Tin-acrylate-containing polymers as algicidal agents in building materials
AssigneeMinnesota Mining and Manufacturing Company
InventorsW. Stuart Bigham, Christine A. Sobon, Billy L. George
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Abstract
Granular materials having a tin-acrylate polymer coating are described which are algae-resistant. A method of inhibiting the growth of algae on roofing granules and other particulate materials attached to substrates by the use of tin-acrylate-containing polymers either as a topical treatment or as a polymeric binder is also presented. The methods presented are an advancement in the art in that in addition to algae-resistance, the polymers also confer other desirable properties to the granules onto which they are coated, such as increased adhesion to asphalt shingles.
Claims13
An algicidal granular material having an algicidal coating on base granules, the coating comprising an organic oil and a tin-acrylate polymer dispersed therein, the tin-acrylate polymer being derived from a monomer composition comprising free-radical polymerizable units independently selected from the group consisting of:
- ##STR5## wherein:
- X is selected from the group consisting of SnR.sup.4 R.sup.5 R.sup.6 and hydrogen;
- R.sup.1 -R.sup.3 inclusive are the same or different and independently selected from the group consisting of hydrogen and organic radicals having from 1 to about 20 carbon atoms;
- and
- R.sup.4 -R.sup.6 inclusive are the same or different and independently selected from the group consisting of hydrogen and alkyl groups having from 1 to about 7 carbon atoms;
- with the provisos that R.sup.1 -R.sup.6 inclusive are selected so that the polymer has a weight average molecular weight ranging from about 5,000 to about 50,000, and said polymer has an effective amount of said SnR.sup.4 R.sup.5 R.sup.6 groups to render said granular material algicidal.
Dependencies are inferred from the claim text.