US Patent No: 5,939,463
Number of patents in Portfolio can not be more than 2000
High productivity, low fugitive VOC emission foam process
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Aug 17, 1999
Issued date -
Oct 1, 1997
filing date -
08/941,960
serial no -
In Force
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Abstract
A blowing agent for foaming polystyrene consisting essentially of at least one low permeability volatile organic compound, at least one low volatility non-volatile organic compound and, optionally, at least one high volatility non-volatile organic compound. In one embodiment, the low permeability volatile organic compound is selected from the group consisting of isopentane and isobutane, the low volatility non-volatile organic compound is acetone and the high volatility non-volatile organic compound is carbon dioxide. The blowing agent of the present invention may be used to foam a polystyrene foam structure. The blowing agent is directed to achieving low fugitive volatile organic compounds (VOC) emissions.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,344,710 Polymer foam extrusion system | 49 | 1980 | |
| 4,424,287 Polymer foam process | 81 | 1981 | |
| 4,470,938 Method and apparatus for extrusion of thermoplastic foam | 37 | 1982 | |
| 4,485,059 Polymer foam thermoformation process and apparatus therefor | 23 | 1983 | |
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| 5,356,944 High melt index polystytene foam and method | 15 | 1994 | |
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| 5,453,454 Production of foam boards of high compressive strength from styrene polymers | 17 | 1994 | |
| 5,576,094 Foam boards produced using halogen-free blowing agents | 15 | 1995 | |
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| 5,672,294 Azeotrope-like compositions of 1,1,1,3,3-pentaflurorpropane and hydrocarbons | 28 | 1996 | |
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| 5,562,857 Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and 2-methyl butane | 29 | 1995 | |
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| 4,198,363 Continuous extrusion of thermoplastic materials | 20 | 1978 | |
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| 5,272,479 High sensitivity superconductive digitizer | 15 | 1992 | |
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| 4,528,221 Polystyrene foamed sheet suitable for forming | 41 | 1983 | |
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| 4,956,395 Styrenic foam blowing agent composition | 12 | 1990 | |