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US 4,396,749 AGranted
Preparation of composite polymers containing active hydrogen atoms
AssigneeShell Oil Company
InventorsHendrik van Ballegooijen, John C. Chadwick
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AssigneeShell Oil Company
InventorsHendrik van Ballegooijen, John C. Chadwick
Estimating the term…
Composite polymers, especially composite polyols containing active hydrogen atoms can be prepared by polymerizing one or more olefinically unsaturated compounds in the presence of a liquid polymer containing active hydrogen atoms and a modified initiator; the modification comprising the reaction between a liquid polymer containing one or more groups which can react with isocyanato groups and a compound containing two or more isocyanato groups which has been partially converted by reacting it with an organic hydroperoxide or a free-radical initiator also containing additional active hydrogen atoms. The composite polymers exhibit a stable dispersed polymer phase and can be suitably applied as starting materials for polyurethane foams.
A process for the preparation of composite polymers containing active hydrogen atoms capable of reaction with isocyanato groups comprising polymerizing one or more olefinically unsaturated compounds in the presence of an initiator system, the improvement which comprises using as an initiator system the reaction product of a liquid polymer containing one or more groups which can react with isocyanato groups and a peroxycarbamate containing isocyanato groups, said peroxycarbamate having been prepared by the reaction of an excess of a compound containing at least two isocyanato groups with an organic hydroperoxide or a free-radical initiator having additional active hydrogen atoms.
Dependencies are inferred from the claim text.