Aqueous urethane resin composition

Patent metadata

Field	Value
Publication number	US-9499654-B2
Application number	US-201214367009-A
Country	US
Kind code	B2
Filing date	Dec 20, 2012
Priority date	Dec 27, 2011
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

To provide an aqueous urethane resin composition with high reactivity, excellent drying characteristics, and the like, even under low-temperature environment.
Provided is an aqueous urethane resin composition consisting mainly of the following (A) component and containing the following (B) and (C) components:
(A) Hydrophilic polyol,
(B) Water dispersible polyisocyanate,
(C) Aspartic acid ester having a secondary amino group

First claim

The invention claimed is:

1. An aqueous resin composition comprising as separate components:
(A) a hydrophilic polyol,
(B) a water dispersible polyisocyanate, and
(C) an aspartic acid ester having a secondary amino group of formula (1)

wherein
m is an integer of 2 or more,
X is an m-valent organic group inactive to an isocyanate group at a temperature of 100° C. or less,
R 1 and R 2 are identical or different from each other and are organic groups inactive to isocyanate,
wherein the ratio of aspartic acid ester having a secondary amino group (C) to the total weight of hydrophilic polyol (A) and aspartic acid ester having a secondary amino group (C) is in a range of 15 to 50% by weight.

2. The aqueous resin composition of claim 1 , wherein the water dispersible polyisocyanate (B) is at least one polyisocyanate having a hydrophilic group or a polyisocyanate not having a hydrophilic group but having a viscosity of 2000 mPa·s/25° C. or less.

3. The aqueous resin composition of claim 1 , wherein an NCO index is in a range of 1.2 to 1.6.

4. The aqueous resin composition of claim 1 , wherein the hydrophilic polyol (A) is a polyol containing an anionic group.

5. The aqueous resin composition of claim 1 , wherein the aqueous urethane resin composition is a two component composition with a base resin comprising the hydrophilic polyol (A) and containing aspartic acid ester having a secondary amino group (C), and a hardener comprising the water dispersible polyisocyanate (B).

6. A paint, an adhesive or a sealant comprising the aqueous urethane resin composition of claim 1 .

Assignees

• Bayer Ip Gmbh
• Covestro Deutschland Ag

Inventors

• Nakao Makoto
• Morita Hiroshi

Classifications

• C08G18/3821 Primary

  Carboxylic acids; Esters thereof with monohydroxyl compounds · CPC title

• C09D175/12

  from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group · CPC title

• C08G18/6254 Primary

  Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups · CPC title

• C08G18/706

  the liquid medium being water · CPC title

• C08K3/20

  Oxides; Hydroxides {(graphene oxides C08K3/042)} · CPC title