Abstract: Glycidylated mono(alkyl aryl)phenols (styrenated phenols) or mixtures thereof are suitable for use as reactive diluents and co-reactants in the production of epoxy resins and have the structure of the general formula I shown hereinbelow wherein R1 and R2 independently of one another denote —H, C1-3-alkyl, C1-3-oxalkyl and glycidyl, but R1 and R2 are not simultaneously glycidyl, R3 is an optionally substituted styryl of the formula R4 is a hydrogen residue or methyl, and R5 and R6 are in each case a hydrogen residue, C1-3-alkyl, C1-2-oxalkyl.

Abstract: A curing agent for epoxy resins comprises: a) a reaction product of at least one polyalkylene polyether monoamine and/or polyamine with a polyepoxide and optionally, a monoepoxide to obtain an epoxide group-containing precursor, the precursor further reacted with a primary monoamine and/or a primary or secondary polyamine in at least a 10% molar excess relative to the epoxide groups of the precursor, the reaction product being substantially free of non-reacted amines; b) an amine-terminated adduct of an epoxy resin and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines; and c) an amine-terminated adduct of an epoxide group-containing reactive thinning agent and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines, wherein the epoxy resin of component b) and epoxide group-containing reactive thinning agent of c) are added to the epoxide group-containing precursor of component a) before the reaction

Abstract: A curing agent for epoxy resins comprises: a) a reaction product of at least one polyalkylene polyether monoamine and/or polyamine with a polyepoxide and optionally, a monoepoxide to obtain an epoxide group-containing precursor, the precursor further reacted with a primary monoamine and/or a primary or secondary polyamine in at least a 10% molar excess relative to the epoxide groups of the precursor, the reaction product being substantially free of non-reacted amines; b) an amine-terminated adduct of an epoxy resin and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines; and c) an amine-terminated adduct of an epoxide group-containing reactive thinning agent and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines, and up to 50 mol % relative to the amino groups of a reactive thinning agent containing one or more epoxide groups per molecule.

Abstract: Novel cold-curing mixtures comprising epoxide compounds, curing agents, additives and optionally further auxiliary and filler materials, which have low irritant potential, which are free of solvents and are self-levelling and which, in the cured state, are colorfast and have a surface which, in terms of optical and tactile properties, is faultless.

Abstract: A curing agent for epoxy resin comprises: a) a reaction product of at least one polyalkylene polyether monoamine and/or polyamine with a polyepoxide and, optionally, a monoepoxide to obtain an epoxide group-containing precursor, the precursor further reacted with a primary monoamine and/or a primary or secondary polyamine in at least a 10% molar excess relative to the epoxide groups of the precursor, the reaction product being substantially free of non-reacted amines; b) an amine-terminated adduct of an epoxy resin and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines; and c) an amine-terminated adduct of an epoxide group-containing reactive thinning agent and a primary monoamine and/or a primary or secondary polyamine being substantially free of non-reacted amines.

Abstract: The invention relates to curing agents emulsifiable in water, which comprise the following components:

Abstract: The invention relates to curing agents emulsifiable in water, which comprise the following components:

Abstract: Novel cold-curing mixtures comprising epoxide compounds, curing agents, additives and optionally further auxiliary and filler materials, which have low irritant potential, which are free of solvents and are self-levelling and which, in the cured state, are colorfast and have a surface which, in terms of optical and tactile properties, is faultless.

Abstract: To provide a reliable, yet resilient, seat for a cutter blade or knife (13) in a rotary milling body (11), the milling body is formed with a bore (21) which intersects the inner wall (19) of a recess (12) in the circumference of the milling body (11). A roll pin is inserted in the bore, retained therein, but projecting over the plane of the wall surface (19). The knife (13) is formed with a longitudinal groove (27), having opposite flat angled side walls (60), which fit around the projecting surface of the roll pin. A holding element (15), fitted into the recess, bears against knife and resiliently clamps it against the roll pin. Preferably, the holding element (15) and the knife (13) are formed with an interengaging projection (41) and recess (42) arrangement.

Abstract: An epoxy resin system comprising a) at least one nitrogen containing epoxy compound having at least two epoxy groups, b) at least one phosphorus compound with at least one epoxy group, c) at least one metallic complex compound as curing agent and d) optionally filler and additive substances free of halogenated compounds and having a low degree of inflammability.

Abstract: The valve device for exhaust gas feedback in an internal combustion engine comprises a controlled valve (1) whose valve plate (1a) cooperates with a valve seat (2) in a valve housing (7b). The exhaust gas inlet of the valve housing is connected via an exhaust gas feedback pipe (7) to the exhaust gas side of the internal combustion engine and the exhaust gas outlet is connected through a connecting pipe (16) to the induction side of the internal combustion engine. The valve housing is formed by an end section (7b) of the exhaust gas feedback pipe (7) itself and the valve seat (2) is formed by a constriction (8) formed in the end section. The pipe part (9) of the end section (7b) connected to the constriction (8) carries the regulating actuator housing (3). The pipe part (9) is provided at the side with an opening (14) forming the exhaust gas outlet and the connecting pipe (16) is brazed to the pipe part (9) in the region of this opening (14).

Abstract: A process for the preparation of 2-oxo-1, 3-dioxolanes comprises reacting an epoxy compound having at least one functional epoxy group in the optional presence of an inert solvent with carbon dioxide at 60.degree. C. to 200.degree. C. at normal pressure in the presence of a quaternary phosphonium compound as catalyst and novel quaternary phosphonium compounds useful as catalysts in the said process.

Abstract: A hardening agent for epoxy compounds prepared by reacting A) at least one member of the group consisting of polyalkyleneetherdiols and polyalkyleneetherpolyols with B) at least one polyisocyanate with a molar ratio of hydroxy groups to isocyanate group of 1:1.8 to 3, reacting the resulting product with C) an amine having at least one free primary or secondary amino group and at least one protected primary amino group with a molar ratio of isocyanate to amino groups of 1:1 to 2 and subjecting the latter product to hydrolysis useful for preparation of flexible hardened products with excellent mechanical properties.

Abstract: A process for the preparation of at least one member of the group consisting of monoglycidyl and polyglycidyl compounds comprising reacting a member of the group consisting of mono- and polyvalent phenols, aromatic amines and aromatic carboxylic acids with an epihalohydrin substantially free of halogenated hydrocarbons.

Abstract: Novel hardener compositions for epoxy resins comprising (a) 65 to 95% by weight of an adduct containing free amino groups of 35 to 94% by weight of at least one member of the group consisting of polyamines, polyaminoimidazolines and polyaminoamides and 5 to 30% by weight of at least one glycidyl compound, based on the total hardener composition weight, (b) 0.1 to 5% by weight at least one aliphatic or aromatic carboxylic acid and (c) 0.9 to 30% by weight of a phenol-modified aromatic hydrocarbon resin with a hydroxyl content of 0.9 to 6% and their preparation, water-emulsifable epoxy compositions containing said hardener compositions, aqueous emulsions of said epoxy resins, water compositions containing said aqueous epoxy emulsions and their uses.

Abstract: Storage stable, heat curable mixtures obtained from epoxy resins as a binder system containing latent hardening agents as well as fillers and additive materials which have outstanding mechanical and electrical properties and which are obtained as epoxy resin components of an adduct of a high molecular solid epoxy resin and 4,4'-diaminodiarylalkane in a molecular ratio of 1:0.01 to 0.05. The preferred economical curing agent is a phenol formaldehyde condensation product.