Rohm and Haas Company

Ronald W Novak

Clarence J Neyhart

Robert Mitchell Blankenship

George H Redlich

Martin Vogel

Frederick James Schindler

Ronald Scott Beckley

Martha H Wolfersberger

Sidney Melamed

William D Emmons

David Richard Amick

Thomas W Hutton

Alexander Kowalski

Benjamin B Kine

Leslie R Wolf

The present invention is concerned with core and shell polymeric particles having microvoids in the core and one or more channels connecting the microvoids to the exterior of the particle. These particles, or LCAPs are produced by forming a core of polymeric acid, encasing the core in a shell polymer permeable to base, and then neutralizing the core such that the core swells, causing the shell to 'explode' in a controlled fashion. This controlled explosion causes channels to form in the shell. These particles can be used as control release devices for target compounds, to impart reinforcing properties to acrylic films, as an opacifying agent in coating compositions, and as a supplement or replacement of part or all of the pigmentary material or extenders that would otherwise be used in such coating compositions.

Synthesis of latex capsules

An aqueous, radiation-curable, functionalized latex polymer composition and its preparation are disclosed. The composition is a multistaged latex polymer formed from a first stage polymer and a second stage polymer having .alpha., .beta.-unsaturated carbonyl functionalization which permits curing by UV radiation. The composition dries tack-free before curing. The final cured UV coating has excellent solvent resistance, water resistance, stain resistance, direct impact resistance and hot print resistance. The composition is useful in coatings, adhesives, inks and leather coatings, and is particularly useful as a coating on wood. The multistaged latex polymer is made by

Functionalized multistage polymers

A method for solidification or encapsulation of compositions containing a substantially continuous aqueous phase comprising uniformly incorporating into said compositions core-shell polymer particles and subsequently neutralizing said polymer particles by incorporating into said compositions an organic or inorganic base. The neutralized polymer particles swell and absorb substantially all of said aqueous phase.

Method for solidification and encapsulation using core-shell polymer

The present invention relates to a sequential polymerization process for preparing a water-insoluble dispersion of core/shell particles. In one embodiment the process may be employed to produce a particulate dispersion useful in making water-based coating compositions wherein on drying the particulate dispersion serves as an opacifying agent. In another embodiment the process may be employed to microencapsulate a hydrophobic target material, such as a biocide or herbicide.

Solvent core encapsulant composition

A low-formaldehyde polymer latex composition includes a formaldehyde-scavenging agent selected from

Low-formaldehyde, self-crosslinking polymer latex composition

Microsuspension process for preparing solvent core sequential polymer

Oxygen scavengers, especially for vinyl polymerizations, comprising an aldehyde or imine of the formula

Aldehyde or imine oxygen scavengers for vinyl polymerizations

Two stage film-forming polymers having a soft first and a hard second stage are prepared by emulsion polymerizing the first stage and then, in the presence of a coalescent, the second stage. The polymers combine low MFT with superior early block resistance and high temperature hardness.

(Meth)acrylate film-forming polymers prepared with an in process

The specification discloses a polymer of ethylenically unsaturated monomers wherein the polymer comprises diamide mer units having pendant unsaturated, air-curable alkyl groups. Methods of making and using the polymers and articles made therefrom are taught. The polymer may be used in coating, bonding or adhering to substrates. Of particular importance are uses in paint compositions and in caulk compositions. The air-curable alkyl diamide mer unit is derived from an unsaturated drying oil. Aqueous coating compositions are disclosed in which the polymer is an ammonia or amine salt, in solution, and is either the sole polymeric vehicle or is combined with a water insoluble polymer latex.

Addition polymer comprising air-curable alkyl diamide

The specification discloses a polymer and the method of using the same to prepare articles of manufacture, the composition comprising a water-soluble salt of a polymer containing pendant groups derived from an unsaturated drying oil fatty acid hydroxyamide, carboxy groups, carboxy ester groups and optionally the residues of other unsaturated addition polymerizable monomers, the carboxy units being present in a critical amount and the polymer having a critical glass transition temperature, molecular weight and the like. Aqueous coating compositions are disclosed in which the soluble polymer is either the sole polymeric vehicle or is combined with a water-insoluble polymer latex.

Water-soluble air-oxidizing acrylic coatings

It has been discovered that the adhesion of latex coatings to concrete surfaces can be significantly improved by prior treatment of the surface with an air curable, water soluble polymer. Preferred water soluble polymers cure oxidatively in a manner similar to drying oils.

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Chalfont, PA, United States of America

Ronald W Novak