| 摘要 |
2075975 9112287 PCTABS00006 A method for producing polymeric foams based upon the N=C=O technology, intended for thermal insulation, floatation, rigidization, and like comprises the use of a liquid gas blowing agent, such as a liquid CO2 in the production of the foam. In addition, the present invention relates to the control of the amount of pre-expansion and post-expansion of the foam. This control can be provided through both the use of a co-blowing agent as well as controlling the pressure at the mixing zone.
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