Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Reexamination Certificate
2007-12-25
2007-12-25
Zemel, Irina S (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
C521S098000, C521S142000, C521S146000
Reexamination Certificate
active
11016312
ABSTRACT:
A blowing agent blend for making thermoplastic polymer foams comprises methyl formate. The blowing agent blend can further comprise at least one co-blowing agent. The co-blowing agent is either a physical co-blowing agent (e.g. an inorganic agent, a hydrocarbon, a halogenated hydrocarbon, a hydrocarbon with polar, functional group(s), water or any combination thereof), or a chemical co-blowing agent, or combinations thereof. The thermoplastic polymer foam can be an alkenyl aromatic polymer foam, e.g. a polystyrene foam. The blowing agent blend can comprise any combination of methyl formate and one or more co-blowing agents. The methyl formate-based blowing agent blends produce stable foams for various applications, including containers, packaging systems, as well as insulation boards and building materials. A process for the preparation of such foams is also provided.
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Cellular Materials, Encyclopedia of Polymer Science and Technology, J. Wiley and Sons, Article online, copyright 1999-2005.
Brackman Joseph A.
Castner Glenn C.
Handa Yash Paul
Zafar Mohammad
Baker & Botts L.L.P.
Pactiv Corporation
Zemel Irina S
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