An aqueous polyurethane dispersion comprising at least one isocyanate terminated polyurethane prepolymer prepared by reacting in the presence of at least one pyrrolidone selected from the group consisting of N-n-butylpyrrolidone, N-isobutylpyrrolidone, N-sec-butylpyrrolidone and N-tert-butylpyrrolidone, a mixture (M) which comprises: at least one polyisocyanate compound (a), at least one polyol compound (b), having a molecular weight Mw of 200 to 8000 and a hydroxyl functionality of 1.5 to 6, and at least one water dispersible enhancing component having at least one hydrophilic group or potentially hydrophilic group in water.

The present invention provides a partially neutralized aqueous polyurethane dispersion (PUD) containing an amorphous polyester, wherein the dispersion is from about 70% to about 90% neutralized with a sterically hindered amine. The partially neutralized aqueous polyurethane dispersion (PUD) may be used to provide coatings, adhesives, sealants, paints, primers, and topcoats having excellent chemical resistance to aggressive chemicals such as isopropanol.

The present invention provides a partially neutralized aqueous polyurethane dispersion (PUD) containing an amorphous polyester, wherein the dispersion is from about 70% to about 90% neutralized with a sterically hindered amine. The partially neutralized aqueous polyurethane dispersion (PUD) may be used to provide coatings, adhesives, sealants, paints, primers, and topcoats having excellent chemical resistance to aggressive chemicals such as isopropanol.

The present invention relates to a method for the preparation of a low odor polyether polyol, including: a) providing a basic polyether polyol which comprises one or more aldehyde compounds in an amount of lower than 2 wt. %, based on the amount of said basic polyether polyol as 100 wt. %; b) adding to said basic polyether polyol an aldehyde trapping agent and said aldehyde trapping agent is reacted with said one or more aldehyde compounds to remove said one or more aldehyde compounds, wherein said aldehyde trapping agent is in an amount of 0.1 to 5 wt. %, based on the weight of said basic polyether polyol as 100 wt. %; and c) removing the excess aldehyde trapping agent to obtain said low odor polyether polyol. The present invention also relates to the low odor polyether polyol prepared by said method.

A coating composition including: an aqueous dispersion of self-crosslinkable core-shell particles, where the core-shell particles include (1) a polymeric core at least partially encapsulated by (2) a polymeric shell having urethane linkages, keto and/or aldo functional groups, and hydrazide functional groups, where the polymeric core is covalently bonded to at least a portion of the polymeric shell, and an acrylic polymer, where the acrylic polymer is non-reactive with the polymeric core and the polymeric shell. A substrate coated with a coating formed from the coating composition and a method of improving stain resistance of a substrate are also disclosed.

A coating composition including: an aqueous dispersion of self-crosslinkable core-shell particles, where the core-shell particles include (1) a polymeric core at least partially encapsulated by (2) a polymeric shell having urethane linkages, keto and/or aldo functional groups, and hydrazide functional groups, where the polymeric core is covalently bonded to at least a portion of the polymeric shell, and an acrylic polymer, where the acrylic polymer is non-reactive with the polymeric core and the polymeric shell. A substrate coated with a coating formed from the coating composition and a method of improving stain resistance of a substrate are also disclosed.

Disclosed is a carboxy group-containing aqueous resin composition containing a carboxy group-containing aqueous resin and a polycarbodiimide compound (X) represented by the following general formula (1):

##STR00001##

wherein R.sup.1 represents a residue obtained by removing a functional group capable of reacting with an isocyanate from a hydrophilic compound having the functional group capable of reacting with an isocyanate; R.sup.2 represents a divalent residue obtained by removing isocyanate groups from a diisocyanate compound; R.sup.3 represents a divalent residue obtained by removing hydroxy groups from a glycol compound; X represents a group to be formed through a reaction between the hydrophilic compound and the diisocyanate compound; n1 represents a number of 1 to 10; n2 represents a number of 1 to 10; m represents a number of 1 to 5; and plural R.sup.1's may be the same or different and plural R.sup.2's may be the same or different.

Disclosed is a carboxy group-containing aqueous resin composition containing a carboxy group-containing aqueous resin and a polycarbodiimide compound (X) represented by the following general formula (1):

##STR00001##

wherein R.sup.1 represents a residue obtained by removing a functional group capable of reacting with an isocyanate from a hydrophilic compound having the functional group capable of reacting with an isocyanate; R.sup.2 represents a divalent residue obtained by removing isocyanate groups from a diisocyanate compound; R.sup.3 represents a divalent residue obtained by removing hydroxy groups from a glycol compound; X represents a group to be formed through a reaction between the hydrophilic compound and the diisocyanate compound; n1 represents a number of 1 to 10; n2 represents a number of 1 to 10; m represents a number of 1 to 5; and plural R.sup.1's may be the same or different and plural R.sup.2's may be the same or different.

A coating composition is prepared from an aqueous dispersion of a mixture of (i) urethane acrylate resin particles; (ii) acrylic resin particles; and (iii) a matting agent. A method of imparting stain resistance to a substrate, comprising applying the coating composition to at least a portion of the substrate.

A coating composition is prepared from an aqueous dispersion of a mixture of (i) urethane acrylate resin particles; (ii) acrylic resin particles; and (iii) a matting agent. A method of imparting stain resistance to a substrate, comprising applying the coating composition to at least a portion of the substrate.