Radon barrier film forming compositions
AssigneeEastman Chemical Company
InventorsCephas H. Sloan, Robin L. Minga, T. Hugh Williams
Life of this patent
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Abstract
This invention relates to a method for rendering a surface substantially impervious to alpha particle radiation such as that produced through radon decay. More particularly, the present invention involves applying to said surface an emulsion containing a sulfopolyester and a copolymer of vinyl acetate and dialkyl maleate, and a plasticizer. The sulfopolyester-acrylic copolymer blend produces a stable alpha particle radiation barrier on sand, rocks and soil.
Claims18
A method for rendering a surface substantially impervious to alpha particle radiation comprising applying to said surface a sulfopolyester-acrylic copolymer blend comprising:
- (1) at least one sulfopolyester consisting essentially of repeat units from
- (a) a dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, cyclohexanedicarboxylic acid, cyclohexanediacetic acid, diphenyl-4,4'-dicarboxylic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and combinations thereof;
- (b) a diol;
- and
- (c) a difunctional sulfomonomer containing at least one sulfonate group attached to an aromatic nucleus wherein the functional groups are hydroxy, carboxy or amino, provided the difunctional sulfomonomer is present in an amount from 12 to 25 mole percent based on 100 mole percent dicarboxylic acid and 100 mole percent diol;
- and
- (2) an acrylic copolymer having repeat units from 50 to 90 weight percent vinyl acetate and 10 to 50 weight percent of a dialkyl maleate having the formula ##STR7## which is polymerized in an aqueous dispersion of the sulfopolyester;
- wherein R is independently a monovalent alkyl radical having 1 to 12 carbon atoms;
- and
- (3) 0.5 to 5.0 weight percent of a plasticizer of the formula:
- ##STR8## wherein R.sup.1 is selected from the group consisting of CH.sub.2 CH.sub.2 OH, CH(OH)CH.sub.3, and CH(OH)CH.sub.2 OH;
- R.sup.2 is selected from the group consisting of hydrogen, an alkyl radical having 1 to 6 carbon atoms, an alkoxy radical having 1 to 6 carbon atoms, a cycloalkoxy radical having 3 to 6 carbon atoms and an aryl radical having 6 to 14 carbon atoms;
- and R.sup.3 is selected from the group consisting of hydrogen and ##STR9##
A method for rendering a surface substantially impervious to alpha particle radiation comprising applying to said surface a sulfopolyester-acrylic copolymer blend comprising:
- (1) at least one sulfopolyester consisting essentially of repeat units from
- (a) a dicarboxylic acid selected from the group consisting of terephthalic acid, phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, cyclohexanedicarboxylic acid, cyclohexanediacetic acid, and combinations thereof;
- (b) a diol selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, 1,4-cyclohexanedimethanol, and combinations thereof;
- and
- (c) a difunctional sulfomonomer selected from the group consisting of sulfophthalic acid, sulfoterephthalic acid, sulfoisophthalic acid, 4-sulfonaphthalene-2,7-dicarboxylic acid, and esters thereof, provided the difunctional sulfomonomer is present in an amount from 4 to 25 mole percent based on 100 mole percent dicarboxylic acid and 100 mole percent diol;
- and
- (2) an acrylic copolymer having repeat units from 50 to 90 weight percent vinyl acetate and 10 to 50 weight percent of a dialkyl maleate having the formula ##STR10## which is polymerized in an aqueous dispersion of the sulfopolyester;
- wherein R is a monovalent alkyl radical having 1 to 12 carbon atoms;
- and
- (3) 0.5 to 5.0 weight percent of a plasticizer selected from the group consisting of ethanol, glycerin, propylene glycol, ethylene glycol, glycerol monoacetate, glycerol diacetate and combinations thereof.
Dependencies are inferred from the claim text.