Polyurethane-based insulation board
AssigneeDow Global Technologies LLC
InventorsGiuseppe Vairo, Elena Ferrari, Luigi Bertucelli, Alberto Fangareggi
Life of this patent
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Abstract
External thermal insulation composite systems described herein include a concrete or masonry wall and a multilayer thermal insulation board disposed on the concrete or masonry wall. The multilayer thermal insulation board includes at least one closed cell foam layer comprising polyurethane and polyisocyanurate having an open cell volume of less than 20% by volume according to ASTM D 6226 and at least one open cell foam layer comprising polyurethane and polyisocyanurate having an open cell volume of greater than 80% by volume according to ASTM D 6226.
Claims20
An external thermal insulation composite system, comprising:
- a concrete or masonry external wall;
- and
- a multilayer thermal insulation board disposed on an external surface of the concrete or masonry external wall, the multilayer thermal insulation board, comprising:
- at least one rigid or semi-rigid closed cell polyurethane foam layer having an open cell volume of less than 20% by volume according to ASTM D 6226, the at least one closed cell polyurethane foam layer having opposing major surfaces defining a thickness therebetween,
- at least one rigid or semi-rigid open cell polyurethane foam layer having an open cell volume of greater than 80% by volume according to ASTM D 6226, the at least one open cell polyurethane foam layer being disposed on one or both major surfaces of the at least one closed cell polyurethane layer and having a thickness or a combined thickness, respectively, less than the thickness of the closed cell polyurethane foam layer,
- wherein the multilayer thermal insulation board having a total layer thickness exhibits improved dimensional stability in comparison to a closed cell polyurethane foam board having an identical thickness, length, and width, wherein improved dimensional stability is measured as a dimensional change percentage in the width direction after a 4-day thermal cycle closer to zero than that of the closed cell polyurethane foam board.
A multilayer thermal insulation board, comprising:
- at least one rigid or semi-rigid closed cell polyurethane foam layer having an open cell volume of less than 20% by volume according to ASTM D 6226, the at least one closed cell polyurethane foam layer having opposing major surfaces defining a thickness therebetween and a thermal conductivity value (k-factor) of less than 24 mW/m*K measured at 10° C.;
- and
- at least one rigid or semi-rigid open cell polyurethane foam layer having an open cell volume of greater than 80% by volume according to ASTM D 6226, the at least one open cell polyurethane foam layer being disposed on one or both major surfaces of the at least one closed cell polyurethane layer and having a thickness or a combined thickness, respectively, less than the thickness of the closed cell polyurethane foam layer,
- wherein the multilayer thermal insulation board having a total layer thickness exhibits improved dimensional stability in comparison to a closed cell polyurethane foam board having an identical thickness, length, and width, wherein improved dimensional stability is measured as a dimensional change percentage in the width direction after a 4-day thermal cycle closer to zero than that of the closed cell polyurethane foam board.
Dependencies are inferred from the claim text.