Method of making an easily cleanable polymer laminate
View Patent ↗A method for preparing a substrate having an adherent, durable, flexible, and stain resistant layer. The layer is formed by applying a composition that includes (i) the reaction product of a polyester and a polyoxetane having at least one carboxylic acid end group and at least one pendant —CH 2 —O—(CH 2 ) n —Rf group and (ii) an amino resin curative. The substrate may be printed or embossed or both. The coated substrate has both stain resistant properties and dry erase properties.
1. A method of providing a laminate, the method comprising:
a) applying to a substrate a composition comprising
1) a reactive polyester comprising at least one segment comprising an ether repeat unit that comprises a pendent fluoroalkoxyalkyl group and a reactive hydrogen atom, and
2) an amino resin; and
b) allowing said polyester and said amino resin to react so as to form a crosslinked coating where the reactive hydrogen atom reacts with the amino resin, thereby providing said laminate.
2. The method of claim 1 , where the composition further comprises a solvent and a catalyst.
3. The method of claim 2 , where the solvent is selected from the group consisting of methyl ethyl ketone, water, alcohols, and a combination thereof, and where the catalyst is an acidic catalyst.
4. The method of claim 3 , where the catalyst is selected from the group consisting of boric acid, phosphoric acid, acid sulfates, hydrochlorides, phthalic anhydride or acid, oxalic acid, ammonium salts of oxalic acid, sodium ethyl sulfates, barium ethyl sulfates, aliphatic sulfonic acids, aromatic sulfonic acids, p-toluene sulfonic acid, methane sulfonic acid, and mixtures thereof.
5. The method of claim 2 , wherein the amino resin is selected from the group consisting of alkylated benzoguanamine-formaldehyde resin, alkylated urea-formaldehyde resin, alkylated melamine-formaldehyde resin, and mixtures thereof.
6. The method of claim 5 , where the amino resin is alkylated by reaction with an alcohol selected from the group consisting of n-butanol, n-propanol, isopropanol, ethanol, and methanol.
7. The method of claim 5 , where the amino resin is a melamine-formaldehyde resin.
8. The method of claim 2 , where the pendent fluoroalkoxyalkyl group is defined by the formula —CH 2 —O—(CH2) n —Rf, where n is an integer from 1 to 3 and Rf is, independently for each monomer unit, a linear or branched alkyl group including 1 to 20 carbon atoms, wherein at least 25% of the hydrogen atoms of said Rf group are replaced by fluorine.
9. The method of claim 8 , where at least 95% of said hydrogen atoms of said Rf group are replaced by fluorine.
10. The method of claim 8 , where said pendent fluoroalkoxyalkyl group derives from an oxetane monomer having the formula
where n is an integer from 1 to 3 and Rf is a linear or branched alkyl group including 1 to 20 carbon atoms, wherein at least 20% of the hydrogen atoms of said Rf group are replaced by fluorine and, where R is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
11. The method of claim 2 , where said reactive polyester is the reaction product of a hydroxyl terminated polymer that comprises said ether repeat unit and a polyester.
12. The method of claim 2 , wherein the weight ratio of said reactive polyester to said amino resin is about 10:90 to 90:10.
13. The method of claim 2 , wherein the weight ratio of said reactive polyester to said amino resin is about 20:80 to 80:20.
14. The method of claim 1 , where said substrate is selected from the group consisting of cellulosic products, fibers, polyolefins, polyesters, polycarbonates, polystyrene, polymethacrylates, polyvinyl chloride, metals and ceramics.
15. The method of claim 1 , where the reactive polyester includes a carboxylic acid or hydroxyl group.
16. A method of providing a laminate, the method comprising:
a) applying to a substrate a composition comprising
1) a polyester alkyd resin comprising at least one segment comprising an ether repeat unit that comprises a pendent fluoroalkoxyalkyl group, and
2) an amino resin selected from the group consisting of alkylated benzoguanamine-formaldehyde resin, and alkylated urea-formaldehyde resin, alkylated melamine-formaldehyde resin, and mixtures thereof; and
b) allowing said polyester and said amino resin to react so as to form a crosslinked coating, thereby providing said laminate.
17. The method of claim 16 , where the composition further comprises a solvent and a catalyst.
18. The method of claim 17 , where the solvent is selected from the group consisting of methyl ethyl ketone, water, alcohols, or a combination thereof, and where the catalyst is an acidic catalyst.
19. The method of claim 17 , where the pendent fluoroalkoxyalkyl group is defined by the formula —CH2—O—(CH2) n —Rf, where n is an integer from 1 to 3 and Rf is, independently for each monomer unit, a linear or branched alkyl group including 1 to 20 carbon atoms, wherein at least 25% of the hydrogen atoms of said Rf group are replaced by fluorine.
20. The method of claim 19 , where at least 95% of said hydrogen atoms of said Rf group are replaced by fluorine.
21. The method of claim 16 , where the polyester alkyd resin includes an active hydrogen atom.
22. The method of claim 21 , where the active hydrogen atom is associated with a carboxyl or hydroxyl end group.
23. The method of claim 16 , where the substrate includes decorating or printing.
24. The method of claim 16 , where the amino resin is a melamine-formaldehyde resin.