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US 4,880,622 AGranted
Water-soluble phosphazene polymers having pharmacological applications
AssigneeResearch Corporation Technologies, Inc.
InventorsHarry R. Allcock, Paul E. Austin, Sukky Kwon
Life of this patent
Estimating the term…
Abstract
Novel poly(organophosphazene) polymers are used for the controlled release of pharmaceuticals, pesticides, herbicides, plant growth regulators and fertilizers. These polymers also act as foam control agents.
Claims6
A controlled release article of manufacture comprising a member selected from the group consisting of pharmaceuticals, pesticides, herbicides, plant growth regulators, and fertilizers in a physical admixture with a matrix of a polymer of the formula:
- [NPR(R.sub.2)]n
- wherein (a) R is selected from the group consisting of lower alkoxy ethers or polyethers, imines, polyimines, sulfides, polysulfides, esters and polyesters, and (b) n is from about 10 to about 20,000.
Dependencies are inferred from the claim text.