Anti-smudge and anti-graffiti compositions
Polyurethane-based and epoxy-based coating compositions are described that provide coatings and adhesives that are clear, amphiphobic and durable. Both water and hexadecane readily slide off these surfaces without leaving a residue. Coatings with thicknesses ranging from about 10 nm to about 10 μm exhibited excellent transmittance properties. Such films exhibited durability against abrasion, ink-resistance, anti-graffiti, anti-fingerprint, and strong adhesion to glass surfaces. The coatings are applicable to electronic devices, fabrics, glass, etc. to prepare optically clear, stain-resistant, and smudge-resistant surfaces.
1. A polyurethane-based coating composition prepared by combining:
a graft copolymer that is a polyol that comprises a polysiloxane, PFPE, PEO, PIB, or PB moiety;
di-, tri-, or poly-isocyanate; and, optionally
a polyol that does not comprise a polysiloxane, PFPE, PEO, PIB, nor PB moiety;
wherein the coating composition comprises about 0.1 wt % to about 40 wt % siloxane, fluorine, PEO, PIB, or PB.
2. The polyurethane-based coating composition of claim 1 , wherein the polyol that comprises a polysiloxane, PFPE, PEO, PIB, or PB moiety is polyol-g-polysiloxane.
3. The polyurethane-based coating composition of claim 1 , wherein the graft copolymer that comprises a polysiloxane, PFPE, PEO, PIB, or PB moiety is P(S-alt-MA)-g-polysiloxane.
4. A polyurethane-based coating composition prepared by combining:
a graft copolymer comprising at least one functional moiety and at least one polysiloxane moiety;
isocyanate (bi-, tri- or multi-); and
polyol, polyamine, or a combination of polyol and polyamine;
wherein a coating resulting from application of the coating composition is anti-smudge.
5. The polyurethane-based coating composition of claim 4 , wherein the coating is clear.
6. The polyurethane-based coating composition of claim 4 , wherein the graft copolymer and the isocyanate are allowed to react and then the polyol, polyamine, or combination of polyol and polyamine is added.
7. The polyurethane-based coating composition of claim 1 , wherein the graft copolymer that is a polyol comprises CH 2 ═CH—CO 2 -polysiloxane, CH 2 ═CH—CO 2 -PDMS, CH 2 ═C(CH 3 )—CO 2 -polysiloxane or CH 2 ═C(CH 3 )—CO 2 -PDMS monomers.
8. The polyurethane-based coating composition of claim 1 , wherein the coating is clear.
9. The polyurethane-based coating composition of claim 2 , wherein the coating is clear.
10. The polyurethane-based coating composition of claim 3 , wherein the coating is clear.
11. The polyurethane-based coating composition of claim 1 , wherein the coating is anti-smudge.
12. The polyurethane-based coating composition of claim 2 , wherein the coating is anti-smudge.
13. The polyurethane-based coating composition of claim 3 , wherein the coating is anti-smudge.
14. The polyurethane-based coating composition of claim 8 , wherein the coating is anti-smudge.
15. The polyurethane-based coating composition of claim 9 , wherein the coating is anti-smudge.
16. The polyurethane-based coating composition of claim 10 , wherein the coating is anti-smudge.