摘要:
The present invention relates to a core material for a vacuum insulation panel that is formed with a phenolic resin, a vacuum insulation panel using the core material, and a method for manufacturing the vacuum insulation panel. More particularly, the core material is formed with a cured phenolic resin foam having a closed cell content of 20% or less. The cured phenolic resin foam includes cells whose average diameter is adjusted to 50 to 500 μm. The cells have fine holes with an average diameter of 0.5 to 30 μm on the surfaces thereof to allow the cured phenolic resin foam to have a void content of at least 50%. The use of the cured phenolic resin foam ensures high thermal insulation performance and improved structural strength of the core material, and enables the production of the core material at reduced cost.
摘要:
Disclosed is an optical film that is manufactured by using longitudinal and uniaxial stretching of an unstretched cycloolefin copolymer film and has an in-plane retardation of 100 to 150 nm and a thickness retardation of 0 to −30 nm at a wavelength of 550 nm, a polarizing plate and a liquid crystal display including the same, and a method of manufacturing the optical film. The method includes longitudinally and uniaxially stretching the unstretched film while a ratio of a width to a length of a stretched portion of the film is controlled.