The invention relates to an aqueous dispersion for use as open time improver in a coating composition which aqueous polymer dispersion comprises a first polymer having a number average molecular weight (Mn) of from 2,000 to 120,000 (determined by gel permeation chromatography using a mixture of tetrahydrofurane and acetic acid as eluent), an acid value of from 30 to 150 mg KOH/g, and an ethylene-oxide wt % (on total solid polymer) of from 1 to 20 wt %, said first polymer dispersion being obtainable by free radical polymerization of a monomer mixture in the presence of at least one free-radical initiator and at least one surfactant, said monomer mixture comprising: a) 5 to 20 wt %, preferably 7 to 10 wt %, acid functional ethylenically unsaturated monomers or precursors thereof or ethylenically unsaturated monomers comprising ionic group precursors; b) 5 to 25 wt %, preferably 7 to 20 wt %, ethylenically unsaturated monomers containing polyethylene oxide, polyethylene glycol or mono-alkoxypolyethylene glycol moeity c) up to 90 wt % of non-ionic ethylenically unsaturated monomers other than a) or b); d) 0 to 10 wt % ethylenically unsaturated monomers with a functional group for cross-linking e) 0 to 10 wt % of chain transfer agents; f) up to 90 wt % non-ionic ethylenically unsaturated monomers other than c), wherein 30 to 90 wt %, more preferably 60 to 80 wt % comprise crosslinkable groups or precursors thereof; wherein the sum of a) through f) is 100 wt %.

The invention further relates to a method for making the first polymer dispersion, the use of said aqueous dispersion as an open time improver in a coating composition, to aqueous coating compositions comprising a blend of at least a first aqueous polymer dispersion and a second aqueous polymer dispersion comprising a film-forming second polymer and to a method for making said coating composition

The invention relates to thermosetting powder coating compositions as disclosed herein, said compositions comprising one or more unsaturated resins comprising ethylenic unsaturations, one or more curing agents, and one or more thermal radical initiators, wherein at least one of the initiators is a peroxydicarbonate-X. The invention further relates to a process for making said thermosetting powder coating compositions and processes for coating an article with said thermosetting powder coating compositions. The invention further relates to cured thermosetting powder coating compositions obtained by curing of the thermosetting powder coating compositions of the invention. The invention further relates to an article having coated thereon said thermosetting powder coating composition as well as to an article having coated and cured thereon said thermosetting powder coating composition. The invention further relates to the use of said thermosetting powder coating compositions, to the use of an article having coated thereon said thermosetting powder coating compositions and to the use of an article having coated and cured thereon said thermosetting powder coating compositions. The invention further relates to various uses of either the thermosetting powder coating compositions of the invention, or the cured thermosetting powder coating compositions of the invention or of articles having coated thereon the thermosetting powder coating composition of the invention, or of articles having coated and cured thereon the thermosetting powder coating composition of the invention. The invention further relates to a method for enabling the fast heat-curing of a thermosetting powder coating composition at low temperature. The invention further relates to a method for enhancing the chemical resistance of a powder coating obtained by heat curing of the thermosetting powder coating composition of the invention at low temperature.

The present invention relates to hydrophilized polyurethanes having a particularly high content of hydroxy-functional, unsaturated triglycerides, to a process for preparing polyurethane dispersions based thereon, to the use of the dispersions as binders in oxidatively drying coating materials having particularly high chemical resistance, and to articles and substrates coated with these coating materials.

The present invention relates to hydrophilized polyurethanes having a particularly high content of hydroxy-functional, unsaturated triglycerides, to a process for preparing polyurethane dispersions based thereon, to the use of the dispersions as binders in oxidatively drying coating materials having particularly high chemical resistance, and to articles and substrates coated with these coating materials.

There is provided a composition for forming a protective film against an aqueous hydrogen peroxide solution, the composition comprising a resin; a compound of the following Formula (1a), (1b), or (1c):

