Polyol premixes and thermally insulating rigid polyurethane foams, such as those that can be used as a thermal insulation medium in the construction of refrigerated storage devices, are disclosed. A polymer polyol having a OH number of greater than 260 mg KOH/g is utilized. The resulting polyurethane foams can exhibit improved thermal insulation properties without sacrificing other important physical and processing properties.

Provided are a solvent-free two-component type adhesive capable of guaranteeing a practical packaging property, with an excellent curing property and significantly shortening aging time, a laminated film using the same, and a polyol composition for an adhesive. An adhesive, characterized in comprising a polyisocyanate composition (X) containing a polyisocyanate (A), and a polyol composition (Y) containing a polyol (C) and a tertiary amine compound (B) having multiple hydroxyl groups, as necessary components.

The present invention relates to a composition comprising 10 to less than 50 wt.-% of at least one oligomeric polyisocyanate a-1) based on hexamethylene diisocyanate and more than 50 to 90 wt.-% of at least one polyisocyanate a-2) based on isophorone diisocyanate, comprising monomeric isophorone diisocyanate and at least one oligomeric isophorone diisocyanate, and an isocyanate-reactive component selected from the group consisting of polyester polyol, polyether polyol and mixtures thereof. It has been shown that the above mentioned mixture of the specific isocyanate group containing components improves the thermal and mechanical properties of a cured composition. Thus prepared molded articles are particularly suitable for the preparation of spectacle lenses, inter alia due to these properties.

Polyurethane foams which are highly flame resistant are described, as well as the production of such polyurethane foams by the reaction between a natural polyol, such as sucrose or a blend of mono- or disaccharides in place of the standard hydrocarbon-based polyol component, a polyisocyanate and water in the presence of a suitable polyurethane forming catalyst and a flame retardant, and optionally one or more components such as surfactants and/or emulsifiers. The resultant polyurethane foam has a bio-based solid content ranging from about 17% to 30%, may be formulated in a variety of foam densities for a variety of applications, and exhibits a high degree of fire and burn resistance, as exhibited by the flame spread index and the smoke spread values.

Polyether polyols are described that are an alkoxylation reaction product of an H-functional starter and an alkylene oxide, in which the H-functional starter includes an amino diphenylamine. Methods for producing such polyether polyols, as well as to the use of such polyether polyols in the production of flexible polyurethane foams is also described.

Provided is an adhesive composition comprising (A) one or more polyisocyanate and (B) one or more polymeric polyol, wherein said polymeric polyol is a reaction product of (I) a polyol initiator, wherein said polyol initiator is a reaction product of (a) one or more dihydroxy tertiary amine compound, and (b) a polyhydroxy alcohol, and (II) one or more epoxide compound or one or more glycidyl ether compound or a mixture thereof; wherein said adhesive composition contains solvent in an amount of 0 to 5% by weight based on the weight of said adhesive composition. Also provided is a method of bonding substrates using such an adhesive composition.

Polyurethane composites and methods of preparing polyurethane composites are described herein. The polyurethane composite can comprise (a) a polyurethane formed by the reaction of (i) one or more isocyanates selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, and (ii) one or more polyols; (b) fly ash comprising 50% or greater by weight, fly ash particles having a particle size of from 0.2 micron to 100 microns; and (c) a coarse filler material comprising 80% or greater by weight, filler particles having a particle size of from greater than 250 microns to 10 mm. The coarse filler material can be present in the composite in an amount of from 1% to 40% by weight, based on the total weight of the composite. The weight ratio of the fly ash to the coarse filler material can be from 9:1 to 200:1.

Processes for making a molded flexible foam. The processes include: (a) depositing a foam-forming reaction mixture onto a surface of a mold cavity, and (b) allowing the foam-forming reaction mixture to react in the mold cavity. The foam-forming reaction mixture comprises: (1) a polyisocyanate present in an amount of less than 45% by weight, based on the total weight of the foam-forming reaction mixture; (2) an isocyanate-reactive composition comprising at least 50% by weight, based on the total weight of polyol in the isocyanate-reactive composition, of a polyether polyol having a functionality of greater than 2, an oxyethylene content of 0 to 50% by weight, based on the total weight of the polyether polyol, more than 50 mol % of primary OH groups, and an OH number of 8 to 112 mg KOH/g; (3) a blowing agent comprising water present in an amount of at least 0.5% by weight, based on the total weight of the foam-forming reaction mixture; and (4) a tin-free metallic catalyst composition comprising a bismuth-based catalyst and a zinc-based catalyst.

Embodiments of the present disclosure are directed towards foam formulations that include a high functionality polyether polyol, an aromatic polyether polyol, an amine initiated aliphatic polyether polyol, and a diol.

The present invention relates to a process for producing a polyurethane elastomer, a polyurethane elastomer produced by the process, and the use of the polyurethane elastomer in a glass encapsulation/elastic gasket or the like. The process mainly includes adding a hindered amine light stabilizer to the isocyanate-containing component A. Its reaction with the organotin catalyst in the isocyanate reactive component (i.e. component B), which may cause a loss of the catalytic performance of the catalyst, is avoided. The curing speed of the polyurethane elastomer is increased, thereby the production efficiency is improved and costs are reduced.