Thermal insulating mat

DETAILED DESCRIPTION I claim: 1.
A thermal insulating mat comprising a plurality of sealed chambers filled with a filler gas having a heat conductivity lower than air, said sealed chambers being formed by spaced flexible film with at least two layers of separate chambers formed by separate continuous flexible films disposed one over the other with said separate continuous films having portions thereof that extend parallel with said spaced film and adjacent portions that extend perpendicular to said spaced film with said parallel portions secured in a gas-tight manner to at least one of said spaced film thereby forming a plurality of separate chambers between said spaced parallel film.
2.
A thermal insulating mat as defined by claim 1, characterized in that the filler gas at least partially comprises carbon dioxide (CO.
sub.
2).
3.
A thermal insulating mat as defined in claim 1, characterized in that the filler gas comprises a single gaseous substance.
4.
A thermal insulating mat as defined by claim 1, characterized in that the filler gas is free of noble gas.
5.
A thermal insulating mat as defined by claim 1, characterized in that said thermal insulating mat comprises translucent films having good light-transmissivity.
6.
A thermal insulating mat as defined by claim 1, characterized in that the chambers of one layer are disposed beside one another with no space between them.
7.
A thermal insulating mat as defined by claim 1, characterized in that the chambers of one layer are disposed spaced apart laterally from one another.
8.
A thermal insulating mat as defined by claim 7, characterized in that the interstices between the chambers are likewise filled with filler gas, the thermal conduction coefficient of which is smaller than that of air and which filler gas preferably corresponds to the filler gas filling the chambers.
9.
A thermal insulating mat as defined by claim 1, characterized in that said thermal insulating mat comprises plastic film.
10.
A thermal insulating mat as defined by claim 1, characterized in that the chamber has a volume of 1 cm