| 摘要 |
Hydrofluoropolyether foaming agents selected from:difluoromethoxy-bis(difluoromethyl ether) of formula HCF2OCF2OCF2H; and/or1-difluoromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether of formula HCF2OCF2CF2OCF2H, and their use in polyurethane foams.
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