Self-emulsifying polyisocyanate composition, two-pack type coating composition and coating film

Patent metadata

Field	Value
Publication number	US-12286554-B2
Application number	US-202017595828-A
Country	US
Kind code	B2
Filing date	May 22, 2020
Priority date	May 29, 2019
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

The present invention relates to a self-emulsifying polyisocyanate composition including a reaction mixture of (a) an anionic compound having a specific structure, (b) nonionic hydrophilic group-containing monofunctional alcohol having a specific structure, (c) organic polyisocyanate, and (d) tertiary amine, a two-part coating composition that contains the composition, and a coating film that can be obtained from the coating composition.

First claim

The invention claimed is:

1. A self-emulsifying polyisocyanate composition, comprising:
a reaction mixture of (a) an anionic compound, (b) a nonionic hydrophilic group-containing monofunctional alcohol, (c) an organic polyisocyanate, and (d) a tertiary amine,
wherein the reaction mixture comprises polyisocyanate having a urethane bond and a urea bond, and
(a) the anionic compound is represented by Formula 1 described below, a content of a sulfo group in the composition is 0.05 mmol/g or more and 0.10 mmol/g or less, (b) the nonionic hydrophilic group-containing monofunctional alcohol is represented by Formula 2 described below, and a content of (b) the nonionic hydrophilic group-containing monofunctional alcohol in the composition is 2 to 10 mass %,

in the formula, R 1 indicates an alkyloxy-containing group having a structure in which oxygen atoms are inserted between carbon atoms of an alkyl group having 3 to 6 carbon atoms not to be adjacent to each other, and

in the formula, R 2 indicates an alkyl group having 1 to 4 carbon atoms, and n indicates an integer of 5 to 30.

2. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein the content of (b) the nonionic hydrophilic group-containing monofunctional alcohol in the composition is 3 to 10 mass %.

3. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein a content of an isocyanate group in (c) the organic polyisocyanate is 10 to 35 mass %.

4. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein (c) the organic polyisocyanate comprises isocyanurate-modified polyisocyanate of hexamethylene diisocyanate and/or allophanate-modified polyisocyanate of hexamethylene diisocyanate.

5. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein R 1 is a 3-methoxypropyl group, a 4-methoxybutyl group, a 3-ethoxypropyl group, or a 4-ethoxybutyl group.

6. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein R 2 is an alkyl group having 1 to 2 carbon atoms, and n is an integer of 8 to 20.

7. The self-emulsifying polyisocyanate composition according to claim 1 ,
wherein a ratio of (d) the tertiary amine to (a) the anionic compound is 0.8 to 1.2 in terms of a molar equivalent ratio.

8. A two-part coating composition, comprising:
the self-emulsifying polyisocyanate composition according to claim 1 ;
a base compound; and
an aqueous medium.

9. The two-part coating composition according to claim 8 ,
wherein the base compound is an active hydrogen group-containing polymer compound, and a molar ratio of the isocyanate group of the polyisocyanate having a urethane bond and a urea bond in the self-emulsifying polyisocyanate composition and the active hydrogen group of the base compound is 6:4 to 4:6.

10. The two-part coating composition according to claim 8 ,
wherein the base compound is an active hydrogen group-free polymer compound, and a mass ratio of the polyisocyanate having a urethane bond and a urea bond in the self-emulsifying polyisocyanate composition and the base compound is 1:9 to 3:7.

11. A coating film obtainable from the two-part coating composition according to claim 8 .

Assignees

• Tosoh Corp
• Sagami Chem Res Inst

Inventors

• Kita Motomu
• CHINSON Shimou
• Inoue Munenori
• Nagaoka Masahiro
• Adachi Hiroaki
• Maeda Aki

Classifications

• C09D175/04

  Polyurethanes · CPC title

• C08G18/706

  the liquid medium being water · CPC title

• C08G18/0828

  containing sulfonate groups or groups forming them · CPC title

• C09D5/02

  Emulsion paints {including aerosols} · CPC title

• C08G18/791

  containing isocyanurate groups · CPC title