Methods for making foams using blowing agents comprising unsaturated fluorocarbons
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph Anthony Creazzo, Mario Joseph Nappa, Allen Capron Sievert, Ekaterina N. Swearingen
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Abstract
Disclosed herein are blowing agents comprising fluorocarbons and/or hydrofluorocarbons useful in foamable compositions. Also disclosed are methods for forming a foam comprising the aforementioned blowing agents.
Claims14
A method of forming a polyisocyanate-based foam comprising
- forming a blend by mixing a blowing agent comprising a hydrofluorocarbon, with
- at least one polyol, wherein said blowing agent is not fully soluble in said polyol
- reacting at least one organic polyisocyanate with said blend, wherein said blowing agent comprising a hydrofluorocarbon having the formula E- or Z—R1CH═CHR2, wherein R1 and R2 are, independently, C1 to C6 perfluoroalkyl groups.
A method of producing polyurethane foams, comprising the steps of blending at least one polyol and at least one blowing agent, to form B side mixture having the appearance of an emulsion, said blowing agent comprising a hydrofluorocarbons selected from the group consisting of E-CF3CH═CHCF3, Z—CF3CH═CHCF3, E-CF3CH═CHCF2CF3, and Z—CF3CH═CHCF2CF3, and reacting said B side mixture with an A side mixture, said A side mixture comprising at least one organic polyisocyanate.
Dependencies are inferred from the claim text.