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).

主权项

1. A method for preparing an open-celled polyurethane foam, comprising:
(a) depositing a polyurethane foam-forming composition into a container having a gas-permeable base; and (b) allowing the polyurethane-foam forming composition to form an open-celled polyurethane foam in the container, wherein the method comprises heating the gas-permeable base before, during, and/or after step (a) and continuing the heating during at least a portion of step (b), and wherein the method is discontinuous.