Abstract: A compressor wheel for a compressor of a turbocharger has a hub and a multiplicity of blades on the hub. In intermediate spaces of the multiplicity of blades, a channel is in each case formed between a suction side and a pressure side. The channel guides fluid that flows in axially in relation to a rotation axis radially or radially-axially outward. The hub in relation to the rotation axis is contoured such that the hub has a rotationally symmetrical portion and a non-rotationally symmetrical portion. On the non-rotationally symmetrical portion, a transition between the hub and each of the blades is embodied with a radiused connection and facing the suction side has a region of modified thickness. A region formed by control rays is generated in at least one channel between the suction side and the pressure side on the hub. A method produces the compressor wheel.

Abstract: The present invention relates to melamine-formaldehyde resins comprising a guanamine, to processes for their preparation and to their use for the production of melamine resin films and edgings.

Abstract: The present invention relates to a triazine/formaldehyde resin which contains a compound of the general formula I ##STR1## wherein R.sup.1 and R.sup.2 are defined as stated in claim 1, a process for its preparation and its use as a curing agent in surface coating systems.

Abstract: A 3-component lacquer composed of A) compounds containing at least two R.sup.1 R.sup.2 C.dbd.CR.sup.3 --X groups (I) wherein R.sup.1 denotes hydrogen or a hydrocarbon radical having 1 to 10 carbon atoms, R.sup.2 and R.sup.3 are individually hydrogen, a hydrocarbon radical having 1 to 10 carbon atoms, an ester group containing the radical R.sup.4 of a monohydric alcohol having up to 12 carbon atoms, --CN, --NO.sub.2 or a --CO--NHR.sup.1 or --CO--R.sup.1 group, X is --CO-- which is attached to a further R.sup.1 R.sup.2 C.dbd.CR.sup.

Abstract: A reaction product of (A) compounds containing at least two R.sup.1 R.sup.2; C.dbd.CR.sup.3 --X groups (I) with (B) compounds which contain(a) at least two active H atoms or(b) at least two groups containing active H atoms of the type --AH-- (II) or(c) at least one active H atom and at least one group of the type (III),or which form the corresponding amount of this group (II), in which, the formula (I),X denotes --CO-- which is attached to a further R.sup.1 R.sup.2 C.dbd.CR.sup.3 group either directly or via the radical of a polyhydric alcohol or of an amine,R.sup.1 denotes hydrogen or a hydrocarbon radical having 1 to 10, preferably 1 to 4, carbon atoms, such as alkyl, phenyl, benzyl or naphthyl,R.sup.2 denotes hydrogen, a hydrocarbon radical having 1 to 10, preferably 1 to 4, carbon atoms, such as alkyl, phenyl, benzyl or naphthyl, an ester group containing the radical R.sup.4 of a monohydric alcohol having up to 12 carbon atoms, --CN, --NO.sub.2 or a CO--NHR.sup.1 or CO--R.sup.1 group, andR.sup.

Abstract: Modified aminoplast resin comprising:(a) 60 to 99.5% by weight of an aminoplast precondensate which has been etherified with a lower alkanol to an extent not exceeding 10% and(b) 0.5 to 40% by weight of a modifying agent which comprises a mixture of (i) a water-soluble polyester prepared from carboxylic acids with at least one carboxyl and dihydric or polyhydric alcohols, and (ii) sufficient free diol or polyol whereby the mixture has a ratio of the sum of free and esterified hydroxyls of 0.8 to 4.5 moles for each mole of the sum of free and esterified carboxyls which resins are useful in impregnating webs for producing laminates and panels of wood-based materials.

Abstract: Glass fibers for reinforcing thermoplastic resins are sized with an aqueous dispersion comprising a polyurethane-ionomer as a film-forming agent and a bonding agent comprising an epoxy-containing alkoxysilane. Advantageously the polyurethane is a very small particle ionomer and the bonding agent is selected from the group consisting of(a) an epoxyalkyl alkoxysilane+an aminoalkyl alkoxysilane,(b) an epoxyalkyl alkoxysilane+a low-molecular weight aliphatic primary or secondary mono-amine,(c) an aminoalkyl alkoxysilane+a low-molecular weight monoepoxide, and(d) an epoxyalkyl alkoxysilane.

Abstract: An improved process for the preparation of methylolaminotriazines etherified with alkanols and having per mol of the aminotriazine, an analytically determined average of 0.6 n to 2 n preferably 0.7 to 2 n methylol groups, which are etherified to the extent of 30 to 60%, n being the number of amino groups in the aminotriazine, wherein an aminotriazine is warmed to 80.degree. to 130.degree. C. with 0.7 n to 3 n mols of formaldehyde, 2 n to 10 n mols alkanol or a mixture of alkanols having 1 to 8 carbon atoms, the carbon chain of which, if having more than 2 carbon atoms, can also be interrupted by an oxygen atom, and 0 to 5 n mols of water, per mol of the aminotriazine, for 0.2 to 20 minutes, under elevated pressure, wherein the improvement comprises said aminotriazine being first heated to a temperature of 60.degree.-90.degree. C.

