Rohm and Haas Company

Peter Reeves Sperry

William D Emmons

Martin Vogel

Kayson Nyi

Willie Lau

Morris C Wills

Jiun-Chen Wu

Richard Roy Clikeman

Chao-Jen Chung

Edward Charles Kostansek

Jack C Thibeault

Fred A Kaplan

Richard J Wiersema

Dennis Paul Lorah

Alvin Michael Maurice

Jen-Chi Chen

Michael Damian Bowe

Gary Robert Larson

Patricia Marie Lesko

Alvin C Lavoie

Andrew W Gross

Robert David Solomon

Gary David Greenblatt

Bradley Keith Hageman

Leo Joseph Procopio

Stewart Orlyn Williams

Stephen Scott Edwards

Margo Raate Schaefer

Lixing Min

Aqueous dispersion of copolymers formed by the polymerization of a monomer mixture containing 0.05% to less than 4.5% by weight of certain terminally unsaturated oligomers are useful for improving the scrub resistance, corrosion resistance, opacifying capacity and/or efflorescence resistance of a coating.

Aqueous composition

Disclosed are uniformly sized domains of liquid crystals, a method for forming the domains, and their performance in polymer dispersed liquid crystal displays. The method provides the ability to form discrete domains of liquid crystal surrounded by a polymer shell, also known as polymer encased liquid crystals, or PELCs. Further, the method provides for the ability to make PELCs that have uniformly sized particles. Displays made comprising uniformly sized PELCs demonstrate markedly improved electro-optical performance over displays made by conventional polymer dispersed liquid crystal processes.

Particles and droplets containing liquid domains and method for forming in an aqueous medium

Titanium dioxide particles are dispersed in an aqueous medium with a polymeric latex which adsorbs to the surface of the titanium dioxide to give a low-viscosity slurry or pigment grind of composite titanium dioxide-polymeric latex particles. A high glass transition polymeric latex can be used as the dispersant, and a low glass transition temperature binder latex can be added. The zeta potential of the polymeric latex can be at least about 30 millivolts more negative than the zeta potential of the titanium dioxide. The adsorbed polymeric latex provides more optimal spacing of the titanium dioxide particles in films formed from coating compositions formulated using the composite particles, and consequently greater film opacity and hiding at a given pigment volume concentration. Coatings formulated using the composite particles can be prepared to give the same hiding as coatings including titanium dioxide dispersed with conventional polyelectrolyte pigment dispersants, but with lower levels of costly titanium dioxide. Alternatively, a single selected polymeric latex can be used to both strongly adsorb to the pigment particles and to serve as binder, or a mixture of a selected, strongly adsorbing polymeric latex having a low effective glass transition temperature and a conventional binder latex can be employed.

Process for preparing an aqueous dispersion of composite particles

Particles and droplets containing liquid domains and method for forming

Method for forming pluralities of droplets and polymer particles having

Droplets and particles containing liquid crystal and films and apparatus

Inorganic material particles are dispersed in an aqueous medium with surface charge adjusting additives to give a moderately stable slurry or pigment grind. The dispersion can be used to prepare fully formulated compositions. Products formulated using the aqueous dispersion can be prepared to give the same performance as products including inorganic material dispersed with conventional polyelectrolyte pigment dispersants, but with higher levels of inorganic material, or superior performance properties with like levels of inorganic material.

Process for preparing an aqueous dispersion

A method for achieving the maximum film gloss of a dried film of a waterborne coating composition, or paint, is provided. The waterborne coating composition contains a predominant pigment and two emulsion polymers, the three particulate components having certain relative amounts and size relationships to one another.

Method for providing maximum coating film gloss

This invention relates to a non-aqueous coating composition and a method for reducing the drying time of a non-aqueous coating composition by incorporating composite polymer particles having a softer, insoluble first stage and a hard second stage without adversely affecting the viscosity and pot life of the liquid coating composition and without degrading the properties of the final dry coating, including color, flexibility, impact resistance, gasoline resistance, salt spray resistance and humidity resistance.

Coating compositions incorporating composite polymer particles

Novel thickening agents, useful for thickening non-aqueous solvent-containing compositions, are provided. The thickening agents are the reaction product of a polyol containing at least two hydroxyl groups; a polyisocyanate containing at least two isocyanato groups; and an active hydrogen compound. A method of thickening non-aqueous systems by admixing with the novel thickening agents is also provided.

Non-aqueous thickening agents

Low levels of surface-active, aliphatic C.sub.16 or greater hydrocarbon-type compounds are used to reduce the rate of evaporation of water from waterborne polymer products such as latex coatings. This increases the wet-edge or open time of the freshly applied coating, improves integrity and adhesion of the dried coating, and reduces skin formation in containers and on application equipment.

Aqueous polymer compositions containing surface-active evaporation

This application concerns compositions comprising a mixture of an air-drying dicyclopentenyl acrylate or methacrylate binder and a granular or particulate aggregate material, which may comprise a hydraulic cement, and is adapted to be formed by casting, extruding, or molding in any fashion into any desired shape and air-drying the resulting shaped article, thereby producing an integral, solid article of unitary mass and structure. The dicyclopentenyl (meth)acrylate may be used as an impregnant, polymerizable in situ, for already formed articles of porous nature, e.g., concrete, wood, pressed boards, and pressed powdered metal, such as iron, aluminum, steel, etc., to reduce the permeability at their surfaces and provide hard, continuous, hydrophobic, wear-resistant, and weather-resistant surfaces thereon.

Method of coating and/or impregnating porous substrates, and products

Disclosed are inks containing compounds of the formula: ##STR1## where --R.sup.1 is --H or --CH.sub.3

Lithographic ink of reduced volatile solvent content for reducing

Method of printing with lithographic ink of reduced volatile solvent

Described herein is a pigment paste for use in an aqueous paint comprising a film-forming latex polymer, a pigment and a dispersant copolymer. Also described is the dispersant copolymer which serves the function of dispersing the pigment in the preparation of the paste and maintaining the dispersion in the paste and paint made therefrom. The dispersant copolymer is such that its complex salt formed with Zn++ and ammonia is water-soluble at a pH of 9.6. The dispersant is a copolymer of an .alpha.,.beta.-unsaturated monovinylidene carboxylic acid and at least one other ethylenically unsaturated monomer. The dispersant is particularly adapted to preparing paste for difficult-to-formulate paints such as paints with reactive pigments and paints requiring high levels of dispersant.

Pigment dispersant for aqueous paints

Growing community of inventors

Doylestown, PA, United States of America

Peter Reeves Sperry