Abstract: A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising a poly(hydroxyalkylated)polyethyleneamine or a poly(hydroxyethyl)polyethyleneimine or mixtures of each or both, the additive being present in an amount sufficient to increase the compressive strength of the hardened mix. Generally, the additive is present in a total amount of up to about 1.0% by weight based upon the weight of the cement, usually in an amount of between about 0.01% and about 0.25% by weight based upon the weight of the cement, preferably in an amount in the range of about 0.02% to about 0.07% by weight.

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.3-7 at moderate temperatures by the use of novel polymerization catalysts.

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.3-7 at moderate temperatures by the use of novel polymerization catalysts.

Abstract: Soluble precyclized precursors to polybenzimidazoles and similar polyheterocyclic polymers are prepared by reacting (1) an acid derivative such as a bis(acid halide) or mono(acid halide)anhydride or dianhydride of a di-, tri-, or tetra-basic acid, with (2) an acid salt of a tetraaminopyridine in which the four position is substituted with an alkyl group, or with (2) an acid salt of an .alpha.,.alpha.-N,N'-disubstituted tetraaminopyridine, or with (2) an acid salt of a N,N'-disubstituted bipyridyl compound.

Abstract: Scrap photographic film comprising at least a four component system involving a polyalkyleneterephthalate film base, an adhesive or subbing layer utilizing a terpolymer consisting chiefly of polyvinylidenechloride and a gelatin layer containing metallic silver or a compound thereof and a variety of contaminants such as causal dirt, dyes and the like is broken down for recovery of the valuable constituents therein including the silver, the polyvinylidenechloride terpolymer, and the polyesters by treating the chopped photographic film at an elevated temperature with a solvent for both the polyester and polyvinylidenechloride values in which solvent both the gelatin and silver values are insoluble, under conditions chosen to insure the quantitative recovery of the silver values.

Abstract: A process for upgrading polyesters derived from aromatic dicarboxylic acids which comprises reaction of the polyester material (both virgin and scrap) in an aprotic polar solvent with any of the following:A. diisocyanates represented by the general formula R(NCO).sub.2 with difunctional reagents in which the functionality is selected from --OH, --NH and/or --COOH; and,B. isocyanate terminated polymers alone or with the above difunctional reagents.The invention also includes stabilization of the products obtained from the above, with organic phosphites.The polyester products, whether or not stabilized, are found to be upgraded with respect to both molecular weight and processability as compared with the starting material and are readily recoverable in powder form which is most desirable for subsequent use.

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: 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: 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.