Title:
OUTSTANDINGLY DURABLE AND HEAT-RESISTANT POLARISING ELEMENT, POLARISING PLATE AND IMAGE-DISPLAY DEVICE, AND POLARISING-ELEMENT PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2010/087653
Kind Code:
A2
Abstract:
The present invention relates to an outstandingly durable and more particularly heat-resistant polarising element, polarising plate and image-display device in which the zinc, boron and potassium contents are controlled within a specific range, and to a production method for the polarising element. In one embodiment, the present invention provides a polarising element in which, based on the weight of the polarising element, the value of zinc content (wt.%) x boron content (wt.%)/potassium content (wt.%) is from 0.1 to 4.0, and the boron content is from 1.0 to 5.0 wt.% and the potassium content is from 0.3 to 2.0 wt.%, and provides a polarising plate and an image-display device comprising the same. Further, the invention provides a production method for a polarising element at least comprising the steps of dyeing, crosslinking and washing, in which: in the dyeing step, a poly(vinyl alcohol) based film is immersed for between 150 and 300 seconds in an aqueous dyeing solution having an iodine concentration of from 0.05 to 0.2 wt.%, a potassium iodide concentration of from 0.2 to 1.5 wt.% and a temperature of from 20 to 40°C; in the crosslinking step, the poly(vinyl alcohol) based film is immersed for between 30 and 120 seconds in an aqueous crosslinking solution having a boron concentration of from 0.36 to 0.83 wt.%, a potassium iodide concentration of from 4 to 7 wt.% and a temperature of from 15 to 60°C; at least one type of zinc salt selected from the group comprising zinc chloride, zinc iodide, zinc sulphate, zinc nitrate and zinc acetate is included, at a concentration of from 0.4 to 7.0 wt.% in at least one aqueous solution constituted by either the aqueous dyeing solution or the aqueous crosslinking solution or another zinc-salt aqueous processing solution; and, in the washing step, the poly(vinyl alcohol) based film is immersed for between 10 and 30 seconds in pure water at a temperature of from 25 to 30°C. The polarising element, polarising plate and image-display device of one embodiment of the present invention exhibit outstanding durability and heat-resistance in that they maintain their initial orthogonal transmittance and colour tone, and they maintain their transmittance, degree of polarisation and colour tone even under high-temperature conditions.
Inventors:
KWON, Ki-Ok (#832 Honorsville, Dunsan-dong Seo-gu, Daejeon 302-120, 302-120, KR)
권기옥 (대전광역시 서구 둔산동 아너스빌 832호, 302-120 Daejeon, 302-120, KR)
KIM, Seung-Ae (3-324 LG Dormitory, 386-1 Doryong-dong Yuseong-gu, Daejeon 305-340, 305-340, KR)
권기옥 (대전광역시 서구 둔산동 아너스빌 832호, 302-120 Daejeon, 302-120, KR)
KIM, Seung-Ae (3-324 LG Dormitory, 386-1 Doryong-dong Yuseong-gu, Daejeon 305-340, 305-340, KR)
Application Number:
KR2010/000570
Publication Date:
August 05, 2010
Filing Date:
January 29, 2010
Export Citation:
Assignee:
LG CHEM, LTD. (20 Yeouido-dong, Yeoungdeungpo-gu, Seoul 150-875, 150-875, KR)
주식회사 엘지화학 (서울시 영등포구 여의도동 20, 150-875 Seoul, 150-875, KR)
KWON, Ki-Ok (#832 Honorsville, Dunsan-dong Seo-gu, Daejeon 302-120, 302-120, KR)
권기옥 (대전광역시 서구 둔산동 아너스빌 832호, 302-120 Daejeon, 302-120, KR)
주식회사 엘지화학 (서울시 영등포구 여의도동 20, 150-875 Seoul, 150-875, KR)
KWON, Ki-Ok (#832 Honorsville, Dunsan-dong Seo-gu, Daejeon 302-120, 302-120, KR)
권기옥 (대전광역시 서구 둔산동 아너스빌 832호, 302-120 Daejeon, 302-120, KR)
International Classes:
G02B5/30; G02F1/1335; H01J17/49
Attorney, Agent or Firm:
C&S LOGOS PATENT AND LAW OFFICE (13th Floor, Seocho-Pyunghwa Building1451-34 Seocho-dong, Seocho-gu, Seoul 137-070, 137-070, KR)
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