Method of Making Foam

摘要

A method of making a foam from a polymerizable resin includes the following steps. A thermally-activated initiator having a temperature below the initiation temperature is combined with an elevated-temperature solution having the polymerizable resin and carbon dioxide at a temperature above a promoted temperature to create a resulting mixture having a temperature above the promoted temperature. The resulting mixture is expanded by decreasing the pressure of the mixture to create a froth having a plurality of cells formed by carbon dioxide that expanded out of solution. The polymerizable resin within the froth is cured to create a foam.

主权项

1. A method of making a foam from a polymerizable resin, the method comprising:
(i) providing a thermally-activated initiator having a given initiation temperature and a given promoted temperature, wherein the temperature of the initiator is below the initiation temperature; (ii) providing an elevated-temperature solution comprising a given amount of the polymerizable resin and carbon dioxide, and optionally promoter, wherein the temperature of the elevated-temperature solution is above the promoted temperature; (iii) combining at a mixing pressure the initiator of step (i) with the solution of step (ii) to form a mixture having a temperature above the promoted temperature; (iv) expanding the mixture by decreasing the pressure of the mixture to below the mixing pressure to create a froth comprising a plurality of cells formed by carbon dioxide that expanded out of solution; and (v) curing the polymerizable resin within the froth to create a solidified matrix encasing the plurality of cells.