Process of melt-spinning high-molecular-weight ethylene terephthalate polymer专利检索-制作人造长丝或类似物的一般方法专利检索查询-专利查询网

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Process of melt-spinning high-molecular-weight ethylene terephthalate polymer
申请号	US3627867D	申请日	1968-09-05	公开(公告)号	US3627867A	公开(公告)日	1971-12-14
申请人	DU PONT;			发明人	SCHWARZ ECKHARD CHRISTIAN AUGU;
摘要	A process and apparatus are disclosed for melt-spinning highmolecular-weight polyethylene terephthalate into high-performance fibers under conditions which reduce the normally high viscosity of such polyester. Ethylene oxide or other low-boiling oxirane compound is injected under pressure into molten polyester before it is fed to the metering pump of the melt-spinning machine. Illustrations show that injection of amounts as small as 0.3 percent provide a substantial reduction in filter pack pressure. The fibers are characterized by low free-carboxyl content and freedom from voids which might be expected from injection of the volatile material.
权利要求	2. The process defined in claim 1 wherein the oxirane compound is added to the polymer 5 to 20 minutes before the polymer reaches the metering pump at the spinning operation. 3. The process defined in claim 1 wherein the amount of oxirane compound added to the polymer is from 0.3 percent to 10 percent by weight based on the weight of polymer. 4. The process defined in claim 1 wherein the ethylene terephthalate polymer has a relative viscosity of at least 50 when determined as a 10 percent solution in a mixture of 10 parts phenol and 7 parts 2,4,6-trichlorophenol by weight at 25* C. 5. The process defined in claim 2 wherein said oxirane compound is ethylene oxide.
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