Rohm and Haas Company

Other

William D Emmons

Peter Reeves Sperry

Kayson Nyi

Daniel Arthur Bors

Andrew W Gross

Wayne E Feely

Travis E Stevens

Andrew J Kielbania, Jr

Fred A Kaplan

Graham Swift

Dennis Paul Lorah

Mark Robert Winkle

David Richard Amick

Martin Vogel

Alvin C Lavoie

Edward Charles Kostansek

Donald A Winey

Steven Scott Edwards

George H Redlich

Jerome F Levy

Joseph A Lavelle

Jack C Thibeault

Vincent J Moser

Dominic R Falgiatore

Frederick J Hirsekorn

Gary Robert Larson

William Christopher Finch

Palaiyur S Kalyanaraman

Ronald W Novak

Chao-Jen Chung

Nicholas A Rounds

Charles E Warburton, Jr

John G Brodnyan

Samuel S Kim

Meredith Ann Morgan

Norman Shachat

Federick J Hirsekorn

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

An air-curing composition is disclosed which contains an acetoacetate functional polymer and an end-blocked polyformaldehyde chain. The composition is stable to reaction until the formaldehyde is released from the polyformaldehyde chain.

Shelf stable compositions containing acetoacetate functional polymer and

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

This invention relates to a method for light-assisted curing of coatings by providing coatings with an enamine content sufficient to enhance the cure rate of the coatings. The coatings exhibit improved weatherability and gloss retention when exposed to light.

Method for light-assisted curing of coatings

An air curing polymer composition is disclosed which contains acetoacetate functional polymer and an autoxidizable material. The composition cures on exposure to oxygen. One pack stable ambient curing compositions and a method of stabilizing acetoacetate functional groups to prevent hydrolysis are also disclosed.

Air curing polymer compositions

This invention relates to a block copolymer comprising: a) at least one first block of polymerized units of at least one first ethylenically unsaturated monomer and at least one latent thiol mercaptan chain transfer agent wherein the latent thiol mercaptan chain transfer agent has the general formula; ##STR1## wherein A is a polyvalent organic radical; x and y are positive integers such that x+y equals the valence of A; B is an organic acyl radical; and n and m are integers from 1 to 6; and b) at least one second block of polymerized units of at least one second ethylenically unsaturated monomer, wherein said at least one second block is attached to said at least one first block by reacting with terminal thiol functional groups contained on said at least one first block. In addition, this invention relates to the method of making this block copolymer.

Block copolymers containing latent thiol mercaptan chain transfer agents

This invention relates to a polymer composition of a block copolymer dispersed in water wherein the block copolymer is composed of: a) at least one first block of polymerized units of at least one first ethylenically unsaturated monomer and at least one latent thiol mercaptan chain transfer agent wherein the latent thiol mercaptan chain transfer agent has the general formula; ##STR1## wherein A is a polyvalent organic radical; x and y are positive integers such that x+y equals the valence of A; B is an organic acyl radical; and n and m are integers from 1 to 6; and b) at least one second block of polymerized units of at feast one second ethylenically unsaturated monomer, wherein said at least one second block is attached to said at least one first block by reacting with terminal thiol functional groups contained on said at least one first block.

Compositions containing block copolymers composed of latent thiol

Air curing polymer composition

A coating or impregnating composition containing an aqueous dispersion of a vinyl addition polymer and a reactive coalescent is provided. The reactive coalescent contains at least one acetoacetate grouping, or an enamine thereof. In one embodiment the reactive coalescent also functions as an emulsion polymer crosslinker.

Reactive coalescents

This invention relates to latent thiol mercaptan chain transfer agents and their use in the synthesis of polymers. In addition, this invention relates to novel polymers and block copolymers formed using these latent thiol mercaptan chain transfer agents.

Latent thiol mercaptan chain transfer agents and their use in the

Coatings compositions including stable composite latex-pigment particles are prepared by dispersing titanium dioxide pigment particles in a first aqueous medium and preparing a dispersion of selected polymeric latex particles, which have at least one dihydrogen phosphate functional group, in a second aqueous medium. The media are mixed and the selected polymeric latex particles adsorb on the titanium dioxide particles. Dibasic phosphate is then provided to the mixture to stop adsorption and stabilize the composite particles. The coating composition gives a coating with improved hiding.

Process for controlling adsorption of polymeric latex on titanium dioxide

This invention relates to latent thiol monomers and their use in the synthesis of polymers. In addition, this invention relates to novel polymers and graft copolymers formed with these latent thiol monomers.

Polymers containing latent thiol monomers

This invention relates to a two stage aqueous emulsion polymerization process for making graft copolymers. In the first stage, at least one first ethylenically unsaturated monomer is polymerized in the presence of at least one mercapto-olefin compound to form a macromonomer with terminal functional groups. In the second stage, at least one second ethylenically unsaturated monomer is polymerized in the presence of the macromonomer such that a copolymer is formed with a backbone of polymerized units of the at least one second ethylenically unsaturated monomer and side chains of the macromonomer.

Graft copolymers prepared by two staged aqueous emulsion polymerization

Growing community of inventors

Huntingdon Valley, PA, United States of America

William D Emmons