Methods for improving the base color of plastic by reducing biological growth in the latex system
US10421826B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2016 |
| Grant date | Sep 24, 2019 |
| Priority date | — |
| Expiry date | Jun 14, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/3492
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for providing a resin having minimal discoloration comprises combining, in a reactor or a reactor vessel, monomers, an emulsifier or surfactant, and an initiator in solution to form a polymeric latex; directing the polymeric latex into a storage system comprising a storage vessel; maintaining the latex in the storage vessel for an aging time and ensuring that the polymeric latex exhibits less than 1000 CFU/ml of biological growth according to ASTM D 5465-93 (2012) upon completion of the aging time; and coagulating the polymeric latex, wherein the polymeric latex is exposed to a mixture of water and a coagulant and filtered to provide a resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.