| abstract |
The present invention relates to a method for manufacturing a thermoset polyester foam, including the following consecutive steps: (a) providing an expandable, thermosetting composition which contains: a polyol component including at least one element selected from glycerol, diglycerol and the glycerol oligomers; a polyacid component including citric acid; a surface-active agent; and an esterification catalyst, (b) injecting the expandable, thermosetting composition into a mould or applying the expandable composition to a substrate, (c) heating the expandable, thermosetting composition to a temperature no lower than 135 °C, preferably no lower than 175 °C, so as to react the polyol component with the polyacid component and to form a block of thermoset polyester foam. |