Aqueous urethane resin composition
View Patent ↗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
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 .