The Dow Chemical Company

Other

Dow Global Technolgoies LLC

James W McMichael

Yu-Min Tsou

Robert D Door

Bruce D Hook

Malcolm F Finlayson

Shrikant Dhodapkar

Jorg Theuerkauf

Richard N Beaver, Deceased

Friedhelm Bunge

Jeffrey R Montanye

Jeffrey Richard Montayne

Friedheim Bunge

Richard N Beaaver, Deceased

Shirkant V Dhodapkar

Thomas J Pisklak

Shrikant V Dhodapkar

Joerg Theuerkauf

Modifying agents, e.g., a poly(sulfonyl) azide, are attached to a substrate surface, e.g., the surface of a polyolefin particle, by a process comprising the steps of: A. Contacting in an open contact zone and under a flow of inert gas a substrate with a modifying agent, binding agent, e.g., a phenolic-based antioxidant, and a liquid mixing agent, e.g., methylene chloride, to form a substrate mixture; B. Closing the contact zone and stopping the flow of inert gas to the contact zone; C. Agitating the substrate mixture under the inert gas in the closed contact zone to commence evaporation of the liquid mixing agent; D. Reducing the temperature and pressure of the closed contact zone while continuing to agitate the substrate mixture; and E. Completing the substantial evaporation of the mixing agent from the substrate mixture by opening the contact zone and initiating an inert gas flow while continuing agitation of the substrate mixture and maintaining a reduced pressure.

Process for attaching a modifying agent to a substrate

The present invention relates to substantially free-flowing polymer particles. The polymer particles are those which have a one millimeter penetration temperature of less than about 75&#xb0; C. as determined by thermal mechanical analysis or an unconfined yield strength of greater than about 15 pounds per square foot (73 kilograms per square meter). The composition also comprises an effective amount of an anti-blocking agent in the presence or absence of a binding agent.

Free-flowing polymer composition

A membrane-electrode structure for use in an electrochemical cell comprising an ion exchange membrane with a cathode layer and several intermediate layers between the cathode and the membrane. The intermediate layers comprises at least two layers or zones of inorganic solid particles and an organic polymer binder. The intermediate layer or zone adjacent to the membrane comprises more than 50% by weight of inorganic particles and the other layers or zones have 50% by weight or less of inorganic particles.

Membrane-electrode structure for electrochemical cells

A membrane-electrode structure for use in an electrochemical cell comprising an ion exchange membrane with a cathode layer and an intermediate layer between the cathode and the membrane. The intermediate layer comprises about 5 to 80% by weight of inorganic solid particles and about 95 to 20% by weight of an ionic conductive polymeric binder.

The invention is a membrane/electrode combination comprising: an ion exchange membrane having a plurality of interconnected roadways of catalytically active particles bonded to at least one face of the membrane.

Membrane/electrode combination having interconnected roadways of

The invention is a membrane/electrode combination having an electrically conductive screen which has a first and a second face. At least the first face of the screen is substantially flat. The screen has a plurality of openings passing therethrough and connecting the first and the second faces of the screen. The openings occupying up to about 75% of the surface area of each face of the electrically conductive screen. The first face of an ion exchange membrane film, which has a first and a second face, is attached to the first face of the electrically conductive screen, thereby leaving portions of the first face of the membrane film exposed through the openings in the electrically conductive screen. A plurality of catalytically active particles are disposed on the exposed portions of the first face of the membrane film in electrical and physical contact with the membrane and with the electrically conductive screen.

Method for making an improved supported membrane/electrode structure

A method and apparatus for installing a sheet membrane in an electrolysis cell is disclosed. In the procedure, a rectangular sheet is first soaked in a selected wetting liquid preliminary to installation, one edge of the rectangular sheet is grasped in a lengthwise rigid releasable clamp, that edge is then positioned through a slot to extend the sheet member from a transport cylinder whereupon the sheet is rolled around the cylinder. This leaves an exposed marginal edge on the sheet which is clamped in a second and similar clamp. This then enables the sheet to be transported and positioned above a slot where the sheet is unrolled and positioned through the slot into an electrolysis cell. Suitable apparatus is also disclosed.

Method and apparatus for installing a large, planar, delicate membrane

The invention is a membrane/electrode combination having an electrically conductive screen which has a first and a second face. The first face is substantially flat and the screen has a plurality of openings passing through it. The openings connect the first and the second faces of the screen and occupy up to about 75% of the surface area of each face of the electrically conductive screen. There is also an ion exchange membrane film having a first and a second face. The first face of the membrane film is attached to the first face of the electrically conductive screen, thereby leaving portions of the first face of the membrane film exposed through the openings in the electrically conductive screen. A plurality of catalytically active particles are disposed on the exposed portions of the first face of the membrane film and are in electrical and physical contact with the membrane and with the electrically conductive screen.

Supported membrane/electrode structure combination wherein catalytically

The invention is a method for making an improved membrane/electrode combination by at least partially coating at least a portion of a first face of a screen template with a plurality of catalytically active particles, where the substantially flat screen has the first face, a second face, and a plurality of openings passing therethrough which connect the first and the second faces of the screen. The openings occupy up to about 75% of the surface area of each face of the screen template. The coated face of the screen template is contacted with an ion exchange membrane. The catalytically active particles are transferred from the screen template to the membrane and the particles are bonded to the membrane.

Growing community of inventors

Lake Jackson, TX, United States of America

James W McMichael