Polyurea dispersions in organic isocyanates
AssigneeImperial Chemical Industries PLC
InventorsJeffrey Hughes, John Hynds
Life of this patent
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Abstract
A dispersion of a polyurea in an aromatic polyisocyanate is prepared by mixing the polyisocyanate with one or more aliphatic diprimary diamines having (a) at least one amine group attached to a carbon atom having not more than one hydrogen atom attached thereto or (b) at least one amine group attached to a carbon atom which is itself attached to a carbon atom having not more than one hydrogen atom attached thereto, provided that both amine groups are not attached directly to separate rings of an alkylene-linked polycyclic aliphatic ring system. The reaction preferably takes place at a temperature in the range 20.degree. C. to 60.degree. C. The polyurea dispersion products are useful for manufacture of polyurethane foams and elastomers of superior physical properties.
Claims9
A process for the manufacture of polyurethane elastomers which comprises reacting a polyol with a dispersion of a polyurea in an aromatic polyisocyanate, said dispersion having been prepared by a process which comprises reacting by simple mixing at a temperature below 90.degree. C. an aromatic polyisocyanate with one or more aliphatic or alicyclic diprimary amines having (a) at least one amine group attached to a carbon atom having not more than one hydrogen atom attached thereto or (b) at least one amine group attached to a carbon atom which is itself attached to a carbon atom having not more than one hydrogen atom attached thereto, provided that both amine groups are not attached directly to separate rings of an alkylene-linked polycyclic aliphatic ring system.
Dependencies are inferred from the claim text.