Clear coating composition

Patent metadata

Field	Value
Publication number	US-10040965-B2
Application number	US-201415037959-A
Country	US
Kind code	B2
Filing date	Nov 19, 2014
Priority date	Nov 20, 2013
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Provided are a clear coating composition which is used for top coats, the composition containing a crosslinking agent and a functional group-containing (meth)acrylate polymer formed by polymerization of a monomer component that includes an aromatic ring-containing (meth)acrylate and a functional group-containing monomer. Also provided is a clear coat composition which is used for top coats, the composition containing a crosslinking agent and a functional group-containing (meth)acrylate polymer formed by polymerization of a monomer component that includes a functional group-containing monomer and a fluorine atom-containing monomer. This clear coat composition has low colorability, has a high refractive index without the use of a filler, provides excellent glossy even when a filler is used, and can be applied to a thick film.

First claim

The invention claimed is:

1. A clear coating composition used for a top coat, comprising:
(A) a functional group-containing (meth)acrylate-based polymer made by the polymerization of a monomer component comprising an aromatic ring-containing (meth)acrylate and a functional group-containing monomer represented by the formula (I):

wherein R 1 represents hydrogen atom or methyl group, and R 2 represents hydroxyl group, an alkyl group of 1 to 4 carbon atoms having hydroxyl group, carboxyl group, an alkyl group of 1 to 4 carbon atoms having carboxyl group, epoxy group, an alkyl group of 1 to 4 carbon atoms having epoxy group, a hydroxyalkyloxycarbonyl group having a hydroxyalkyl group of 1 to 4 carbon atoms or a group represented by the formula:

wherein n represents an integer of 3 to 20, and
(B) a crosslinking agent,
wherein said aromatic ring-containing (meth)acrylate is at least one member selected from the group consisting of naphthalene (meth)acrylate, anthranyl (meth)acrylate, phenanthryl (meth)acrylate and naphthalene-containing urethane-modified methacrylate.

2. The clear coating composition according to claim 1 , further comprising a filler having an average particle diameter of 3 to 30 nm in an amount of 1 to 25 parts by mass per 100 parts by mass of the functional group-containing (meth)acrylate-based polymer.

3. A clear coating composition used for a top coat, comprising:
(A) a functional group-containing (meth)acrylate-based polymer made by the polymerization of a monomer component comprising a functional group-containing monomer represented by the formula (I):

wherein R 1 represents hydrogen atom or methyl group, and R 2 represents hydroxyl group, an alkyl group of 1 to 4 carbon atoms having hydroxyl group, carboxyl group, an alkyl group of 1 to 4 carbon atoms having carboxyl group, epoxy group, an alkyl group of 1 to 4 carbon atoms having epoxy group, a hydroxyalkyloxycarbonyl group having a hydroxyalkyl group of 1 to 4 carbon atoms or a group represented by the formula:

wherein n represents an integer of 3 to 20, and a fluorine atom-containing monomer represented by the formula (II):

wherein R 1 is the same as the above, and R 3 represents an alkyl group of 2 carbon atoms having 3 fluorine atoms, and (B) a crosslinking agent,
wherein the content of the functional group-containing monomer in the monomer component is 5 to 40% by mass, and the content of the fluorine atom-containing monomer in the monomer component is 60 to 95% by mass.

4. The clear coating composition according to claim 3 , wherein the content of the functional group-containing monomer in the monomer component is 5 to 30% by mass, and the content of the fluorine atom-containing monomer in the monomer component is 70 to 95% by mass.

5. The clear coating composition according to claim 3 , wherein the content of the functional group-containing monomer in the monomer component is 5 to 20% by mass, and the content of the fluorine atom-containing monomer in the monomer component is 80 to 95% by mass.

Assignees

• Osaka Organic Chemical Ind Ltd
• Honda Motor Co Ltd

Inventors

• Kitanohara Mitsuko
• Matsuoka Kazuyoshi
• Saruwatari Yoshiyuki
• Kojima Keisuke
• Kondo Masuo

Classifications

• C08K3/22

  of metals · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08F220/1804

  C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate · CPC title

• C09D7/40

  Additives · CPC title

• C08G18/6229

  Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols · CPC title