Aldehyde emission reduction for dibenzylidene sorbitol clarified plastics
US6518339B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2000 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Sep 18, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An additive that is used in conjunction with certain dibenzylidene sorbitol-type (DBS) clarifiers and acid scavengers within polyolefin resins to reduce the release of aldehydes from polypropylene material is disclosed. Hydrazides have been shown to be effective at removing residual aldehyde from polyolefins, such as polypropylene. This function can be accomplished with a minimal impact on optical transparent properties imparted to the polypropylene by the clarifying agent. The net effect is an improvement in the organoleptic performance of resins containing clarifiers, and a reduction in the UV-absorbing extractables. Particularly, adipic dihydrazide, when co-compounded into polypropylene homopolymer with 4-methyl DBS, improves the organoleptic performance of the clarifier. Incorporation of dihydrazides into polypropylene pellets reduced air-released aldehyde by nearly 100%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.