Dow Corning Corporation

John T Woodard

Patrick J Miller

Martin C Musolf

Virgil L Metevia

Linda J McInally

Aqueous coating compositions for forming elastomeric films around active cores (e.g., drugs) comprising a dispersion of pre-crosslinked polyorganosiloxane latex particles, colloidal silica particles, and a water-dispersible organic material (e.g., polyethylene glycol) are disclosed and claimed. The elastomeric films formed by the coating compositions are used to control the rate of release of an active agent in the cores into an aqueous environment. Methods of formulating the coating compositions and active cores coated with the coating compositions are also disclosed.

Coated active agent-containing article

Aqueous film-forming compositions for controlling the release of active

Process for forming a coated active agent-containing article

A composition and method for forming elastomeric pressure sensitive adhesives comprising a mixture of (A) a xylene-soluble resin copolymer of 0.6 to 0.9 triorganosiloxy units per SiO.sub.4/2 unit and having less than 0.7 weight % silicon-bonded hydroxyl units. (B) a polydiorganosiloxane fluid endcapped with silicon-bonded hydroxyl groups and having a viscosity of from about 50 to 300,000 cP. at 25.degree. C., an organosilicon compound containing an average of more than two silicon-bonded alkoxy groups per molecule, and a condensation catalyst. The cured elastomeric pressure sensitive adhesives formed from these compositions are useful as medical adhesives, such as those used for ostomy seals.

Moldable elastomeric pressure sensitive adhesives

This invention relates to an improved transdermal drug delivery device for the controlled transdermal delivery of amino-functional drugs. The improvement resides in providing the device with a silicone pressure-sensitive adhesive layer which has been chemically treated to reduce the silicon-bonded hydroxyl content of the pressure-sensitive adhesive composition to render the adhesive layer resistant to loss of tack and preserve the instant adherence of the device to the skin of a wearer during storage and while the device is being worn. Preferably, the composition used comprises a silicon-bonded hydroxyl radical containing resinous copolymer of R.sub.3 SiO.sub.1/2 units and SiO.sub.4/2 units and a polydiorganosiloxane which have been chemically treated with R.sub.3 SiO.sub.1/2 units where R is preferably a hydrocarbon radical such as a methyl group to reduce the silicon-bonded hydroxyl content of the adhesive and thereby its sensitivity to amino-functional drugs.

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Midland, MI, United States of America

John T Woodard