Laminate of metal with thermoplastic material

Claim 1

A conduit for transporting fluids through atmospheric air comprising: A. a pipe; B. thermal insulation surrounding the pipe; C. a moisture vapor barrier completely surrounding the thermal insulation said moisture vapor barrier constituting a laminate comprising: I. an aluminum sheet: (a) having a thickness of 0.001 to 0.1 inch; (b) having on its surfaces an adhesion-promoting amount of a copolymer of vinyl chloride and vinyl acetate; and II. an upper sheet of thermoplastic material adhering to the top of the aluminum sheet; and III. a lower sheet of thermoplastic material adhering to the bottom of the aluminum sheet; wherein the thermoplastic material consists essentially of: (a) chlorinated polyethylene: (1) having a melt viscosity of 8,000 to 25,000 poises; (2) comprising from 25 to 50 percent by weight chlorine; (3) having a crystallinity of less than 3%; (4) having a glass transistion temperature of less than 20° C.; and (b) calcium carbonate having a particle size such that it passes through a U.S. standard screen of 100 mesh/inch; wherein the weight ratio of a:b is 1:5 to 5:1; (c) a pigment comprising from 1 to 35 percent by weight of the thermoplastic material; and (d) a stabilizer.