Primer composition for coating
View Patent ↗Disclosed is a primer composition for coating having excellent adhesion properties to a substrate and comprising a polyolefin resin or acrylic resin, without the use of a chlorine-containing compound, which primer composition essentially comprises a polymer (A) having at least a unit of a (meth)acrylic ester monomer (a) in which acryloyloxy group or methacryloyloxy group is bonded to secondary carbon atom or tertiary carbon atom.
1. A method of coating a substrate, comprising:
applying a primer composition to a polyolefin resin substrate;
wherein the primer composition comprises a polymer (A) having a unit of a (meth)acrylic ester monomer (a) in which acryloyloxy group or methacryloyloxy group is bonded to secondary carbon atom or tertiary carbon atom and a unit of monomer (b),
wherein the (meth)acrylic ester monomer (a) is at least one selected from the group consisting of 4-t-butylcyclohexyl acrylate, tricyclodecanyl acrylate, 3,3,5-trimethylcyclohexyl acrylate, and t-butylmethacrylate; and the monomer (b) is at least one selected from the group consisting of (meth)acrylic esters, monomers having hydroxyl group in a molecule, methacrylic acid and styrene, and the content of the unit of monomer (a) in the polymer (A) is no less than 80% by mass and the content of the unit of the monomer (b) in the polymer (A) is no more than 20% by mass.
2. The method of claim 1 , wherein the primer composition further comprises a polymer (B) that is different from the polymer (A).
3. The method of claim 2 , wherein the polymer (B) is a polyolefin resin.
4. The method of claim 1 , wherein the primer composition is applied to a substrate that consists of a polyolefin resin.
5. The method of claim 1 , wherein the primer composition is applied to a polyolefin resin molded product.
6. The method of claim 1 , wherein the primer composition does not contain any compound having a chlorine atom.
7. The method of claim 5 , further comprising:
after the applying, drying the primer composition applied to the polyolefin molded product.
8. The method of claim 1 , wherein the primer composition is applied to the polyolefin resin substrate without surface treating before the applying.
9. The method of claim 1 , wherein the monomer (a) is 4-t-butylcyclohexyl acrylate and the monomer (b) is at least one selected from the group consisting of methacrylate, styrene, dodecyl methacrylate, and butylacrylate.
10. The method of claim 9 , wherein the primer composition applied to the polyolefin resin substrate has an adhesive strength of 392 kPa or greater.
11. The method of claim 9 , wherein the primer composition applied to polyolefin resin substrate has an adhesive strength of 686 kPa or greater.
12. The method of claim 9 , wherein the primer composition applied to the polyolefin resin substrate has an adhesive strength of 490 kPa or greater.
13. The method of claim 9 , wherein the primer composition applied to the polyolefin resin substrate has an adhesive strength of 882 kPa or greater.
14. The method of claim 1 , wherein the primer composition applied to the polyolefin resin substrate has an adhesive strength of from 392 to 882 kPa.
15. The method of claim 1 , wherein the monomer (b) is at least one selected from the group consisting of a (meth)acrylic ester, a (meth)acrylic ester having a hydroxyl group, methacrylic acid and styrene.
16. The method of claim 1 , wherein the monomer (b) is at least one (meth)acrylic ester having a hydroxyl group selected from the group consisting of 2-hydroxyethyl(meth)acrylate, 2-hydroxypropyl(meth)acrylate, 3-hydroxypropyl(meth)acrylate, 2-hydroxybutyl(meth)acrylate, 3-hydroxybutyl(meth)acrylate, 4-hydroxybutyl(meth)acrylate, 3-chloro-2-hydroxypropyl(meth)acrylate, polyethylene glycol(meth)acrylate, polypropylene glycol(meth)acrylate and caprolactone adducts thereof.
17. The method of claim 1 , wherein the monomer (b) is at least one selected from the group consisting of a (meth)acrylic ester, a (meth)acrylic acid and a styrene.