Henkel Ag & Company, Kgaa

Henkel Kommanditgesellschaft Auf Aktien

Henkel IP Holding Gmbh

David Sturgill

Corina Bisog

Rainer Schoenfeld

Rajat K Agarwal

Jeng-Li Liang

Robert E Mammarella

Scott L Hartsell

Joshua Harju

Kazuhiko Sato

Disclosed is a heat curable solvent free plastisol composition that exhibits very low volatile organic compound amounts while maintaining high performance characteristics. The present plastisol compositions have solvent substitutes used at amounts up to 15% by weight based on the total composition weight. The solvent substitutes have very low vapor pressures, stable viscosity effects, and are fusible with the plastisol polymers. These solvent substitutes can be used to replace the typical solvents without requiring extensive re-formulation of the plastisol composition. The final plastisol compositions according to the present invention exhibit low VOC measures of less than 0.03 pounds per gallon when measured according to EPA Method 24.

Solvent free vinyl plastisol composition

Disclosed is method of preparing microspheres wherein the microspheres do not increase the self-extinguishing time of a composition they are added to by more than 5% and their presence does not increase a viscosity of the composition by more than 65%. The microspheres are coated with a very high level of from 80 to 90% by weight of a flame retardant, preferably aluminum trihydroxide. Unexpectedly, the presence of the flame retardant on the microspheres at this high level reduces the need to add additional flame retardant to a composition along with the microspheres. Also unexpectedly, the location of the flame retardant on the microspheres completely prevents the normally expected increase in viscosity of the composition based on the level of the flame retardant added. The microspheres find use in many compositions requiring flame resistance including weld through sealants and adhesives.

Use of hollow polymeric microspheres in composite materials requiring flame resistance

This invention relates to compositions useful as adhesives and more particularly to the preparation of heat-curable epoxy-based adhesive compositions that are resistant to being washed off substrate surfaces prior to being cured. The incorporation of a solid diene-based rubber, in particular an acrylonitrile-butadiene copolymer rubber having a relatively high Mooney viscosity, significantly enhances the wash-off resistance of the adhesive, while still allowing the adhesive to be readily dispensed by pumping under high shear conditions.

Epoxy-paste adhesives resistant to wash-off

Blocked polyurethane prepolymers obtained by reacting at least one polyol, a first polyisocyanate comprising diphenylmethane diisocyanate, a second polyisocyanate having a viscosity at 25&#xb0; C. of less than about 250 mPa&#xb7;s, a phenol blocking agent, and an oxime blocking agent, wherein the weight ratio of second polyisocyanate:first polyisocyanate is not more than 0.65:1. The blocked polyurethane prepolymers are especially useful in formulating coating compositions additionally comprising at least one acrylic resin, at least one plasticizer, at least one filler, and optionally other ingredients and additives. A cured coating is obtained by applying a layer of the coating composition to a substrate surface and heating the coating composition layer.

Blocked polyurethane prepolymers useful in coating compositions

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Brookfield, WI, United States of America

David Sturgill