Exxon Research and Engineering Company

Exxon Chemical Patents, Inc.

Agrium, Inc.

Albert J Geiger

Evelyn N Drake

Vijay Swarup

Warren A Thaler

Edward N Kresge

Pacifico V Manalastas

John C Newlove

Lee A McDougall

Chester W Elspass

Dennis G Peiffer

Martin Leo Gorbaty

Eugene Stelmack

Nicolette M Babiak

Frank Shi-Chow Chen

Eugene G Stelmack

A controlled release fertilizer material comprising a particulate plant nutrient surrounded by a coating which is the reaction product of a mixture comprising: a polyol, an isocyanate and an organic wax.

Controlled release fertilizer and method for production thereof

The present invention provides for controlled release chemical compositions having improved controlled release properties wherein core substrate particles comprising a water soluble chemical compound, such as a fertilizer or oil well chemical, which are surrounded and encapsulated by a controlled release coating which is slowly permeable to water, such as a thin layer of polymeric material, are further overcoated with one or more coating layers comprising a finely divided filler preferably talc, dispersed in a metal or ammonium lignosulfonate binder. The outer coating serves to protect the underlying, thin film, controlled release coating from abrasion and impact damage occasioned by packaging, blending and dispensing equipment, thereby preserving the water permeating properties designed into such coating. The outer protective coating is itself permeable to water, allowing the layer beneath it to control the rate of water contact with the substrate core and subsequent release of the core substance into its environment.

Abrasion resistant topcoats for control release coatings

There is provided a coated agricultural substrate in which the coating comprises a blend of a neutralized sulfonated ionomer and asphalt. Preferably, the coating contains from about 1 to 20 wt. % asphalt and from 99 to 80 wt. % of the neutralized sulfonated ionomer. In a particularly preferred embodiment of the present invention, the coating contains about 7 wt. % asphalt and about 93 wt. % of the neutralized sulfonated ionomer.

Sustained release agricultural substrate coated with a blend of EPDM and

A composite comprising a urea substrate and ionically and covalently crosslinked, neutralized, sulfonated EPDM elastomeric coating encapsulating the urea.

Coatings with ionically and covalently crosslinked sulfonated polymers

A composite comprising a substrate and a polymeric coating adhered to at least one surface of said substrate, said polymer coating having a thickness of about 1 to about 100 micrometers, wherein said polymer coating comprises an ionically and covalently crosslinked neutralized carboxylated polymer having a carboxylate content of about 5 to about 300 meq. per 100 grams of said ionically and covalently crosslinked neutralized carboxylated polymer.

Coatings with ionically and covalently crosslinked neutralized

An encapsulated breaker chemical composition used in an oil or gas stimulation operation which comprises: a breaker chemical; and a pinhole free coating of an ionically and covalently crosslinked neutralized sulfonated elastomeric polymer of about 2 to about 80 microns thick deposited onto the surface of the breaker chemical, wherein said polymer encapsulates the breaker chemical, wherein the polymer is permeable to the breaker chemical and the polymer is non-reactive to the breaker chemical.

Composition comprising encapsulated substrate with thermoplastic polymer

An encapsulated breaker chemical composition used in an oil or gas stimulation operation which comprises: a breaker chemical; and a pinhole free coating of an ionically and covalently crosslinked neutralized sulfonated elastomeric polyer of about 2 to about 80 microns thick deposited onto the surface of the breaker chemical, wherein said polymer encapsulates the breaker chemical, wherein the polymer is permeable to the breaker chemical and the polymer is non-reactive to the breaker chemical.

Growing community of inventors

Fort, Canada

Albert J Geiger