This disclosure generally provides compositions with improved flammability resistance and processes for preparing these compositions, wherein the resin composition comprising: (a) a polyfunctional isocyanate; (b) an isocyanate reactive composition comprising (b1) a polyfunctional polyol and a catalyst composition; and/or (b2) a polyfunctional amine; and (c) a benzoxazine component solved in the resin composition.

Disclosed herein is a process for the production of poly(meth)acrylimide materials. Therein, a granulated copolymer of (meth)acrylic acid and (meth)acrylonitrile is prefoamed and imidated by thermal treatment in a single step to provide poly(meth)acrylimide particles.

What are described are compositions for production of polyurethane foam, comprising at least an isocyanate component, a polyol component, optionally a catalyst that catalyzes the formation of a urethane or isocyanurate bond, optionally blowing agent, wherein the composition comprises block copolymers based on OH- or amino-functionalized polyolefins and polyesters that act as foam stabilizer.

A polyol component P) contains at least two different polyether polyols A) and C), and at least one polyether ester polyol D). A process can be used for producing rigid polyurethane foams using the polyol component P), and the rigid polyurethane foams produced therefrom are useful.

A process for producing rigid PUR/PIR foams comprising A1 an isocyanate-reactive component, A2 a flame retardant, A3 a blowing agent, A4 a catalyst, A5 optionally auxiliaries and additives, and B an organic polyisocyanate component. Component A1 comprises a triurethane triol 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.

The present invention provides fire-retarded rigid polyurethane foam comprising the reaction product of polyol and isocyanate foam forming components and a dialkyl phosphorus-containing compound, namely a reactive mono-hydroxyl-functional dialkyl phosphinates, as flame retardant, serving as highly efficient reactive flame retardant in said rigid polyurethane foam.

A fiber-reinforced resin composite having high peeling strength between a fiber-reinforced resin and a resin foam. The fiber-reinforced resin composite (10) is a fiber-reinforced resin composite (10) including a skin (11) and a resin foam (12), the resin foam including a foamed resin (16), the skin including a fiber sheet (14), a thermoplastic matrix resin (15), and the foamed resin (16) that is continuous from the resin foam and is impregnated into the skin.

A method for producing an expanded rigid foam with sealed pores includes at least the following steps: a) a mixture is prepared containing at least: an anionic polymer suited for ionotropic gelation; a foaming agent; a source of multivalent cations, said multivalent cations not being released in the mixture a); and a solvent; b) the mixture is stirred so as to obtain a foam; c) a compound capable of releasing protons in a sufficient amount to release said multivalent cations is added to the foam such that the anionic polymer gels ionotropically; d) the foam is dried. A foam is obtained in this manner and an object (for example a package, a heat-insulating or flame-retardant material) is made from this foam.

A polyol component P) contains at least three different polyether polyols A) to C). A method produces rigid polyurethane foams using the polyol component P), and the rigid polyurethane foams produced therefrom are useful.

A rigid PU or PU-PIR foam comprising a reaction product of water, a catalyst, a foam-stabilizing surfactant, a polyisocyanate, a blowing agent and a blend comprising: (a) 90 to 99 wt.% of an aromatic polyester polyol having a hydroxyl number within the range of 150 to 400 mg KOH/g; and (b) 1 to 10 wt.% of a fatty acid derivative selected from the group consisting of C.sub.8 to C.sub.18 fatty acid esters and C.sub.8 to C.sub.18 fatty acid amides.