초록 ▼

A spacer is coiled about a drawn, seamless copper tube, and a metal foil or metallized paper ribbon is folded around the coiled spacer. A blend for foaming is injected into the unoccupied space between the folded foil or ribbon and the inner tube, to generate a cyanurate-modified polyurethane foam n

A spacer is coiled about a drawn, seamless copper tube, and a metal foil or metallized paper ribbon is folded around the coiled spacer. A blend for foaming is injected into the unoccupied space between the folded foil or ribbon and the inner tube, to generate a cyanurate-modified polyurethane foam network in which phosphorous or halogen molecules are embedded by chemical bond. A flame-resistant ribbon is folded about the metal tube. The resulting product and further details of the process are described.

대표청구항 ▼

Thermally insulated tube for installation in buildings, or the like, comprising: a metal inner tube; a metal foil or ribbon of at least 0.05 mm thickness, having been formed into an outer tube and disposed coaxially about the said inner tube and having overlapping interconnected edges; spacer means

Thermally insulated tube for installation in buildings, or the like, comprising: a metal inner tube; a metal foil or ribbon of at least 0.05 mm thickness, having been formed into an outer tube and disposed coaxially about the said inner tube and having overlapping interconnected edges; spacer means on the inner tube and supporting the outer tube, there being space left between the inner and outer tubes not occupied by the spacer means; a foam in said space being comprised of an isocyanurate-modified polyurethane network which includes urethane groups and primarily isocyanurate units, resulting from and being the reaction product of an aromatic polyisocyanate, and of a polyether polyol in chemical bond with molecules of a flame-resisting substance, in the presence of a catalyst blend which includes a trimerizing catalyst for the isocyanurate reaction; and a synthetic flame-resisting envelope on the metal foil tube, in intimate contact but without interconnection therewith.