US Patent No: 6,486,281
Number of patents in Portfolio can not be more than 2000
Process for preparing high-purity vinylpyrrolidone polymer
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Nov 26, 2002
Issued date -
Aug 24, 2001
filing date -
09/914,267
serial no -
Expired
status
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Abstract
A process for preparing a high purity vinylpyrrolidone polymer which dissolves clearly in an organic solvent can be provided. The process for preparing a high purity vinylpyrrolidone polymer, wherein vinylpyrrolidone is polymerized by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter the product is contacted with an anion exchange resin to be purified.
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,354,945 Preparation of ultrapure N-vinylpyrrolidone polymers | 10 | 1992 | |
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| 5,286,844 Method of purifying polyacrylonitrile | 5 | 1992 | |
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| 5,922,777 Coating compositions containing ion exchange resins | 7 | 1997 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
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| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 26, 2014 |
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