Laminate
AssigneesDaicel Corporation, Daikin Industries, Ltd.
InventorsNaotaka Nishio, Takema Nakazawa, Masaya Kasai
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Abstract
Provided is a laminate having low air permeability and excellent moisture permeability in a low temperature and low humidity environment. The laminate is provided with a porous substrate and a moisture-permeable membrane disposed on one side of the porous substrate, the laminate having an air resistance of 3000 seconds/100 cc or greater based on the Gurley method according to JIS P8117-2009 and a first moisture permeability of 300 g/(m2·24 h) or greater based on a moisture permeability testing method (the cup method) according to JIS Z0208-1976 under the conditions of a temperature of 5° C., a relative humidity of 45%, and a wind speed of 0.2 m/s or less.
Claims2
A laminate comprising a porous substrate and a moisture-permeable membrane disposed on one side of the porous substrate,
- wherein the laminate has an air resistance of 3000 seconds/100 cc or greater based on a Gurley method according to JIS P8117-2009, and a first moisture permeability of 300 g/(m2·24 h) or greater based on a moisture permeability testing method (a cup method) according to JIS Z0208-1976 under conditions of a temperature of 5° C., a relative humidity of 45%, and a wind speed of 0.2 m/s or less,
- wherein the moisture-permeable membrane comprises a resin with hydrophilic groups having cationic and anionic groups, and hydrophobic groups, wherein the hydrophilic groups comprise phosphorylcholine groups,
- wherein the porous substrate comprises a polyolefin-based resin,
- wherein the resin of the moisture-permeable membrane is a copolymer containing a constituent unit of Formula (2) below,
- wherein the constituent unit of Formula (2) comprises the hydrophobic groups,
- wherein the resin comprises a hydrophilic portion from said hydrophilic groups and a hydrophobic portion from said hydrophobic groups, and the hydrophilic portion and the hydrophobic portion are phase-separated, and
- wherein a thickness of the moisture-permeable membrane is from 50 to 500 nm:
- wherein in Formula (2), R5 represents a hydrogen atom or an alkyl group having from 1 to 4 carbons, and R6 represents a hydrocarbon group having 4 or more carbons.
Dependencies are inferred from the claim text.