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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11643477 B1

PDFFull Text
Date of Patent:
May. 09, 2023

Filed:

May. 04, 2021

Regioselectively substituted cellulose esters and films made therefrom

Applicant:

Eastman Chemical Company, Kingsport, TN (US);

Inventors:

Matthew Allen Boone, Kingsport, TN (US);

Christopher Harlan Burk, Gray, TN (US);

Peter Borden Mackenzie, Vancouver, CA;

Jennifer A. Fish, Mount Joy, PA (US);

Eduardo Gallas Cervo, Kingsport, TN (US);

Elaine Beatrice Mackenzie, Vancouver, CA;

Robert Joseph Maleski, Kingsport, TN (US);

Wesley Wayne McConnell, Kingsport, TN (US);

David William Norman, Kingsport, TN (US);

Tabatha Stearns, Kingsport, TN (US);

Bin Wang, Kingsport, TN (US);

Assignee:

Eastman Chemical Company, Kingsport, TN (US);

Attorney:

Kennrick L. Vidale

Primary Examiner:

Eli D Strah

Int. Cl.
CPC ...
C08B 3/16 (2006.01); B32B 27/24 (2006.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); B32B 7/12 (2006.01); B32B 27/28 (2006.01); C08L 1/14 (2006.01); B32B 23/08 (2006.01); B32B 27/32 (2006.01); B32B 27/18 (2006.01); G02B 5/30 (2006.01); B32B 27/22 (2006.01); B32B 27/06 (2006.01); G02F 1/13363 (2006.01); H01L 51/52 (2006.01); C08L 1/08 (2006.01); C08L 1/10 (2006.01);
U.S. Cl.
CPC ...
C08B 3/16 (2013.01); B32B 7/12 (2013.01); B32B 23/08 (2013.01); B32B 27/06 (2013.01); B32B 27/08 (2013.01); B32B 27/18 (2013.01); B32B 27/22 (2013.01); B32B 27/24 (2013.01); B32B 27/281 (2013.01); B32B 27/325 (2013.01); B32B 27/36 (2013.01); B32B 27/365 (2013.01); C08L 1/14 (2013.01); G02B 5/305 (2013.01); G02B 5/3033 (2013.01); G02B 5/3083 (2013.01); G02F 1/13363 (2013.01); H01L 51/5259 (2013.01); H01L 51/5281 (2013.01); B32B 2307/40 (2013.01); B32B 2307/516 (2013.01); B32B 2307/518 (2013.01); B32B 2307/546 (2013.01); B32B 2307/732 (2013.01); B32B 2309/105 (2013.01); B32B 2457/202 (2013.01); B32B 2457/206 (2013.01); C08L 1/08 (2013.01); C08L 1/10 (2013.01); C09K 2323/03 (2020.08); C09K 2323/035 (2020.08); G02F 1/133638 (2021.01); G02F 2413/13 (2013.01);
Abstract

Regioselectively substituted cellulose esters having a plurality of pivaloyl substituents and a plurality of aryl-acyl substituents are disclosed along with methods for making the same. Such cellulose esters may be suitable for use in films, such as +A optical films, and/or +C optical films. Optical films prepared employing such cellulose esters have a variety of commercial applications, such as, for example, as compensation films in liquid crystal displays and/or waveplates in creating circular polarized light used in 3-D technology.

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