Gas barrier laminate and method of producing the same

摘要

A gas barrier laminate having an undercoating (A) which comprises a main resin, an isocyanate type curing agent and an alkaline compound of a polyvalent metal; and a barrier layer (B) of a polycarboxylic acid polymer forming an ionic crosslinking due to the polyvalent metal among the carboxyl groups; formed on at least one surface of a plastic base material (P), wherein a region (b) free of the alkaline compound of the polyvalent metal is formed in the undercoating (A) on the side of the barrier layer (B), the content of nitrogen in the region (b) being larger than the content of nitrogen in the undercoating (A) other than the region (b), the gas barrier laminate having excellent gas barrier property, retort resistance, producibility as well as excellent flexibility without developing interlayer peeling even if it is folded and featuring excellent interlayer adhesion.

主权项

1. A gas barrier laminate having:
an undercoating (A) which comprises a main resin, an isocyanate curing agent and an alkaline compound of a polyvalent metal; and a barrier layer (B) of a polycarboxylic acid polymer in which an ionic crosslinking is formed due to the polyvalent metal among the carboxyl groups;which are formed on at least one surface of a plastic base material,
wherein said main resin is a polyester polyol, and said isocyanate curing agent is a combination of a straight chain aliphatic isocyanate compound and an alicyclic isocyanate compound having an alicyclic ring structure in the skeleton thereof or an isocyanate compound having an aromatic ring, and wherein a layer (b) free of the alkaline compound of the polyvalent metal is formed in said undercoating (A) on the side of the barrier layer (B), the content of nitrogen in said layer (b) being larger than the content of nitrogen in said undercoating (A) other than the layer (b).