Polyurethane foams are made by curing a reaction mixture that contains an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group, at least one blowing agent, at least one surfactant, at least one catalyst, and certain aldehyde-suppressing additives. Foams so produced emit low levels of formaldehyde, acetaldehyde and propionaldehyde.

The present invention relates to adhesives which are characterized in that they cure in the absence of water and at room temperature with the formation of isocyanurate groups.

This invention relates to an in-situ formed polyether polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 40 to 220 mg KOH/g. A process for preparing these in-situ formed polyether polyol blends is also disclosed. These in-situ formed polyether polyol blends are suitable for a process of preparing viscoelastic flexible polyurethane foams.

It discloses a polyether polyols for preparing flexible polyurethane foam, and a preparation method and application thereof. The method comprises the following steps: (1) carrying out a reaction on phosphorus oxychloride, epichlorohydrin, a first acidic catalyst and an inert solvent in a first microchannel reactor to obtain a chloroalkoxy phosphorus compound; (2) carrying out a reaction on the chloroalkoxy phosphorus compound, glycidol, a second acidic catalyst and an inert solvent in a second microchannel reactor to obtain a hydroxy compound; (3) carrying out a ring-opening reaction on the hydroxy compound, epoxy vegetable oil, a basic catalyst and an inert solvent in a third microchannel reactor to obtain a vegetable oil polyol; and (4) carrying out an addition polymerization reaction on the vegetable oil polyol, propylene oxide and an inert solvent in a fourth microchannel reactor to obtain the polyether polyols for preparing flexible polyurethane foam.

This disclosure generally provides compositions with reduced aldehyde emissions and more specifically provides polyurethane compositions useful in means of transport such as interior part of cars, wherein the polyurethane composition comprising: (a) a polyfunctional isocyanate; (b) an isocyanate reactive composition; (c) a compound of the formula (I), (d) a primary amine containing compound; and (e) a catalyst.

Provided is a solventless two-component adhesive having excellent processed appearance and processability while exhibiting excellent adhesive strength even with aging at room temperature (around 25° C.) and in a short period of 12 hours. Provided are a two-component curable adhesive containing a polyisocyanate composition (X) containing a polyisocyanate (A) and a resin composition (Y) containing a polyol (B) as essential components, the two-component curable adhesive satisfying (1) to (3), as well as a laminated film and a packaging body produced using the two-component curable adhesive: (1) a tensile shear adhesive strength (N1) when provided between two bases and after a lapse of 30 minutes after pressure bonding is 0.5 N/cm.sup.2 or more; (2) the tensile shear adhesive strength (N1) when provided between two bases and after a lapse of 30 minutes after pressure bonding is three times or less a tensile shear adhesive strength (N2) after a lapse of 10 minutes after pressure bonding; and (3) a tensile shear adhesive strength (N3) when provided between two bases and after a lapse of 5 hours after pressure bonding is 20 N/cm.sup.2 or more.

A quick-drying solvent-free sag-resistant polyurethane waterproof coating and preparation method therefor, raw materials therefor comprising a polyurethane prepolymer, a plasticizer, a dispersant, a filler, a dehydrant, a catalyst, a defoamant, and an oxazolidine reactive diluent. The catalyst is composed of pentamethyl dipropylene triamine, tetramethylethylenediamine, and 1,8-diazabicyclo[5.4.0]undecene. Raw materials of the polyurethane prepolymer comprise a polyether diol, a polyether triol, an isocyanate, and a chain extender. The prepolymer is prepared by means of the following method: 1) measuring out the raw materials for the polyurethane prepolymer, and reacting the polyether diol with the isocyanate until reaction is complete; 2) then adding the polyether triol for reaction until reaction is complete; 3) then adding the chain extender for reaction, completing preparation. The waterproof coating preparation method is: i) preparing the polyurethane prepolymer; ii) mixing the prepared polyurethane prepolymer with the rest of the raw materials for the waterproof coating to obtain the final product. The present waterproof coating features such advantages as exceptional film-forming speed and sag resistance, and low viscosity.

Provided is a polyurethane foam having excellent heat resistance and the like. The polyurethane foam is obtained from a material that contains a polyol and a polyisocyanate, in which the polyol contains a polyester polyol, the polyisocyanate contains a diphenylmethane diisocyanate-based isocyanate, it is preferable that the polyester polyol has one or more side chains composed of an alkyl group, and the polyurethane foam may be used as a soundproof material for vehicles.

Polyurethane foams are made by curing a reaction mixture that contains an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group, at least one blowing agent, at least one surfactant, at least one catalyst, and certain aldehyde-suppressing additives. Foams so produced emit low levels of formaldehyde, acetaldehyde and propionaldehyde.

Polyurethane foams are made by curing a reaction mixture that contains an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight of at least 200 per isocyanate-reactive group, at least one blowing agent, at least one surfactant and at least one catalyst, at least one cyclic 1,3-diketone compound, at least one aminoalcohol or alkylhydroxylamine and an alkali metal, phosphonium or ammonium sulfite. Foams so produced emit low levels of formaldehyde, acetaldehyde, acrolein and propionaldehyde.