Method to adjust the elongation required to effect a color change in polymeric stretch films incorporating mechanochromic dyes
US11441013B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2019 |
| Grant date | Sep 13, 2022 |
| Priority date | — |
| Expiry date | Aug 24, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2553/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present disclosure relates a method to adjust the amount of elongation required to effect a color change in a polymer stretch film. A first aspect of the invention is a method which method comprises selecting a polyolefin resin having a given density; admixing a given amount of the AIE mechanochromic dye into a melt of the polyolefin resin; making a film of a desired thickness from the polyolefin resin containing the mechanochromic dye; determining the level of elongation needed to effect a color change in the resulting film; and adjusting the density of the polyolefin resin to change the level of elongation needed to effect the color change to the desired level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.