Controlled release microbiocide for porous surfaces
AssigneeISP Investments Inc.
InventorWilliam B. Woods
Life of this patent
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Abstract
Algal defacement of coated and non-coated porous masonry and wood construction materials is prevented by pre-treatment of the construction material with an aqueous composition of a copolymer that releases 2-propenal (acrolein) over time.
Claims17
A method of providing a time-released algaecide to a porous surface of a masonry construction material selected from the group consisting of stone, concrete and brick, the method comprising:
- a. contacting the porous surface of said masonry construction material with an aqueous biocidal composition of 2-propenal copolymer, said copolymer having a concentration of at least 0.5%, by weight;
- b. maintaining said porous surface in contact with said algaecidal composition for a period of time sufficient to saturate a portion of the construction material with algaecidal composition, to a depth of about 1 to 5 cm, and
- c. allowing the surface of the construction material to dry, whereby the growth of algae on said masonry construction is inhibited.
A porous masonry construction material selected from stone, concrete or brick that is resistant to surface defacement by algal growth containing an aqueous, algicidal composition of 2-propenal copolymer having a concentration of at least 0.5%, by weight, in a portion of the porous material extending from the surface exposed to algal defacement to a depth of about 1 to 5 cm.
Dependencies are inferred from the claim text.