Near-azeotropic compositions constituted by hydrogenated fluorocarbons and hydrocarbons, suitable as propellant fluids for aerosol
US5766511A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1996 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Dec 17, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Use of near-azeotropic mixtures of hydrofluorocarbons with butane or isobutane selected from: PA0 A) 1,1,1,2-tetrafluoroethane (HFC-134a) 5-88% by wt PA1 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) 12-95% by wt PA0 B) 1,1,1,2-tetrafluoroethane (HFC-134a) 10-87% by wt PA1 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) 12-81% by wt PA1 n-butane 1-30% by wt PA0 C) 1,1,1,2-tetrafluoroethane (HFC-134a) 18-69% by wt PA1 1,1,1,2,3,3,3-heptafluoropropane (HFC 227ea) 30-81% by wt PA1 isobutane 1-30% by wt as propellant fluids for aerosol. Said mixtures have zero ODP, very low GWP, no or low inflammability, insignificant pressure loss during the use and good solubility towards the typical solvents of aerosol formulations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.