The present invention provides a novel polycarbonate diol and a polyurethane using the polycarbonate diol as raw materials. The novel polycarbonate diol produces polycarbonate diol-based polyurethane which has a high degree of hardness, superior abrasion resistance, and superior hydrophilicity, and is usable for an application such as a paint, a coating agent, a synthetic leather, an artificial leather, and a highly-functional elastomers, or the like. The present invention also provides an active-energy radiation curable polymer composition giving a cured film having a superior contamination resistance and high degree of hardness. The present invention is obtained, for example, by reacting specific two types of diols with diester carbonate in the presence of a transesterification catalyst being a compound using a metal of Group 1 or 2 on the periodic table. The present invention provides a polycarbonate diol wherein the metal content of the transesterification catalyst is 100 weight ppm or less, a polyurethane obtainable by using this polycarbonate diol and an active-energy radiation curable polymer composition containing the urethane(meth)acrylate oligomer which is obtained from the polycarbonate diol.

Provided is a compound capable of forming a coating layer that has excellent scratch resistance and still has stain resistance (in particular, stain resistance against hair dyes) and workability (impact resistance) both at satisfactory levels. The urethane (meth)acrylate has a cyclic structure in a molecule. The urethane (meth)acrylate has a total weight of carbon, oxygen, nitrogen, and sulfur atoms constituting the ring or rings of the cyclic structure of 10 percent by weight or more based on the total amount (100 percent by weight) of the urethane (meth)acrylate. The urethane (meth)acrylate also has an average number of functional groups of 3.5 to 4.5.

Provided is a compound capable of forming a coating layer that has excellent scratch resistance and still has stain resistance (in particular, stain resistance against hair dyes) and workability (impact resistance) both at satisfactory levels. The urethane (meth)acrylate has a cyclic structure in a molecule. The urethane (meth)acrylate has a total weight of carbon, oxygen, nitrogen, and sulfur atoms constituting the ring or rings of the cyclic structure of 10 percent by weight or more based on the total amount (100 percent by weight) of the urethane (meth)acrylate. The urethane (meth)acrylate also has an average number of functional groups of 3.5 to 4.5.

Described herein are two-component systems, a composite part comprising a coating made of the two-component system, a process for producing a composite part and a use of special siloxane-containing compounds. The addition of a polysiloxane-containing component, either chemically incorporated into the (meth)acrylate component or physically mixed into this component, results in an improved adhesion to a thermoplastic carrier.

A dispersion liquid contains antimony-doped tin oxide (ATO) particles and a solvent, a content of the antimony-doped tin oxide particles is 40% by mass or more, a volume average particle diameter of the antimony-doped tin oxide particles is 90 nm or less, and, in a color space by the L*a*b* color system, an L* value is 13.0 or less, an a* value is −2.0 or more and 0.0 or less, and a b* value is −13.0 or more and −10.0 or less.

A dispersion liquid contains antimony-doped tin oxide (ATO) particles and a solvent, a content of the antimony-doped tin oxide particles is 40% by mass or more, a volume average particle diameter of the antimony-doped tin oxide particles is 90 nm or less, and, in a color space by the L*a*b* color system, an L* value is 13.0 or less, an a* value is −2.0 or more and 0.0 or less, and a b* value is −13.0 or more and −10.0 or less.

The present invention provides the following aqueous coating composition. The aqueous coating composition comprises resin particles (A) having an average particle diameter of 300 to 1000 nm, a polyoxyalkylene group-containing polyol (B) having a number average molecular weight of 300 to 2000 and/or a diester compound (C), and a crosslinking agent (D); wherein the total solids content of the polyoxyalkylene group-containing polyol (B) and the diester compound (C) is 5 to 25 mass % based on the total solids content of the resin particles (A), the polyoxyalkylene group-containing polyol (B), the diester compound (C), and the crosslinking agent (D).

The present invention provides the following aqueous coating composition. The aqueous coating composition comprises resin particles (A) having an average particle diameter of 300 to 1000 nm, a polyoxyalkylene group-containing polyol (B) having a number average molecular weight of 300 to 2000 and/or a diester compound (C), and a crosslinking agent (D); wherein the total solids content of the polyoxyalkylene group-containing polyol (B) and the diester compound (C) is 5 to 25 mass % based on the total solids content of the resin particles (A), the polyoxyalkylene group-containing polyol (B), the diester compound (C), and the crosslinking agent (D).

An elastic barrier coating composition includes an aqueous dispersion of core-shell particles and an elastomeric polymer that is different from the aqueous dispersed core-shell particles. The aqueous dispersion of core-shell particles include an aqueous medium and core-shell particles dispersed in the aqueous medium. The core-shell particles have a polymeric core at least partially encapsulated by a polymeric shell in which the polymeric shell includes: (i) a barrier segment comprising aromatic groups and urethane linkages, urea linkages, or a combination thereof; and (ii) an elastomeric segment that is different from (i). The barrier segment includes at least 30 weight % of the polymeric shell based on the total solids weight of the polymeric shell. Further, the polymeric shell is covalently bonded to at least a portion of the polymeric core.

An elastic barrier coating composition includes an aqueous dispersion of core-shell particles and an elastomeric polymer that is different from the aqueous dispersed core-shell particles. The aqueous dispersion of core-shell particles include an aqueous medium and core-shell particles dispersed in the aqueous medium. The core-shell particles have a polymeric core at least partially encapsulated by a polymeric shell in which the polymeric shell includes: (i) a barrier segment comprising aromatic groups and urethane linkages, urea linkages, or a combination thereof; and (ii) an elastomeric segment that is different from (i). The barrier segment includes at least 30 weight % of the polymeric shell based on the total solids weight of the polymeric shell. Further, the polymeric shell is covalently bonded to at least a portion of the polymeric core.