The present invention provides reactive multi-functional dialkyl phosphinate compound(s), serving as highly efficient reactive flame retardants in flexible polyurethane foams. The invention further provides fire-retarded polyurethane compositions comprising said multi-functional dialkyl phosphinate compound and applications containing the same.

A method for preparing a transparent flexible polyurethane film includes the following steps: (1) mixing a hydroxyl-terminated polyalkylene carbonate diol, a diisocyanate compound, 2,2′-dithiodiethanol, dibutyltin dilaurate and a chloroalkane solvent, and then reacting at 40 to 60° C. for 0.5 to 3 h to obtain an isocyanate-terminated oligomer solution; and (2) adding a polyol cross-linking agent, a bistrifluoromethanesulfonimide lithium salt and a 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt to the isocyanate-terminated oligomer solution, reacting at 40 to 60° C. for 0.5 to 1.5 h, removing the chloroalkane solvent to obtain the transparent flexible polyurethane film.

[Purpose] To provide a thermosetting composition with which it is possible to obtain paint films which not only display stain resistance for a short period after application, but with which excellent stain resistance can also be expected for longer periods, and which comply with the paint film properties required for painted steel sheet such as water resistance and bending workability, and have high environmental protection and safety qualities. [Solution] The present invention relates to a thermosetting composition, wherein it contains, as essential components, (A) a polyester resin of number average molecular weight 1,000-10,000 and hydroxyl value 5-200 mg KOH/g and, (B) 0.5 to 2.0 equivalents, relative to the hydroxyl groups of the aforesaid component (A), of a compound (B) which is a blocked aliphatic polyisocyanate compound having reactivity to the hydroxyl groups of component (A), wherein the blocks are methyl ethyl ketone oxime and/or ε-caprolactam, (C) 0.05 to 5 mass %, relative to the total resin solids mass of component (A) and component (B), of an organotin compound represented by the following general formula (I) [Chem.1] R.sup.1—Sn-(O)C═(O)—R.sup.2).sub.3 (I) (R.sup.1 in the formula represents an organic group wherein it has 1-24 carbons, and is directly bound to the Sn atom via a C atom. R.sup.2 represents an organic group wherein it has 1-24 carbons, and is directly bound to the C atom of the (C═O) via a C atom), and (D) 0.5 to 50 mass %, relative to the total resin solids mass of component (A) and component (B), of an organosilicate represented by the following general formula (II) and/or a condensation product thereof [Chem.2] (R.sup.3, R.sup.4, R.sup.5 and R.sup.6 in the formula are each a hydrogen atom or 1-10 carbon organic group, and may be the same or different, n is 1). ##STR00001##

The present disclosure describes a low gloss polyurethane one component powder coating composition comprising 90 to 100 wt % of a resin system comprising a thermosetting resin, an isocyanate curing agent for reacting with the thermosetting resin, and a polycarbonate diol, wherein: the thermosetting resin comprises a first hydroxyl functional polyester resin (i) having a hydroxyl value of between 200 and 250 mgKOH/g and a second hydroxyl functional polyester resin (ii) having a hydroxyl value of between 20 and 40 mgKOH/g, the weight ratio of (i):(ii) ranges from 15:85 to 35:65, the isocyanate curing agent comprises at least one unblocked uretdione curing agent, the ratio of isocyanate groups of the curing agent to hydroxyl group of the thermosetting ranges between 0.8 to 1.2, and the total weight % of the polycarbonate diol in the coating composition ranges from 1 to 10 wt % based on the total weight of the coating composition.

A process for producing rigid PUR/PIR foams via the reaction of a reaction mixture comprising A1 an isocyanate-reactive component, A2 a flame retardant, A3 a blowing agent, A4 a catalyst, and A5 optionally auxiliaries and additives with B an organic polyisocyanate component. Component A1 comprises a diurethane diol A1.1 and a compound A1.2 selected from the group consisting of polyether polyol, polyester polyol, polyether carbonate polyol, and polyether ester polyol. Also disclosed is a rigid PUR/PIR foam, an insulating material, a composite element, and a mixture.

A biodegradable foam which includes a poly-ester-based polyurethane foam and a mixture comprised of a soil-dwelling carbon-digesting bacteria embedded in a carrier compound. The mixture of the soil-dwelling carbon-digesting bacteria is homogenously dispersed throughout the polyester-based polyurethane foam. This biodegradable foam exhibits biodegradation rates higher than a polyester-based polyurethane foam absent the soil-dwelling carbon-digesting bacteria.

The present disclosure provides a self-healing coating composition precursor that includes a soft segment precursor, a hard segment precursor, and a diol. The present disclosure also provides self-healing coatings including the same for scratches and deep cracks and/or anti-fouling property, and methods of preparation and use thereof.

The present invention provides an aqueous polyurethane dispersion (PUD) which comprises (1) a polyester polyurethane dispersion which is free of solubilizing agents having carboxyl functionality and (2) a polycarbodiimide dispersion. These dispersions have stabilized performance properties. In addition, the polycarbodiimide dispersion has been found to restore the physical performance of an aqueous polyester polyurethane dispersion in which the performance has degraded due to the polyester component.

Provided is a photochromic optical article obtained by bonding a pair of optical article plates to each other with an adhesive layer that contains (A) a photochromic compound and (B) a urethane resin, wherein (B) the urethane resin is obtained by polymerizing: (B1) a polyiso(thio)cyanate compound having two or more iso(thio)cyanate groups in a molecule; (B2) a poly(thi)ol compound having, in a molecule, two or more active hydrogen-containing groups selected from a hydroxyl group and a thiol group; and (B3) a mono(thi)ol compound having, in a molecule, one active hydrogen-containing group selected from a hydroxyl group and a thiol group. Also provided is a method for manufacturing the photochromic optical article.

The polymerizable composition for optical materials of the present invention includes a polyester polyol (a), a compound (b) of which light absorption characteristics vary by sensing changes in environment; and a polymerization reactive compound (c).