Method of coating coils using a high solids fluorocarbon coating composition

A coating composition comprising:

• a) a continuous phase comprising:
• (i) a polymer comprising one or more (meth)acrylate monomers and one or more aminoalkyl(meth) acrylate monomers described by the structure:
• 7
• where Z is a divalent linking group;
• R2 and R3 are independently selected from H or C1-C6 linear or branched aliphatic;
• and R4 is H or CH3;
• and
• (ii) a solvent;
• and
• b) a dispersed phase comprising solid dispersible particles of a fluorocarbon polymer.

A coating composition comprising:

• (a) a continuous phase comprising:
• (i) 1 percent to 70 percent by weight based on resin solids of a polymer comprising the polymerized composition of:
• (A) 70 to 99.99 percent by weight, based on the weight of the polymer of one or more monomers selected from the group consisting of methyl(meth)acrylate, n-butyl(meth)acrylate, t-butyl(meth)acrylate, and ethyl(meth)acrylate;
• (B) 0.01 to 10 percent by weight, based on the weight of the polymer of one or more aminoalkyl(meth)acrylate monomers described by the structure:
• 9
• where Z is a divalent linking group;
• R2 and R3 are independently selected from H or C1-C6 linear or branched aliphatic;
• and R4 is H or CH3;
• and
• (C) 0 to 20 percent by weight, based on the weight of the polymer of one or more additional monomers having the structure:
• 10
• wherein R7 is H or CH3 and R6 is —CH2—OH or —CH2—O—R10 where R10 is C1-C6 linear or branched aliphatic;
• wherein the sum of the amounts of (a), (b) and (c) is 100 percent and wherein the weight-average molecular weight of the thermoplastic resin is from 7,000 to 20,000, as determined by gel permeation chromatography using polystyrene standards;
• (ii) a solvent selected from the group consisting of aliphatic hydrocarbons, aromatic hydrocarbons, ketones, esters, glycols, ethers, ether-esters, glycol ethers, glycol ether-esters, alcohols, ether-alcohols, phthalate plasticizers and mixtures thereof;
• and
• (b) 30 to 99 percent by weight based on resin solids of a dispersed phase comprising solid dispersible particles, ranging in size from 0.1 to 5.0 microns, of one or more fluorocarbon polymers selected from the group consisting of poly(vinylidene fluoride), poly(vinyl fluoride), poly(chlorotrifluoroethylene), poly(tetrafluoroethylene), and poly(trifluoroethylene).

A method of coil coating to a metal substrate using a coil coating apparatus comprising:

• A) applying a coating composition such that the wet film thickness is 1 to 10 mils, wherein the coating composition comprises:
• (i) a continuous phase comprising:
• (a) 1 to 70 percent by weight based on total resin solids of a polymer comprising one or more (meth)acrylate monomers and one or more aminoalkyl(meth) acrylate monomers described by the structure:
• 11
• where Z is a divalent linking group;
• R2 and R3 are independently selected from H or C1-C6 linear or branched aliphatic;
• and R4 is H or CH3;
• and
• (b) 25-50 percent by weight of a solvent based on the total weight of the coating composition;
• (ii) 30 to 99 percent by weight based on total resin solids of a dispersed phase comprising solid dispersible particles of a fluorocarbon polymer;
• wherein the total resin solids are 50-75 percent by weight based on the total weight of the coating composition;
• and
• B) curing at a temperature of 200° C. to 300° C. for 10 to 50 seconds to form a cured dry film with a film thickness of 0.5 to 6 mils.

A method of spray coating a substrate using a spray coating apparatus comprising:

• A) applying a coating composition such that the wet film thickness is 1 to 4 mils, wherein the coating composition comprises:
• (i) a continuous phase comprising:
• (a)) 1 to 70 percent by weight based on total resin solids of a polymer comprising one or more (meth)acrylate monomers and one or more aminoalkyl(meth) acrylate monomers described by the structure:
• 13
• where Z is a divalent linking group;
• R2 and R3 are independently selected from H or C1-C6 linear or branched aliphatic;
• and R4 is H or CH3;
• and
• (b) 25-50 percent by weight of a solvent based on the total weight of the coating composition;
• and
• (ii) 30 to 99 percent by weight based on total resin solids of a dispersed phase comprising solid dispersible particles of a fluorocarbon polymer;
• wherein the total resin solids are 50-75 percent by weight based on the total weight of the coating composition;
• and
• B) curing at a temperature of 200° C. to 300° C. for 5 to 20 minutes to form a cured dry film with a film thickness of 0.3 to 2 mils.

A method of extrusion coating a substrate using an extrusion coating apparatus comprising:

• A) applying a coating composition such that the wet film thickness is 1 to 6 mils, wherein the coating composition comprises:
• (i) a continuous phase comprising:
• (a) 1 to 70 percent by weight based on total resin solids of a polymer comprising one or more (meth)acrylate monomers and one or more aminoalkyl(meth) acrylate monomers described by the structure:
• 15
• where Z is a divalent linking group;
• R2 and R3 are independently selected from H or C1-C6 linear or branched aliphatic;
• and R4 is H or CH3;
• and
• (b) 25-50 percent by weight of a solvent based on the total weight of the coating composition;
• and
• (ii) 30 to 99 percent by weight based on total resin solids of a dispersed phase comprising solid dispersible particles of a fluorocarbon polymer;
• wherein the total resin solids are 50-75 percent by weight based on the total weight of the coating composition;
• and
• B) curing at a temperature of 200° C. to 500° C. for 10 seconds to 20 minutes to form a cured dry film with a film thickness of 0.3 to 4 mils.