An electrochemical oxygen sensor includes a sensing surface having a working electrode and a reference electrode, a hydrophilic layer formed from an oxygen diffusion-limiting layer emulsion overlaying the working electrode and a hydrophobic membrane formed from a hydrophobic solution disposed over the hydrophilic layer. The hydrophilic layer contains an epoxy network and a hydrophilic polymer. The hydrophobic layer contains an acetate copolymer and a cross-linking agent that reacts with the liquid epoxy resin in the hydrophilic layer forming the epoxy network where the hydrophobic member is water vapor and oxygen permeable.

The invention relates to a dispersion comprising one or more protic solvents as dispersion medium and also, as base components dispersed therein, one or more matrix polymers, one or more epoxides, at least one kind of a modified compound of the polyamine adduct type which is insoluble in the epoxides, where the at least one modified polyamine adduct is in dispersion in particulate form, with 90% of the particles having a particle size in the range from 0.1 to 10 μm as determined by laser diffractometry.

A curing agent and method for producing the same are provided, the method includes: esterification reaction: reacting a polyhydric alcohol with a polybasic acid anhydride to obtain an ester-based emulsifier (A); chain extension reaction: reacting an ester-based emulsifier (A) with a bifunctional epoxy resin to obtain a polymer intermediate (B); and reacting the polymer intermediate (B) with a polyamine compound to obtain a curing agent (C).

A curing agent composition and a curing agent coating formula thereof are provided. The curing agent composition includes 5 to 25 wt % of an ester group-containing amine end group adduct, 2 to 25 wt % of a C8-C22 hydrophobic saturated or unsaturated fatty amine, 2 to 25 wt % of a polyamine compound, 2 to 20 wt % of a silane compound, and 10 to 60 wt % of an ether solvent.

Disclosed herein are compositions including (a) a first component comprising (1) an epoxy-adduct that is the reaction product of reactants comprising a first epoxy compound, a polyol, and an anhydride and/or a diacid and (2) a second epoxy compound; (b) rubber particles having a core/shell structure and/or graphenic carbon particles; and (c) a second component that chemically reacts with the first component at ambient or slightly thermal conditions. Also disclosed herein are compositions including (a) an epoxy-capped flexibilizer; (b) a heat-activated latent curing agent; and optionally (c) rubber particles having a core/shell structure and/or graphenic carbon particles; (d) an epoxy/CTBN adduct; and/or (e) an epoxy/dimer acid adduct. The heat-activated latent curing agent may include at least one reaction product of reactants including an epoxy compound and an amine and/or an alkaloid.

Embodiments provide a self-healing coating formulation comprised of a one component waterborne epoxy-amine adduct resin system and a microencapsulated healing agent. The self-healing coating formulation hardens to a protective material upon application to a substrate. Components in the protective material and microencapsulated healing agent are uniquely synergistic with each other such that, upon degradation of the protective material, microcapsule rupture causes release of the healing agent, whereby components of the healing agent react with components of the protective material to increase adhesion maintenance and corrosion resistance of the protective coating.

An adduct AD obtained from the reaction of at least one novolak glycidyl ether containing an average of 2.5 to 4 epoxy groups per molecule with an amine mixture including bis(6-aminohexyl)amine and at least one amine A1 other than bis(6-aminohexyl)amine that has at least one primary amino group. Preferably, the amine mixture is a technical grade quality of bis(6-aminohexyl)amine that contains 25% to 82% by weight of bis(6-aminohexyl)amine. The adduct AD is preparable in a simple manner and without the use of solvents, and enables low-odor, low-toxicity and low-viscosity hardeners that can be processed and stored even under cold conditions. Epoxy resin compositions cured therewith very rapidly build up high binding forces and high strengths under ambient outdoor temperatures, even on substrates that are difficult to bond.

A curing agent for epoxy resins, containing at least one amine adduct of formula (I) which can be obtained as an addition product of a mixture of a primary diamine, a monoalkylated other diamine and a polyepoxide. The curing agent makes it possible to produce low-odor, low-emission epoxy resin products, in particular coatings, which have a surprisingly low viscosity, a high curing rate, a high final hardness, and a surprisingly appealing surface.

The invention relates to a composition that is liquid at room temperature, can be fixed by radiation and cured by heat, comprising the following components: (A) an at least bifunctional epoxy-containing compound; (B) an at least bifunctional thiol; (C) a radiation-curable compound; (D) a photoinitiator; (E) a stabilizer blend that contains at least one sulfonyl isocyanate and at least one acid; and (F) a nitrogen compound as an accelerator. The compositions are processable at room temperature over a period of at least 24 h and can be completely cured even at low temperatures.

The present invention provides thermosetting resin pre-impregnated or infused fiber materials or prepregs comprising a fiber material of a heat resistant fiber, such as a continuous fiber material or a discontinuous chopped fiber mat, infused with a thermosetting resin mixture comprising (i) at least one liquid epoxy resin; (ii) at least one epoxy novolac resin, (iii) dicyandiamide and (iv) and an adduct of a cycloaliphatic amine and a liquid epoxy resin, wherein the dicyandiamide is dissolved in the adduct of a cycloaliphatic amine and a liquid epoxy resin. The prepreg or fiber material has a shelf life of at least 30 days at ambient temperature and pressure before its Initial Tg (DSC) rises above 40 C.