Back to results
US 2004/0176489 A1Published application
Foaming compositions
AssigneeAusimont S.p.A.
InventorsEzio Musso, Giampiero Basile, Sauro Girolomoni
Life of this patent
Estimating the term…
Abstract
Use as foaming agents having a low environmental impact of azeotropic or near azeotropic compositions using difluoromethoxy-bis(difluoromethyl ether) and/or 1-difluroromethoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether.
Claims10
A process for foaming polyurethanes comprising:
- adding to compositions used to make solid polymers azeotropic or near azeotropic foaming agents compositions as substitutes for CFC 11 to give a homogeneous foam having density of about 30 Kg/cm3, said foaming agent compositions based on di-fluoromethoxy-bis(difluoromethyl ether) and/or 1-difluoro-methoxy-1,1,2,2-tetrafluoroethyl difluoromethyl ether, said foaming agent compositions essentially selected from the group consisting of:
- 29 Composition % by weight IV) difluoromethoxy 1-99 bis(difluoromethyl ether) (HCF2OCF2OCF2H);
- 1,1,1,3,3-pentafluorobutane 99-1 (CF3CH2CF2CH3, HFC 365mfc) V) difluoromethoxy 1-40 bis(difluoromethyl ether) (HCF2OCF2OCF2H);
- 1,1,1,4,4,4-hexafluorobutane 99-60 (CF3CH2CH2CF3, HFC 365ffa)
- wherein the difluoromethoxy-bis(difluoromethyl ether) part contains up to 40% by weight of 1-difluoromethoxy-1,1,2,2-tetrafluoroethyldifluoromethyl ether.
2 more elements
Polyurethane polymer foaming compositions comprising, as blowing agent substitutes of CFC-11 to give a homogeneous foam having density of about 30 Kg/cm3, foaming agent azeotropic or near azeotropic compositions selected from the group consisting of:
- 32 composition % by weight IV) difluoromethoxy 1-99 bis(difluoromethyl ether) (HCF2OCF2OCF2H);
- 1,1,1,3,3-pentafluorobutane 99-1 (CF3CH2CF2CH3, HFC 365 mfc) V) difluoromethoxy 1-40 bis(difluoromethyl ether) (HCF2OCF2OCF2H);
- 1,1,1,4,4,4-hexafluorobutane 99-60 (CF3CH2CH2CF3, HCF 356 ffa).
- wherein the diflouromethoxy-bis (difluoromethyl ether) parts contains up to 40% by weight of 1-difluoromethoxy-1,1,2,2-tetrafluoroethyldifluoromethyl ether.
1 more element
Dependencies are inferred from the claim text.