CPC B65D 65/40 (2013.01) [B32B 1/00 (2013.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/16 (2013.01); B32B 27/32 (2013.01); B32B 27/36 (2013.01); B65D 81/266 (2013.01); B32B 2255/08 (2013.01); B32B 2255/20 (2013.01); B32B 2255/26 (2013.01); B32B 2307/518 (2013.01); B32B 2307/7242 (2013.01); B32B 2439/00 (2013.01)] | 7 Claims |
1. A gas barrier laminate used for a packaging body for retort treatment or boiling treatment, comprising:
a resin substrate;
a first layer which is located on the resin substrate, and includes an inorganic oxide;
a second layer which is located on the first layer, and includes a carboxylic acid polymer;
a third layer which is located on the second layer, and includes a polyvalent metal compound and a resin; wherein
a thickness of the third layer is 0.1 μm to 0.5 μm,
a ratio between the thickness of the third layer and a thickness of the second layer is 1.0 to 5; and
when 150 mL of a 0.3 mass % cysteine aqueous solution is accommodated in a packaging body constituted by the gas barrier laminate and having an inner area of 400 cm2, and after the packaging body is subjected to heat treatment with water vapor at 125° C. for 30 minutes, a sulfur content of the second layer is 1.0 atm % or less; and wherein
the polyvalent metal compound is zinc oxide, and
a content of the zinc oxide relative to a mass of the third layer is 65 mass % or more and 85 mass % or less.
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