Omega-hydrofluoroalkyl ethers, precursor carboxylic acids and derivatives thereof, and their preparation and application
First Claim
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1. A process for preparing a foamed plastic comprising the steps of:
- admixing organic polyisocyanate and high molecular weight compound with at least 2 reactive hydrogen atoms in the presence of;
1) blowing agent mixture comprising at least one normally liquid omega-hydrofluoroalkyl ether compound having a saturated perfluoroaliphatic chain of carbon atoms interrupted by one or more ether oxygen atoms, the chain carbon atom at one end (the proima end) of the chain being that of a difluoromethyl group which is bonded to another chain carbon atom or to a said ether-oxygen atom, the carbon atom at the other end (the distal end) of the chain being part of a distal group selected from the group consisting of difluoromethyl, difluorochloromethyl, a straicht-chain peyfluoroalkyl, a branched-chain perfluoroalkyl, and a perfluoroalkyl substituted with a saturated perfluoroalicyclic moiety, with the proviso that where said difluoromethyl group at the proximal end is bonded to a said ether-oxygen atom, then said straight-chain perfluoroalkyl has at least 6 chain carbon atoms and said branched-chain perfluoroalkyl has at least 4 carbon atoms;
2) a catalyst; and
3) a surfactant.
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Abstract
Normally liquid, omega-hydrofluoroalkyl ether compounds (and selected mixtures thereof) have a saturated perfluoroaliphatic chain of carbon atoms interrupted by one or more ether oxygen atoms. The compounds can be prepared, e.g., by decarboxylation of the corresponding fluoroalkyl ether carboxylic acids and are useful, e.g., in cleaning and drying applications.
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Citations
7 Claims
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1. A process for preparing a foamed plastic comprising the steps of:
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admixing organic polyisocyanate and high molecular weight compound with at least 2 reactive hydrogen atoms in the presence of;
1) blowing agent mixture comprising at least one normally liquid omega-hydrofluoroalkyl ether compound having a saturated perfluoroaliphatic chain of carbon atoms interrupted by one or more ether oxygen atoms, the chain carbon atom at one end (the proima end) of the chain being that of a difluoromethyl group which is bonded to another chain carbon atom or to a said ether-oxygen atom, the carbon atom at the other end (the distal end) of the chain being part of a distal group selected from the group consisting of difluoromethyl, difluorochloromethyl, a straicht-chain peyfluoroalkyl, a branched-chain perfluoroalkyl, and a perfluoroalkyl substituted with a saturated perfluoroalicyclic moiety, with the proviso that where said difluoromethyl group at the proximal end is bonded to a said ether-oxygen atom, then said straight-chain perfluoroalkyl has at least 6 chain carbon atoms and said branched-chain perfluoroalkyl has at least 4 carbon atoms;
2) a catalyst; and
3) a surfactant. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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3. The process of claim 2 wherein said X is a fluorine atom.
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4. The process of claim 2 wherein said normally liquid omega-hydrofluoroalkyl ether compound is represented by the formula:
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5. The process of claim 2 wherein said normally liquid omega-hydrofluoroalkyl ether compound is represented by the formula:
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6. The process of claim 2 wherein said normally liquid omega-hydrofluoroalkyl ether compound is represented by a formula selected from the group consisting of
C8F17— - O—
C2F4H, C7F15—
O—
C2F4H, C6F13—
O—
C2F4—
O—
CF2H,C4F9—
O—
C2F4H, HCF2CF2—
O—
CF2CF2—
O—
CF2CF2H, C4F9—
O—
(CF2)5H,C5F11—
O—
(CF2)5H, C8F17—
O—
(CF2)5H, C4F9—
O—
CF2C(CF3)2CF2H,H(CF2)4—
O—
(CF2)4H, Cl(CF2)4—
O—
(CF2)4H, C6F13—
O—
C2F4H,C4F9—
O—
(CF2)4—
O—
(CF2)3H,(C2F5)2CFCF2—
O—
C2F4H, c-C6F11CF2—
O—
C2F4H, C4F9—
O—
C2F4—
O—
C3F6H,C6F13—
O—
C4F8H, C6F13—
O—
C3F6H, C5F11—
O—
(CF2)4H, C4F9—
O—
C3F6H,C8F17OCF2OC3F6H, HC3F6OC3F6H, C5F11OCF2C(CF3)2CF2H, (C4F9O)2CFCF2H, CF3O(CF2)9H, and (iso-C3F7)2CFOC2F4H.
- O—
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7. The process of claim 1 wherein said normally liquid omega-hydrofluoroalkyl ether compound is represented by the general formula:
Specification