摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von trimeren Isocyanaten in einem Reaktionsgemisch (R), welches mindestens ein cyclisches Isocyanat (A), gegebenenfalls mindestens ein weiteres Isocyanat (B) und mindestens einen fluorhaltigen Katalysator (C) enthält. 3 Moleküle der Komponente (A) und gegebenenfalls der Komponente (B) werden dabei trimerisiert. Das mindestens eine cyclische Isocyanat (A) weist mindestens einen Cycloalkanring mit mindestens vier Ringkohlenstoffatomen auf, wobei der Cycloalkanring zwei zueinander β-ständige oder γ-ständige Isocyanatgruppen aufweist, die in mindestens 50 Mol-% der Gesamtstoffmenge des mindestens einen cyclischen Isocyanats (A) in trans-Konfiguration zueinander angeordnet sind.
摘要:
The present invention relates to a novel process for preparing polyisocyanates having isocyanurate groups by a partial trimerization of (cyclo)aliphatic diisocyanates in the presence of at least one trimerization catalyst from the group of ammonium salts of lactames and to the use of the thus obtainable polyisocyanates having isocyanurate groups as a polyisocyanate component in polyurethane coatings.
摘要:
The invention relates to organic chemistry, specifically to an improved method for preparing melamine cyanurate, which is used in various compositions as a fire retardant. When reacting cyanuric acid and melamine in a molar ratio in the presence of 2-30% water based on the mass of dry reagents at a temperature of from 10 to 100°? in air counterflows at 2-10 kp/cm2, melamine cyanurate with a high percentage yield of end product is produced and with a reduced consumption of energy. A further advantage of the proposed method consists in the possibility of implementing said method in the continuous mode.
摘要:
A process for the production of N,N',N"-trisubstituted isocyanuric acids by heating an N-substituted carbamic acid derivative represented by the general formula (1): (1) [wherein R is a hydroxyl-protecting group; and Z is a group represented by the general formula (2) or (3): (wherein R' is hydrocarbyl or a heterocyclic group having a carbon atom at the site attached to the adjacent oxygen atom)] [at a temperature ranging from 95 °C to 145°C when Z is a group represented by the formula (3)] to thereby obtain an N, N', N"-trisubstituted isocyanuric acid represented by the general formula (4): (4) (wherein R is as defined above). According to the process, N, N', N"-trisubstituted isocyanuric acids can be simply produced in high yield.
摘要:
The present invention provides heterocyclic vinylic compounds that can be used to form biocidal polymers. The polymers thus generated can used alone or can be grafted onto textiles, fabrics and polymers. The polymers are readily converted to N-halamine structures on exposure to a halogen source such as commercially available chlorine bleach. The N-halamine derivatives exhibit potent antibacterial properties against microorganisms and these properties are durable and regenerable.
摘要:
The invention describes fluorochemical triazine compounds, compositions containing the fluorochemical triazine compounds, the process for preparing the fluorochemical compounds and compositions, substrates treated with the fluorochemical compounds, melt extrusion of fibers and films containing the fluorochemical compounds and compositions, and coating, polish and marine antifouling compositions to provide oil and water repellency to substrates.