The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a precipitation-resistant metal-based catalyst used alone or in combination with an amine catalyst.

Disclosed are HCFO-containing isocyanate-reactive compositions, polyurethane foam-forming compositions containing such isocyanate-reactive compositions, rigid polyurethane foams made using such polyurethane foam-forming compositions, and methods for producing such foams, including use of such foams as insulation in the construction of refrigerated storage devices. The isocyanate-reactive composition can exhibit a long shelf life, be shelf-stable, and produce a foam with good thermal insulation properties.

Provided is a prepreg containing a urethane (meth)acrylate (A), an ethylenically unsaturated monomer (B), a polymerization initiator (C), and reinforcement fibers (D), characterized in that the urethane (meth)acrylate (A) is a reaction product of a polyisocyanate (a1) and a polyol (a2) having an ethylenically unsaturated group and an aromatic skeleton, and/or a reaction product of a polyisocyanate (a1), a polyol (a3) not having an ethylenically unsaturated group but having an aromatic skeleton, and a hydroxyalkyl (meth)acrylate (a4), and that the ethylenically unsaturated monomer (B) has a molecular weight of 320 or more and a weight reduction rate (%) of less than 2 when heated under atmospheric pressure at 150° C. for 3 minutes. The prepreg has excellent moldability and enables to produce a molded article having excellent physical properties such as flexural strength and interlaminar shear strength, and therefore the prepreg can be suitably used in automobile components and the like.

A binder has at least one isocyanate and at least one biopolymer mixed with water. The biopolymer may be a biopolymer nanoparticle or cooked and chemically modified starch. Optionally, the binder may also include urea. The biopolymer and water are mixed, and the isocyanate is added to the mixture. The binder may have a viscosity that is suitable for being sprayed on a substrate to make a composite material, for example a viscosity of 700 cP or less or 500 cP or less at 40° C. The substrate may be wood, another lignocellulosic material, or synthetic or natural fibers. In particular examples, the binder is used to make no added formaldehyde wood composites including particle board and fiberboard. Alternatively, the binder may have a higher viscosity and be used to make plywood.

The present invention aims to provide an epoxy resin composition for a fiber-reinforced composite material that maintains low viscosity during injection into reinforcing fibers to realize good impregnating and also has high toughness and high heat resistance and also aims to provide a fiber-reinforced composite material produced therefrom. Also provided is a molding method for a fiber-reinforced composite material including at least a reinforcing fiber [A] and a cured product of an epoxy resin composition [B], wherein the epoxy resin composition [B] includes the components [a], [b], and [c] specified below, and the epoxy resin composition [B] is cured in such a manner that the absorbance ratio Da/(Da+Db) is in the range of 0.4 to 1 in producing the fiber-reinforced composite material: [a] an epoxy resin having at least two oxirane groups in the molecule, [b] an epoxy resin curing agent having at least two isocyanate groups in the molecule, and [c] a catalyst.

HCFO-containing isocyanate-reactive compositions, foam-forming compositions containing such isocyanate-reactive compositions, rigid PUR-PIR foams made using such foam-forming compositions, and methods for producing such foams, including use of such foams as insulation in discontinuous foam panel applications. The isocyanate-reactive composition includes a polyol blend, a blowing agent composition, and a tertiary amine catalyst. The polyol blend includes: (1) an aromatic polyester polyol having a functionality of 1.5 to less than 2.5 and an OH number of 150 to 360 mg KOH/g; (2) an aromatic polyester polyol having a functionality of at least 2.5 and an OH number greater than 360 mg KOH/g, which is present in an amount of at least 10% by weight, based on the total weight of the aromatic polyester polyol in the polyol blend; and (3) an amine-initiated polyether polyol having an OH number of at least 500 mg KOH/g and a functionality of 2.5 to 4. The blowing agent composition includes a hydrochlorofluoroolefin and a carbon dioxide generating chemical blowing agent.

A composition for application to a substrate is provided. The composition comprises a base component and an activator component. The base component comprises hydroxyl functional prepolymers and the activator comprises isocyanate prepolymers. The composition further comprises an amount of carbon fibre. The hydroxyl functional prepolymers are formulated to polymerise with the isocyanate prepolymers to form a polymer containing carbon fibre.

An adhesive composition is described comprising unpolymerized cyclic olefin, a ring opening metathesis polymerization (ROMP) catalyst or precatalyst thereof, and one or more adhesion promoter polymers. In one embodiment, the adhesion promoter is a polyolefin comprising maleic anhydride or silicon-containing moieties. In one embodiment, a combination of at least one polymeric polyisocyanate and at least one polyolefin comprising maleic anhydride or silicon-containing moieties provides a synergistic improvement. In another embodiment, a polymeric polyisocyanate adhesion promoter comprising oxygen atoms in the backbone has been found useful for bonding substrates such as polyamide, polyether ether ketone, or polyether imide. Also described are methods of bonding a substrate and articles, such as an electric battery cold plate assembly.

To provide a polyether polyol having a high degree of freedom in the design of a polyurethane foam, and capable of providing a polyol system solution excellent in storage stability. A polyether polyol having a polyoxyalkylene chain consisting of oxyalkylene units, and having a degree of unsaturation of at most 0.020 meq/g, a hydroxy value of from 1 to 80 mgKOH/g, a content of oxyethylene units of from 0 to 50 mass %, and a content of ultra-high molecular weight components which have molecular weights of from 12 to 46 times the number average molecular weight of at most 1,000 mass ppm. The number average molecular weight is a molecular weight as calculated as polystyrene measured by gel permeation chromatography (GPC) method, and the content of ultra-high molecular weight components is a value measured by high performance liquid chromatography (HPLC) method using a charged aerosol detector (CAD).

A polyurethane foam may include an isocyanate polymer component and a polyol component. The polyol component may include a polyol having a molecular weight of at least about 500 kg/mol and not greater than about 6000 kg/mol. The polyurethane foam may have an elongation of at least about 500%. The polyurethane foam may further have a density of at least about 250 g/L and a tensile strength of not greater than about 1000 kPa.