摘要:
IN A PROCESS FOR POLYMERIZING TETRAOXANE, SULFUR OR AN ORGANIC SULFUR COMPOUND WHICH IS ADMIXED TO TETRAOXANE ACTS IS POLYMERIZATION INITIATOR FOR TETRAOXANE. SOME OF THE ORGANIC SULFUR COMPOUNDS, SUCH AS THIIRANES, THIOCYAMATES AND THRTHIANOXIDES, IMPROVE HEAT STABILITY OF THE PRODUCED POLYOXYMETHYLENE REMARKABLY.
摘要:
Pure and high molecular weight polyoxymethylene can be efficiently and economically produced in good yield by the polymerization of tetraoxane using a radical-forming material such as a peroxide, some nitrogen-containing compounds, a gaseous mixture containing ozone, an aqueous or organic solvent solution of hydrogen peroxide, and the like without requiring the coexistence of any known initiators for cationic polymerization.
摘要:
Tetraoxane is polymerized by means of an electron acceptor substance used as polymerization initiator in the absence or presence of a saturated aliphatic carboxylic acid anhydride and/or an acetal, to obtain an oxymethylene polymer having thermal stability. An ionizing radiation or a light can, if desired, concomitantly be employed before and/or in the course of polymerization.
摘要:
IODINE OR BROMINE IS ADVANTAGEOUSLY EMPLOYED AS AN INITIATOR IN THE POLYMERIZATION OF TETRAOXANE. THE POLMERIZATION YIELD IS INCREASED WHEN A HALOGENOHYDROCARBON IS USED AS AN INITIATOR IN ADDITION TO IODINE OR BROMINE. AN OXYMETHYLENE POLYMER HAVING EXCELLENT HEAT-STABILITY IS OBTAINED BY ADDING AN ACETAL OR ACETAL TO THE POLYMERIZATION SYSTEM. ALSO, THE POLYMERIZATION IS FURTHER PROMOTED BY MEANS OF AN IONIZING RADIATION OR AN ULTRAVIOLET LIGHT.
摘要:
Tetraoxane is polymerized in the presence of alkyl acetal, represented by the general formula: (WHEREIN R1 and R3 are each an aliphatic hydrocarbon residue, having one to four carbon atoms; and R2 and R4 are each hydrogen or an aliphatic hydrocarbon residue, having one to three carbon atoms) to form polyoxymethylene. The polyoxymethylene so made has superior thermal stability and excellent strength and is obtained at a high yield in one step.
摘要:
A THERMALLY STABILIZED OXYMETHYLENE POLYMER IS OBTAINED BY POLYMERIZING TETRAOXANE IN THE PRESENCE OF AN ACETAL AND A POLYMERIZATION INITATOR SELECTED FROM THE GROUP CONSISTING OF SULFUR AND AN ORGANIC SULFUR COMPOUND. IRRADIATION BY AN IONIZING RADIATION OF AN ACTINIC LIGHT CAN ADVANTAGEOUSLY BE EMPLOYED IN THE POLYMERIZATION. SAID THERMAL STABILITY IS FURTHER IMPROVED, WHEN TETRAOXANE IS POLYMERIZED BY USING A SPECIFIC COMBINATION OF AN ACETAL SUCH AS METHYLAL, ETHYLAL, 1,3-DIOXOLANE, 1,3DIOXANE, ETC. AND AN INITIATOR SUCH AS THIIRANES, THIOCYANATES, ISOTHIOCYANATES, ETHYLENETHIOUREA, TRITHIANOXIDES, ECT.