Method for the preparation of nitrated styrenic fluoropolymers

US10556973B2 · kind B2 · utility

Assignee

• Akron Polymer Systems, Inc. · US

Inventors

• Lang Hu · Akron, US
• Liu Deng · Kingsport, US
• Wentao Li · Kingsport, US
• Robert Jacks Sharpe
• Eduardo Gallas Cervo · Kingsport, US
• Thauming Kuo · Kingsport, US
• Bin Wang · Beijing, CN
• Alan Phillips · Roanoke, US
• Xiaoliang Zheng · Hudson, US
• Peiyao Wang · Akron, US
• Dong Zhang · Uniontown, US
• Frank W. Harris · Akron, US
• Ted Calvin Germroth · Kingsport, US

Key dates

• Filing date: Aug 11, 2017
• Grant date: Feb 11, 2020
• Expiry date: Nov 3, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a process for making nitrated styrenic fluoropolymers having various degrees of substitution. The nitrated styrenic fluoropolymer is capable of providing an exceptionally high birefringence ranging from 0.02 to 0.036. Further, the birefringence can be tuned by varying the degree of substitution (DS) of the nitro group on the styrenic ring to meet the need for optical compensation film applications. More particularly, the optical compensation films of the present invention are for use in an in-plane switching LCD (IPS-LCD) and OLED display.