Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1999-06-16
2000-06-27
Cooney, John M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 98, 521155, 252 67, 252 69, 252364, 510177, 510408, 510412, 510415, C08J 914
Patent
active
060807997
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to mixtures with 1,1,1,3,3-pentafluorobutane (R 365 mfc) and their use for the manufacture of foamed plastics.
The use of partially fluorinated hydrocarbons as blowing agents for the manufacture of foamed plastics is already known. The international patent application WO 92/00345 discloses the use of partially fluorinated alkanes with 4 or 5 carbon atoms, which have a "tertiary structure", as blowing agents for the manufacture of polyurethane and polyisocyanurate foamed plastics.
The German Offenlegungsschrift DE 44 22 714 A1 discloses compositions, which contain 1,1,2-trifluoroethane, and the use of such compositions as blowing agents for the manufacture of foamed plastics. The international patent application WO 96/14354 discloses the manufacture of foamed plastics, for which a liquid blowing agent composition is used, which contains liquefied carbon dioxide under pressure. The blowing agent compositions may, moreover, contain fluorinated chlorinated hydrocarbons and fluorinated hydrocarbons, for example, also 1,1,1,3,3-pentafluorobutane (R 365 mfc). The German patent application 195 41 013 discloses, among other things, blowing agent compositions for the manufacture of highly resilient polyurethane foam. The blowing agent compositions comprise 50 to 95 parts by weight of 1,1,1,2-tetrafluoroethane and 5 to 50 parts by weight of 1,1-difluoroethane and/or readily volatile organic compounds. WO 96/12758 discloses blowing agent mixtures for the production of rigid polyurethane foams. The blowing agents may, if desired, contain fluorinated hydrocarbons such as 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane, 1,1,1,3,3-pentafluorobutane, or 1,1,1,3,3,3-hexafluoropropane. The WO 96/30439 discloses azeotropic compositions comprising, among other things, 1,1,1,4,4,4-hexafluorobutane or perfluorohexane and certain C.sub.5 or C.sub.6 hydrocarbons. These compositions can be used as blowing agents for the manufacture of rigid polyurethane foams.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a method, which enables advantageous, foamed plastics, especially polyurethane foams, to be manufactured with simpler processing. It is furthermore an object of the present invention to indicate mixtures, which do not have a flash point and with which foamed polymer plastics, for example, with qualitatively advantageous properties, to be produced in a simple manner.
This object is achieved by the present invention.
Inventive mixtures, which can be used as blowing gas for the manufacture of foamed plastics, contain or consist of 50 to 99% by weight of 1,1,1,3,3-pentafluorobutane (HFC 365 mfc) and 1 to 50% by weight of at least one fluorinated hydrocarbon selected from the group consisting of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane, 1,1,1,3,3,3-hexafluoropropane and 1,1,1,2,3,3,3-heptafluoropropane.
1,1,1,3,3-pentafluorobutane lies at the limit of flammability. The inventive mixtures are distinguished owing to the fact that they do not represent flammable liquids at 20.degree. C. They are suitable particularly for use as a blowing gas for the manufacture of foamed plastics; they can, however, also be used for other purposes such as a refrigerant, a solvent or a cleaning agent.
DESCRIPTION OF PREFERRED EMBODIMENTS
Preferred mixtures contain or consist of 80 to 99% by weight of 1,1,1,3,3-pentafluorobutane and 1 to 20% by weight of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3,3-hexafluoropropane and/or 1,1,1,2,3,3,3-heptafluoropropane, especially mixtures which contain or consist of 80 to 99% by weight of 365 mfc and 1 to 20% by weight of 134a and/or 227 ea.
Especially preferred mixtures with 134a contain or consist of 91 to 95% by weight of 1,1,1,3,3-pentafluorobutane and 5 to 9% by weight of 1,1,1,2-tetrafluoroethane; mixtures, which consist of the given compounds in the given amounts have a boiling point of 20.degree. C.
Especially preferred mixtures with 227 ea are those, which contain or consist of 80 to 99% by weight o
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Kruecke Werner
Zipfel Lothar
Cooney John M.
Solvay Fluor und Derivate GmbH
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