Uv-curable floor sealants

Abstract

Described is a UV-curable sealant composition, which is preferably a one part sealant. The one part sealant is made from urethane acrylate, acrylate ester, precipitated silica, and photoinitiator. More specifically, the one part sealant is made from about 15-35 weight percent aliphatic and/or alicyclic urethane acrylates, about 40-70 weight percent of acrylate esters, about 0-10 weight percent of precipitated silica, and about 3-8 weight percent of photoinitiator. Also described are methods of applying UV-curable sealant composition to a surface such as a floor and UV curing the UV-curable sealant composition, thereby extending the life of the surface.

What is claimed is: 
     
         1 . A sealant composition comprising an admixture of about 15-35 weight percent of aliphatic and/or alicyclic urethane acrylates, about 40-70 weight percent of acrylate esters, about 0.5-10 weight percent precipitated silica, and about 3-8 weight percent photoinitiator. 
     
     
         2 . The sealant composition of  claim 1 , wherein the sealant composition comprises one part sealant. 
     
     
         3 . The sealant composition of  claim 1 , wherein the sealant composition forms a tough and elastic film on a vinyl composite tile (VCT) surface upon its application to a VCT surface and after UV curing at a wavelength reactive with the photoinitiator so as to initiate curing of the UV-curable sealant composition. 
     
     
         4 . The sealant composition of  claim 1 , wherein the sealant composition remains liquid in the absence of UV-curing. 
     
     
         5 . The sealant composition of  claim 1 , wherein the sealant composition is free of volatile organic compounds. 
     
     
         6 . The sealant composition of  claim 1 , wherein the sealant composition is free of water. 
     
     
         7 . A one part UV-cured sealant composition comprising about 15-35 weight percent of urethane acrylate, about 40-70 weight percent of acrylate ester, about 0.5-10 weight percent precipitated silica, and about 3-8 weight percent photoinitiator, wherein the one part UV-cured sealant composition has been applied to a surface and cured by UV-radiation at a wavelength that initiates said photoinitiator to cure the UV-cured sealant composition. 
     
     
         8 . The one part UV-cured sealant composition of  claim 7 , wherein the UV radiation has a wavelength from about 240 nm to about 400 nm. 
     
     
         9 . The UV-cured sealant composition of  claim 7 , wherein the UV-cured sealant composition forms a slip resistant coating when applied on a vinyl composite tile surface. 
     
     
         10 . The UV-cured sealant composition of  claim 7 , wherein the one part cured sealant is stain resistant, solvent resistant, and abrasion resistant. 
     
     
         11 . The UV-cured sealant composition of  claim 7 , wherein the one part cured sealant allows for removal of stains without loss of gloss. 
     
     
         12 . A method of applying a one part sealant composition to a vinyl composite tile (VCT) floor, the method comprising:
 depositing the one part sealant composition of  claim 2  onto a surface, wherein the one part sealant composition comprises about 15-35 weight percent of urethane acrylate, about 40-70 weight percent of acrylate ester, about 0.5-10 weight percent precipitated silica, and about 3-8 weight percent photoinitiator; and   substantially curing the one part sealant composition upon the VCT floor utilizing UV radiation.   
     
     
         13 . A method of increasing the life of vinyl composite tile (VCT) flooring, the method comprising:
 preparing a VCT floor for application of a one part sealant composition;   substantially eliminating sunlight or other intense light sources from the room;   depositing the one part sealant composition of  claim 2  onto a VCT floor, wherein the one part sealant composition comprises 15-35 weight percent of urethane acrylate, 40-70 weight percent of acrylate ester, 0.5-10 weight percent of precipitated silica, and 3-8 weight percent of photoinitiator; and   curing the one part sealant composition upon the VCT flooring utilizing UV radiation, thus sealing the VCT flooring and extending the VCT flooring's life.   
     
     
         14 . A method of making the one part sealant composition of  claim 2 , the method comprising:
 admixing a one part sealant composition, wherein the one part sealant comprises 15-35 weight percent of urethane acrylate, 40-70 weight percent of acrylate ester, 0.5-10 weight percent of precipitated silica and/or inorganic nanoparticles, and 3-8 weight percent of photoinitiator.   
     
     
         15 . The sealant composition of  claim 1 , wherein the sealant composition when cured forms a tough, abrasion-resistant film that bonds tightly to vinyl composition tile or other resilient flooring products. 
     
     
         16 . The sealant composition of  claim 1 , wherein the sealant composition bonds tightly to vinyl composition tile or other resilient flooring products.