A coating composition containing added diol functionality to a urethane, a urea, or polyurethane urea functional resin where an adipic acid dihydrazide chain extender, or free adipic acid dihydrazide active hydrogens react with the oxirane group found in glycidol is described. The combination of diisocyanate, a polyether segment, optionally at least one polyester diol segment, optionally at least one poly(tetrahydrofuran) diol segment, optionally and at least one dimethylol propionic acid diol segment, at least one dihydrazide segment and glycidol compound introduces an increased hydrophilic structure, by diol addition, in compositions that are usable as coatings, on for example, medical devices.

An alternative polyurethane composition is provided which comprises a reaction product of an azidated polyol and a poly(alkynyl carbamate) prepolymer, wherein reaction occurs at a temperature of from 20 C. to 200 C., optionally in the presence of a catalyst, wherein the poly(alkynyl carbamate) prepolymer comprises a reaction product of stoichiometric equivalents of a polyisocyanate and a component comprising 1-100% of an alkynol-ether of the formula (I): HCCROH (I), wherein R is a linear or branched ether chain having from 1 to 15 atoms, and wherein the remainder of the hydroxyl-functional component comprises a first alkynol. The inclusion of an alkynol-ether reduces the viscosity of the composition without compromising its performance. The inventive alternative polyurethane compositions may find use in providing coatings, adhesives, sealants, films, elastomers, castings, foams, and composites.

The present invention relates to a process for producing polyurethanes, preferably polyurethane foams, by reaction of compounds containing isocyanate-reactive hydrogen atoms with di- and/or polyisocyanates in the presence of one or more compounds selected from the group consisting of:

NCCHR.sup.1CONR.sup.12X(I),

NCCHR.sup.2CONR.sup.3-aryl(II),

NCCHR.sup.4CO.sub.2H(III),

[NCCHR.sup.5CO.sub.2].sub.mY.sup.m+(IV), wherein X represents NR.sup.6R.sup.7, OR.sup.8, CONR.sup.9R.sup.10 or COOR.sup.11, R.sup.1 to R.sup.12 each independently of one another represent H, an optionally substituted C.sub.1-C.sub.8 alkyl group or an optionally substituted aryl group, Y represents a monovalent or divalent cation and m represents 1 or 2.

The present invention further relates to the polyurethanes obtainable from this process, and to the use of such polyurethanes, for example in the interior of automobiles.

A waterborne one-component coating composition capable of self-crosslinking and exhibiting a gloss and hardness improvement when cured that is similar to a solventborne two-component composition. The composition includes a urethane phase including a polyurethane polymer with at least polyester diol monomer units, polycarbonate diol monomer units, and ketone-functionalized diol monomer units. The composition may include an optional acrylic phase including an acrylic polymer having monomer units selected from one of alkyl (meth)acrylate monomer units, vinyl acetate monomer units, styrene monomer units, ketone-functional vinyl monomer units, or combinations thereof. The composition includes a hydrazine-functionalized crosslinking agent configured to crosslink one of the ketone-functionalized diol monomer units, the ketone-functional vinyl monomer units, or both. The composition further includes one or more tertiary amine reaction moderators or neutralizing agents.

A method of making a silyl-terminated polyurethane in an aqueous dispersion aqueous silyl-terminated polyurethane dispersions are described. In one embodiment, the polyurethane comprises a) urethane moieties derived from the reaction of a (i) a diol; (ii) a neutralized anionic water solubilizing compound; and iii) a diisocyanate. The polyurethane also comprises b) silyl terminal groups derived from an alkoxy silane compound having the formula (R.sup.3O).sub.3SiR.sup.4Z, wherein R.sup.3 is independently hydrogen or a C.sub.1-C.sub.4 alkyl; R.sup.4 is a divalent group selected from alkylene, alkylarylene, oxyalkylene; and Z is selected from the group consisting of OH, SH, NR, NH.sub.2, wherein R is an aromatic or aliphatic cyclic group. The polyurethane also comprises c) urea moieties derived from the reaction of an isocyanate terminated prepolymer and a difunctional hydrazine or hydrazide compound.

The present invention relates to hydrophilic, i.e., water loving coatings (hereafter referred to as WLC). Polyurethane epoxy alkylene oxide coatings usable as coatings on for example, medical devices are a preferred WLC.

A method of making a silyl-terminated polyurethane in an aqueous dispersion aqueous silyl-terminated polyurethane dispersions are described. In one embodiment, the polyurethane comprises a) urethane moieties derived from the reaction of a (i) a diol; (ii) a neutralized anionic water solubilizing compound; and iii) a diisocyanate. The polyurethane also comprises b) silyl terminal groups derived from an alkoxy silane compound having the formula (R.sup.3O).sub.3SiR.sup.4Z, wherein R.sup.3 is independently hydrogen or a C.sub.1-C.sub.4 alkyl; R.sup.4 is a divalent group selected from alkylene, alkylarylene, oxyalkylene; and Z is selected from the group consisting of OH, SH, NR, NH.sub.2, wherein R is an aromatic or aliphatic cyclic group. The polyurethane also comprises c) urea moieties derived from the reaction of an isocyanate terminated prepolymer and a difunctional hydrazine or hydrazide compound.

A bionic environment-adaptive self-repairing coating as well as a preparation method and use thereof. The preparation method comprises: carrying out condensation polymerization on a first mixed reaction system comprising isocyanate and polyol to obtain a prepolymer; reacting a second mixed reaction system comprising a material containing a non-covalent hydrogen bond and/or a material containing a covalent bisulfide bond and the prepolymer to obtain a polyurethane material; and mixing the polyurethane material with a modified graphene material so that the modified graphene material is distributed in the polyurethane material in a parallel arrangement manner to obtain a composite coating with a nacreous layer structure, and then curing the composite coating to obtain the bionic environment-adaptive self-repairing coating. The bionic environment-adaptive self-repairing coating prepared in the present application has high ultimate tensile strength and excellent mechanical properties.

The invention relates to a process for producing polyurethanes using a component A comprising a polyhydrazide, a polysemicarbazide, a polysulfonyl hydrazide and/or carbodihydrazide, in particular a polyhydrazide, wherein the component A is employed in the form of a mixture C which further comprises a component B comprising a dispersion medium.