Dupont Canada Inc.

E.i. Dupont De Nemours and Company

Kenneth Earl Stevens

Arthur Z Moss

Michael Cregg Coughlin

Anthony Joseph Cesaroni

Pallatheri M Subramanian

Shailesh Ratilal Doshi

Gordon James Clarke

Enrico Simonato

Myron Bruce Babcock

Maurizio Parrino

Alberto Mannoni

Mahender Kumar Khurana

Heat exchangers which have heat exchange structures made from at least one layer of an isotropic polymer and at least one layer of a thermotropic liquid crystalline polymer are particularly useful where light weight is important, such as in automobiles, trucks and aircraft.

Heat exchangers containing liquid crystalline polymer layers

A heat exchanger comprising plates of thermoplastic tubes arranged in a way which minimizes the thermal resistance at the outer surface of the tubes preferably to not more than 5 times the resistance to heat transfer at the inside of the tubes. The tubes are arranged in the tube plates in groups that can be flat or slightly wavy, such as undulating in a periodic manner, or offset with open spaces facing groups of tubes in alternating rows. This is done in a way that maximizes turbulence outside the tubes and minimizes vortices which can trap coolant in the interstices between tubes.

Heat exchanger with tube plates

A film having a porous core layer and nonporous outer layers is made from a composition of certain polymers, particularly ethylene polymers, a particulate filler which has little affinity for the polymer, and optionally an organic compound which decreases the tendency for affinity of the particulate for the polymer. The film is produced by extruding the composition through a die gap of at least 250 .mu.m, and subsequently stretching the film after cooling to a temperature below the melting temperature of the polymer.

Process for making a heterogeneous membrane film

A film having a porous core layer and nonporous outer layers is disclosed. It is suitable for controlled atmosphere packaging end uses. The film is made from a composition of certain polymers, particularly ethylene polymers, a particulate filler which has little affinity for the polymer, and optionally an organic compound which decreases the tendency for affinity of the particulate for the polymer. The film is produced by extruding the composition through a die gap of at least 250 .mu.m, and subsequently stretching the film after cooling to a temperature below the melting temperature of the polymer.

Heterogeneous membranes from highly filled thermoplastic orientable

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Kingston, Canada

Kenneth Earl Stevens