US1980889A - Heat insulating material - Google Patents

Description

Patented Nov. 13, 1934 HEAT INSULATING MATERIAL George Miller Thomson, Caledonia, Ontario, Canada N Drawing. Application December 21, 1931, iggal No. 582,509. In Canada December 17,

2 Claims. (Cl. 106-20) The invention relates to heat insulating material treated with heat to cause its layers or laminations of the type consisting of a pulverulent, granular to exfoliate or partially separate, thus producing or powdered mass of relatively mobile particles a light, flaky, non-inflammable material having capable of being poured to form a heat insulating air spaces between the layers. Pieces of this ma- 5 layer or partition. Many materials of this type terial of from about one-eighth to one-half inch 60 are known, for example, ground wallboard, cork may conveniently be employed. According to a and, the like, preferred form of the invention these pieces of A disadvantage of this type of insulating maexfoliated material are mixed as uniformly as terial is that, on account of its incoherent nature, possible with ground gypsum wallboard.

it is compressible and therefore liable to settle or The greater the proportion of exfoliated ma- 65 sag if subjected to shaking or vibration, thus interial employed, the less will be insulating macreasing the density of the material and reducing terial be able to settle or sag when subjected to its insulating efficiency, and also leaving an unvibration. Good results have been obtained by insulated space above the mass of material. mixing to of exfoliated vermiculite with 15 The present invention has for object to provide to 50% of ground gypsum wallboard.

an improved material of the type described, in What I'claim is: which the tendency to settle is greatly reduced, 1. An article of manufacture consisting of a whereby, under normal conditions of use, the dismass of ground gypsum wallboard having pieces advantage above mentioned is substantially elimiof exfoliated vermiculite varying in size from one- 20 nated or, at least, reduced to negligible proporeighth to one-half inch distributed throughout tions. the mass.

With this end in view the invention consists in 2. An article of manufacture consisting of a a heat insulating material of the kind described mixture of 40 to 50% by weight of exfoliated verhaving small pieces of an exfoliated mineral submiculite and 60 to 50% of ground gypsum wall- 25 stance of laminated form distributed throughout board.

the mass. GEORGE MILLER THOMSON.

The preferred mineral substance is vermiculite so s5