Laminate structure

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/12 (2006.01) A41D 31/00 (2006.01) A41D 31/02 (2006.01)

Patent

CA 2384316

A substantially liquid impermeable moisture vapor permeable laminate structure comprising: (i) a substrate layer (5) comprising a woven or non-woven material, (ii) a moisture vapor control layer (13) attached to said substrate, (iii) a tie layer (6) comprising one or more copolymers comprising from about 30 to about 90 weight percent ethylene co-monomer units and from about 10 to about 70 weight percent vinyl acetage co-monomer units, and (iv) a layer (7) comprising one or more copolyetherester(s) in an amount of at least 50 weight percent based on the total amount of polymer in the layer. The moisture vapor transmission rate (MVTR) in the direction away fromthe copolyetherester- containing layer (7) and tie layer (6) and towards the substrate (5) is preferably greater than the MVTR in the direction away from the substrate layer (5) and towards the tie layer (6) and copolyetherester-containing layer (7).

L'invention concerne une structure stratifiée sensiblement imperméable aux liquides et perméable à la vapeur d'eau, qui comporte : (1) une couche de substrat contenant une matière tissée ou non tissée ; (2) une couche de régulation de vapeur d'eau fixée audit substrat ; (3) une couche de liaison contenant un ou plusieurs copolymères qui comprennent d'environ 30 à environ 90 % en poids d'unités de comonomères d'éthylène, et d'environ 10 à environ 70 % en poids d'unités de comonomères d'acétate de vinyle ; et (4) une couche contenant un ou plusieurs copolyétherester(s) selon une proportion d'au moins 50 % en poids de la quantité totale de polymère de la couche. Le taux de transmission de vapeur d'eau (MVTR) sortant de la couche contenant le(s) copolyétherester(s) et de la couche de liaison en direction du substrat est de préférence supérieur au MVTR sortant de la couche de substrat en direction de la couche de liaison et de la couche contenant le(s) copolyétherester(s).

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