Polymer scale preventive process using a coating of chitosan salt and phenothiazine
US5486582A · kind A · utility
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6Claims
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Key dates
| Filing date | Dec 15, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Dec 15, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/004
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polymer scale preventive process for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising (A) a water-soluble basic polysaccharide and (B) a phenothiazine. The process is used for forming a coating on the inner wall, etc. of a polymerization vessel, and highly safe for operators. Deposition of polymer scale can be effectively prevented, and polymeric product with high whiteness or a low initial coloration is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.