1
John L Nafziger, Steven B Lowenkron, Charles E Koehler, Debkumar Bhattacharjee: Rigid foams prepared from treated toluene diisocyanate residue. The Dow Chemical Company, Carol J Cavender, February 27, 1990: US04904704 (12 worldwide citation)

A method of treating toluene diisocyanate distillation residues comprising reacting the residues with at least about 0.5 equivalents, based on hydrolyzable chloride concentration of the residues, of an epoxy compound at a temperature of from about 155 to about 220.degree. C. to produce a treated dis ...


2
John N Argyropoulos, Paul Foley, Debkumar Bhattacharjee, Bedri Erdem: Polyurethane dispersion and articles prepared therefrom. Dow Global Technologies, June 19, 2007: US07232859 (7 worldwide citation)

The present invention is to a polyurethane dispersion and products produced therefrom wherein the dispersion contains a polyurethane prepolymer produced from the a reaction of an excess of a polyisocyanate with an isocyanate reactive molecule wherein the polyisocyanate is a bis(isocyanatomethyl)cycl ...


3
William A Koonce, Franklin E Parks, Debkumar Bhattacharjee: Polyurethane films prepared from polyurethane dispersions. The Dow Chemical Company, September 17, 2002: US06451908 (5 worldwide citation)

A process for preparing a polyurethane film comprising two steps is disclosed. The first step comprises preparing a nonionic prepolymer formulation, the prepolymer formulation comprising a diisocyanate, an active hydrogen containing material, and a monol. The second step comprises preparing an aqueo ...


4
Debkumar Bhattacharjee, Dwight D Latham, Gilbert L Nelson: Use of bo polyols to improve compatibility of pentane and cyclopentane in rigid polyurethane foams. The Dow Chemical Company, November 27, 2001: US06322722 (4 worldwide citation)

The present invention is a polyol mixture that is useful for preparing polyurethane and polyisocyanurate foams. The polyol mixture of the present invention includes: a polyol that is derived from butylene oxide; and a hydrocarbon blowing agent such as pentane or cyclopentane, for example. Use of but ...


5
Debkumar Bhattacharjee, Jerram B Nichols, Warren A Kaplan, Vaughn M Nace: Polyisocyanate based polymers perpared from formulations including non-silicone surfactants and method for the preparation thereof. The Dow Chemical Company, February 4, 1997: US05600019 (4 worldwide citation)

Polyurethane, polyisocyanurate and polyurea polymers, particularly foamed polymers can be prepared from formulations including non-silicone polyether surfactants. The non-silicone polyether surfactants can be polyethers having from about 10 to about 90 weight percent oxyethylene units and from about ...


6
Friederike Stollmaier, Dwight D Latham, Michael J Elwell, Debkumar Bhattacharjee, Bedri Erdem: Solvent free polyurethane dispersions for hard surface coatings. DowGlobal Technologies, July 13, 2010: US07754809 (3 worldwide citation)

The invention relates to polyurethane dispersions which develop high hardness and form coating films at room temperature. The dispersions are prepared from prepolymers containing prepolymers containing a polyol or polyol blend having specified equivalent weight and polyisocyanate to polyol molar rat ...


7
William A Koonce, Debkumar Bhattacharjee, Michael Y Gribble, James A McIntyre: Polyurethane films prepared by electrodeposition from polyurethane dispersions. Dow Global Technologies, February 4, 2003: US06514572 (3 worldwide citation)

A process for preparing polyurethane films is disclosed, comprising electrodepositing the film onto a substrate from a polyurethane dispersion. One advantage of the electrodeposition process of the present invention is that there is no need for an additional step to remove coagulants from the films, ...


8
Jeffrey R Anderson, John N Argyropoulos, Debkumar Bhattacharjee, Paul Foley, Gary E Spilman, Huiqing Zhang: Ambient temperature curable isocyanate-free compositions for preparing crosslinked polyurethanes. Dow Global Technologies, Andrew E C Merriam, February 18, 2014: US08653174 (3 worldwide citation)

The present invention provides a multicomponent composition that is substantially isocyanate-free and comprises a polycarbamate as a first component and a polyaldehyde or an acetal or hemiacetal thereof as a second component and further comprises an effective amount of a triggering agent such that t ...


9
Erdem Bedri, Debkumar Bhattacharjee, John N Argyropoulos: Prepolymers made from hydroxymethyl-containing polyester polyols derived from fatty acids. Dow Global Technologies, Whyte Hirschboeck Dudek S C, December 3, 2013: US08598297 (2 worldwide citation)

Prepolymers are prepared by a reaction of a polyisocyanate and a hydroxylmethyl containing polyester polyol derived from a fatty acid. The prepolymers can be prepared having isocyanate, hydroxyl, or a variety of other reactive functional groups. The prepolymers are useful in making polyurethanes and ...


10
Benjamin W Tucker, Debkumar Bhattacharjee: Rigid polyurethane foams with low thermal conductivities. The Dow Chemical Company, April 16, 1991: US05008299 (2 worldwide citation)

Disclosed are rigid cellular polyurethanes prepared by bringing together under foam forming conditions an aromatic polyisocyanate and a polyhydric combination comprising a major proportion of a crude polyester polyol and minor proportion of a cross-linking polyol. This selection of particular ingred ...