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DuPont Electronic Polymers L.P. Patents |
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Assignee: DuPont Electronic Polymers L.P.
Address: Research Triangle Park, NC
No. of patents: 3
Patents:
| Patent Number |
Title Of Patent |
Date Issued |
| 7371800 |
Derivatized novolak polyhydroxystyrene from hydroxyphenylmethylcarbinol |
May 13, 2008 |
| A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a suffi |
| 7312281 |
Anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity |
December 25, 2007 |
| An anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity comprising the steps of polymerization, purification, transesterification, purification, catalyst removal, and solvent exchange. The resultant polymer in solution can be used directly, wi |
| 7148320 |
Polymer purification |
December 12, 2006 |
| Polymers derived from various monomers are purified by fractionalization of the crude polymers in a solvent/non solvent system via reverse precipitation. |
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