Abstract: This invention relates to a process for the manufacture of methanol-etherified methylolmelamines which are largely monomeric containing more than 5 mols of formaldehyde and more than 4 mols of methyl-etherified methylol groups, per mol of melamine, and having a viscosity of less than 20 pascal-seconds at 25.degree. C. and a solids content of at least 95%, comprising (a) methylolating melamine with formaldehyde at a molar melamine:formaldehyde ratio of 1:6.5 to 1:8 for 11/2 to 5 hours at 50.degree. C. to 85.degree. C., with the formaldehyde source being an aqueous solution of formalin containing 30 to 50% by weight of formaldehyde and having a pH of 6.7 to 7.3, and (b) etherifying the resulting suspension of methylolmelamine with 15 to 30 mols of methanol per mol of melamine at temperatures of 30.degree. C. to 60.degree. C. in the presence of a strong acid.

Abstract: A process for the preparation of a substantially monomeric methylolmelamine etherified by methanol which contains per mol of melamine, more than 5 mols of formaldehyde and more than 4 mols of methyl-etherified methylol groups which has a viscosity of less than 10 Pa.s at 25.degree. C. at a solids content of at least 95%, said process comprising reacting melamine and formaldehyde in a molar ratio of from 1 : 6.2 to 1 : 8, at a temperature of from 40 to 60.degree. C., in the presence of a basic catalyst in a reaction mixture which contains from 10 to 40% by weight of water and from 40 to 20% by weight of methanol thereby producing a suspension of methylolmelamine, and then etherifying the methylol melamine in the presence of from 15 to 30 mols of methanol per mol of melamine, at a temperature of from 25 to 50.degree. C., in the presence of a strong acid.

Abstract: An electromagnetic or magnetodynamic transducer-sound pickup comprises a phonograph needle which is connected to either a permanent magnet or a soft iron magnetic member and which is mounted for oscillation in front of, or between a plurality of parallel spaced apart pole rods which are provided with energizing coils. The pole rods are connected at one end to a pole plate. Mechanical oscillations of the magnetic system are suppressed in the zone where the pole plate is connected to the pole rods or in the zone where the pole plate is connected to the permanent magnet by an envelope of plastic which is injection molded around the plate and the rods.

Abstract: Aminoplast preparation is greatly speeded by condensing an aminotriazine such as melamine with formaldehyde and etherifying alkanol under superatmospheric pressure and at a temperature between about 80.degree. and about 130.degree. C.

Abstract: Low-viscosity high-solids-content melamine-formaldehyde condensates having high reactivity, low content of free formaldehyde and good compatibility, are prepared by effecting condensation in an alcohol having up to 3 carbons, then concentrating the condensate and heating the concentrate in a higher alcohol having from 3 to 18 carbons and again concentrating. The final product cures on heating to a hard glossy film and can be added to other uncured resins to improve the hardness of their films.

Abstract: A process for preparing a substituted urea of the formula ##EQU1## wherein R.sup.1 taken separately is alkyl having 1 to 8 carbon atoms, alkenyl having 3 to 8 carbon atoms, cycloalkyl having 5 to 6 carbon atoms or aryl having 6 to 12 carbon atoms; R.sup.2 taken separately is hydrogen, alkyl having 1 to 18 carbon atoms, alkenyl having 2 to 18 carbon atoms, aralkyl having 7 to 14 carbon atoms or aryl having 6 to 12 carbon atoms or R.sup.1 and R.sup.2 taken together form a polymethylene bridge having 2 to 10 carbon atoms; R is a tetravalent alkane radical having 1 to 6 carbon atoms, a tetravalent alkene radical having 3 to 8 carbon atoms, a tetravalent cycloalkane radical having 5 to 6 carbon atoms, a tetravalent aralkane radical having 7 to 14 carbon atoms or a tetravalent aryl radical having 6 to 12 carbon atoms and X.sup.1, X.sup.2 and X.sup.

Abstract: High quality coatings and the like are formed from dispersions in a reactive liquid of finely divided solid isocyanated polyester resin having isocyanate groups part of which are masked but become unmasked upon heating and then react with the liquid. The liquid is essentially one or more highly etherified methylolated aminotriazine in which some of etherifying is with alkoxyethyl groups that provide relatively low viscosity and good reactivity.