) 2,4-diisocyanatotoluene, 2,6-diisocyanatotoluene, or mixture thereof, with (ii) a tricarboxylic acid monoanhydride, e.g., trimellitic acid monoanhydride, optionally, (iii) an aromatic dicarboxylic acid, e.g., terephthalic or isophthalic acid, and (iv) a monocarboxylic acid or dicarboxylic acid monoanhydride chain limiting agent, e.g., benzoic acid or phthalic anhydride.

Storage-stable/clear solutions of poly(imideamides)

The present invention relates to a process for obtaining PAI fibres by spinning PAI in solution and to the fibres thus obtained. They are obtained by dry or wet spinning into dimethylalkyleneurea followed by removal of the solvent and overdrawing at high temperature. The yarns and fibres obtained are produced from PAI based on tolylene or meta-phenylene diisocyanate, and on an aromatic acid anhydride and/or an aromatic dianhydride, and optionally on one or a number of diacid compounds. They exhibit an outstanding thermomechanical behavior and make it possible to gain access to very low linear densities.

Process for spinning from solution of polyamide-imides (PAI) based on

Solutions of polyamideimides in .gamma.-butyrolactone, process for

Polyimide solutions and method of obtaining them

Impregnating solutions based on at least one reactive thermoplastic poly

Novel thermally stable bisimido/allylaniline polymers and prepolymers, well adopted for the production of prepregs and reinforced and impregnated composite shaped articles, comprise the copolymerizates of (a) at least one N,N'-bisimide, with (b) at least one hindered p-allylaniline, optionally in the presence of (c) an organic peroxide, azobisisobutyronitrile or an imidazole, (d) a vinylpyridine, N-vinylpyrrolidone, allyl isocyanurate, vinyltetrahydrofuran, or mixture thereof, (e) at least one diprimary diamine, and/or (f) an unhalogenated or chlorinated/brominated epoxy resin or N,N'-alkylenebistetrahalophthalimide, or particular (meth)acrylate or alkenylphenol.

Thermally stable bisimido/p-allylaniline copolymers

Novel low melt viscosity imido prepolymers, well adapted for the production of prepregs and filament wound shaped articles, are prepared by copolymerizing (a) at least one N,N'-bismaleimide with (b) at least one siloxane bismaleimide, (c) at least one aromatic diprimary diamine, (d) optionally, at least one olefinically unsaturated comonomer other than a bisimide, (e) optionally, a catalyst, and (f) either an acrylate or an unhalogenated epoxy resin.

Imido/siloxane bismaleimide/aromatic diamine prepolymers

The present invention relates to a process for obtaining semiordered polyamides-imides. More particularly it consists in performing the polycondensation in two separate stages:

Process for the preparation of semiordered polyamides-imides

Linear aromatic poly(amideimide)s having latent maleimide endgroups, readily converted to maleimido polymers that can be crosslinked/shaped into useful molded articles, are prepared by directly copolymerizing an aromatic diisocyanate (i) with a tricarboxylic acid monoanhydride (ii) and a monocarboxylic acid (iii) containing a blocked maleimide functional group.

Linear aromatic poly(amideimide)s having latent maleimide endgroups

Novel thermally stable imido polymers, whether in prepolymeric or cured state, well adapted for the production of prepregs and other useful shaped articles, include the copolymerizates of:

Novel imido polymers

Thermally stable copolyimidoamides containing recurring diorganopolysiloxane structural units are improvedly prepared by directly interreacting, in a solvent medium:

Preparation of thermally stable copolyimidoamides containing

Thermally stable block copolymers, well adapted for the production of coating films, include recurring imide/amide blocks of the formula: ##STR1## and recurring urea/siloxane blocks of the formula:

Thermally stable (imide/amide)/(urea/siloxane) block copolymers

Novel curable aromatic polyamidoimides having alkenyloxy end groups, well adopted as coating solutions or for the production of solid shaped articles, are prepared by the direct interreaction among (i) an aromatic diisocyanate, (ii) a monoanhydride of a tricarboxylic acid and (iii) an alkenyloxylated monocarboxylic acid, and have the following structural formula (I): ##STR1##

Alkenyloxylated aromatic polyamidoimides

Novel curable aromatic polyamidoimides having maleimido end groups, well adopted as coating solutions or for the production of solid shaped articles, are prepared by the direct interreaction among (i) an aromatic diisocyanate, (ii) a monoanhydride of a tricarboxylic acid and (iii) a monocarboxylic acid bearing a maleimido substituent, and have the following structural formula (I): ##STR1##

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Lyons, France

Philippe Michaud