Abstract: The present invention is directed to a process for the production of polyurethane moldings by reacting a reaction mixture comprising(a) an organic polyisocyanate(b) a compatible polyol blend comprising(i) at least one polyether polyol having an hydroxyl functionality of from 2 to 8, and a molecular weight of from 350 to below 1800, and(ii) at least one hydroxyl functional organic material containing from 2 to 8 hydroxyl groups and having a molecular weight below 350, components (i) and (ii) being used in a weight ratio of component (b)(i) to (b)(ii) of from about 10:1 to about 1:10, and(iii) no more than 45% by weight based on the weight of component (b) of an active hydrogen containing compound having a molecular weight of 1800 or more,said reaction mixture being processed as a one-shot system by the RIM process at an isocyanate index of from about 70 to about 130.

Abstract: A polycarbonate film obtained by dispersing carbon black in a solution of thermoplastic aromatic polycarbonate, producing a cast film, and subsequently stretching the cast film, is characterized in that its elongation at break is greater than that of a corresponding unstretched similarly filled film having an identical thickness.

Abstract: The present invention is directed to a process for the production of optionally cellular, polyurethane elastomer moldings or optionally cellular, rigid structural polyurethanes by reacting a reaction mixture containing(i) a polyisocyanate,(ii) a high molecular weight polymer having at least two hydroxy groups and having a molecular weight of 400 to about 10,000,(iii) about 5 to 50% by weight, based on the weight of component (ii) of a chain-extender having at least two hydroxy groups and(iv) about 0.05 to 10 weight percent, based on the weight of components (ii) and (iii) of a salt based on a carboxy functional siloxane and an amidine group-containing compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.

Abstract: The present invention is directed to substantially linear polyurethanes obtained from 1 mol of relatively high molecular weight macrodiols such as polyesters, polyethers and polycarbonates having a molecular weight of 400 to 5000, preferably about 500 to 3000, about 1.5 to 16.5 mols of aromatic diisocyanates, optionally about 0.01 to 1 mol of chain breaking agents in the form of compounds which are monofunctional in their reaction with isocyanates, and about 0.5 to 15 mols of low molecular weight, difunctional chain lengthening agents, characterized in that at least 10 mol-% of the chain lengthening agents is 2,2,4-trimethylpentanediol-(1,3) and the remaining chain lengthening agents, having molecular weights of 62 to 399 (preferably 62 to 250), are preferably diols.

Abstract: Molded articles are produced in a two-stage process. In the first stage, an organic polyisocyanate is reacted with an organic compound containing at least two epoxide groups (NCO: epoxide equivalent ratio of 1.2:1 to 500:1) in the presence of a tertiary amine catalyst. This reaction is stopped when no more than 65% of the isocyanate groups have reacted by adding an alkylating sulfonic acid alkyl ester of methyl iodide and/or of dimethyl sulfate in an amount equivalent to the amount of tertiary amine catalyst present. A latent catalyst capable of being activated by heat is subsequently added to the intermediate product and the resultant mixture is heated in a mold to complete the crosslinking of the intermediate product and to form the molded article.

Abstract: The present invention is directed to polyisocyanates which have improved compatibility with polyester coreactants and improved solubility in apolar solvents, the polyisocyanates containing, based on solids,(a) about 15 to 85 wt. % of an isocyanurate group-containing polyisocyanate based on hexamethylene diisocynate and(b) about 15 to 85 wt. % of a biuret group-containing polyisocyanate based on hexamethylene diisocyanate.The present invention is additionally directed to two-component polyurethane coating compositions based on the above polyisocyanates and branched polyester polyols. Finally, the present invention is directed to a process for preparing the polyisocyanate.

Abstract: Diisocyanates and isomeric mixtures of diisocyanates corresponding to the formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein are made by phosgenating diamines corresponding to the formula ##STR2## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein at a temperature of from -20.degree. to 250.degree. C. These diisocyanates are particularly useful as starting materials for the production of polyurethanes by the isocyanate polyaddition process.

Abstract: Polyurethanes containing uretdione rings are produced by reacting a polyisocyanate containing a uretdione ring with a relatively high molecular weight dihydroxyl compound in the presence of a bismuth salt of an organic carboxylic acid and a low molecular weight aromatic diamine. The low molecular weight aromatic diamine is used in a quantity which is 5 to 10 times the quantity of bismuth salt used. These solid polyurethanes are formed in relatively short reaction times and possess outstanding mechanical properties.

Abstract: In the production of an S-substituted isothiourea including the functional group ##STR1## in which R.sup.1 is an alkyl, alkenyl, aryl or aralkyl radical, wherein a thiourea including the functional group ##STR2## is reacted with an etherifying agent to replace H by R.sup.1, the improvement which comprises effecting the reaction in two steps, in the first step reacting the thiourea material with an etherifying agent including the radical Rin whichR is an alkyl, alkenyl aryl or aralkyl radical different from R.sup.1thereby to produce the ether ##STR3## and in the second step reacting the ether with a compound of the formula R.sup.1 SH. The process is particularly applicable to the production of the known herbicide ##STR4## from the corresponding thiourea where in the first step methyl bromide or methyl iodide is used to form the S-methyl isothiourea which is then interchanged with ethyl mercaptan. Higher overall yields and/or economies are thereby achieved.

