Abstract: A polyurethane one-component heat-curing coating which is stable in storage and is hardened above a temperature of about 120.degree. C., comprising a polyol compound having a low glass transition temperature, and a blocked polyisocyanate compound, wherein the blocked polyisocyanate compound is the reaction product of a polyisocyanate compound and a secondary amine compound having the formula: ##STR1## wherein R is selected from the group consisting of hydrogen atom, C.sub.3 -C.sub.9 alkyl radical, unsubstituted cycloalkyl radical, cycloalkyl radical substituted by C.sub.1 -C.sub.4 alkyl radicals, or heteroatom-containing cycloalkyl radical, wherein each R is identical to or different from each other; R.sup.1 is selected from the group consisting of alkyl radical, or cycloalkyl radical, wherein each R.sup.1 is identical to or different from each other; or R and R.sup.1 are chemically bonded therebetween, thereby forming a ring structure.

Abstract: A method for producing a polyaddition product of isophorone diisocyanate and diols which comprises, reacting a uretidione group-containing dimer of isophoronediisocyanate, which is decomposable by heat into 98% isophorone diisocyanate, with a diol, wherein the ratio of NCO to OH groups is such that the final polyaddition product has free terminal NCO groups, or free terminal OH groups.

Abstract: A lawnmower with rotating cutting blades has a central handle (1) provided with a hook (2) for mounting a grass collecting receptacle (3). The central handle (1) is so shaped and arranged as to permit easy lateral access during removal and replacement of the receptacle (3). The receptacle (3) is provided with a metal bail (4) for securement to the hook (2) of the handle (1). The base (6) of the central handle (1) pivotally supports a deflector (5) held in operative position by means of a strap (24) secured to the hook (2) of the central handle (1).

Abstract: A process for producing a substantially isocyanurate-free uretidione dimer of isophorone diisocyanate, which is more than 98% decomposable by heat to isophorone diisocyanate, which comprises dimerizing isophorone diisocyanate, optionally in an inert organic solvent, in the presence of a catalyst of the formula X.sub.m P(NR.sub.2).sub.3-m wherein m=0, 1, 2; X=Cl OR of R wherein R is selected from the group consisting of the same or different aklyl radical, aralkyl radical, cycloalkyl radical, substituted cycloalkyl radical and radicals wherein two or more of the aforementioned radicals form a hererocyclic ring together with the nitrogen atom; at temperatures of 0.degree.-80.degree. C., isolating the resulting 1,3-diazacyclobutane-2,4-dione, after 5-70% conversion, without previous inactivation of the catalyst, from the reaction mixture as the residue of a thin film distillation and isolating the catalyst and monomer as the distillate.

Abstract: Polyisocyanatoisocyanurates of the formula ##STR1## wherein the R groups may be the same or different and are aliphatic divalent radicals selected from the group consisting of divalent aliphatic radicals having the formulas ##STR2## and n is a whole or fractional number from 1 to 5, are useful as isocyanate hardeners in polyurethane resin coatings.

Abstract: A polyurethane powder enamel free of volatile cleavage products comprising an adduct of the uretidinedione dimer of isophorone diisocyanate with a diol, wherein the adduct has the formula ##STR1## wherein R= ##STR2## X=NCO or ##STR3## R"=a divalent aliphatic, cycloaliphatic, aromatic or araliphatic hydrocarbon radical or a diol, n>1, andR'=a monoalcohol radical or primary or secondary monoamine radical with 1-30 C-atoms, wherein the NCO/OH ratio of the dimer to the diol is from 1:0.5 to 1:0.9, the dimer/diol molar ratio is from 2:1 to 6:5, the average molecular weight is between 550 and 4300, and the melting point is .gtoreq.70.degree. C. and .ltoreq.130.degree. C., and wherein the uretidinedione groups present in the adduct are cleavable with heat into .gtoreq.98% --NCO groups, and a polyol having an OH functionality .gtoreq.3.4 to .ltoreq.7, an average molecular weight of 2000 to 5000, an OH number between 30 and 100 mg KOH/g, a viscosity of <100,000 mpa.s at 160.degree. C., and a melting point .

Abstract: In a process for the trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula: ##STR1## wherein X represents the same or different radicals selected from the group consisting of C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.8 cycloalkyl, and C.sub.2 -C.sub.20 aralkyl; two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quaternary nitrogen atoms forming a hetero-ring through a common hetero-atom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine, and N,N'-dimethylpiperazine; R is alkyl, cycloalkyl or aralkyl, R" is R or hydrogen; R+R" together form a C.sub.1 -C.sub.12 alkyl radical; R' is hydrogen, hydroxyl or a C.sub.1 -C.sub.12 alkyl radical, optionally containing a CH.sub.(3-b) Z.sub.

