To provide a method for evaluating the birefringence of a novel adhesive, a method for designing and a method for producing an adhesive using the evaluation method, and to provide the adhesive obtained by the production method, and a polarizing plate and a liquid crystal display device using the obtained adhesive, and to provide a method for manufacturing the polarizing plate and the liquid crystal display device.
The method for evaluating the birefringence of an adhesive includes the steps of: preparing a laminate film comprising a polymer film as a support having an absolute intrinsic birefringence of 1×10-3 or less and an absolute photoelastic coefficient of 1×10-12 Pa-1 or less and an adhesive applied on the support; thermally stretching the laminate film; and measuring the retardation of the laminate film after thermally stretched and the thickness of the adhesive layer.
TAKAYA AKIHIRO
ODA SUMIHISA
NAGAKURA TAKESHI
SAIDEN CHEMICAL IND CO LTD
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TAGAYA A , ET.AL.: "Zero-Birefringence Optical Polymers", MACROMOLECULES, vol. 39, JPN6011042583, 18 April 2006 (2006-04-18), pages 3019 - 3023, ISSN: 0003037233