Patent · US Active

Method for preparing a thermoplastic polyurethane of improved yellowness index, and optical articles made therefrom

US9169373B2 · kind B2 · utility

1Cited by

5References

11Claims

0Family size

Assignee

Essilor International (Compagnie Generale d'Optique) · FR

Inventors

Hao-Wen Chiu · Palm Harbor, US
Zeming Gou · Tampa, US

Key dates

Filing date	May 27, 2010
Grant date	Oct 27, 2015
Priority date	—
Expiry date	Aug 2, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/838
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Method for converting a composition into thermoplastic polyurethane, said composition comprising polyurethane resin, said method comprising the steps of combining the composition with a chemical compound, and converting said mixture into thermoplastic polyurethane, characterized in that said chemical compound is 1,4-Di(2,6-dibromo-4-methylphenylamino)anthracene-9,10-dione. Article obtained according to this method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.