Method of retarding fouling of substrate surfaces

Claim 2

A method according to claim 1 where the substituted methyl amine compound is a diamine having amino groups attached to nonbenzenoid carbon atoms.

Claim 3

A method according to claim 1 where the organic acid is mixed with an inert solvent.

Claim 4

A method according to claim 1 where the Substituted methyl amine compound is selected from the group consisting of ethylene diamine, hexamethylene diamine and dimethyl hexamethylene diamine; isophorone diamine, 1,4-cyclohexane bis methylamine, 4, 4''-diamino-dicyclohexyl methane, meta xylene diamine, paraxylene diamine, tetrachloroparaxylene diamine, cyclobutane-1,2 bis methylamine, methane diamine, imino bis propylamine, bis (amino propyl) piperazine, diethylene triamine, triethylene tetramine, and tetraethylene pentamine.

Claim 5

A method according to claim 6 where the solid substrate surface is selected from at least one of the group consisting of polyethylene, polypropylene, silicone rubber, and release agent coated metals, cured millable gum silicone rubber, cured natural rubber, rubberlike polymers, thermoplastic polymeric materials, and thermoset polymeric materials.

Claim 6

A method according to claim 7 where the substrate surface is a silicone rubber, and where the organic acid is concentrated. 4 A method according to claim 1 where the said deposit is formed in the pores of a substrate surface which comprises successively treated the deposit with successively lower organic acids selected from the group consisting of formic acid, acetic acid, propionic acid, and drying the said substrate surface.

Claim 7

A method according to claim 1 where the deposit is formed by contacting the substrate surface in the presence of water and carbon dioxide with a polyurethane reaction mixture, curing the reaction mixture, and removing the resulting cured polyurethane article from the substrate surface, where the polyurethane reaction mixture contains at least one of the substituted methyl amine compounds.

Claim 8

A method according to claim 9 where the deposit is removed from the substrate surface and where the substituted methyl amine compound is selected from at least one of the group consisting of ethylene diamine, hexamethylene diamine and dimethyl hexamethylene diamine; isophorone diamine, 1,4-cyclohexane bis methyl amine, 4,4''-diamino-dicyclohexyl methane, meta xylene diamine, para-xylene diamine, tetrachloroparaxylene diamine, cyclobutane-1,2 bis methylamine, menthane diamine, imino bis propylamine, bis (amino propyl) piperazine, diethylene triamine, triethylene tetramine, and tetraethylene pentamine.

Claim 9

A method according to claim 10 where the solid substrate surface is selected form at least one of the group consisting of polyethylene, polypropylene, silicone rubber, and release agent coated metals, cured millable gum silicone rubbers, cured natural rubber, rubberlike polymers, thermoplastic polymeric materials, and thermoset polymeric materials.

Claim 10

A method according to claim 11 where the substrate surface is a silicone rubber, where the organic acid is concentrated and where the said polyurethane reaction mixture is prepared from (a) at least one reactive hydrogen-containing polymeric material having a molecular weight between about 700 and about 5,000 selected from the group consisting of polyester polyols, polyester amides, polyether polyols, dihydroxyl-terminated polymers of conjugated diene hydrocarbons, and castor oil, (b) at least one organic polyisocyanate, the overall molar ratio of the isocyanate groups of the polyisocyanate to the reactive hydrogens of the hydrogen-containing polymeric material being between about 1.1/1 and about 12/1, and (c) at least one diamine having amino groups attached to nonbenzenoid carbon atoms in a ratio of from about 0.5/1 to about 1.5/1 of amine groups to the isocyanate groups in excess of the reactive hydrogen-containing polymeric material.