Environmentally friendly driven polyurethane spray foam systems
AssigneeBASF SE
InventorsJosep-Daniel Eslava, Gunnar Kampf, Jan-Michael Dreisoerner, Josep Maria Bringue Campi
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Abstract
Described herein are processes for producing a polyurethane foam by mixing the following: (a) polymeric MDI with less than 40% by weight content of difunctional MDI and an aliphatic halogenated hydrocarbon compound (d1) composed of 2 to 5 carbon atoms and of at least one hydrogen atom and of at least one fluorine and/or chlorine atom, where the compound (d1) includes at least one carbon-carbon double bond, to give an isocyanate component (A), and reacting with a polyol component (b) to give the polyurethane foam. Also described herein is a polyurethane foam obtainable by said process.
Claims17
A process for producing a polyurethane foam by mixing the following to give a reaction mixture:
- (a) polymeric MDI with less than 40% by weight content of difunctional MDI,
- (b) compounds having at least two hydrogen atoms reactive toward isocyanate groups, comprising (b1) at least one polyester polyol and (b2) at least one polyether polyol,
- (c) optionally flame retardant,
- (d) blowing agent, comprising at least one aliphatic halogenated hydrocarbon compound (d1) composed of 2 to 5 carbon atoms and of at least one hydrogen atom and of at least one fluorine and/or chlorine atom, wherein the compound (d1) comprises at least one carbon-carbon double bond,
- (e) optionally catalyst, and
- (f) optionally auxiliaries and additional substances,
- spraying the reaction mixture onto a substrate, and
- allowing said reaction mixture to harden to give the polyurethane foam, wherein
- an isocyanate component (A) comprising polyisocyanates (a) and blowing agent (d1), and a polyol component (B) comprising compounds (b) having at least two hydrogen atoms reactive toward isocyanate groups are produced, and then
- isocyanate component (A) and polyol component (B), and also optionally other compounds (c), (e) and (f) are mixed to give the reaction mixture, wherein a ratio by mass of the isocyanate component (A) to polyol component (B) is at least 1.2.
(canceled)
Dependencies are inferred from the claim text.