Monoalkyl tin trialkoxides and/or monoalkyl tin triamides with particulate contamination and corresponding methods
US11498934B2 · kind B2 · utility
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Key dates
| Filing date | Jan 30, 2019 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | May 4, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/2004
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The purification of monoalkyl tin trialkoxides and monoalkyl tin triamides are described using fractional distillation and/or ultrafiltration. The purified compositions are useful as radiation sensitive patterning compositions or precursors thereof. The fractional distillation process has been found to be effective for the removal of metal impurities down to very low levels. The ultrafiltration processes have been found to be effective at removal of fine particulates. Commercially practical processing techniques are described.
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