Reduced-voc and non-voc blowing agents for making expanded...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/12 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2678685

A blowing agent blend for making thermoplastic polymer foams includes 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 includes methyl formate and one or more co-blowing agents. The methyl formate-based blowing agent blends produce dimensionally stable foams that have improved resistance to flame spread. A process for the preparation of such foams is also provided.

L'invention concerne un mélange d'agents gonflants pour fabriquer des mousses de polymère thermoplastiques qui comprend du formiate de méthyle. Le mélange d'agents gonflants comprend en outre au moins un co-agent gonflant. Le co-agent gonflant est soit un co-agent physique (par exemple, un agent inorganique, un hydrocarbure, un hydrocarbure halogéné, un hydrocarbure avec un ou des groupes fonctionnels, polaires, de l'eau ou toute combinaison de ceux-ci), soit un co-agent gonflant chimique, ou des combinaisons de ceux-ci. La mousse de polymère thermoplastique peut être une mousse de polymère aromatique d'alcényle, par exemple une mousse de poly(styrène). Le mélange d'agents gonflants comprend du formiate de méthyle et un ou plusieurs co-agents gonflants. Les mélanges d'agents gonflants à base de formiate de méthyle produisent des mousses dimensionnellement stables qui ont une résistance améliorée à la propagation de flamme. Un procédé de préparation de telles mousses est également proposé.

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