Abstract: Soluble polyphosphazenes which can be cured at moderate temperatures by the action of moisture are obtained when polyphosphazenes containing small amounts of OH functionality in the side chains are reacted with an excess of polyisocyanate in the presence of a suitable catalyst.

Abstract: HIgh molecular weight poly(dihalophosphazenes) which exhibit solubility in benzene and in substituted benzenes are prepared in solution or in bulk from dihalophosphazenes such as (Cl.sub.2 PN).sub.3.sub.-7 at moderate temperatures by the use of novel polymerization catalysts.

Abstract: Triamino pyridine compounds, and their precursors, are described from which polymers exhibiting excellent thermal stability are prepared by reaction with selected di-, tri- or tetra-functional acid derivatives.

Abstract: An improved synthesis of N,N',N",N'"-tetra-salicylidene pentaerythrityl tetramine via pentaerythrityl benzene or toluene sulfonates.

Abstract: Fire resistant poly(phosphazene) vulcanizates can be produced as foams or as foam coatings. The resulting articles exhibit excellent flame retardancy.

Abstract: A method for monitoring the optical development of non-silver free radical film in which the fog buildup in a selected non-image portion of the film is used to control the intensity and/or duration of the development exposure so as to insure a desired level of contrast between image and non-image areas in the developed film.

Abstract: The keeping qualities (shelf life), and photographic speed of non-silver free radical photosensitive materials are increased by the incorporation of at least one of each of three classes of additives, namely:(1) a stabilizer, usually an alcohol or a phenol;(2) a speed enhancer; and(3) a compound which enhances the capability of heat fixing of films containing both (1) and (2).

Abstract: The preparation of leucodihydroanthracenes represented by the general formula ##SPC1##Wherein each of Z and Z' is selected from the group consisting of H and dialkylamino, and at least one Z is dialkylamino and each Q is selected from the group consisting of H and alkyl (C.sub.1 -C.sub.

Abstract: The properties of fluoroalkoxyphosphazene polymers are improved by compounding the polymers with certain fillers some of which may be reactive, a class of polyfunctional coagents, a vulcanizing agent and possibly other additives and thereafter vulcanizing the resulting compositions. The resulting vulcanizates have improved properties and extend the utility of the phosphazene polymers for use as mechanical goods, seals, O-rings and gaskets for extreme service environments.

Abstract: Photoresists are developed and the supporting substrate is etched simultaneously therewith by bringing the resist (after exposure) into physical contact with a fluid containing a developer for the resist and an etchant for the supporting substrate.

Abstract: This invention relates to substituted tetraamino pyridines and to methods whereby such compounds are prepared. It also relates to the linear precyclized polymers produced by reaction of substituted tetraaminopyridines, or their acid salts, with a substantially equimolar amount of a suitable bis(acid halide) or dianhydride in a polar aprotic solvent at temperatures between about -10.degree.C and 70.degree.C. The resulting soluble, high molecular weight precyclized intermediates can be cyclodehydrated and may also be crosslinked to yield novel polybenzimidazoles and polyimidazopyrrolones.

Abstract: This invention relates to compositions which are sensitive to light and suitable for photography and photographic reproduction purposes. More particularly, the invention relates to the production of stable, colored print-out and developable-out images produced by exposing to light, and to light and heat, combinations of aryl amines, halogenated hydrocarbon compounds, and N-vinyl compounds disposed in a suitable base.