The Dow Chemical Company

Frank L Saunders

Ronald R Pelletier

Robert L McGee

Theodore E Miller, Jr

Victor E Meyer

Douglas E Leng

Ralph E Friedrich

Gordon D McCann

Donald A Kangas

David J Nowak

Wilmer L Sigelko

The specification discloses a method and apparatus for determining the gel time of thermoset resins by using a disposable vial, a disposable spindle for insertion into the vial, a locking collar releasably secured to the disposable vial for mounting the vial in a permanent sample cup and holding it against rotation with respect thereto, and a spindle adaptor releasably receiving the disposable spindle for mounting same to the spindle mount of a conventional viscometer. The thermoset resin is located in the disposable vial along with the disposable spindle. The permanent sample cup including the disposable vial and its contents is located in a heater and the spindle adaptor is secured to the spindle mount of the viscometer. The viscometer is operated and the gel time is determined as the length of time it takes until the viscosity of the heated resin sample begins to increase sharply.

Apparatus for determining resin gel time

A disposable flow cell for use in a thermal pulse flow meter of the type that incorporates a pulse heated thermal probe and a detecting thermal probe. The disposable cell has two side ports covered with a stretchable film barrier. The thermal probes extend into the flow cell through the ports stretching the barrier ahead of them so that the probes can transmit and then detect thermal pulses to a fluid flowing through the flow cell while at the same time maintaining isolation between the probes and the fluid. The invention is also a thermal pulse flow meter incorporating the above cell.

Thermal pulse flow meter with disposable cell

Substrates of metal, glass, plastic and the like are effectively bonded together with an adhesive composition which is the reaction product of an organic polyisocyanate such as 4,4'-methylenediphenyl diisocyanate, a solution of copolymer of an alkyl ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid and a hydroxyalkyl ester of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid in a polyahl having a molecular weight of 200 or greater such as polypropylene glycol and a low molecular weight polyahl such as ethylene glycol.

Polyurethane-type adhesives containing nonaqueous solutions of acrylate

Aqueous dispersions of water-insoluble polymers employ fatty acid salts as plasticizers/stabilizers. These dispersions may be coagulated by adjusting the pH until the fatty acid salts are converted to free acid form.

Aqueous dispersions of plasticized polymer particles

High density thermoset foams of acrylic polymers are prepared by dry mixing a hydroxy-functional acrylic polymer, e.g., a copolymer of styrene, ethyl acrylate, hydroxy alkyl acrylate and acrylic acid, with a crosslinking agent, e.g., a melamineformaldehyde condensate, and then subjecting the resulting mixture to conditions sufficient to cause the mixture to foam and to crosslink to a thermoset material.

Process of making thermoset foams of acrylic polymers

Lacquers of crosslinkable polymers are prepared by an improved process wherein a monomer composition of an olefinically unsaturated carboxylic acid, a hydroxyalkyl acrylate and at least one other monomer from the group of alkenyl aromatic monomers, alkyl acrylates or mixtures thereof is dissolved in tetrachloroethylene or 1,1,1-trichloroethane or mixtures thereof and caused to polymerize.

Crosslinkable polymer coating compositions and process for preparing the

Polymer blends having high impact resistance after mechanical working are produced by blending together a non-elastomeric monovinylidene aromatic polymer such as polystyrene with an elastomeric copolymer, such as a block copolymer of styrene and butadiene, in the form of crosslinked, colloidal size particles.

Cross-linked block copolymer blends with improved impact resistance

A stable, aqueous composition comprising an electroconductive resin, e.g., poly (vinylbenzyl trimethyl ammonium chloride), and a latex of an organic polymer stabilized by cationic moiety is applied as a coating to a non-conductive substrate such as paper or a plastic film to provide an article having decreased surface electrical resistivity and increased resistance to organic solvents. Such compositions are particularly useful in the manufacture of electrographic printing papers.

Electroconductive coating composition containing cationic latexes

The tester comprises basically a four wheeled carriage, a scale arm containing graduations attached to the carriage in a counterpoised condition about a pivot axis, and a rolling, round fluted cutting tool coupled to the carriage and to the scale arm. The cutting tool, as the carriage is drawn across a test surface, leaves an indented track of the cutting flutes. The width of the track marks is a function of the coating hardness and applied load.

Growing community of inventors

Midland, MI, United States of America

Frank L Saunders