Method for separating at least one selected polymer from a mixture of polymers
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United States of America Patent
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Issued Date -
Jun 17, 2004
app pub date -
Jan 9, 2004
filing date -
Dec 15, 2000
priority date (Note) -
Abandoned
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Abstract
The present invention provides a method for separating one or more selected polymer(s) from a mixture of polymers, as well as the recycled solid polymer product produced by the present method of the invention. One method of the present invention involves dissolving a mixture of polymers in a solvent to produce a solution, then cooling the solution to a temperature at which at least one of the selected polymers precipitates in the form of a solid. The solid is then separated from the suspension before being washed in a solvent at a temperature that is higher than the dissolving temperature, in order to produce a washed solid. The washed solid is separated from the second solvent. In one variant of the method, the suspension produced in the cooling step is treated with an added solvent.
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