Abstract: The present invention relates to composite elements containing, as a layer, at least one thermoplastic polymer, adhering to which, as a layer, a polyisocyanate polyaddition product is attached, and a process for the production thereof.

Abstract: The present invention relates to composite elements containing, as a layer, at least one thermoplastic polymer, adhering to which, as a layer, a polyisocyanate polyaddition product is attached, and a process for the production thereof.

Abstract: The invention provides composite elements containing a thermoplastic polymer layer, adhering to a layer comprising the reaction product of a reaction mixture containing a prepolymer containing isocyanate groups produced by the reaction of at least one isocyanate and one polycarbonate polyalcohol with a functionality of 2 to 3 and a hydroxyl number of about 40 to about 400 mg KOH/g, based on the condensation of carbonates with diols and/or triols with a molecular weight of about 62 to about 3000 g/mol, the prepolymer having an isocyanate group content of about 5 to about 48%, compounds reactive with respect to isocyanates and optionally catalysts blowing agents and/or auxiliary substances and/or additives. The present invention further provides a process for the production the composite elements.

Abstract: The invention provides composite elements containing a thermoplastic polymer layer, adhering to a layer comprising the reaction product of a reaction mixture containing a prepolymer containing isocyanate groups produced by the reaction of at least one isocyanate and one polycarbonate polyalcohol with a functionality of 2 to 3 and a hydroxyl number of about 40 to about 400 mg KOH/g, based on the condensation of carbonates with diols and/or triols with a molecular weight of about 62 to about 3000 g/mol, the prepolymer having an isocyanate group content of about 5 to about 48%, compounds reactive with respect to isocyanates and optionally catalysts blowing agents and/or auxiliary substances and/or additives. The present invention further provides a process for the production the composite elements.

Abstract: Activators with reduced volatility that are liquid at room temperature are obtained as the reaction product of (A) a secondary amine or primary alcohol having at least one tertiary amine group, (B) a polyisocyanate of the diphenylmethane series having a functionality of from 2.5 to 4.0 and an OH-functional reactive component capable of addition to isocyanate. These activators are useful for the production of polyurethane foams having improved emission behavior.

Abstract: Activators with reduced volatility that are liquid at room temperature are obtained as the reaction product of (A) a secondary amine or primary alcohol having at least one tertiary amine group, (B) a polyisocyanate of the diphenylmethane series having a functionality of from 2.5 to 4.0 and an OH-functional reactive component capable of addition to isocyanate. These activators are useful for the production of polyurethane foams having improved emission behavior.

Abstract: The present invention is directed to an improved process for the preparation of composite bodies by back-foaming plastics sheets with a polyurethane reaction mixture. The improvement is in using certain hydroxycarboxylic acids present in the alkali salt form as the catalyst.

Abstract: Improved gel compounds based on reaction products of polyols and polyisocyanates are characterized in that the polyol component consists of a mixture of a) one or more polyols having hydroxyl values below 112 and b) one or more polyols having hydroxyl values of 112 to 600 and in that the isocyanate index of the reaction mixture is in the range from 15 to 70. They may be used as pressure-distributing elements.

Abstract: A process for the production of polyurethane foams by reacting a reaction mixture consisting essentially ofa) a polyisocyanate component, withb) a polyol component free from salt groups, in the presence ofc) at least one blowing agent,d) salts of ester-functional .alpha.,.beta.-unsaturated carboxylic acids and, optionally,e) other auxiliaries and additives typically used in polyurethane chemistry.Component d) the salts of ester-functional .alpha.,.beta.-unsaturated carboxylic acids are the reaction products of (i) monohydric or polyhydric alcohols, with (ii) unsaturated dicarboxylic acids or unsaturated dicarboxylic anhydrides, which contain on a statistical average at least one alkali metal carboxylate group and at most 0.5 alcoholic hydroxyl groups per molecule. The present invention also relates to the composites produced by back-foaming of a plastic film as a surface layer wherein the foam is produced by the process described above.

Abstract: The use of solutions of zinc carboxylates having 8 to 24 carbon atoms in aliphatic polyamines having molecular weights of from 131 to 500 having a total of 2 or 3 primary, secondary and/or tertiary amine nitrogen atoms as additives for the formation of a compact surface in the production of molded foams having a maximum gross density of 500 kg/m.sup.3 from organic polyisocyanates, polyether polyols, chain lengthening agents, water and optionally other auxiliary agents and additives.

Abstract: This invention relates to the use of mono- to tetrahydroxyalkyl monoureas corresponding to the following general formula ##STR1## in which A represents a C.sub.2 -C.sub.6 -alkylene group optionally containing OH-groups,n=0, 1 or 2.n'=1 or 2 andn+n'=1, 2, 3 or 4, preferably 2-4 and, more preferably, 3,as reactive flameproofing agents in quantities of from 3 to 100 parts by weight and preferably in quantities of from 11.5 to 50 parts by weight, based on 100 parts by weight of relatively high molecular weight compounds having molecular weights of from 400 to 10,000, preferably relatively high molecular weight polyols, for the production of flameproofed polyurethane foams, and preferably integral skin foams or semirigid to rigid foams. The invention also relates to dispersions or suspensions of mono- to tetrapolyhydroxyalkyl monoureas corresponding to the above formula in relatively high molecular weight compounds containing terminal hydroxyl, primary or secondary amino, carboxyl or hydrazide groups.

Abstract: The invention relates to the use of poly-N,N-di-(hydroxyalkyl)-polycarbonamides of aliphatic or cycloaliphatic polycarboxylic acids as reactive flame-retardants for polyurethane foams, and in particular polyurethane integral skin foams and polyurethane rigid foams which are produced with the aid of organic blowing agents. These reactive flame-retardants are added in quantities of from 11.5 to 50 parts by weight, and most preferably from 12 to 25 parts by weight, based on 100 parts of the relatively high molecular weight polyol used for the preparation of the foam. The integral skin or rigid foams produced are flame-resistant and because of their reduced flammability are capable of passing various regulation fire tests, and in particular those testing foams for use in vehicles for transport.