Covestro LLC

Gerald W Phelan

George Combs

Disclosed are methods for designing a polyisocyanurate foam-forming composition with good low temperature insulation performance. The methods include: (a) measuring the LTTR of a first polyisocyanurate faced foam laminate prepared from a first polyisocyanurate foam-forming composition comprising a blowing agent composition, wherein the LTTR is measured at a plurality of temperatures to identify a calculated inflection point temperature below which defines a first mathematical correlation between temperature and the LTTR of the first polyisocyanurate faced foam laminate and above which defines a second mathematical correlation between temperature and the LTTR of the first polyisocyanurate faced foam laminate; (b) identifying a plurality of predicted mathematical correlations between temperature and the LTTR of the first polyisocyanurate faced foam laminate at a plurality of reduced inflection point temperatures below the calculated inflection point temperature; and (c) using the plurality of predicted mathematical correlations identified in step (b) to design a second polyisocyanurate foam-forming composition that comprises a blowing agent composition and produces a second polyisocyanurate faced foam laminate that has a LTTR satisfying a threshold value at all mean insulation temperatures within a temperature range of 10&#xb0; F. to 75&#xb0; F. (&#x2212;12.2&#xb0; C. to 23.9&#xb0; C.).

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McMurray, PA, United States of America

Gerald W Phelan