The Dow Chemical Company

Richard D Peffley

Robert B Turner

Franciszek Olstowski

Ralph D Priester, Jr

James A Vanderhider

Ronald M Herrington

Oomman P Thomas

Earl E Burt, Iii

Jorge Soto

Joginder N Anand

Raymond A Plepys

James R Porter

Manuel Gonzales, Jr

Kimbley A Bushman

Robert A Kuklies

Donald J Burchell, Jr

John H Spells

The invention includes a process for preparing a flexible, water-blown polyurea foam by reacting a reaction mixture containing at least one polyisocyanate component and an active hydrogen component, wherein active hydrogen compounds of relatively high equivalent weight have an average of about 1.5 to about 4 active hydrogen-containing groups per molecule, of which active hydrogen-containing groups: an average of (a) from about 5 to about 60 percent are primary aliphatic amine groups or (b) at least about 25 percent are primary aromatic, secondary aliphatic, Lewis acid-blocked primary or secondary aliphatic or aromatic amine groups or mixtures of such groups. An amount of at least one alkali metal halide salt effective to increase load bearing strength of the foam is incorporated into the reaction mixture. Differing amounts of alkali metal halide salts are suitably incorporated into different areas of the foam to produce areas having differing load bearing strengths. The invention includes the foams formed by the processes of the invention as well as active hydrogen compositions containing the alkali metal halide salts and useful in the processes.

Flexible polyurea foams having controlled load bearing qualities

Disclosed are novel, stable aqueous dispersions of ionic polyurethane-urea prepared by reacting an aliphatic or cycloaliphatic diisocyanate, an organic polyol, a large particle size hydrophobic copolymer polyol, a difunctional isocyanate reactive component, and a water dispersible amine chain extender. Also disclosed are the films and coated substrates obtained through the use of said dispersions as coatings.

Polyurethane-urea resins with incorporated hydrophobic microparticle

A liquid prepolymer composition is disclosed which contains free isocyanate groups which is the reaction product of a stoichiometric excess of a polyisocyanate and an active hydrogen-containing compound which contains an internal rigid polyaromatic grouping. Polyurethane and/or polyurea polymers made from these prepolymer compositions are also disclosed.

Polyisocyanate prepolymers prepared from rigid polyaromatic precursor

Polyisocyanates containing dissolved or colloidally dispersed polymers containing rigid moieties are disclosed. Included among the dissolved or colloidally dispersed polymers are polymers ethylenically unsaturated polyaromatic compounds, ethylenically unsaturated benzoic acid derivatives, ethylenically unsaturated steroid derivatives, and rigid aromatic polyurethane and/or polyurea polymers. The dissolved or colloidally dispersed polymers provide substantial reinforcement and physical property improvement to polyurethane or polyurea polymers made from the polyisocyanate solution or dispersion.

Polyisocyanate compositions containing rigid compounds or polymers, and

Flexible polyurethane foams are prepared by reacting a polyisocyanate with certain amine-terminated compounds. The amine terminated compounds are characterized in having at least 30 percent of their active hydrogen-containing groups in the form of primary aromatic, Lewis acid-blocked primary aliphatic and/or secondary aromatic or aliphatic amine groups. The resulting foams exhibit excellent physical properties, even in the absence of a cross-linker compound.

Flexible polyurea or polyurea-polyurethane foams prepared from high

This invention is an improvement in a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material. In another aspect, this invention is a quasi-prepolymer which comprises a solution of an isocyanate-terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.

Polyurethane elastomers prepared from high molecular weight prepolymers

This invention is a process for preparing polyurethane and/or polyurea elastomer comprising reacting a liquid, preformed isocyanate-terminated prepolymer, which prepolymer is the reaction product of a stoichiometric excess of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive compound, with a chain extender mixture, which chain extender mixture comprises

Polyurethane elastomers prepared in a two-step process using mixtures of

This invention comprises a process whereby an amine functional compound having an equivalent weight of at least about 400 is reacted with an excess of a polyisocyanate to form an isocyanate-terminated prepolymer or quasi prepolymer, which polymer or quasi prepolymer is reacted with an isocyanate-reactive material which is preferably a relatively low equivalent weight polyol or mixture thereof with an additional amount of said amine functional compound or a relatively high equivalent weight polyol to form a polyurea containing polymer which is preferably non-cellular or microcellular.

Polyurea polymers prepared from urea containing prepolymers

Reaction injection molded polyurethanes prepared from a composition comprising (A) a relatively high molecular weight polyol, (B) a chain extender and (C) an aliphatic polyisocyanate or polyisothiocyanate are improved by replacing a portion of the relatively high molecular weight polyol with an aminated or partially aminated polyoxyalkylene material.

Reaction injection molded polyureas employing high molecular weight

Reaction injection molded polyurethanes prepared from a composition comprising (A) a relatively high molecular weight polyol, (B) a chain extender and (C) a polyisocyanate or polyisothiocyanate are improved by replacing a portion of the relatively high molecular weight polyol with an aminated or partially aminated polyoxyalkylene material.

Reaction injection molded polyurethanes employing high molecular weight

A method for gelling relatively high molecular weight polyoxyalkylene-containing materials having a block of at least about 10 weight percent of oxyethylene units by blending therewith a sufficient quantity of a relatively low molecular weight material having at least two hydroxyl groups per molecule containing urea dissolved therein.

Non-aqueous urea-polyether gel compositions and a method for their

Incompatible compositions containing a relatively high molecular weight polyol containing terminal primary amine groups and a relatively low molecular weight polyol containing primary hydroxyl groups are rendered compatible by the addition thereto of a substituted urea such as dimethyl urea.

Compatible mixtures of aminated polyether polyols and low molecular

Compositions containing a relatively high molecular weight polyol and ethylene glycol which compositions are incompatible, i.e. separate into two distinct phases upon storage, are compatibilized by the admixture therewith of urea or a substituted urea.

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Lake Jackson, TX, United States of America

Richard D Peffley