Sprayable water-based adhesive
AssigneeHenkel AG & Co. KGaA
InventorsRobert W. Rowitsch, Jeffrey Cash, Michael Maue, Daniel J. Lovullo, Brian J. Stachowski, Michael Kasprzak, Richard W. Johnston
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Abstract
Water-based adhesive compositions are improved by the incorporation of hollow polymeric microspheres having outer surfaces coated with one or more barrier materials such as calcium carbonate particles. The adhesive compositions exhibit enhanced rheology, sprayability, drying time, tack and storage stability as compared to analogous adhesives that are not modified with coated hollow polymeric microspheres. Such compositions are useful as both contact adhesives as well as wet bonding one-way adhesives.
Claims20
A process for bonding a first substrate to a second substrate comprising:
- a) applying a water-based adhesive composition on a surface of the first substrate, wherein the water-based adhesive composition comprises a) at least about 30 weight percent of water;
- b) an adhesive polymer which is a homopolymer or copolymer of chloroprene having a glass transition temperature that is less than about 0° C.;
- and c) about 1 weight percent to about 3 weight percent of hollow, polymeric microspheres, based on the weight of the water-based adhesive composition, wherein the microspheres are coated with at least one barrier material which provides an outer coating;
- b) drying, at least partially, the water-based adhesive composition to form an adhesive film layer on the surface of the first substrate;
- and
- c) bonding the first substrate to the second substrate.
Dependencies are inferred from the claim text.