The Dow Chemical Company

Timberline Tool, L.l.c.

Timberwolf Corporation

Willie E Rochefort

Ming-Biann Liu

Peter E Pierini

Kenneth H Green

Reid Henry Bowman

Staci Alix Van Norman

Nicholas Wannenmacher

Kevin Edward Harris

Daniel Bernardo Roitman

Ritchie A Wessling

Chieh-Chun Chau

Ying Hung So

Steven J Martin

Ashish Sen

Lalitha Reddy

Kenneth D Cramer

Katsuhiko Kato

Nicholas Vannemacher

A multi-layered patch including a backing layer, an outer layer, polymer adhesive layers that include a polymer foam and a solvent, and a heating layer that includes a polymer substrate, a heating element and a sensor, and methods of making and using the multi-layered patch.

Multi-layered patch system and method

A multi-layered composite includes a polymer adhesive layer and a polymer support film layer that becomes intimately incorporated with the polymer adhesive layer upon application of heat.

Multi-layered composite system and method

Film composites useful as adhesives for plastic piping are described.

Polyethylene pipe patching systems and methods

Described is a method for preparing a polybenzazole filament which comprises extruding a polybenzazole dope filament, drawing the filament across an air gap, coagulating and washing the filament, and drying the filament, characterized in that a solution of a compound selected from the group consisting of ferrocenes, ruthocene, iodide-, cobalt-, and copper-containing compounds, dyes, and mixtures thereof is contacted with a filament subsequent to the washing step and prior to the drying step. This method provides a means to improve the tensile strength retention of damaged polybenzazole filaments following exposure to sunlight.

Polybenzazole fibers having improved tensile strength retention

A process for coagulating a polybenzazole film which includes contacting a lyotropic polybenzazole dope film that is constrained in at least two directions with a coagulant under conditions such that the polybenzazole polymer separates as a gelled moiety with the structure set such that further removal of solvent will result in no more than a 5% increase in the force necessary to constrain the film.

Process for coagulating and washing lyotropic polybenzazole films

Films made from polybenzazole dopes can quickly be leached to remove polyphosphoric acid and other residual solvents by passing a leaching fluid such as steam through pores in the wet, never dried film. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

Convective leaching of polybenzazole films

Articles (other than fiber) made from polybenzazole dopes can quickly be washed to remove polyphosphoric acid by a combination of initially washing with an acidic liquid and second washing with a hot leaching fluid at at least about 60.degree. C. The process can reach acceptable residual phosphorous levels (1500-2000 ppm) in as little as about 2 or 3 minutes.

Process for coagulation, washing and leaching of shaped polybenzazole

Growing community of inventors

Corvallis, OR, United States of America

Willie E Rochefort