Methods of preparing waterborne polyurethane dispersions involving reacted units of a polyol, an acidic diol, a hydroxy functionalized polyhedral oligomeric silsesquioxane, a diisocyanate, and a chain extender. Polyurethane coatings based on these waterborne polyurethane dispersions are evaluated on their hydrophobicity (water contact angle), mechanical strength (e.g. tensile strength, Young's modulus, elongation at break), and antifouling properties.

Curable cyanoacrylate compositions are reported that comprise cyanoacrylate and a thermoplastic polyurethane (TPU) components. Such compositions are toughened cyanoacrylate compositions exhibiting long term viscosity stability when stored for prolonged periods at room temperature (25° C.). TPU components are reported having structural units in which at least one of the structural units has the formula —O—R.sup.1—O—Ar—O—R.sup.2—O—, wherein Ar is a C.sub.6-C.sub.20 aromatic group with at least one aromatic ring; R.sup.1 is a C.sub.2-C.sub.10 alkyl group; and R.sup.2 is a C.sub.2-C.sub.10 alkyl group. The thermoplastic polyurethane (TPU) component may be present in the curable cyanoacrylate composition from about 1 wt % to about 40 wt %, for example from about 2 wt % to about 30 wt %, such from about 3 wt % to about 20 wt %, suitably from about 5 wt % to about 10 wt %, based on the total weight of the composition.

Described herein is a method for preparing polyurethane foams, including (1) placing a reaction mixture into a pressurizable chamber, and (2) polymerizing the reaction mixture at an additional pressure, where the reaction mixture comprises an isocyanate, an isocyanate-reactive compound and a blowing agent, and the reaction mixture is placed into the pressurizable chamber at a packing factor of 2.0-4.0. Also described herein is a polyurethane foam prepared by such a method.

A rigid foam-forming composition including (a) at least one isocyanate component; (b) at least one polyol component; (c) at least one blowing agent; (d) at least one catalyst; (e) at least one surfactant; and (f) at least one silane component. The foam-forming composition provides a foam having an increased adhesion when the foam is adhered to a substrate. The foam-forming composition can be particularly suitable for fabricating a panel structure including a foam core disposed in between a first and second facing material.

The present invention relates to a hot-melt adhesive composition comprising at least one polyester polyol based on Betulin and at least one NCO-terminated compound as well as a method for the production of a laminated article using the inventive hot-melt adhesive composition.

A direct and simple method to control cell size in a polyurethane foam is disclosed. Polyurethane foam is made by mixing prepolymer with foam-forming ingredients comprising isocyanate and water which react to give carbon dioxide. The reaction is driven by a catalyst and results in a foam structure with cells of a particular size. Using the addition of a pre-determined amount of mineral oil, the coalescence of neighboring cells of the foam structure may be advantageously controlled to form a cell structure with a desired average cell size.

A polymer composition includes: a first proportion of an aliphatic-diisocyanate terminated polyol; a second proportion of an aromatic diisocyanate; a third proportion of an aromatic diamine curative configured to extend a chain length of the aliphatic-diisocyanate-terminated polyol and the aromatic diisocyanate; a fourth proportion of a polyester polyol configured to polymerize with the aliphatic-diisocyanate-terminated polyol; and a fifth proportion of a high functionality dendrimer configured to crosslink polymer chains of the aliphatic-diisocyanate-terminated polyol. Further, the hybrid copolymer can be configured to form a protective film layer in a foldable electronic display, the foldable electronic display including: a cover layer arranged over the protective film layer; and an array of organic light-emitting diodes arranged beneath the protective film layer.

Hydrophobic polyurethane polymers which may be useful in making synthetic leathers comprising at least two immediately consecutive repeating units according to Formula I:
(—OC(O)N—).sub.nA-NC(O)O-L(M)-  (I)
wherein n is 1 or 2, A represents the residue of an organic di- or tri-isocyanate compound, L represents a hydrocarbon group that optionally contains one or more catenary or non-catenary hetero-atoms, and M represents an oligomer comprising 2-12 (meth)acrylate units. The polyurethane polymers may additionally comprise end group(s) according to the formula -L′M wherein L′ represents a hydrocarbon group that may contain one or more catenary or non-catenary hetero-atoms. In some embodiments, M is according to Formula III: ##STR00001##
wherein Q is hydrogen or methyl, p is an integer between 2 and 12 inclusive, and Z is a hydrocarbon group which may optionally be substituted.

An alternative polyurethane composition is provided comprising a reaction product of an azidated polyol and a poly(alkynyl carbamate) allophanate prepolymer, wherein the poly(alkynyl carbamate) allophanate prepolymer comprises a reaction product of a first alkynol and a poly(alkynyl carbamate) prepolymer, in the presence of a metallo-organic compound of the formula: M(acac).sub.n, wherein, M=a metal, acac=an acetylacetonate residue, and n=2 or 3, wherein the poly(alkynyl carbamate) prepolymer comprises a reaction product of a polyisocyanate and a stoichiometric equivalent of a second alkynol, and wherein the polyisocyanate comprises isocyanate groups and uretdione groups. The inventive alternative polyurethane compositions may be used to provide solventborne or waterborne coatings, adhesives, sealants, films, elastomers, castings, foams, and composites.

An alternative polyurethane composition is provided which comprises the reaction product of a poly(alkynyl carbamate) prepolymer and an azidated polyol, wherein reaction occurs without a catalyst at a temperature of from 100° C. to 200° C., or occurs in the presence of a Cu.sup.I-containing catalyst at a temperature of from 20° C. to 140° C. The inventive alternative polyurethane compositions may be used to provide solventborne or waterborne coatings, adhesives, sealants, films, elastomers, castings, foams, and composites.