Low-monomer polyurethane foams
AssigneeHenkel AG & Co. KGaA
InventorsHans-Georg Kinzelmann, Uwe Franken, Christoph Lohr
Life of this patent
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Abstract
Cross-linkable foamable composition with low content of monomeric isocyanates, containing a pre-polymer of polyester diols and/or polyether dials reacted i) with asymmetric aromatic diisocyanates to form a reaction product with OH and NCO groups, ii) subsequent addition of and reaction with symmetric aromatic diisocyanate in a quantity at least equivalent to the available OH-groups, 0.1 to 30 wt % additives, at least one propellant, wherein the polyols have a molar mass (MN) of less than 5000 g/mol, and the reaction product has a content of less than 0.1 wt % monomeric asymmetric isocyanate and less than 2 wt % monomeric symmetric isocyanate.
Claims15
A crosslinkable composition with a low content of monomeric isocyanates comprising:
- a) a prepolymer produced from polyester polyols and/or polyether polyols reacted i) with an asymmetric aromatic diisocyanate to yield a reaction product containing OH and NCO groups, ii) subsequent reaction with symmetrical aromatic diisocyanates in a quantity at least equivalent to the OH groups present,
- b) 0.1 to 30 wt % additives, and
- c) at least one blowing agent in a quantity capable of foaming the composition;
- wherein the polyols exhibit a molar mass (MN) of less than 5000 g/mol, and the prepolymer a) has a content of monomeric asymmetric diisocyanates (A) of less than 0.1 wt % and of monomeric symmetric diisocyanates (S) of less than 2 wt %.
Dependencies are inferred from the claim text.