Abstract: A process for producing a 3,3-dimethyl-2-alkoxyoxirane comprises oxidizing a 1-alkoxy-2-methylpropene with molecular oxygen in the liquid phase, at a temperature of 25.degree.-70.degree. C., optionally in the presence of an alkaline compound.

Abstract: The level of radioactivity in gypsum produced from phosphate rock can be reduced by adding to the slurry of acid and phosphate rock in the conventional process for producing phosphoric acid a combination of concentrated nitric acid or hydrochloric acid and an ammonium salt, especially ammonium nitrate or ammonium phosphate, before the precipitation of the calcium sulfate.

Abstract: A flow-promoting device in combination with a heated box tray open at the top in a reaction and degasification column in which a viscous or highly viscous liquid is flowing from an inlet end to an outlet end of the tray and in which a heating tube register is located to be completely covered by the liquid. The tube register includes a plurality of heating tubes spaced from each other, and the flow-promoting device has a bottom heating unit for the box tray positioned outside and along the bottom of the tray, a siphon plate mounted on the tray at a liquid inlet end of the tray and closely in front of the tube register, with the siphon plate having a bottom end extending to the underside of the tube register, and a weir positioned at the liquid outlet end of the box tray. The weir has a top edge extending at least to the topside of the tube register, and the spacing of the weir from the tube register is larger than the spacing of the siphon plate at the inlet end from the tube register.

Abstract: A process for producing a shelf-stable ethylene-.alpha.-olefin (diene) elastomer powder which comprises a release agent, comprising grinding crumbs or preliminarily comminuted particles of an ethylene-.alpha.-olefin (diene) elastomer having a green strength of 5-20 MPa and a Mooney viscosity ML (1+4) 100.degree. C. of 50-150, and, prior to, during or after the grinding step, adding 0.5-10 parts by weight per 100 parts by weight of the ethylene-.alpha.-olefin (diene) elastomer, of a release agent which is(a) polyethylene of a density of 0.910-0.975 g/cm.sup.3, a viscosity number of 50-330 cm.sup.3 /g and a melt index of 0.2-50 g/10 min, polypropylene of a density of 0.90-0.910 g/cm.sup.3, a viscosity number of 100-1000 cm.sup.3 /g and a melt index of 0.1-50 g/10 min, polybutene-1 of a density of 0.910-0.975 g/cm.sup.3, a viscosity number of 100-1000 cm.sup.3 /g and a melt index of 0.1-100 g/10 min, polyvinyl chloride of a viscosity number of 50-200, all having an average secondary particle size of 5-50 .mu.

Abstract: Cyclic imides of the formula: ##STR1## in which R represents a saturated or unsaturated, optionally alkyl- or alkenyl-substituted alkylene or cycloalkylene radical having 2-120 C-atoms and R' represents hydrogen or a substituent selected from the group consisting ofan alkyl radical having 1-20 C-atoms,an alkenyl radical having 3-5 C-atoms,an aralkyl radical having 7-12 C-atoms,--CH.sub.2 --CH.sub.2 --CN,--CH.sub.2 --CH.sub.2 --COO--alkyl,--CH.sub.2 --CH.sub.2 (CH.sub.3)--COO-alkylan acyl radical or--(CH.sub.2 --CH.sub.2 O).sub.n H, wherein n is 1-10are stabilizers for synthetic resins especially for polyolefins.

Abstract: Powdered coating compositions having good storage stability and particle size smaller than 0.25 mm, particularly 0.02 and 0.06 mm, based on polyesters which contain hydroxyl groups and melt between 40.degree.-120.degree. C., .epsilon.-caprolactam blocked isophorondiisocyanate adducts, and catalysts, if necessary, and customary additives, wherein isophoronediisocyanate adducts partially blocked with .epsilon.-caprolactam are used as curing agents.Methods for producing the above mentioned powdered coating compositions, wherein the polyesters containing hydroxyl groups are reacted in the melt or in solvents at temperatures of 0.degree.-150.degree. C., particularly 80.degree.-120.degree. C., with an isophorondiisocyanate adduct blocked with .epsilon.-caprolactam which contains 0.1 to 1 mole of free NCO-groups per mole of adduct and 0.4-1.1 NCO-equivalents separate to OH equivalent.

