Conformable coating composition comprising fluorinated copolymer
Conformable coating composition are described comprising a (meth)acrylate copolymer comprising interpolymerized monomer units of fluorinated monomer and a volatile solvent having a solubility parameter from 4.9-12.5 (cal/cm 3 ) 1/2 . In some embodiments, the fluorinated monomer has a Tg <30° C. In some embodiments, the dried coating exhibits no blocking and no greater than 75% failure at an elongation of 100%. Also described is a conformable film comprising a dried coating composition of the coating compositions described herein, articles comprising a layer of the conformable film on a substrate, and a copolymer comprising interpolymerized units of fluorinated monomer(s), silane monomer(s); and one or more monomers having a Tg ≥50° C.
1. A conformable coating composition comprising:
a (meth)acrylate copolymer comprising interpolymerized monomer units of 2,2,2-trifluoroethyl acrylate in an amount ranging from 10-40 wt-% based on the weight of the (meth)acrylate copolymer; and
a volatile solvent having a solubility parameter from 4.9-12.5 (cal/cm 3 ) 1/2 , wherein the volatile solvent is selected from the group consisting of volatile linear and cyclic siloxanes, volatile polydimethylsiloxanes, isooctane, octane, and combinations thereof, and
wherein the conformable coating composition is free of polymerizable cyanoacrylate monomer.
2. The conformable coating composition of claim 1 , the (meth)acrylate copolymer further comprising interpolymerized monomer units of a high Tg monomer in an amount ranging from 15 to 40 wt-% based on the weight of the (meth)acrylate copolymer, wherein the high Tg monomer has a Tg ≥50° C.
3. The conformable coating composition of claim 2 , the high Tg monomer comprising an acid-functional group.
4. The conformable coating composition of claim 1 , the (meth)acrylate copolymer further comprising interpolymerized monomer units of a silane monomer, wherein the silane monomer has a Tg <10° C.
5. The conformable coating composition of claim 4 , the interpolymerized monomer units of the silane monomer being present in an amount ranging from 15 to 60 wt-% based on the weight of the (meth)acrylate copolymer.
6. The conformable coating composition of claim 4 , wherein the silane monomer is represented by the formula:
A-R 8 —[Si—(R 9 ) 3 ] q ,
wherein:
A is an ethylenically unsaturated polymerizable group selected from vinyl, allyl, vinyloxy, allyloxy, and (meth)acryloyl;
R 8 is a covalent bond or a divalent (hetero)hydrocarbyl group;
each R 9 is independently selected from a monovalent alkyl, aryl, alkoxy, and trialkylsilyloxy group; and
q is at least one.
7. The conformable coating composition of claim 1 , wherein the composition comprises at least 40 wt. % of the volatile solvent.
8. A conformable film comprising the coating composition of claim 1 .
9. A multilayer article comprising:
the conformable film of claim 8 ; and
a substrate,
wherein the conformable film forms a layer on the substrate.