METHODS FOR PREPARING OPEN-CELLED POLYURETHANE FOAMS, SYSTEMS FOR USE THEREIN, AND OPEN-CELLED POLYURETHANE FOAMS PRODUCED THEREBY

摘要

Disclosed are methods and systems for preparing open-celled polyurethane foams by a discontinuous box foam process in which (a) a polyurethane foam-forming composition is deposited into a container having a gas-permeable base and (b) the polyurethane-foam forming composition is allowed to form an open-celled polyurethane foam in the container. In these methods and systems, the gas-permeable base is heated before, during, and/or after step (a) and heating is continued during at least a portion of step (b).