Solvent-based fluoropolymer additives and their use in coating compositions

1. A coating composition comprising a fluoropolymer composition and a coating base, wherein the fluoropolymer composition comprises a fluoropolymer dissolved in an organic solvent and further wherein the fluoropolymer comprises repeating units in any sequence of polymer units:

(R f —X—Y—C(O)—CZ—CH 2 ) a —  I:

(R f —X—Y—C(O)—CH—CH 2 ) b —  II:

(R 1 —O—C(O)—C(CH 3 )—CH 2 ) c —  III:

(R 1 —O—C(O)—CH—CH 2 ) d —  IV:

(R 2 —O—C(O)—CH—CH 2 ) e —  V:

(R 2 —O—C(O)—C(CH 3 )—CH 2 ) g —  VI:

(R 3 —Y—C(O)—CT-CH 2 ) h —  VII:

wherein

R f is C 6 F 13 —, and is a straight or branched alkyl, or a combination thereof;

X is an organic divalent linking group having from about 1 to about 20 carbon atoms, optionally containing a triazole, oxygen, nitrogen, or sulfur, or a combination thereof;

Y is O;

Z is a straight or branched alkyl group having from about 1 to about 4 carbon atoms, or halide;

R 1 is a straight or branched alkyl group having from 12 to 22 carbon atoms;

R 2 is an alkyl group having a chain length of from 1 to 6 carbon atoms, which carbon chain may be branched;

T is H, a straight, branched or cyclic alkyl group having from about 1 to about 10 carbon atoms, or halide;

R 3 is H, (CH 2 CH 2 O) i R 4 , or (CH 2 CH(CH 3 )O) i R 4 ;

each R 4 is independently H or CH 2 OH;

i is 1 to about 200; and

j is 0 to about 40;

provided that

1) the repeating unit I, (R f —X—Y—C(O)—CZ—CH 2 ) a —, is present at a minimum of about 25% by weight of the polymer;

2) repeating units I and II ((R f —X—Y—C(O)—CZ—CH 2 ) a and (R f —X—Y—C(O)—CH—CH 2 ) b ) are present at a minimum combined total of about 30% by weight of the polymer; and

3) the total of all repeating units, I-VII plus any optional monomers equals 100% by weight of the polymer,

wherein the subscripts a, c, and g are each independently from 5 to about 5,000, the subscripts b, e, and d are each independently from 0 to about 2,000, and subscript h is a positive integer up to 2,000;

wherein the organic solvent is methyl isobutyl ketone, butyl acetate, tetrahydrofuran, acetone, isopropanol, ethyl acetate, methylene chloride, chloroform, carbon tetrachloride, cyclohexane, hexane, dioxane, hexafluoroisopropanol, or a mixture of two or more thereof, and

wherein the coating base is selected from the group consisting of an alkyd coating, a Type I urethane coating, and an unsaturated polyester coating.

2. The coating composition according to claim 1 wherein R 1 is stearyl, CH 3 (CH 2 ) 17 and R 2 is 2-ethylhexyl, CH 3 (CH 2 ) 3 CH(C 2 H 5 )CH 2 .

3. The coating composition according to claim 1 wherein the organic solvent is cyclohexane or methyl isobutyl ketone.

4. The composition of claim 1 further comprising an application solvent, which is selected from the group consisting of alcohols and ketones.

5. The coating composition according to claim 1 wherein the coating base is a solvent-based paint and the fluoropolymer composition is added to the paint in an amount of 0.001 weight % to about 1 weight % on a dry weight basis of the fluoropolymer to the weight of the wet paint.

6. The coating composition according to claim 5 wherein the fluoropolymer composition is added to the paint in an amount of 0.01 weight % to about 0.5 weight % on a dry weight basis of the fluoropolymer to the weight of the wet paint.

7. The coating composition according to claim 5 wherein the fluoropolymer composition is added to the paint in an amount of 0.05 weight % to about 0.25 weight % on a dry weight basis of the fluoropolymer to the weight of the wet paint.

8. The coating composition of claim 1 wherein R f is C 6 F 13 —, and is a straight or branched alkyl, or a combination thereof; R 1 is stearyl, CH 3 (CH 2 ) 17 ; R 2 is 2-ethylhexyl, CH 3 (CH 2 ) 3 CH(C 2 H 5 )CH 2 ; and the organic solvent is cyclohexane or methyl isobutyl ketone.

9. A method for treating a substrate with a coating composition comprising contacting the substrate with the coating composition and drying or curing the coating composition on the substrate, wherein the coating composition comprises a fluoropolymer composition and a coating base, wherein the fluoropolymer composition comprises a fluoropolymer dissolved in an organic solvent and further wherein the fluoropolymer comprises repeating units in any sequence of polymer units:

[R f —X—Y—C(O)—CZ—CH 2 ] a —  I:

[R f —X—Y—C(O)—CH—CH 2 ] b —  II:

[R 1 —O—C(O)—C(CH 3 )—CH 2 ] c —  III:

[R 1 —O—C(O)—CH—CH 2 ] d —  IV:

[R 2 —O—C(O)—CH—CH 2 ] e —  V:

[R 2 —O—C(O)—C(CH 3 )—CH 2 ] g —  VI:

[R 3 —Y—C(O)—CT-CH 2 ] h —  VII:

wherein

R f is C 6 F 13 —, and is a straight or branched alkyl, or a combination thereof;

X is an organic divalent linking group having from about 1 to about 20 carbon atoms, optionally containing a triazole, oxygen, nitrogen, or sulfur, or a combination thereof;

Y is O;

Z is a straight or branched alkyl group having from about 1 to about 4 carbon atoms, or halide;

R 1 is a straight or branched alkyl group having from 12 to 22 carbon atoms;

R 2 is an alkyl group having a chain length of from 1 to 6 carbon atoms, which carbon chain may be branched;

T is H, a straight, branched or cyclic alkyl group having from about 1 to about 10 carbon atoms, or halide;

R 3 is H, [CH 2 CH 2 O] i R 4 or [CH 2 CH(CH 3 )O] i R 4 ;

each R 4 is independently H or CH 2 OH;

i is 1 to about 200; and

j is 0 to about 40;

provided that

1) the repeating unit I, [R f —X—Y—C(O)—CZ—CH 2 ] a —, is present at a minimum of about 25% by weight of the polymer;

2) repeating units I and II ([R f —X—Y—C(O)—CZ—CH 2 ] a and [R f —X—Y—C(O)—CH—CH 2 ] b ) are present at a minimum combined total of about 30% by weight of the polymer; and

3) the total of all repeating units, I-VII plus any optional monomers equals 100% by weight of the polymer;

wherein the subscripts a, c, and g are each independently from 5 to about 5,000, the subscripts b, e, and d are each independently from 0 to about 2,000, and subscript h is a positive integer up to 2,000,

wherein the organic solvent is methyl isobutyl ketone, butyl acetate, tetrahydrofuran, acetone, isopropanol, ethyl acetate, methylene chloride, chloroform, carbon tetrachloride, cyclohexane, hexane, dioxane, hexafluoroisopropanol, or a mixture of two or more thereof, and

wherein the coating base is selected from the group consisting of an alkyd coating, a Type I urethane coating, and an unsaturated polyester coating.

10. The method according to claim 9 wherein the contacting step is by brush, spray, roller, doctor blade, wipe, dip, foam, liquid injection, immersion or casting.

11. The method according to claim 9 wherein the drying or curing step is performed by air curing, polymerizing, or energy curing.