Production Of Fine Cell Foams Using A Cell Aging Inhibitor
AssigneeEvonik Degussa GmbH
InventorsMichael Klostermann, Carsten Schiller, Joachim Venzmer, Christian Eilbracht
Life of this patent
Estimating the term…
Abstract
The use of an Ostwald hydrophobe in the production of polymer foams, preferably polyurethane foam, in particular rigid polyurethane foam, from liquid reaction mixtures, to retard cell ageing, in particular to retard cell ageing caused by Ostwald ripening, is described.
Claims20
A method or making polymer foams from liquid reaction mixtures, to retard cell ageing, in particular to retard cell ageing caused by Ostwald ripening, said method comprising the step of
- a) adding from from 0.0001 to 5% by mass an Ostwald hydorphobe to a misture for the polymer foam, and
- b) reacting the mixture of step a)
- wherein the polymer foam has a standardized ageing rate kstand of ≤1.0×10−3 mm2/s.
A method or making rigid polyurethane foam from liquid reaction mixtures, to retard cell ageing, in particular to retard cell ageing caused by Ostwald ripening, said method comprising the steps of
- a) adding from from 0.0001 to 3% by mass an Ostwald hydorphobe to a misture for the polymer foam;
- and
- b) reacting the mixture of step a)
- wherein the polymer foam has a standardized ageing rate kstand of ≤0.8×10−3 mm2/s.
Dependencies are inferred from the claim text.