Abstract: A process for removing troublesome precipitates of condensable gases in a heat exchanger of a continuously operated low temperature installation in which gas to be cooled, such as air, which contains condensable gases at ambient temperature is passed from a warm end to a cold end of the exchanger through a storage material and over heat exchange surfaces--maintained at a temperature ranging from -165.degree. C. to -160.degree. C. at the cold end--and cold regenerator gas free of condensable gases is alternately passed from the cold end to the warm end over the storage material and heat exchanger surfaces to remove precipitates of the condensable gases therefrom in a cyclic operation, without total shut-down of the installation, involves the further step of introducing warm gas which is at a temperature of between 0.degree. C. and +110.degree. C.

Abstract: A process for the continuous separation of methanol and water from a feed mixture containing predominantly tetrahydrofuran admixed with water, methanol and small amounts of additional compounds, in a rectifying apparatus having at last two rectifying columns, of which two are operated at different pressures which involves feeding the raw material into a first column operated under lower pressure, and introducing the distillate from the column operated under a lower pressure to a second column operated under a higher pressure, while a product stream from the second column operated under a higher pressure is reintroduced into the first column operated under a lower pressure.

Abstract: The invention relates to a method of preventing smoldering decomposition of multiple-nutrient fertilizers containing ammonium nitrate at elevated temperatures by treatment of the granulated, dried and screened fertilizer with ammonia.

Abstract: A process of producing storage-stable urethane acryls which comprises:(A) forming a prepolymer by reacting one isocyanate group of a cycloaliphatic diisocyanate having two isocyanate groups of substantially different reactivity, with a single NCO reactive hydroxy group-containing acrylic compound which is additionally polymerizable;(B) reacting said prepolymer with a multifunctional polyol to thereby obtain a substantially NCO-free urethane acryl. Acryl urethanes produced can be used as hot melts or in mixtures with reactive diluents for coatings of plastics, metals, wood, pressboards, glass, leather, concrete, and the like.

Abstract: A method for producing a catalyst comprising phosphoric acid and a carrier, for the hydration of olefins with 2-3 carbon atoms to the corresponding alcohols, the method comprising:contacting a clay, containing essentially montmorillonite, contaminated by no more than 3% accompanying minerals and containing up to 0.5% by weight K.sub.2 O, or a mineral of the montmorillonite group, containing no potassium, but having the montmorillonite crystalline lattice, with an acid until it has an Al.sub.2 O.sub.3 content of 13-18% by weight and a surface area of 200-400 m.sup.2 /g;admixing the so-treated clay with 5-15% by weight, based on the total dry admixture, of one or more oxides of metals of Group VI of the Periodic System;adjusting the water content of the admixture to 20-35% by weight;pressing the admixture into a desired shape and calcining at 500.degree.-800.degree. C.;treating the so-formed carrier material with an acid until it has an Al.sub.2 O.sub.

Abstract: Herbicidal-substituted .alpha.-(trimethylcycloalkenyl)-N-alkylacetamides of the formula ##STR1## wherein R is a linear or branched alkyl or alkoxyalkyl radical with 1-6 carbon atoms or an allyl radical, optionally substituted with C.sub.1 -C.sub.4 alkylene groups, and X is a substituent from the group consisting of hydrogen, methyl, chlorine and bromine, in any combination, the free valences signify hydrogen and two of the methyl groups on the ring are attached to the same carbon atom, are useful pre- and post-emergent herbicides for weed control in crops.

Abstract: Urea derivatives containing isocyanatomethyl groups of 3(4), 8(9)-diisocyanatomethyltricyclo [5.2.1.0.sup.2,6 ] decane of the formulaOCN--H.sub.2 C--[R--CH.sub.2 --NH--CO--NH--CH.sub.2 ].sub.n --R--CH.sub.2 --NCO, in which R is ##STR1## and n=1-5.

