1. A method comprising providing a substrate having a plurality of molecular chains attached thereto, each chain comprising a hydrophilic group, a hydrophobic segment, and a reversible linker; causing the reversible linker to reversibly crosslink adjacent molecular chains to change a surface of the substrate from hydrophilic to hydrophobic or from hydrophobic to hydrophilic; causing at least some of the molecular chains to straighten and so that the hydrophilic group is furthest from the substrate; and causing at least some of the molecular chains to bend over so that the hydrophilic group is attached to the substrate.
2. A method comprising providing a substrate having a plurality of molecular chains attached thereto, each chain comprising an ionic hydrophilic group, a hydrophobic segment, and a photo-reversible crosslinker; exposing the substrate to a charge opposite to the charge on the ionic hydrophilic group, causing at least some of the molecular chains to straighten and so that the hydrophilic group is furthest from the substrate; exposing the substrate to a charge the same as the charge on the ionic hydrophilic group, causing at least some of the molecular chains to bend over so that the hydrophilic group is attached to the substrate; and thereafter exposing the molecular chains to ultraviolet light to crosslink adjacent molecular chains.
3. A method as set forth in claim 2, wherein the crosslinked chains are exposed to ultraviolet light of a wavelength less than 260 nm to uncrosslink the same.
4. A method comprising providing a substrate with hydroxyl groups attached thereto, reacting the hydroxyl groups with perfluoro dicarbonyl chloride to provide a chlorinated segment attached to the substrate, reacting the chlorinated segment with an excessive amount of dry hydroquoine to produce attached phenol groups, reacting the phenol groups with cinnamic acid to provide molecular chains attached to the substrate, the molecular chains comprising a fluorocarbon segment, crosslinkable double bonds, and hydrophilic carboxylic acid or salt end groups.
5. A method as set forth in claim 4, further comprising imposing positive charges on the substrate through a direct current electric field or exposing the molecular chains to a hydrophilic solvent so that the chains on the surface are stretched with the ionic groups pointed away from the surface.
6. A method as set forth in claim 5, further comprising exposing the molecular chains to ultraviolet light of wavelength greater than 260 nm to promote UV curing through the photo-dimerizationf cinnamic acid linkages to provide crosslinked adjacent molecular chains.
7. A method as set forth in claim 6, further comprising exposing the crosslinked molecular chains to UV light of wavelength less than 260 nm to uncrosslink adjacent molecular chains.
8. A method as set forth in claim 4, further comprising imposing a negative charge on the substrate or exposing the molecular chains to a hydrophobic solvent so that the chains bend over and so that the ionic group attaches to the substrate.
9. A method comprising providing a substrate having a plurality of molecular chains attached thereto, each chain comprising a hydrophilic group, a hydrophobic segment, and a reversible linker, and causing the reversible linker to crosslink adjacent molecular chains, further comprising causing at least some of the molecular chains to bend over so that the hydrophilic group is attached to the substrate.
10. A method comprising providing a substrate having a plurality of molecular chains attached thereto, each chain comprising a hydrophilic group, a hydrophobic segment, and a reversible linker, and causing the reversible linker to crosslink adjacent molecular chains wherein the hydrophilic group is ionic, the exposing the substrate to a charge comprises exposing the substrate to a charge the same as the charge on the ionic hydrophilic group, causing at least some of the molecular chains to bend over so that the hydrophilic group is attached to the substrate.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A coating composition, comprising:
(a) resin system, wherein said resin system includes at least one hydroxy functional unsaturated polyester and at least one hydroxy functional acrylic polymer;
(b) a crosslinker selected from the group consisting of amino resins and isocyanates; and
(c) a conductive pigment;
wherein said unsaturated polyester is unsaturated in the backbone of the polyester and does not undergo further crosslinking in the coating composition through its unsaturation.
2. The composition of claim 1, wherein said polyester contains secondary hydroxyl functionality.
3. The composition of claim 1, wherein said polyester is the esterification reaction product of trimethylolpropane, propylene glycol, maleic anhydride, adipic acid, and phthalic anhydride.
4. The composition of claim 1, wherein said polyester has a weight average molecular weight from about 700 to about 1300.
5. The composition of claim 1, wherein said polyester has an OH value from about 50 to about 400 mg KOHg.
6. The composition of claim 1, wherein said polyester has an OH value from about 100 to about 300 mg KOHg.
7. The composition of claim 1, wherein said acrylic has an OH value from about 20 to about 200 mg KOHg.
8. The composition of claim 1, wherein said acrylic has an OH value from about 50 to about 100 mg KOHg.
9. The composition of claim 1, wherein said acrylic has a weight average molecular weight from about 1600 to about 7000.
10. The composition of claim 1, wherein the unsaturated polyester comprises from about 10% to about 90% by weight of the resin system.
11. The composition of claim 1, wherein said crosslinker is an isocyanate.
12. The composition of claim 11, wherein said isocyanate is an aliphatic isocyanate.
13. The composition of claim 11, wherein the crosslinker is present in a ratio of about 0.8 to about 1.2 based on the NCO:OH ratio.
14. The composition of claim 1, wherein the conductive pigment is carbon black.
15. The composition of claim 1, wherein said crosslinker is an amino resin.
16. The composition of claim 1, wherein the unsaturated polyester is prepared by the esterification of at least on ethylenically unsaturated di- or higher polycarboxylic acid or anhydride with saturated or unsaturated di- or higher polyols.
17. The composition of claim 16, wherein said polyester is the esterification reaction product obtained by reacting about 5% to about 60% by weight, based upon the total weight of acids, anhydrides and polyols, of unsaturated dibasic acids or anhydrides with a polyol.
18. The composition of claim 16, wherein said polyester is the esterification reaction product obtained by reacting about 10% to about 40% by weight, based upon the total weight of acids, anhydrides and polyols, of unsaturated dibasic acids or anhydrides with a polyol.
19. The composition of claim 18, wherein the unsaturated acid or anhydride comprises maleic anhydride.