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US 8,557,373 B2Granted
Laminate for protecting metals from corrosive gases
AssigneeNorthern Technologies International Corporation
InventorsDonald Kubik, Barbara Nygaard
Life of this patent
Estimating the term…
Abstract
A corrosive gas resistant laminate comprises an outer polymer layer desirably containing a volatile corrosion inhibitor therein, a corrosion gas resistant barrier layer that can be a hydrophilic polymer, and a tie layer located between said outer and said barrier layers. The various laminates have improved transmission resistance with regard to corrosive gases such as oxygen, hydrogen sulfide, and halogen gases such as chlorine. The laminates can be used to protect metal during storage and transit.
Claims18
A corrosive gas resistant laminate, comprising:
- a laminate capable of wrapping and forming a closed space about a metal surface and capable of preventing metal corrosive gases comprising H2S, SO2, and halogen gases from corroding said metal surface, and wherein said laminate is not utilizable as a food wrap;
- said laminate comprising:
- at least one outer thermoplastic polymer layer comprising a VCI;
- at least one corrosive gas resistant barrier layer;
- at least one tie layer that is compatible with said outer layer and said barrier layer and is located between said outer layer and said barrier layer;
- wherein said at least one tie layer, independently, comprises a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride;
- or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethylvinylacetate, or with ethylene acrylate;
- wherein said laminate has an H2S transmission rate of less than about 200 cc/100 m2/day;
- and
- wherein said VCI is capable of evaporating and filling said closed space.
8 more elements
A corrosive gas resistant laminate, comprising:
- a laminate capable of wrapping and forming a closed space about a metal surface and preventing metal corrosive gases comprising H2S, SO2, and halogen gases from corroding said metal surface, and wherein said laminate is not utilizable as a food wrap;
- said laminate comprising:
- at least one corrosive gas resistant barrier layer;
- at least one outer layer, said outer layer having at least one tie layer compound blended therein that is compatible with said outer layer material and said barrier layer;
- wherein said each tie layer compound, independently, comprises a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride;
- or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethylvinylacetate, or with ethylene acrylate;
- wherein said laminate has an H2S transmission rate of less than about 200 cc/100 m2/day;
- and
- including at least one VCI compound in said outer layer, and wherein said VCI is capable of evaporating and filling said closed space.
7 more elements
A corrosive gas resistant laminate for protecting metal against corrosion, comprising:
- a laminate capable of wrapping and forming a closed space about a metal surface and preventing metal corrosive gases comprising H2S, SO2, and halogen gases from corroding said metal surface, and wherein said laminate is not utilizable as a food wrap;
- said laminate comprising:
- at least one outer layer that is a corrosive gas resistant barrier layer;
- at least inner layer comprising a VCI;
- at least one tie layer that is compatible with said outer barrier layer and said inner layer;
- and wherein each said tie layer, independently, comprises a polyacrylate or a polymethacrylate wherein the ester portion thereof has from 1 to about 12 carbon atoms, or a blend of said polyacrylate or said polymethacrylate with a polyolefin;
- a polyanhydride or a polymaleic anhydride;
- or a copolymer of said polyanhydride or said polymaleic anhydride with an olefin, with ethylvinylacetate, or with ethylene acrylate;
- wherein said laminate has an H2S transmission rate of less than about 200 cc/100 m2/day;
- and
- wherein said VCI is capable of evaporating and filling said closed space.
8 more elements
Dependencies are inferred from the claim text.