Abstract: Terpolymers of maleic anhydride, dicyclopentadiene, and a vinylcyclohexene, preferably 1-vinylcyclohexene-3, are highly effective paper sizing materials.

Abstract: Isophoronediisocyanate adducts containing free NCO-groups and NCO-groups end blocked with .epsilon.-caprolactam and method for their production.

Abstract: Method for the preparation of compounds containing isocyanuric groups and blocked isocyanate groups from aliphatic and/or cycloaliphatic polyisocyanates; wherein the starting polyisocyanate is first transformed by a known method into a mixture containing an isocyanurate containing at least two free isocyanate groups; and this intermediate product is reacted with monofunctional acidic-hydrogen containing blocking agents; wherein the blocking agent is added in an amount such that one equivalent of agent is added for every equivalent of NCO-group equivalent.

Abstract: A process for producing a clay-containing catalyst for the hydration of olefins having 2-3 carbon atoms into alcohols, which comprises: (A) acid-treating a montmorillonite-containing clay which is contaminated by not more than 3% of quartz, feldspar or mica, and which may contain up to 0.5% of K.sub.2 O, until the clay has an Al.sub.2 O.sub.3 content of 13-18% by weight, thereby obtaining a surface area of 200-400 m.sup.2 /g; (B) molding the clay at a total water content of 20-35%; (C) calcining at 500.degree.-800.degree. C.; (D) acid-treating the molded and calcined clay to an Al.sub.2 O.sub.3 content of 1-5% by weight, thereby obtaining a surface area of 150-250 m.sup.2 /g; and (E) impregnating said material with phosphoric acid.

Abstract: A process for the production of a powdery, thermoplastic copolymer of ethylene and butene-(1) having a density of up to about 0.930 g/cm.sup.3 which comprises copolymerizing a mixture of ethylene and butene-(1) at 50.degree.-95.degree. C. and 10-100 bar in the presence of a catalyst which comprises (1) the reaction product of a chlorine and/or alkoxy-containing vanadyl (V) compound and an organic aluminum compound selected from the group consisting of ethyl aluminum dichloride, diethyl aluminum chloride, isobutyl aluminum dichloride, diisobutyl aluminum chloride, and mixtures thereof, and (2) an aluminum alkyl activating compound therefor, selected from the group consisting of aluminum trialkyls, alkyl aluminum sesquichloride, alkyl aluminum dichloride, and mixtures thereof, wherein the polymerization reaction is carried out in a solvent which comprises liquid butene-(1).

Abstract: A process for preparing coating powders based on polylaurolactam for the vitrification coating process beginning with polylaurolactam granulates obtained by polymerizing laurolactam under internal pressure in the presence of 2 to 10% by wt. of water and 0.3 to 0.7% by wt. of phosphoric acid at temperatures between 265.degree. and 300.degree. C., in the absence of chain stabilizers, and which have a relative viscosity of between 1.50 and 1.80. After precooling to temperatures between -50.degree. and 0.degree. C., the granulates are ground and then graded. Extraction with methanol or ethanol is carried out prior to grinding or grading. Pigments are added to the monomerous laurolactam or to the polylaurolactam in the molten state prior to granulation. The powders are especially well suited to manufacture colored powders by the dry-blend process.

Abstract: A process for preparing tetrachlorocyclobutenone from hexachlorocyclobutene comprises reacting (a) hexachlorocyclobutene withI. (b) anhydrous sulphuric acid and (c) sulphur trioxide; orII. (b) anhydrous sulphuric acid and (d) phosphorus pentoxideat a temperature of 30.degree.-140.degree. C.;the starting materials being present in the following molar ratios at the start of the reaction:for I,(a):(c)=0.67-10, and(b):(c)=0.1-10;and for II,(a):(d)=0.67-10 and(b):(d)=0.5-20.