Anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity
US7312281B2 · kind B2 · utility
4Cited by
1References
36Claims
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Key dates
| Filing date | Feb 24, 2005 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Feb 24, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2800/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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, without further processing steps, to prepare a photoresist composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.