Clarity, low haze polymer
US7452919B2 · kind B2 · utility
0Cited by
5References
20Claims
0Family size
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Key dates
| Filing date | May 27, 2004 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Aug 12, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing an improved clarity, low haze, low melt flow rate homopolymer polypropylene and thermoformed parts therefrom using an additive package such that the additive package alone provides the improved qualities, and process adjustments at the thermoforming stage are not required. The additive package does not contain a phosphite antioxidant, and the homopolymer polypropylene is either virgin material or virgin material mixed with at least 25 percent reground homopolymer polypropylene of the improved formulation described herein and combined with the improved clarity additive package.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.