Waterborne hydrophobic barrier coatings derived from copolymers of higher vinyl esters
AssigneeAir Products Polymers, L.P.
InventorJohn Richard Boylan
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Abstract
A blend comprising a paraffin wax emulsion and a polymer emulsion, wherein the polymer contains polymerized units of one or more C1-12 ester of acrylic or methacrylic acid and a vinyl ester of a C8-13 neo-acid. When the blend is applied as a coating to a substrate, such as a nonwoven web, a nonwoven absorbent pad, a nonwoven textile, or a textile fabric, and dried, it has a hydrostatic head barrier sufficient to prevent passage of aqueous fluids but allow passage of water vapor through it. A multi-layer material comprising at least one layer of a nonwoven web, an absorbent pad, or a textile, and at least one layer of the above described blend.
Claims8
A blend for use as a barrier coating on a substrate, wherein the barrier coating provides a hydrostatic head barrier sufficient to prevent passage of aqueous fluids but allow passage of water vapor through said barrier coating, said blend comprising a paraffin wax emulsion and a polymer emulsion, said polymer emulsion comprising a polymer containing polymerized units of one or more C1-12 esters of acrylic or methacrylic acid and a vinyl ester of a C8-13 neo-acid obtained from a single or mixture of tri- and tetramers of propylene, the polymer having a Tg of −15 to −70° C.
Dependencies are inferred from the claim text.