Water-barrier laminate
AssigneeToyo Seikan Group Holdings, Ltd.
InventorsNaru Kawahara, Shunya Nangou, Kota Mori, Shinpei Okuyama
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Abstract
A water-barrier laminate having a water-trapping layer (1) in which a hygroscopic agent is dispersed, wherein a hygroscopic agent has such a hygroscopic property that the ratio (Ax/Ay) of a hygroscopic amount Ax at a relative humidity of 80% and a hygroscopic amount Ay at a relative humidity of 30% is not less than 3, and the water-trapping layer is positioned between the two inorganic barrier layers (3a) and (3b). The water-barrier laminate exhibits barrier property against the water over extended periods of time.
Claims3
A water-barrier laminate having a water-trapping layer in which a hygroscopic agent is dispersed, wherein a hygroscopic agent has such a hygroscopic property that the ratio (Ax/Ay) of a hygroscopic amount Ax at a relative humidity of 80% and a hygroscopic amount Ay at a relative humidity of 30% is not less than 3, the water-trapping layer is positioned between two inorganic barrier layers,
- the water-trapping layer has a dispersion structure in which the hygroscopic agent is dispersed in a matrix of a cationic polymer,
- the matrix of the cationic polymer has a water absorption of 20% or more in an atmosphere of a humidity of 80% RH and 30° C., and has a crosslinked structure provided by a crosslinking agent,
- the crosslinking agent is a silane compound represented by a formula (1):
- X—SiR1n(OR2)3-n (1)
- wherein X is an organic group having an epoxy group at the terminal, R1 and R2 are, respectively, methyl groups, ethyl groups or isopropyl groups, and n is 0, 1 or 2, and
- the hygroscopic agent is a crosslinked product of a monovalent metal salt of a poly(meth)acrylic acid and has an average primary grain size D50 not larger than 100 nm.
Dependencies are inferred from the claim text.