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US 5,290,823 AGranted
Production of rigid polyurethane foams, and a blowing agent mixture for this purpose
AssigneeBASF SE
InventorOtto Volkert
Life of this patent
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Abstract
The invention relates to a process for the production of rigid polyurethane foams using a specific blowing agent mixture of highly fluorinated and/or perfluorinated organic compounds, cyclopentane and, if desired, aliphatic and/or further cycloaliphatic hydrocarbons having 4 to 8 carbon atoms.
Claims13
A process for the production of rigid polyurethane foams by reacting
- a) organic and/or modified organic polyisocyanates with
- b) at least one relatively high-molecular-weight compound containing at least two reactive hydrogen atoms, and, if desired,
- c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of
- d) blowing agents,
- e) catalysts and, if desired,
- f) assistants and/or additives,
- which comprises using, as blowing agent (d), a mixture of
- (d1) from 5 to 40% by weight of at least one highly fluorinated and/or perfluorinated organic compound, said highly fluorinated organic compound being at least 85% fluorinated,
- (d2) from 30 to 95% by weight of cyclopentane and
- (d3) from 0 to 45% by weight of at least one aliphatic and/or cycloaliphatic hydrocarbon having 4 to 8 carbon atoms.
7 more elements
Dependencies are inferred from the claim text.