INSULATING GLASS WINDOW ASSEMBLIES

Sealed insulating glass window assemblies are produced by arranging sheets of glass with spacers therebetween so as to present an outwardly facing channel about the edges of the assembly and a hot melt sealant characterized by very low moisture vapor transmission is introduced into the channel at an elevated temperature and in a fluid condition to establish an intimate sealing bond between the glass and spacer means. The sealant used is an intimate mixture of an elastomeric polymer, plasticizing and tackifying resins and, in some cases, an adhesion promoter. The sealant is fluid at temperatures above about 200 DEG F and is applied to preassembled glass sheets and spacer members in that condition but upon cooling attains a hardness of about 10 to 80 on the Shore A Durometer scale.