Abstract: A stoving enamel comprising (a) 30-70% by weight of a mixture of a polymer containing hydroxyl groups having a hydroxyl number between 40 and 240 mg KOH/g with an isocyanurate-free derivative of isophorone diisocyanate containing uretidinedione groups and blocked isocyanate groups, (b) 0-3% by weight of a cross-linking catalyst, (c) 30-60% by weight of an organic solvent, (d) 0-65% by weight of a filler or pigment, (e) 0-5% by weight of a dye, and (f) optionally 0.1-3% by weight of leveling agents, gloss improvers, antioxidants, and/or stabilizers, has improved storage stability, reduced curing time and reduced liberation of blocking agent during cure.

Abstract: A single component enamel composition comprising a polyester component containing more than one hydroxy group in the molecule and a hardener component, said hardener comprising at least one diisocyanate capped with .epsilon.-caprolactam and/or at least one polyisocyanate containing isocyanaturate groups capped with .epsilon.-caprolactam.

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: Storage stable epoxy resin powder coating compositions are disclosed, which contain a solid epoxy resin and, as hardening agent, a blocked polyisocyanate compound or isocyanate terminated polymer, wherein the blocking agent is an imidazoline compound.

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

Abstract: A method for the production of blocked isocyanate- and isocyanurate group-containing compounds which comprises reacting a monomeric cycloaliphatic polyisocyanate to form an intermediate mixture comprising an isocyanurate containing at least two free isocyanate groups; and blocking the intermediate isocyanurate mixture with dimethylketoxime at 50.degree.-120.degree. C., wherein the amount of said dimethylketoxime is such that one equivalent of NCO group reacts with one equivalent of the dimethylketoxime. A mixture containing isocyanurate and blocked isocyanate groups which comprises at least 10% by weight of a cycloaliphatic isocyanurate containing at least two isocyanate groups blocked with dimethylketoxime and a monomeric polyisocyanate blocked with dimethylketoxime in such amounts as necessary to complete 100% by weight of the mixture, and wherein the unblocked NCO-group content of the monomeric polyisocyanate is less than 0.5% by weight.

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 method of preparing 2,4,6-triketohexahydrotriazines which comprises catalytically trimerizing an organic isocyanate at 60.degree.-150.degree. C. in an inert, polar solvent present in an amount of 5-40 weight % with respect to the quantity of said isocyanate, in the presence of 0.1-5 weight % of a catalyst of the formula ##STR1## or hydrated derivatives of said catalyst, wherein R is selected from the group consisting of hydrogen and C.sub.1 -C.sub.4 alkyl, and Me.sup.+2 is a bivalent metal cation; interrupting the trimerization at a conversion of about 50% by cooling; and then isolating the 2,4,6-triketohexahydrotriazine.

Abstract: In a rotary-scythe grass mower a device is provided for impelling the grass clippings towards a porous bag or other collecting device, the device being within the mower hood and rotating with the cutter blade or blades. The device may conveniently comprise upwardly and outwardly curving tines in a rake-like or comb-like arrangement on the cutter blade or blades, and/or horizontal rods extending radially from the cutter shaft above the cutter blade or blades.

Abstract: A process for the preparation of blocked polyisocyanates which comprises reacting a polyisocyanate with a cyclic amidine of the formula: ##STR1## wherein R are the same or different substituents selected from the group consisting of hydrogen, alkyl, cycloalkyl, aralkyl and aryl, and wherein either R' and R or two R' taken together form a cycloaliphatic ring, and wherein the reaction is carried out at temperatures of 0.degree.-150.degree. C. Polyisocyanates blocked with 6-membered ring bicyclic amidines.

Abstract: Powdered, heat-hardenable coating materials with high storage stability and a grain size smaller than 0.25 mm based upon hydroxy-group-containing polyesters with melting points between 40.degree. and 120.degree. C., blocked polyisocyanates and optionally catalysts, wherein the coating material contains polyisocyanates blocked with cyclic amidines of the general formula ##STR1## wherein R=equal or different substituents selected from the group consisting of hydrogen, alkyl-, cycloalkyl-, aralkyl-, and alkyl radicals. A method for the production of the above mentioned coating materials and a process for coating substrates with these materials is also disclosed.