USA As Represented by Secretary of the Navy

Baker Hughes Corporation

United States of America As Represented by the Secretary of the Air Force

Southwest Research Institute

Niraj Vasishtha

Darren E Barlow

Partha P Paul

Herman W Schlameus

Nagesh Sri Kommareddi

David M Bullat

Ryan Dinius

David L Ciminelli

A barrier coating composition includes a polymer material and a structuring agent dispersed in said polymer material, wherein the structuring agent decreases oxygen or water permeability through the polymer material. The barrier coating composition can be used to coat a core component, which can be oxygen or water sensitive, to form a microencapsulated material. The microencapsulated material can be formed by microencapsulation methods, which include atomization or coacervation methods, including forming an oil emulsion of an oil phase and an aqueous phase, the oil phase including the core component and the aqueous phase including the polymer material, adding the structuring agent to one of the oil phase and the aqueous phase, mixing the oil emulsion to form desired particle sizes of the core component, forming the shell component around the core component to form the microencapsulated material, and extracting the formed microencapsulated material from the oil emulsion.

Microencapsulation of oxygen or water sensitive materials

High concentration drag reducing agents may be prepared by microencapsulating and/or macroencapsulating polymer drag reducing agent. The encapsulation may be performed prior to, during, or after the polymerization of monomer into effective drag reducing polymer. If encapsulation is done before or during polymerization, a catalyst may be present, but little or no solvent is required. The result is very small scale bulk polymerization within the capsule. The inert capsule or shell may be removed before, during or after introduction of the encapsulated drag reducer into a flowing liquid. No injection probes or other special equipment is expected to be required to introduce the drag reducing slurry into the liquid stream, nor is grinding (cryogenic or otherwise) of the polymer necessary to form a suitable drag reducing agent.

Microencapsulated and macroencapsulated drag reducing agents

Controlled and thorough stabilization of pitch is provided by incorporating an oxidant into the pitch. In one embodiment of the invention, the oxidant is intimately mixed with the pitch. In another embodiment, the oxidant is encapsulated in a suitable encapsulant and the encapsulated oxidant is intimately mixed with the pitch. This material is particularly useful in the preparation of a carbon-carbon composite, but is also useful for preparing fibers and solid preforms.

Encapsulation of oxidants for pitch stabilization

A biorepellent matrix structure comprises a resin and first and second micapsules suspended in the resin. The first and second microcapsules each includes a first shell and a second shell, respectively, containing a biorepellent material that is released upon penetration of any of the first and second shells, as for example, by a biological organism. The biorepellent material, such as capsaicin, diffuses through the first and second shells at different rates. The different diffusion rates of the biorepellent material together provide a biorepellant matrix structure that exhibits long term protection against the formation of biological organisms that would otherwise accumulate on the matrix structure, and deters organisms from gnawing or chewing the matrix structure.

Biorepellent matrix coating

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San Antonio, TX, United States of America

Niraj Vasishtha