Polymeric coating formulation with hydrophobic side chains
A coating formulation including a polymer produced by radical polymerization, wherein said polymer comprises a backbone with one or more monomers, wherein one or more of said monomers comprises one or more hydrophobic side chains, wherein the hydrophobic side chains are alkyl chains with 8 or more carbon atoms, wherein the overall weight of the hydrophobic side chains is at least 20% (w/w %) of the total weight of the polymer; and one or more anti-blocking agents selected from inorganic pigments, polymers with a Tg or Tm of at more than 40° C., or a combination thereof; wherein said coating formulation comprises at least 30% (w/w %) of said polymer, wherein in weight percent of the coating formulation, the amount of the inorganic pigment is from about 10% to 30% and the amount of polymer with a Tg or Tm of more than 40° C. is from about 10% to about 40%.
1. A coating formulation comprising: a polymer produced by radical polymerization, wherein said polymer comprises a structural unit derived from one or more monomers, wherein one or more of said monomers comprises one or more hydrophobic side chains, wherein the hydrophobic side chains are at least one of linear or branched alkyl chains with 8 or more carbon atoms, wherein the overall weight of the hydrophobic side chains is at least 40% (w/w %) of the total weight of the polymer; and wherein said coating formulation comprises at least 30% (w/w %) of said polymer, and said coating formulation further comprises anti-blocking agents, wherein the anti-blocking agents are a combination of inorganic pigments with polymers with a Tg or Tm of more than 35° C., wherein the ratio of inorganic pigment to polymers with a Tg or Tm of more than 35° C. is equal to or smaller than 1, and wherein the coating formulation provides a heat sealability performance within 1.5 seconds at 150° C. and is repulpable when applied to a paper or Cardboard, and wherein coating formulation does not comprise cellulose.
2. The coating formulation of claim 1 , wherein at least 30% (w/w %) of the structure unit derived from the one or more monomers comprise hydrophobic side chains, and the hydrophobic side chains are alky chains with 8 to 11 carbon atoms.
3. The coating formulation according to claim 1 , wherein the coating formulation comprises between 30% (w/w %) and 80% (w/w %) of polymers produced by radical polymerization, and wherein the water is present in 45 weight percent.
4. The coating formulation according to claim 1 , wherein the polymer comprises a copolymer comprising hydrophobic and non-hydrophobic monomers, the non-hydrophobic monomers comprising alkyl side chains with less than 8 carbon atoms.
5. The coating formulation according to claim 1 , wherein hydrophobic monomers constitute at least 40% (w/w %) and up to 70% (w/w %) of the total monomer weight used in the polymer.
6. The coating formulation according to claim 1 , wherein the one or more monomers are selected from acrylates, methacrylates, olefins, vinyl ethers, vinyl esters, styrenes, maleates, fumarates, itaconates, or derivatives thereof.
7. The coating formulation according to claim 1 , wherein the polymer anti-blocking agents are selected from poly(meth)acrylates, polyvinyl acetates, polyethylene vinylacetates, polyesters, or polymers containing monomers based on (meth)acrylates, styrenes, vinylesters, vinylethers, maleates, fumarates, itaconates, maleimides and maleamides.
8. The coating formulation according to claim 1 , wherein the polymer anti-blocking agents are selected from polyethylene, polypropylene, ethylene-propylene co-polymers, polyethylene vinylacetate, polyethylene vinylchloride, polyethylene acrylates, and polyesters.
9. A heat sealable, water repellent and oil repellent substrate comprising a substrate coated with a coating formulation according to claim 1 .
10. A process for making a heat sealable, water repellent and oil repellent substrate wherein a coating formulation according to claim 1 is applied on a substrate.
11. The coating formulation of claim 1 , wherein from about 40% (w/w %) to about 70% (w/w %) of the structure unit derived from the one or more monomers comprises one or more hydrophobic side chains.
12. The coating formulation according to claim 1 , wherein the one or more monomers comprising one or more hydrophobic side chains are acrylates selected from nonylmethacrylate, decylmethacrylate, laurylmethacrylate, palmitylmethacrylate, stearylmethacrylate, isobornylmethacrylate, or derivatives thereof.
13. The heat sealable, water repellent and oil repellent substrate according to claim 9 , wherein the substrate is selected from paper, plastic or card board.
14. The heat sealable, water repellent and oil repellent substrate according to claim 9 , wherein the substrate is selected from paper or cardboard.
15. The process according to claim 10 , wherein the coating formulation is applied on a substrate selected from paper, plastic or cardboard, wood, thermoplastic or thermoset materials, glass, textile, leather and metals.
16. The coating formulation according to claim 1 , wherein the one or more monomers comprising one or more hydrophobic side chains are acrylates comprising at least one of methylacrylates, or ethyl acrylates.
17. The coating formulation according to claim 1 , wherein the ratio of inorganic pigment to polymers with a Tg of at least 35° C., or a Tm of at least 35° C. is from about 0.3 to about 0.8.
18. The coating formulation according to claim 1 , wherein the coating formulation is free of wax.