Abstract: The invention relates to a process for producing metal foams of controlled structure and to the metal bodies in foam form obtained in this way, wherein metals from group IB to VIIIB of the periodic system of the elements are added before and/or during the formation of the foam.

Abstract: The invention relates to a process for producing metal foam and to a metal body produced using this process.

Abstract: A process for producing metal foams comprising mixing one or more metal powders, if desired combined with particulate metallic or nonmetallic, e.g., mineral, additives of varying particle size, with a gas-liberating blowing agent; optionally preheating the mixture in an open or closed mold to a temperature below the decomposition temperature of the blowing agent; subsequently heating the mixture to a temperature above the melting point of the lowest-melting metal in such a way that the temperature rises from the equilibrium decomposition temperature of the blowing agent to the melting point of the metal in a time which is shorter than the time required to reach the equilibrium state in the blowing agent/blowing gas system at this temperature and subsequently cooling the resulting metal foam to a temperature below the melting point of the lowest-melting metal is provided as well as foamed metal bodies obtained using the inventive process.

Abstract: The invention relates to a process for producing metal foams and to the metal bodies in foam form which are obtained in this way.

Abstract: The invention relates to block copolymers of the general average formula with siloxane blocks which are linked via rigid spacers, and to their use as surface-active agents.

Abstract: A process for separating molten metals, the molten metals being treated with metal hydrides is provided. The molten metals employed are from Groups II-IV of the Periodic Table of Elements and the subgroups, including their alloys, and are distinguished by the fact that the metals or alloys are reacted with a metal hydride in a molten bath.

Abstract: The present invention relates to iodonium salts containing urethane groups of reduced crystallization tendency, to a process for their preparation, and to their use for the radiation curing of cationically curing compositions.

Abstract: The present invention describes the use of zinc treated with metal hydride in organometallic synthesis.

Abstract: The invention relates to the use of silicone-polyether copolymers of the formula I 1

Abstract: The invention relates to activated magnesium metal, to a method of activating magnesium metal and to its use for the preparation of organomagnesium compounds. The activated magnesium metal is obtainable by reacting molten magnesium metal with magnesium hydride; or by heating a mixture of magnesium metal and magnesium hydride until molten.

Abstract: The invention relates to the use of metal salts of ricinoleic acid or solutions thereof in water or in organic solvents in producing polyurethane foams.

Abstract: The invention provides for a composition comprising a mixture of Si--C- and Si--O--C- linked silicone polyether block copolymers and the use of said compositions as an additive in the production of polyurethane foams.

Abstract: Block copolymers of the general average formula ##STR1## where, A=radical R.sup.1, radical D, or radical E,D=radical of the formula--R.sup.2.sub.f --O--(C.sub.2 H.sub.4-g R.sup.5.sub.g O--).sub.n (CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2-i R.sup.6.sub.i --O--).sub.m R.sup.3,and E isa) a radical of the general formula --R.sup.2.sub.f --O--(C.sub.2 H.sub.4-g R.sup.5.sub.g O--).sub.n R.sup.3 and/orb) an epoxy-functionalized alkyl substituent which may contain heteroatoms and/orc) a monohydroxylalkyl, dihydroxylalkyl, or trihydroxyalkyl substituent which may also be aromatic or branched and partially or fully etherfied or esterfied and/ord) a halogen- or pseudohalogen-substituted alkyl, aryl, or aralkyl radical which may also be branched,provided that there are two or more different polyether copolymer units in the block copolymer, the remaining variables being defined herein, are disclosed, as well as their use as surface-active substances, in particular as additives in the production of polyurethane foams.

Abstract: The invention relates to the use of polysiloxane-polyoxyalkylene copolymers of the general formula I ##STR1## as additives in the production of polyurethane foams.

Abstract: The invention relates to the use of silicone-polyether copolymers of the formula I ##STR1## as surface-active substances in the production of high-resilience polyurethane foams.

Abstract: The invention relates to the use of block copolymers having linked siloxane blocks of the general average formula ##STR1## as additive in the production of polyurethane foams.

Abstract: Polyether siloxanes, which are linked to the polysiloxane backbone through Si--C bonds, are synthesized by reacting given polysiloxanes with a compound having at least one epoxide group in such amounts, that there are at least two epoxide groups per OH group, in the presence of Lewis acids at temperatures not exceeding 60.degree. C. or in the presence of complex catalysts, which accelerate the addition between epoxide groups and hydroxyl groups, at temperatures up to 140.degree. C., the reaction optionally being carried out in the presence of an inert solvent. The polyether siloxanes obtained have a defined functionality and are free of excess, unreacted polyol components.

Abstract: Polysiloxane-polyoxyaikylene block copolymers, which are intended for the production of polyurethane foams, are prepared. The foams obtained have an improved, finer cell structure and the collapse of the foams is reduced. It is essential for the invention that a mixture of polyoxyalkylene groups is present in the polysiloxane-polyoxyalkylene block copolymers. Further particulars are laid down for selecting the different polyoxyalkylene groups with regard to the respective molecular weights and the ratio of polyoxyalkylene groups to one another.

Abstract: Polysiloxane-polyoxyalkylene block copolymers, which are intended for the production of polyurethane foams, are prepared. The foams obtained have an improved, finer cell structure and the collapse of the foams is reduced. It is essential for the invention that a mixture of polyoxyalkylene groups is present in the polysiloxane-polyoxyalkylene block copolymers. Further particulars are laid down for selecting the different polyoxyalkylene groups with regard to the respective molecular weights and the ratio of polyoxyalkylene groups to one another.

Abstract: Polysiloxane-polyoxyalkylene block copolymers having different polyoxyalkylene blocks in the average molecule are prepared. The mixture of the polyoxyalkylene blocks consists of at least one polyoxyalkylene group A and at least one polyoxyalkylene group B and/or at least one polyoxyalkylene group C, each polyoxyalkylene group A having an average molecular weight of 600 to 5,500 and consisting of 20 to 90% by weight of oxyethylene units and 80 to 10% by weight of oxypropylene units, polyoxyalkylene group B having an average molecular weight of 500 to 5,000 and consisting of 2 to 19% by weight of oxyethylene units and 98 to 81% by weight of oxypropylene units, polyoxyalkylene group C having an average molecular weight of 1,500 to 4,500 and consisting of oxypropylene units. Up to 20% by weight of the oxypropylene units is replaceable by oxybutylene units and the molar ratio of polyoxyalkylene groups A to the sum of the polyoxyalkylene groups B and C is 1:4 to 4:1.