Multilayer film and two-liquid curable coating agent

Patent metadata

Field	Value
Publication number	US-2020254743-A1
Application number	US-201816642420-A
Country	US
Kind code	A1
Filing date	Aug 28, 2018
Priority date	Aug 31, 2017
Publication date	Aug 13, 2020
Grant date	—

Abstract

A multilayer film includes a substrate layer; a surface protective layer integrally laminated on a first surface of the substrate layer, the surface protective layer containing a polyurethane which is a reaction product of a polyol (P) having a hydroxyl value of 25 to 380 mgKOH/g and a content of fluorine atoms of 0.01 to 20% by mass and a polyisocyanate (I); and an adhesive layer integrally laminated on a second surface of the substrate layer. Also described is a two-liquid curable coating agent for forming the surface protective layer.

First claim

1 . A multilayer film comprising:
a substrate layer; a surface protective layer integrally laminated on a first surface of the substrate layer, the surface protective layer containing a polyurethane which is a reaction product of a polyol (P) having a hydroxyl value of 25 to 380 mgKOH/g and a content of fluorine atoms of 0.01 to 20% by mass and a polyisocyanate (I); and an adhesive layer integrally laminated on a second surface of the substrate layer.

2 . The multilayer film according to claim 1 , wherein the hydroxyl value of the polyol (P) is 120 to 180 mgKOH/g.

3 . The multilayer film according to claim 1 , wherein the polyol (P) contains a (meth)acrylic polyol.

4 . The multilayer film according to claim 3 , wherein the(meth)acrylic polyol is a polymer of a (meth)acryl-based monomer, the (meth)acryl-based monomer contains a fluorine-containing (meth)acryl-based monomer (a1) and a hydroxyl group-containing (meth)acryl-based monomer (a2), and
a mass ratio of the fluorine-containing (meth)acryl-based monomer (a1) unit to the hydroxyl group-containing (meth)acryl-based monomer (a2) unit, [a mass of the fluorine-containing (meth)acryl-based monomer (a1) unit/a mass of the hydroxyl group-containing (meth)acryl-based monomer (a2) unit], in the (meth)acrylic polyol is 0.003 to 7.5.

5 . The multilayer film according to claim 4 , wherein the mass ratio of the fluorine-containing (meth)acryl-based monomer (a1) unit to the hydroxyl group-containing (meth)acryl-based monomer (a2) unit, [the mass of the fluorine-containing (meth)acryl-based monomer (a1) unit/the mass of the hydroxyl group-containing (meth)acryl-based monomer (a2) unit], in the (meth)acrylic polyol is 0.003 to 0.9.

6 . The multilayer film according to claim 4 , wherein the(meth)acryl-based monomer contains a siloxane bond-containing (meth)acryl-based monomer (a3).

7 . The multilayer film according to claim 1 , wherein the polyol (P) contains at least one kind of polyol selected from the group consisting of a polyether polyol, a polyester polyol, and a polycarbonate polyol.

8 . The multilayer film according to claim 1 , wherein the polyurethane is a reaction product of the polyol (P), the polyisocyanate (I), and a polythiol (T).

9 . The multilayer film according to claim 1 , wherein the substrate layer contains at least one of a thermoplastic resin and a thermoplastic elastomer.

10 . The multilayer film according to claim 1 , wherein the substrate layer contains a polyester-based polyurethane resin or a polyester-based polyurethane thermoplastic elastomer.

11 . A film for protecting an automobile comprising the multilayer film according to claim 1 .

12 . A two-liquid curable coating agent comprising:
a main agent including a polyol (P) having a hydroxyl value of 25 to 380 mgKOH/g and a content of fluorine atoms of 0.01 to 20% by mass; and a curing agent including a polyisocyanate (I).

Assignees

• Harima Chemicals Inc

Inventors

• Kiguchi Masao
• Matsuoka Nobuyuki
• Nakai Ryoichi

Classifications

• C09J175/04

  Polyurethanes · CPC title

• C09D175/08

  from polyethers · CPC title

• C08G18/65

  Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen {(C08G18/2805 takes precedence)} · CPC title

• C08G18/6295

  Polymers of silicium containing compounds having carbon-to-carbon double bonds · CPC title

• C08G18/6279

  containing fluorine atoms · CPC title