A polyol pre-mix composition includes a blowing agent having a halogenated hydroolefin, a polyol, a catalyst composition, and an antioxidant. The antioxidant may be, for example, a benzene diol or a benzene triol or other polyhydroxy-substituted aromatic compound, which is optionally substituted with one or more substituents such as alkyl groups. A two-part system for producing a thermosetting foam blend includes (a) a polyisocyanate and, optionally, one or more isocyanate compatible raw materials; and (b) the polyol pre-mix composition. A method for producing a thermosetting foam blend includes combining: (a) a polyisocyanate; and (b) the polyol pre-mix composition.

The present invention relates to imidazole and/or its derivative as polyurethane or polyisocyanurate foam catalyst in the presence of Low Global Warming Potential (GWP) halogenated olefinic blowing agents, such as the hydrochlorofluoroolefin (HCFO) HCFO-1233zd. More particularly, the present invention relates to catalyst compositions comprising imidazole and/or its derivative. The present invention further relates to the stable pre-blend formulations and resulting polyurethane or polyisocyanurate foams. A method for stabilizing thermosetting foam blends comprises combining: (a) a polyisocyanate and, optionally, isocyanate compatible raw materials; and (b) a polyol pre-mix composition comprising a halogenated olefinic blowing agent, a polyol, a surfactant, and a catalyst, wherein the catalyst comprises substituted imidazole having C2 or greater substitutions at the N1 nitrogen and/or its derivative. The resultant polyurethane or polyisocyanurate foams have uniform cell structure with little or no foam collapse.

The present invention pertains to antimicrobial compositions comprising inter alia at least one alkenyl- and/or alkynyl-substituted polysiloxane, at least one polysiloxane comprising silicon-bonded hydrogen atoms, and at least one hydrosilylation catalyst, as well as antimicrobial silicone gels, wound dressings, and methods of preparing the above.

The present invention relates to a gas separation membrane for separating a target gas species from a mixture of gas species, the membrane comprising: (i) a porous substrate having a first and second surface region between which the mixture of gas species will flow; (ii) a sealing polymer layer of different composition to the porous substrate that (a) forms a continuous coating across the second surface region of the substrate, and (b) is permeable to the mixture of gas species; and (iii) a selective polymer layer in the form of a cross linked macromolecular film that (a) is located on and covalently coupled to the sealing polymer layer, and (b) has a higher permeability to the target gas species relative to other gas species present in the mixture of gas species that is to be subjected to separation.

The use of an amidine of formula (I) and/or a conversion product thereof as a catalyst for the crosslinking of a composition based on silane group-containing polymers. The amidine of formula (I) and the conversion products thereof are essentially odourless at room temperature and non-volatile and accelerate the crosslinking of the composition very well without impairing the storage stability of the composition, and are very compatible in the composition. As a result, the compositions do not have a tendency to separate, migrate or evaporate the catalyst.

The use of a catalyst of the formula (I) for the crosslinking of a curable composition. The catalyst of the formula (I) contains at least one aliphatic guanidine group. It is substantially odourless and nonvolatile at room temperature and accelerates the crosslinking of curable compositions very efficiently, without impairing the storage stability thereof. It is particularly suitable for compositions based on polymers containing silane groups, where it has very good compatibility, as a result of which such compositions do not have a tendency to separation or migration or evaporation of the catalyst.

Provided herein is a masterbatch including a grafted silicone polyether and a porous inorganic nanoparticle, bacteria repellant polymer composites including the same, and methods of preparation thereof.

A foamed material includes specific amounts of a polystyrene, an organophosphate ester, and a poly(phenylene ether) or a poly(phenylene ether)-polysiloxane block copolymer or a combination thereof. The material is foamed with a C.sub.3-C.sub.5 alkane blowing agent. The foamed material is useful as insulation in the construction of walls and ceilings.

The present invention aims to provide a curable resin composition capable of forming a film which, even when made thick, is less likely to crack at high temperature under a nitrogen atmosphere, a cured film formed using the curable resin composition, a stack including the cured film, an imaging device including the stack, an semiconductor device including the stack, a method for producing the stack, and a method for producing an element including a bonding electrode for use in production of the stack. Provided is a curable resin composition containing: a polyimide; and a silsesquioxane, the polyimide being contained in an amount of 0.5 parts by weight or more and 50 parts by weight or less relative to 100 parts by weight of the silsesquioxane.

The present invention aims to provide a curable resin composition that can planarize bonding surfaces and connect elements without leaving surface voids even when the elements have irregularities on the surface, thus imparting high bonding reliability between the elements, a cured film formed using the curable resin composition, a stack including the cured film, an imaging device including the stack, an semiconductor device including the stack, a method for producing the stack, and a method for producing an element including a bonding electrode for use in production of the stack. Provided is a curable resin composition containing: an organosilicon compound; and a solvent, the curable resin composition having a viscosity at 25 C. of 2,000 cP or less, the solvent being contained in an amount of 50% by weight or less in the curable resin composition, the curable resin composition having an adhesion of a score of 0 to 2 as measured by a cross-cut method in conformity with JIS K5600-5-6 using a measurement sample obtained by spin-coating a silicon wafer with the composition, evaporating the solvent, and then heat curing at 300 C. for one hour to form a film.