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.

Bioactive liquid formulations are formed of combinations of absorbable, segmented aliphatic polyurethane compositions and liquid polyether for use as vehicles for the controlled release of at least one active agent for the conventional and unconventional treatment of different forms of cancer and the management of at least one type of bacterial, fungal, and viral infection.

The present invention relates to a polyurethane which is the reaction product of a polyisocyanate and polyester, wherein said polyester is formed from a dimer fatty acid, a C.sub.2 to C.sub.4 diol, and a C.sub.8 to C.sub.16 dicarboxylic acid or C.sub.6 to C.sub.12 lactide. The inventions also relates to a polyester for use in forming the polyurethane of the first aspect, said polyester formed from a dimer fatty acid, a C.sub.2 to C.sub.4 diol, and a C.sub.8 to C.sub.16 dicarboxylic acid or C.sub.6 to C.sub.12 lactide.

The present invention in general relates to acrylate end-capped urethane-based polymers, which are in particular characterized by the presence of at least 3 acrylate end-groups, thereby making them particularly suitable for further processing using multiple kinds of technologies such as 2-photon polymerization, stereolithography (SLA printing), electrospinning, film casting, porogen leaching, extrusion based 3D-printing, spray drying, cryogenic treatment, coatings, cross-linkable micelles, spincoating, and electrospraying.

The present invention aims to provide a polyol composition capable of producing a flexible polyurethane foam having excellent low resilience at room temperature and good breathability. The present invention provides a polyol composition (C) for producing flexible polyurethane foam, containing a polyester polyol (A) and a polyether polyol (B), wherein the followings (1) to (4) are satisfied: (1) the polyol composition (C) has an ester group concentration of 0.4 to 4.0 mmol/g based on the weight of the polyol composition (C); (2) the polyol composition (C) has an oxyethylene group unit content of 15 to 40 wt % based on the weight of the polyol composition (C); (3) the polyester polyol (A) includes a polyester polyol (A1) having two to four hydroxy groups in one molecule obtained by polymerization of a raw material containing a compound (a) having multiple hydroxyl groups and a polycarboxylic acid or acid anhydride of the polycarboxylic acid; and (4) the polyether polyol (B) includes an oxyethylene group-containing polyether polyol (B1).

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.

A low-VOC, two-component polyurethane adhesive is provided. The polyurethane adhesive has an A-side that includes an isocyanate and a non-reactive plasticizer, and a B-side that includes an aliphatic polyester polyol, a non-polyester polyol, and a urethane catalyst. The A-side and the B-side are reacted at a volume ratio of 1:1 and formulated at an NCO/OH index within the range of 0.90 to 1.10. The polyurethane adhesive is solvent-free and is particularly suitable for adhering a polymeric membrane to a substrate.

Disclosed is a polyol composition comprising: (a) at least one monomeric polyol comprising three or more hydroxyl groups; (b) at least one higher polyol comprising three or more hydroxyl groups; and (c) at least one polyhydroxylated aromatic compound; wherein the at least one higher polyol comprises residues of either or both of the at least one monomeric polyol and the polyhydroxylated aromatic compound linked by one or more carbonate groups, oxygen ether groups, or a combination thereof, and wherein the polyol composition has a viscosity of less than 5000 cps at 150 degrees Fahrenheit. The at least one monomeric polyol and at least one higher polyol may have any structures affording polyol compositions and polyurethane compositions having the requisite physical characteristics in terms of polyol composition viscosity and polyurethane heat resistance, strength and flexural modulus. The polyol compositions are adapted to provide structurally robust, temperature resistant polyurethanes, but are of sufficiently low viscosity to permit the use of currently available pumping and mixing equipment. The resultant polyurethane compositions may exhibit heat distortion temperatures in excess of 110 degrees centigrade, high strength and essentially no loss of material properties in prolonged humidity tests at 70 degrees centigrade, lower peak exotherms, typically less than 250 degrees Fahrenheit during in-mold curing/polymerization. Articles prepared from polyurethanes incorporating such polyol compositions as reactants exhibit flexural strengths in excess of 10,000 psi and flexural moduli in excess of 400,000 psi, and exhibit outstanding green strength.

A polyester polyol of formula produced by a first polycondensation (a) of a sugar alcohol Z in C3 to C8 and two diacids Y and Y′ which are the same or different in C4 to C36, and a second polycondensation (b) of the product produced in (a) with two diols X and X′ which are the same or different in C2 to C12, the polymer including such a polyester polyol. Also, a method for producing the polyester polyols and the use thereof in foams, adhesives, coatings or elastomers of polyurethane or polyisocyanurate.

A polyurethane or polyurethane-urea composition with reduced cold hardening being the reaction product of: a) at least one block copolymer of A-B-A type with an average number molecular weight of 1000 to 5000 g/mol, and being the reaction product of a poly(alkylene oxide) diol and a cyclic lactone or ether, the poly(alkylene oxide) diol being present in the range 30-70 wt % of the block copolymer and the cyclic lactone or ether is present in the range 30-70 wt, and b) at least one diisocyanate, and associated uses of the same.