IP Library Granted Patent US 12,204,198
Granted Patent B2
US 12,204,198 · App. 17/609,635 · Granted Jan 21, 2025

Polarizing plate laminate and method for preparing same

Inventors: Do Hyun Kim (Daejeon, KR); Sung Wook Jeon (Daejeon, KR); Dae Hee Lee (Daejeon, KR); Seung Kyu Park (Daejeon, KR); Youngjin Kim (Daejeon, KR)
Assignee: LG Chem, Ltd.
G02F1/133528B32B7/023B32B7/06B32B7/12B32B27/365B32B37/003B32B37/12B32B2037/268B32B2250/03B32B2250/04B32B2307/42B32B2307/732B32B2457/202
View Patent ↗
Loading inventors, assignments & file history…
Monitor This Case
Get email alerts when status or documents change.
Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 12,204,198
App. No.
17/609,635
Granted
Jan 21, 2025
Kind
B2
Abstract

A polarizing plate laminate according to an exemplary embodiment of the present disclosure includes: a polarizing plate; a first adhesive layer and a first separate film which are provided on one surface of the polarizing plate; and a second adhesive layer and a second separate film which are provided on the other surface of the polarizing plate, in which the second separate film has a total thickness of more than 75 μm and 150 μm or less.

Claims (20)

1. A polarizing plate laminate comprising:

a polarizing plate;

a first adhesive layer and a first separate film which are provided on one surface of the polarizing plate; and

a second adhesive layer and a second separate film which are provided on the other surface of the polarizing plate,

wherein the second separate film has a double-layered structure and has a total thickness of more than 75 μm and 150 μm or less.

2. The polarizing plate laminate of claim 1 , wherein the first separate film has a thickness of 10 μm to 75 μm.

3. The polarizing plate laminate of claim 1 , wherein each of the first separate film and the second separate film comprises one or more resins selected from the group consisting of a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin and a polycarbonate-based resin.

4. The polarizing plate laminate of claim 1 , wherein a region where the second separate film is provided on the polarizing plate is a region where a liquid crystal panel or an optical film of a liquid crystal display device is disposed.

5. A method for manufacturing a polarizing plate laminate, the method comprising:

applying a first adhesive layer to one surface of a polarizing plate and applying a second adhesive layer to the other surface of the polarizing plate; and

laminating a first separate film on the first adhesive layer and laminating a second separate film on the second adhesive layer,

wherein the second separate film has a double-layered structure and has a total thickness of more than 75 μm and 150 μm or less.

6. The method of claim 5 , wherein the first separate film has a thickness of 10 μm to 75 μm.

7. The method of claim 5 , wherein each of the first separate film and the second separate film comprises one or more resins selected from the group consisting of a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin and a polycarbonate-based resin.

8. The method of claim 5 , wherein the laminating of the first separate film and the laminating of the second separate film are performed by a roll to roll process.

9. A method for manufacturing a liquid crystal display device, the method comprising:

removing the first separate film from the polarizing plate laminate of claim 1 ; and

attaching a liquid crystal panel or an optical film of a liquid crystal display device to the polarizing plate, such that a surface of the polarizing plate laminate from which the first separate film is removed is bonded to one surface of the liquid crystal panel or the optical film.

10. The method of claim 9 , wherein the optical film comprises one or more films selected from the group consisting of an antiglare film, a hard coating film, an anti-reflection film, and an Anti-Glare & Low-Reflection (AGLR) film.

11. The method of claim 9 , wherein the optical film is a polycarbonate film.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 26, 2025
From: LG CHEM LTD.
To: SHANJIN OPTOELECTRONICS (SUZHOU) CO., LTD.
Reel/Frame 070629/0273 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 8, 2021
From: KIM, DO HYUN; JEON, SUNG WOOK; LEE, DAE HEE; PARK, SEUNG KYU; KIM, YOUNGJIN
To: LG CHEM, LTD.
Reel/Frame 058048/0980 →
Priority Claims (1)
KR 10-2019-0137106 · Oct 31, 2019 · national
Continuity (1)
Related Publication 20220229330A1 · Jul 21, 2022
References Cited (45)
US 9841545B2 · Mizutani et al. · 2017 [cited by applicant]
US 20020015807A1 · Sugino et al. · 2002 [cited by applicant]
US 20070195244A1 · Miyatake et al. · 2007 [cited by applicant]
US 20080278690A1 · Maeda et al. · 2008 [cited by applicant]
US 20090122401A1 · Shinagawa et al. · 2009 [cited by applicant]
US 20120206804A1 · Nam et al. · 2012 [cited by applicant]
US 20130170035A1 · Jung et al. · 2013 [cited by applicant]
US 20130258481A1 · Fukuda et al. · 2013 [cited by applicant]
US 20140085722A1 · Yasui et al. · 2014 [cited by applicant]
US 20150346408A1 · Mizutani · 2015 [cited by examiner]
US 20160209566A1 · Yasui · 2016 [cited by examiner]
US 20200393603A1 · Lee et al. · 2020 [cited by applicant]
CN 101907737A · 2010 [cited by applicant]
CN 103969732A · 2014 [cited by applicant]
CN 106324741A · 2017 [cited by applicant]
CN 107635764A · 2018 [cited by applicant]
JP 1044284A · 1998 [cited by applicant]
JP 2001108826A · 2001 [cited by applicant]
JP 2001305348A · 2001 [cited by applicant]
JP 2009075476A · 2009 [cited by applicant]
JP 2009120711A · 2009 [cited by applicant]
JP 2013228720A · 2013 [cited by applicant]
JP 2014122984A · 2014 [cited by applicant]
JP 2014126598A · 2014 [cited by applicant]
JP 2016035046 · 2016 [cited by applicant]
JP 201680830A · 2016 [cited by applicant]
JP 2016118776A · 2016 [cited by applicant]
JP 2016136238A · 2016 [cited by applicant]
JP 2018022135 · 2018 [cited by applicant]
KR 100679535B1 · 2007 [cited by applicant]
KR 1020090101763A · 2009 [cited by applicant]
KR 1020110002676A · 2011 [cited by applicant]
KR 1020130077702A · 2013 [cited by applicant]
KR 20150048220A · 2015 [cited by applicant]
KR 20150050063A · 2015 [cited by applicant]
KR 1020150120264A · 2015 [cited by applicant]
KR 1020160074399A · 2016 [cited by applicant]
KR 1020170054403A · 2017 [cited by applicant]
KR 101864095B1 · 2018 [cited by applicant]
KR 10201800118239A · 2018 [cited by applicant]
KR 20190072151A · 2019 [cited by applicant]
TW 200717031A · 2007 [cited by applicant]
TW 200922979A · 2009 [cited by applicant]
WO 2017057223A1 · 2017 [cited by applicant]
WO 2017104463A1 · 2017 [cited by applicant]