Aqueous composition for surface coating and automotive sheet using the composition

Patent metadata

Field	Value
Publication number	US-2017313037-A1
Application number	US-201515520469-A
Country	US
Kind code	A1
Filing date	Oct 19, 2015
Priority date	Oct 20, 2014
Publication date	Nov 2, 2017
Grant date	—

Abstract

Disclosed is an aqueous composition for surface coating, including: a main ingredient comprising a first compound having at least two functional groups selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group and combinations thereof, per molecule; a curing agent comprising a second compound having at least two functional groups selected from the group consisting of an aziridine group, an isocyanate group, a carbodiimide group and combinations thereof, per molecule; and an aqueous solvent. Further, an automotive sheet using the aqueous composition for surface coating is disclosed.

First claim

1 . An aqueous composition for surface coating, comprising:
a main ingredient comprising a first compound having at least two functional groups selected from the group consisting of a carboxyl group, a hydroxyl group, an amino group and combinations thereof, per molecule; a curing agent comprising a second compound having at least two functional groups selected from the group consisting of an aziridine group, an isocyanate group, a carbodiimide group and combinations thereof, per molecule; and an aqueous solvent.

2 . The aqueous composition for surface coating of claim 1 , wherein the main ingredient and the curing agent form a polymer chain by a three-dimensional cross-linking reaction.

3 . The aqueous composition for surface coating of claim 1 , wherein the polymer chain has a crosslinking density of from 70% to 95%.

4 . The aqueous composition for surface coating of claim 2 , wherein the polymer chain and a curing agent that does not participate in the three-dimensional crosslinking reaction form an interpenetrating polymer network.

5 . The aqueous composition for surface coating of claim 1 , wherein the main ingredient is a prepolymer containing a urethane group in a backbone of the first compound.

6 . The aqueous composition for surface coating of claim 5 , wherein the second compound is mixed in an amount of 1 to 10 equivalents based on 100 equivalents of the prepolymer.

7 . The aqueous composition for surface coating of claim 5 , wherein the prepolymer has a weight average molecular weight ranging from 100 to 300,000.

8 . The aqueous composition for surface coating of claim 1 , wherein the main ingredient is a silicon-containing prepolymer comprising a siloxane group in a backbone of the first compound.

9 . The aqueous composition for surface coating of claim 8 , wherein the second compound is mixed in an amount of 1 to 10 equivalents based on 100 equivalents of the silicon-containing prepolymer.

10 . The aqueous composition for surface coating of claim 8 , wherein the silicon-containing prepolymer has a weight average molecular weight ranging from 100 to 300,000.

11 . The aqueous composition for surface coating of claim 1 , wherein the aqueous solvent is water or an alcohol.

12 . The aqueous composition for surface coating of claim 1 , wherein the aqueous composition for surface coating comprises 20 to 60% by weight of the main ingredient, 10 to 50% by weight of the curing agent, and 10 to 30% by weight of the aqueous solvent, based on the total weight of the aqueous composition for surface coating.

13 . The aqueous composition for surface coating of claim 1 , wherein, in addition to the main ingredient and the curing agent, the composition comprises at least one selected from the group consisting of silicone beads, urethane beads, acrylic beads, fluorine-containing waxes, and combinations thereof

14 . The aqueous composition for surface coating of claim 1 , wherein, in addition to the main ingredient and the curing agent, the composition further comprises at least one selected from surfactants, co-solvents, modifiers, leveling agents, thickeners, and combinations thereof.

15 . An automotive sheet, comprising:
a surface coating layer formed from the aqueous composition for surface coating defined in claim 1 ; a cover layer formed under the surface coating layer; a foaming layer formed under the cover layer; and a backing layer formed under the foaming layer.

16 . The automotive sheet of claim 15 , wherein the surface coating layer is formed by applying the aqueous composition for surface coating with a thickness of 1 μm to 20 μm, followed by drying and aging.

17 . The automotive sheet of claim 16 , wherein the aging is carried out by a primary aging at a temperature of equal to or higher than a minimum film forming temperature (MFFT), and then a secondary aging at a temperature of equal to or higher than a glass transition temperature (Tg).

18 . The automotive sheet of claim 15 , wherein a primer layer is further formed between the surface coating layer and the cover layer.

Assignees

• Lg Hausys Ltd

Inventors

• Min Chul-Hee

Classifications

• C09D201/08

  Carboxyl groups · CPC title

• C09D201/025

  containing nitrogen atoms · CPC title

• B32B2553/02

  Shock absorbing · CPC title

• B32B2266/0214

  Materials belonging to B32B27/00 · CPC title

• B32B2266/0235

  Vinyl halide, e.g. PVC, PVDC, PVF, PVDF · CPC title