| 摘要 |
PROBLEM TO BE SOLVED: To provide a flexible membrane material scattering light in a near infrared region, especially excellent in heat insulation to solar radiation, excellent in daylighting by transmission of light in a visible light region and capable of coloring. ! SOLUTION: There is provided a heat insulation membrane material which is a flexible sheet 1 having at least a layer of a near infrared ray shielding layer 2, which contains a matrix resin consisting of a soft vinyl chloride resin composition and, as a heat insulator 3, titanium oxide particle 3-1 having an average particle diameter of 0.5 to 2.0 μm and barium sulfate particle 3-2 having the average particle diameter of 0.3 to 1.2 μm dispersed in the matrix resin at 5 to 25 mass% where a mass ratio of the titanium oxide particle and the barium sulfate particle is 1: 1 to 1: 5 in the heat insulator 3 and the titanium oxide particle and the barium sulfate particle are surface coated by one or more of an inorganic material selected from silica, |
