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US 5,256,181 AGranted
Coatings with ionically and covalently crosslinked sulfonated polymers
AssigneeExxon Research & Engineering Co.
InventorsPacifico V. Manalastas, Evelyn N. Drake, Warren A. Thaler, Edward N. Kresge, Chester W. Elspass, Albert J. Geiger, Vijay Swarup
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Abstract
A composite comprising a urea substrate and ionically and covalently crosslinked, neutralized, sulfonated EPDM elastomeric coating encapsulating the urea.
Claims9
A composite comprising (a) a fertilizer substrate and (b) an ionically and covalently crosslinked, neutralized sulfonic elastomeric coating for said substrate having a thickness of about 1-100 micrometers wherein the elastomeric coating is selected from the group consisting of:
- (i) sulfonated polymers having a sulfonate content of about 4-200 meq./100 grams of neutralized sulfonate polymer, and
- (ii) an interpolymeric complex of a sulfonated polymer and an amine containing polymer, having a sulfonate content of about 4-100 meq./100 grams of sulfonated polymer and wherein the nitrogen content of the basic nitrogen atoms ranges from about 4-50 meq./100 grams of amine containing polymer.
Dependencies are inferred from the claim text.