US Patent No: 4,684,669
Number of patents in Portfolio can not be more than 2000
Modified polyphenylene ether resins having improved foamability and methods of making the same
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Aug 4, 1987
Issued date -
Nov 3, 1986
filing date -
06/926,429
serial no -
Expired
status
Importance
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Abstract
The production of foamed articles of polyphenylene ether resins is improved by including a modifier comprising an alpha, beta-unsaturated carboxylic acid or derivative. The resulting products are lightweight, exhibit superior heat resistance and retain flame retardancy over polyphenylene ether resins which are foamed in the absence of the modifier. Such resins are especially suited for the production of extrusion and injection foam molding materials.
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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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| 4,197,370 Foamable polyphenylene oxide composition with thermally unstable copolymer as foaming agent | 9 | 1976 | |
| 4,280,005 Foamable polyester composition | 18 | 1979 | |
| 4,334,030 Thermoplastic foamable blends | 13 | 1979 | |
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| 4,607,059 Gas-releasing composition for tailoring gas evolution of system IR 2811 | 9 | 1985 | |
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| 4,288,560 Process for foaming plastics | 8 | 1980 | |
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| 4,467,051 Method of producing a cellular resin suitable for use as an insulating material | 11 | 1983 | |
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| 4,594,208 Polymer foam, thermoformed shapes thereof and methods of forming same | 7 | 1984 | |