Abstract: The invention relates to a drive device (9) comprising a housing (10), a drive shaft (14) which is mounted in the housing (10) and which comprises a shaft axis (15) and a first and a second electric drive (12,13). The drive shaft (14) can be rotated about the shaft axis (15) by means of a drive (12,13) and can be displaced in an axial manner along the shaft axis (15). The drives (12, 13) are aligned on the shaft axis (15) and comprise, respectively, a stator (16,19) and a rotor (17,20). The stators (16,19) are secured to the housing (10). The rotors (17,20) are embodied as hollow shafts and are mounted on the housing (10). The rotor (20) of the second drive (13) is rotationally secured to the drive shaft (14) by means of a linear bearing device (28), and in a manner which enables it to be axially displaced. The rotor (17) of the first drive (12) is rotationally secured to a threaded spindle (27) and is connected in such a manner that it cannot be axially displaced.

Abstract: There is described an electric machine which is used, in particular as a drive mechanism for an injection moulding machine. The electric machine comprises a first electric motor for carrying out a linear displacement and a second electric motor for carrying out a rotational movement. A displaceable means can be displaced in a rotary and linear manner by means of the rotational displacement and the linear displacement. A first axle of the first electric motor essentially coincides with a second axle of the second electric motor and the linear displacement can be carried out by means of a threaded drive. A second rotor of the second electric motor is connected to a drive means of the threaded drive. It is also possible that the first electric motor is positioned in such a manner in relation to the second electric motor that a region is formed in the same axial position. As a result, a compact machine is produced.

Abstract: The invention relates to a drive device (9) comprising a housing (10), a drive shaft (14) which is mounted in the housing (10) and which comprises a shaft axis (15) and a first and a second electric drive (12,13). The drive shaft (14) can be rotated about the shaft axis (15) by means of a drive (12,13) and can be displaced in an axial manner along the shaft axis (15). The drives (12, 13) are aligned on the shaft axis (15) and comprise, respectively, a stator (16,19) and a rotor (17,20). The stators (16,19) are secured to the housing (10). The rotors (17,20) are embodied as hollow shafts and are mounted on the housing (10). The rotor (20) of the second drive (13) is rotationally secured to the drive shaft (14) by means of a linear bearing device (28), and in a manner which enables it to be axially displaced. The rotor (17) of the first drive (12) is rotationally secured to a threaded spindle (27) and is connected in such a manner that it cannot be axially displaced.

Abstract: An injection unit for an injection-molding machine for processing thermoplastic material is designed in such a way that a direct drive (EM) which meets high dynamic requirements is used for the injection operation and that a standard motor (DM), the rotational speed of which is optimized to the material preparation process by a gear mechanism (R, RS1, RS2), is used for the material preparation, in which such dynamic requirements do not exist.

Abstract: An injection unit for an injection-molding machine for processing thermoplastic material is designed in such a way that a direct drive (EM) which meets high dynamic requirements is used for the injection operation and that a standard motor (DM), the rotational speed of which is optimized to the material preparation process by a gear mechanism (R, RS1, RS2), is used for the material preparation, in which such dynamic requirements do not exist.

Abstract: The coating of bodies rotating about an axis with a reaction mixture forming a polyurethane can be improved by making use of a sheet die disposed parallel to the axis of rotation of the body at an angle .alpha., whereby the rate of reaction of the reaction mixture and the relative movement are synchronized with the circumferential speed of the rotating body in such a way that the successive convolutions overlap in the form of scales and connect together seamlessly.

Abstract: The invention is directed to suspensions of isocyanato ureas in isocyanate prepolymers; to a process for their production by reacting mixtures of aromatic diisocyanates containing isocyanate groups of different reactivities and prepolymers containing terminal isocyanate groups, with water; and to the use of the suspensions as synthesis components in the production of polyurethane plastics.

Abstract: The instant invention is directed to a process for the production of fiber-reinforced molded products, comprising:(1) mixing at a temperature of from 10.degree. to 50.degree. C.,(a) 7 to 35% by weight of a polyisocyanate having a melting point above 100.degree. C.

Abstract: The instant invention is directed to a substantially solvent-free molding material, comprising(A) from 92 to 30% by weight, of an active-hydrogen containing prepolymer containing: from 0.3 to 4% by weight, based on the prepolymer, of free primary and/or secondary amino groups, from 1.5 to 10% by weight, based on the prepolymer, of urethane groups, and from 1.5 to 10% by weight, based on the prepolymer, of urea groups;(B) from 24 to 1% by weight of a polyisocyanate having a melting point above 120.degree. C.; and(C) from 5 to 69% by weight of an organic or inorganic fibrous material with a fiber length of from 0.1 to 100 mm, the equivalent ratio between NCO groups, including masked NCO groups, and active H-atoms of components (A) and (B) is between 1:1 and 1:1.75. The instant invention is also directed to a process for the production of the substantially solvent-free molding material.

Abstract: The instant invention is directed to a process for the production of a light fast, transparent polyurethane elastomer comprising reacting:(A) from 90 to 50% by weight, based on the polyurethane solids content, of a compound having a molecular weight of from 400 to 10,000 which has at least two Zerewitinoff active hydrogen atoms;(B) from 50 to 10% by weight, based on the polyurethane solids content, of an aliphatic and/or alicyclic polyisocyanate; and(C) from 0 to 20% by weight, based on the polyurethane solids content, of a chain-lengthening agent having a molecular weight of from 60 to 400; in the presence of:(D) catalysts for the isocyanate polyaddition reaction, the improvement wherein said catalysts, component (D), is a catalyst combination of:(a) an alkali metal hydroxide and/or alkaline earth metal hydroxide; and(b) an organometallic compound selected from the group consisting of the acetyl acetonate of iron, C.sub.1 -C.sub.

Abstract: This invention relates to storable, solvent-free, thermosetting polyurethane-based molding compositions containing a fibrous reinforcing material and to the production of fiber-reinforced moldings using these molding compositions.

Abstract: A substantially solvent-free fast low temperature curing polyurethane coating composition is disclosed as well as a procedure for synthesizing it and a procedure for applying it to a flexible substrate. It has a long shelf-life yet cures in about 1 to 5 minutes at temperatures of between about 80.degree. and 180.degree. C. to give a flexible coating. The composition is a mixture of a polyisocyanate melting at more than about 100.degree. C. and a hydroxyl bearing polyurethane prepolymer based upon branched polyethers, monomeric glycols, and polyamines made with a deficit of polyisocyanate. The composition includes an isocyanate addition catalyst and a sodium aluminum silicate type molecular sieve and may include a polyester polyol as an additive or a reactant in forming the prepolymer.

Abstract: The instant invention relates to a process for coating the back of textile floor coverings, e.g. carpets, with polyurethane foams wherein it is possible to obtain particularly firm fixing of the nap and improved anchorage of the textile filaments. The process broadly comprises:A. applying to the back of a textile floor covering a first coat consisting essentially of a reacting foamable mixture of a polyol and a large excess of polyisocyanate,B. before said first coat has been hardened, applying thereto reacting foamable mixture of substantially equivalent quantities of polyol and polyisocyanate, andC. thereafter hardening the resultant product.

Abstract: 1-SUBSTITUTED 2-METHYL-TETRAHYDROPYRIMIDINES ARE PREPARED BY REACTING AN N-substituted propylene diamine with an acetoacetic acid ester or amine at a temperature of from 0.degree. to 80.degree. C and removing the water produced in the reaction at a temperature of from 0.degree. to 80.degree. C.