##STR00001## (wherein X is a carbonyl group or a methylene group; 1 and m are each independently an integer of 0 to 5 so as to satisfy the relation: 31+m10; n is an integer of 2 to 5; u and v are each independently an integer of 0 to 4 so as to satisfy the relation: 3u+v8; R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently a hydrogen atom, a hydroxy group, a C.sub.1-10 hydrocarbon group optionally having at least one hydroxy group as a substituent and optionally having at least one double bond in a main chain, or a C.sub.6-20 aryl group optionally having at least one hydroxy group as a substituent; when R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each the C.sub.1-10 hydrocarbon group, R.sup.1 and R.sup.2 optionally form a benzene ring together with a ring carbon atom to which R.sup.1 and R.sup.2 are bonded, R.sup.3 and R.sup.4 optionally form a benzene ring together with a ring carbon atom to which R.sup.3 and R.sup.4 are bonded, or the benzene ring optionally has at least one hydroxy group as a substituent; and j and k are each independently 0 or 1); a crosslinking agent; a crosslinking catalyst; and a solvent, wherein the amount of the compound of Formula (1a), (1b), or (1c) is at most 80% by mass relative to the amount of the resin, and the amount of the crosslinking agent is 5% by mass to 40% by mass relative to the amount of the resin.

There is provided a composition for forming a protective film against an aqueous hydrogen peroxide solution, the composition comprising a resin; a compound of the following Formula (1a), (1b), or (1c):

##STR00001## (wherein X is a carbonyl group or a methylene group; 1 and m are each independently an integer of 0 to 5 so as to satisfy the relation: 31+m10; n is an integer of 2 to 5; u and v are each independently an integer of 0 to 4 so as to satisfy the relation: 3u+v8; R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each independently a hydrogen atom, a hydroxy group, a C.sub.1-10 hydrocarbon group optionally having at least one hydroxy group as a substituent and optionally having at least one double bond in a main chain, or a C.sub.6-20 aryl group optionally having at least one hydroxy group as a substituent; when R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are each the C.sub.1-10 hydrocarbon group, R.sup.1 and R.sup.2 optionally form a benzene ring together with a ring carbon atom to which R.sup.1 and R.sup.2 are bonded, R.sup.3 and R.sup.4 optionally form a benzene ring together with a ring carbon atom to which R.sup.3 and R.sup.4 are bonded, or the benzene ring optionally has at least one hydroxy group as a substituent; and j and k are each independently 0 or 1); a crosslinking agent; a crosslinking catalyst; and a solvent, wherein the amount of the compound of Formula (1a), (1b), or (1c) is at most 80% by mass relative to the amount of the resin, and the amount of the crosslinking agent is 5% by mass to 40% by mass relative to the amount of the resin.

A water-based coating composition including: a polyol; a polyisocyanate; a hydrophobic curing catalyst which is made of an organometallic compound containing at least one metal atom selected from the group consisting of Sn, Bi, Zr, Ti, and Al and of which solubility in water under conditions of atmospheric pressure at 20 C. is 1 g/100 ml or less; and a nonionic surfactant of which an HLB value determined by a Griffin method is 10 to 15.

A water-based coating composition including: a polyol; a polyisocyanate; a hydrophobic curing catalyst which is made of an organometallic compound containing at least one metal atom selected from the group consisting of Sn, Bi, Zr, Ti, and Al and of which solubility in water under conditions of atmospheric pressure at 20 C. is 1 g/100 ml or less; and a nonionic surfactant of which an HLB value determined by a Griffin method is 10 to 15.

A mixture of water-emulsifiable isocyanates is described. The mixture contains (A) at least one polyisocyanate (a), (B) at least one emulsifier obtained by reacting at least one polyisocyanate with at least one polyether alcohol having a molecular weight of less than 400 g/mol, (C) at least one emulsifier obtained by reacting at least one polyisocyanate with at least one polyether alcohol having a molecular weight of greater than 450 g/mol, and (D) optionally at least one emulsifier obtained by reacting a polyisocyanate with at least one compound (d) having at least one hydrophilic, non-isocyanate-reactive group and precisely one isocyanate-reactive group (group D2). The weight ratio of component (B) to component (C) in the mixture is from 30:70 to 70:30, preferably from 40:60 to 60:40.

A mixture of water-emulsifiable isocyanates is described. The mixture contains (A) at least one polyisocyanate (a), (B) at least one emulsifier obtained by reacting at least one polyisocyanate with at least one polyether alcohol having a molecular weight of less than 400 g/mol, (C) at least one emulsifier obtained by reacting at least one polyisocyanate with at least one polyether alcohol having a molecular weight of greater than 450 g/mol, and (D) optionally at least one emulsifier obtained by reacting a polyisocyanate with at least one compound (d) having at least one hydrophilic, non-isocyanate-reactive group and precisely one isocyanate-reactive group (group D2). The weight ratio of component (B) to component (C) in the mixture is from 30:70 to 70:30, preferably from 40:60 to 60:40.