Method of polyarylene sulfide precipitation
AssigneeTicona LLC
InventorHendrich A. Chiong
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Abstract
A method for forming a polyarylene sulfide is described. The method can include a multi-step cooling and precipitation process in which the cooling rate of the solution that carries the polymer is decreased during a portion of the overall cooling. This slower cooling period can encompass at least a portion of the period during which the polymer precipitates from the solution. The precipitation process can form polyarylene sulfide particles with good particle integrity and a narrow particle size distribution, which can reduce fines and improve downstream processing and final product characteristics.
Claims16
Precipitated polyphenylene sulfide particles having a bulk density of greater than 0.5 grams per cubic centimeter to about 1.5 grams per cubic centimeter, a d50 particle size of from about 800 micrometers to about 2,000 micrometers, wherein the particles have a pore area of from about 35 square meters per gram to about 74 square meters per gram, and wherein the particles are formed by cooling a polyphenylene sulfide in a precipitation solution in a multi-step cooling process that includes a first cooling step, second cooling step, and third cooling step, wherein the second cooling step is conducted at a slower cooling rate than the first step and the third cooling step is conducted at a faster cooling rate than the second cooling step.
A polymer component formed from a plurality of precipitated polyphenylene sulfide particles having a bulk density of greater than 0.5 grams per cubic centimeter to about 1.5 grams per cubic centimeter, a d50 particle size of from about 800 micrometers to about 2,000 micrometers, and a pore area of from about 35 square meters per gram to about 74 square meters per gram.
Dependencies are inferred from the claim text.