Abstract:
Silver sulfadiazine-immobilized inorganic fillers are described, and their synthesis is presented. The fillers are believed to have utility in dental composites and dental adhesives to achieve potent, long-term, and none-leaching antimicrobial effects.
Abstract:
Polyethers containing 2,2,6,6-tetramethyl piperidinyl carboxylic acid ester or ether groups are provided, comprising polymeric units having the structure ##STR1## wherein X is selected from the group consisting of: ##STR2## R.sub.1 is selected from the group consisting of hydrogen, --O, alkyl, hydroxy alkyl and epoxyalkyl having from one to about eighteen carbon atoms, acyl having from one to about eighteen carbon atoms, cycloalkyl having from three to about eighteen carbon atoms; phenyl; phenalkyl and alkylphenyl having from seven to about twenty-four carbon atoms;R.sub.2 is hydrogen or hydroxy;n.sub.1 is 0 or 1;R.sub.3 is lower alkyl having from one to about six carbon atoms; andn is the average number of such units in the polymer; as well as stabilized synthetic resin compositions comprising such polyethers.
Abstract:
Solid cyanuric chloride is supplied to the gas space of a cyanuric chloride melt with the help of a gas tight product stopper. Preferably there is used for this a screw conveyor in which the gas tight stopper is formed at the end of the screw conveyor; it is most favorable if the helix ends before the last section of the tube of the screw conveyor.
Abstract:
The present invention relates to a process for the preparation of 2,4,6-trifluoro-1,3,5-triazine (TFT) from 2,4,6-trichloro-1,3,5-triazine (TCT) or from mixed chlorinated/fluorinated 1,3,5-triazines by fluorination with sodium fluoride in dipolar aprotic solvents.The process is characterized in that TCT or mixed chlorinated/fluorinated 1,3,5-triazines or mixtures thereof are metered into a suspension of sodium fluoride in a dipolar, aprotic solvent, which is warmed to a temperature of between 120.degree. C. and 220.degree. C. and optionally contains a further solvent.
Abstract:
Trichloroisocyanuric acid is produced by the reaction of a symmetrical triazine compound selected from the group consisting of ammelide, chlorosubstituted ammelide, ammeline and chlorosubstituted ammeline, with dichlorine monoxide in a gaseous mixture with a diluent gas. The gaseous mixture is comprised of from about 1 to about 30 percent by volume of dichlorine monoxide.
Abstract:
An improved process and apparatus for preparing cyanuric chloride by trimerizing cyanogen chloride in the presence of chlorine. The cyanogen chloride is produced by electrolytically reacting a solution of hydrogen cyanide or a salt thereof with chloride ion in an anode chamber of an electrolytic cell at a pH of less than 4.
Abstract:
A process for the production of cyanuric chloride by trimerizing cyanogen chloride in the vapor phase using an activated carbon catalyst obtained from coconut shell.
Abstract:
Method for utilization of melamine waste gas in high pressure liquid phase melamine synthesis using urea or urea-thermal decomposition product as initial material, - characterized by synthesizing urea under the melamine synthesis pressure directly from melamine waste gas obtained as by-product in the synthesis or, depending on the case, with water or aqueous ammonium carbonate solution added thereto, and introducing the obtained lower pressure urea synthesis solution into decomposing stage of main urea synthesis.
Abstract:
This invention provides a process for producing chloroisocyanuric acids by reacting cyanuric acid, sodium hypochlorite and chlorine at a temperature above zero* C. and preferably below 25* C., until the pH is between 1.7 and 3.5.