Foam compositions for surface application to fibrous substrates
AssigneeHercules Incorporated
InventorEdward G. McCrossin
Life of this patent
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Abstract
Improved rosin-based foams suitable for surface application to fibrous substrates such as paper and paperboard are described. The foams are obtained by aerating an aqueous solution having a pH of at least 8 and containing 0.1 to 5% of a water-soluble salt of rosin or fortified rosin and 0.02 to 5% of a water-soluble, amine-containing polymer compatible with the salt, the weight ratio of the salt to the polymer being within the range of 1:1 to 25:1.
Claims10
In a composition suitable for surface application to a fibrous substrate, said composition being a foam produced by the aeration of an aqueous solution containing from 0.1 to 5 weight percent of a water-soluble salt of rosin or fortified rosin, the improvement wherein said aqueous solution has a pH of at least 8 and contains 0.02 to 5 weight percent of at least one water-soluble, amine-containing synthetic, addition or condensation type polymeric material compatible with said salt, the weight ratio of said salt to said polymeric material being within the range of 1:1 to 25:1.
In the process for producing a foam by aerating an aqueous solution containing 0.1 to 5 weight percent of a water soluble salt of rosin or fortified rosin, the improvement which comprises incorporating in said aqueous solution prior to aerating from 0.02 to 5 weight percent of at least one water soluble, amine-containing synthetic addition or condensation type polymeric material compatible with said salt, the weight ratio of said salt to said polymeric material being within the range of 1:1 to 25:1 and carrying out the aerating step on the resulting solution at a pH of at least 8.
Dependencies are inferred from the claim text.