摘要:
The present invention is directed to a continuous process for the preparation of copolycarbonates of sulfonyl diphenol (SDP) containing at least about 15, preferably about 15 to about 80 percent by weight of SDP and characterized in the particular system catalyzing the process reaction. The invention thus entails improvements and modifications to the known interfacial polycondensation process rendering it applicable to the preparation of copolycarbonates containing a high level of SDP comprising a combination of catalysts namely a phase transfer catalyst and a condensation catalyst.
摘要:
Die Erfindung betrifft ein Verfahren zur Umwandlung eines die funktionelle Gruppe enthaltenden S-substituierten Isothioharnstoffs in den entsprechenden S-substituierten Isothioharnstoff mit der funktionellen Gruppe wobei in den Formeln (C) bzw. (D)
R ein jeweils gegebenenfalls substituierter Alkyl-, Alkenyl-, Aryl- oder Aralkyl-Rest ist und R 1 Wasserstoff oder ein Alkyl-, Alkenyl-, Aryl- oder Aralkyl-Rest ist, der jedoch von R verschieden ist, weiches dadurch gekennzeichnet ist, daß man die Ausgangsverbindungen der Formel (C), gegebenenfalls in Gegenwart eines Verdünnungsmittels und gegebenenfalls in Gegenwart eines Katalysators, mit einer Verbindung der Formel
umsetzt, wobei man gegebenenfalls die als Nebenprodukte gebildeten Verbindungen der Formel R-SH durch Destillation während oder nach der Reaktion aus dem Reaktionsgemisch entfernt.
Nach diesem Verfahren (Alkylthio-Austauschreaktion) kann z.B. 4-Amino-6-tert.-butyl-3-methylthio-1,2,4-triazin-5(4H)-on mit hohen Ausbeuten direkt in die entsprechende 3-Ethylthio-Verbindung (ein Selektiv-Herbizid) umgewandelt werden.
摘要:
The invention relates to a thermoplastic molding composition comprising the extrudate of a blend of e therm6- plastic polyester and a reinforcing amount of a reinforcing agent. An improvement in the impact performance of the composition is disclosed to result upon the incorporation therewith of a blocked (end-capped) polyisocyanate prepolymer.
摘要:
The present invention is directed to thermoplastic molding compositions comprising poly(ethylene terephthalate), aromatic polycarbonate, a certain graft modified rubber, and an amount of added talc sufficient to control the warpage of the composition and to maintain a high level of impact strength.
摘要:
The present invention is directed to a polyol mixture comprising the reaction product of at least two polyols which normally are incompatible with each other and an organic isocyanate, the isocyanate to hydroxyl equivalent ratio being from 1:4 to 1:35.
摘要:
The present invention is directed to a process for the preparation of an isocyanate-terminated prepolymer having a content of unreacted diisocyanate of less than about 2% by weight, preferably less than about 1% by weight, based on the weight of the isocyanate-terminated prepolymer, and containing internal urethane groups based on 4,4'-diisocyanato-dicyclohexyl-methane by
a) preparing an OH-terminated prepolymer from
i) a high molecular weight polyol component, and/or ii) a low molecular weight isocyanate-reactive component, and iii) a polyisocyanate component comprising 4,4'-diisocyanato-dicyclohexyl methane
at an NCO/OH equivalent ratio of about 0.5:1 to 0.9:1; b) forming the isocyanate-terminated prepolymer by reacting the OH-terminated prepolymer with a polyisocyanate other than 4,4'-diisocyanato-dicyclohexyl-methane containing aromatically-, aliphatically- and/or cycloaliphatically-bound isocyanate groups at an NCO:OH equivalent ratio, based on the free -OH groups of component (a), of about 1.6:1 to 15:1, and c) reducing the amount of unreacted diisocyanate to less than about 2% by weight, based on the weight of the isocyanate-terminated prepolymer.
The present invention is also directed to the products prepared by this process and their use in one-component, moisture-cure systems or as the isocyanate component in two-component polyurethanes.
摘要:
The present invention is directed to a thermoplastic molding composition comprising a high molecular weight polyester, a reinforcing amount of a reinforcing agent and a polyepoxy compound characterized in that it contains more than two terminal epoxy functionalities per molecule.
摘要:
The invention is directed to a moulding composition comprising an intimate, well dispersed blend of thermoplastic polyurethane, thermoplastic polyphosphonate and thermoplastic polycarbonate which composition is characterized by an improved level of flame resistance. A process for the preparation of said composition is also disclosed.
摘要:
Infektiosität und Vermehrung von Influenzaviren in aufeinanderfolgenden Zahlen von Zellen der gleichen flüssigen Zellkultur werden durch Einbeziehung eines Protein hydrolysierenden Enzyms in die Kultur während der Inkubation des Virus gewährleistet. Das Verfahren macht den "einstufigen Wachstumszyklus" von Viren überflüssig und ermöglicht die Großherstellung von Influenza-Vaccinen aus flüssigen Zellkulturen an Stelle der kostspieligeren bebrüteten Hühnereier. Die erhaltene Vaccine ist im wesentlichen frei von Eiereiweiß.
摘要:
The present invention is directed to a process for the production of optionally cellular, polyurea elastomer moldings by reacting a reaction mixture containing I) a polyisocyanate, II) a polyether having at least two isocyanate-reactive groups and a molecular weight of 1800 to 12,000 in which at least 50% of the isocyanate-reactive groups are primary and/or secondary amino groups, III) about 5 to 50% by weight, based on the weight of component (II) of a chain extender comprising a sterically hindered aromatic diamine and IV) about 0.5 to 20% by weight, based on the weight of components (II) and (III) of a zinc carboxylate containing from 10 to 14 carbon atoms per carboxylate group, and the reaction mixture is processed as a one-shot system by the RIM process at an isocyanate index of about 70 to 130. The present invention is also directed to an isocyanate-reactive component for use in a RIM process based on components (II), (III) and (IV).