초록 ▼

Hermetically sealed articles are provided which enclose a porous mass of material of relatively low heat conductivity and a charge of a gas having a coefficient of thermal conductivity lower than that of air and thoroughly permeating the porous mass of material or such sealed pouches may enclose onl

Hermetically sealed articles are provided which enclose a porous mass of material of relatively low heat conductivity and a charge of a gas having a coefficient of thermal conductivity lower than that of air and thoroughly permeating the porous mass of material or such sealed pouches may enclose only the porous mass of material evacuated down to about 10 mm. Hg. The pouches are useful as thermal insulation materials and are constructed of confronting sheets of multi-ply laminate material sealed along free edge portions thereof and comprising (1) a multi-layer film including a core layer of ethylene vinyl alcohol copolymer adhered on each side to nylon, each nylon layer being adhered to a layer of chemically modified polyolefin; (2) optionally, a low density polyethylene layer; (3) a layer of primer material suitable to effect adhesion between said modified polyolefin layer or polyethylene layer and the outer layer of oriented polypropylene or other material suitable for conveying toughness, flex crack resistance and moisture barrier properties to such multi-ply laminar construction. The articles are useful as thermal insulation materials.

대표청구항 ▼

A multi-ply laminate comprising: (1) a multi-layer coextruded film consisting essentially of (a) a core layer of ethylene vinyl alcohol adhered on each side to (b) a polyamide layer, each such polyamide layer being adhered to (c) a layer of a modified polyolefin which consists of a polyolefin polyme

A multi-ply laminate comprising: (1) a multi-layer coextruded film consisting essentially of (a) a core layer of ethylene vinyl alcohol adhered on each side to (b) a polyamide layer, each such polyamide layer being adhered to (c) a layer of a modified polyolefin which consists of a polyolefin polymer or copolymer blended with polyethylene grafted with an unsaturated fused ring carboxylic acid anhydride; (2) a layer of primer material effective to enhance adhesion between said modified polyolefin layer; and (3) an adjacent outer layer of a plastic material capable of conveying toughness and moisture barrier properties to said laminate. A multi-ply laminate comprising: (1) a five-layer coextruded cast film of about 1.5 to 5 mils in thickness consisting essentially of a core layer of ethylene-vinyl alcohol comprising about 10% of the film thickness adhered on each side to nylon comprising about 5% of the film thickness, each nylon layer being adhered to a layer of modified polyolefin comprising ethylene vinyl acetate blended with high density polyethylene grafted with an unsaturated fused ring carboxylic acid anhydride, each of said modified polyolefin layers comprising about 40% of the film thickness; (2) a layer of about 0.5 to 2.0 mils of low density polyethylene adhered to one side of one of said modified polyolefin layers; (3) a layer of about 0.01 to 0.10 mils of a polyester-polyurethane primer adhered to said polyethylene layer; and (4) an outwardly facing layer of oriented polypropylene adhered to said primer layer. In a thermal insulating unit comprising a porous mass of thermally insulative material and a sealed pouch hermetically enclosing said porous mass; the improvement which comprises providing a heat sealed, puncture resistant insulating unit having vapor and gas barrier properties wherein the pouch is formed of a multi-ply laminate of claim 1.