Abstract: Flexible polyurethane foams having increased compression hardness are produced by reacting an organic polyisocyanate with a mixture of polyols in the presence of a blowing agent and optionally known additives such as catalysts, emulsifiers, etc. The mixture of polyols is (1) 75-95 wt % polyether polyol with terminal OH groups having a functionality of from 2 to 4 and an OH number of from 25 to 60 and (2) 5-25 wt % polyether polyol having a functionality of at least six and an OH number of from 150 to 200 which is the reaction product of an alcohol having a functionality of at least six and propylene oxide which has been modified to contain 5-50 wt % terminal ethylene oxide groups. These foams are useful in furniture applications.

Abstract: Hyaluronic acid having controlled molecular weight and substantially free of protein and nucleic acids can be prepared from a hyaluronidase-negative or hyaluronidase inhibited microbiological source. Product may be used as replacement fluid in mammals.

Abstract: The present invention is directed to a process for the production of prepolymers containing free tertiary isocyanate groups by reacting(a) an organic diisocyanate containing one isocyanate group attached to a primary aliphatic carbon atom and an isocyanate group attached to a tertiary aliphatic or cycloaliphatic carbon atom with(b) a polyester polyol having a molecular weight of 800 to 12,000 and a hydroxyl functionality of 2 to 6 at an NCO/OH equivalent ratio of 1.6:1 to 2:1 to provide prepolymers having a molecular weight of about 1000 to 3000 and an NCO content of about 4 to 12%.The present invention is also directed to the prepolymers containing free isocyanate groups obtained by this process and to their use for the production of polyurethane lacquers and coatings.

Abstract: The present invention relates to phthalimide compounds of the formula (I) ##STR1## wherein X denotes H or halogen, for example chlorine or bromine,a and b independently of one another denote 0 or 1 andR denotes a C.sub.1 -C.sub.4 -alkyl radical,which, in combination with alkali metal salts, are suitable as flameproofing agent combinations for thermoplastic, branched, aromatic polycarbonates, and the preparation of these compounds.

Abstract: The present invention is directed to a process for the production of polyurethane or polyurea elastomeric molded articles according to the reaction injection molding process by reacting a polyisocyanate, a high molecular weight isocyanate reactive component and optionally a diamine chain extender, wherein the improvement is based on the use of the reaction product of a polyepoxide containing at least two epoxide groups with at least one mol of an aromatic diamine per epoxide group wherein the polyepoxide is present in an amount sufficient to provide about 0.5 to 25% by weight of the polyepoxide based on the weight of all the isocyanate reactive components. The present invention is also directed to the isocyanate reactive components for use in this process and to the molded articles produced in accordance with this process.

Abstract: The device of the present invention is used for the production of a reaction mixture. The device has a housing with a guide bore provided therein for an injection piston. Feed lines with entry openings and recirculation lines are provided. The device is also provided with a rotary slide valve which contains a mixing chamber through which the ejection piston can pass. The slide valve is movable to a position that frees the entry openings to the mixture chamber and to a position that connects the entry openings (through flow channels provided in the rotary slide valve) with the recirculation lines.

Abstract: The present invention relates to the preparation of polyether-sulphones from polycarbonates.

Abstract: Polyurethanes which have been prepared or combined with another material are made by combining or applying a polyurethane-forming reaction mixture or polyurethane to another material such as a PVC foil or textile. The polyurethane-forming mixture or polyurethane is made up of an organic polyisocyanate, a high molecular weight isocyanate reactive material, a catalyst and a stabilizer against thermolysis and contact discoloration. The required stabilizer is an epoxide having an epoxide equivalent weight between 57 and 10,000. Other additives commonly used in polyurethane chemistry such as blowing agents, chain extenders and surfactants may also be employed. The polyurethane composites thus produced are characterized by improved thermal stability and reduced discoloration.

Abstract: Elastic molded articles having a closed surface layer are made from polyurea elastomers by the reaction injection molding technique. These polyurea elastomers are prepared from a polyisocyanate in which all of the isocyanate groups are aromatically bound, a polyether and a diamine. The polyether has at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000. At least 50% of the isocyanate-reactive groups in the polyether are primary and/or secondary amino groups. The diamine has a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups. Known auxiliary agents and additives may also be employed.

Abstract: The present invention relates to the use of perfluoroalkanesulphonic acid aryl esters as anti-drip agents in flame-repellant moulding compositions based on thermoplastic aromatic polycarbonates, moulding compositions containing flameproofing agents and these anti-drip agents and a process for the preparation of such moulding compositions.

Abstract: The present invention relates to a process for the preparation of mixtures of isocyanate and water which are stable for a short time for glueing particulate material, in particular chips, fibers, or the like, in which isocyanate is injected at high pressure into the water characterized in that the water is delivered to the site of injection as a stream under low pressure, and to an apparatus for carrying out such process.