Expandable microspheres for foam insulation and methods

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 3/26 (2006.01) B01J 13/14 (2006.01) B01J 13/18 (2006.01) B32B 5/16 (2006.01) B32B 5/22 (2006.01) C08J 9/32 (2006.01)

Patent

CA 2447273

Hollow thermoexpandable particles or microspheres are provided that contain hydrocarbon blowing agents and have a shell polymer that can be softened at the onset of the expansion temperature and solidified at a higher temperature (thermoset) in an expanded state. Preferably, the microspheres have a shell of thermally expandable and thermally crosslinkable polymer and a hollow interior that contains a hydrocarbon liquid that boils at a temperature below the heat activated crosslinking temperature of the polymer shell. The crosslinking of the shell polymer during or after expansion, which is heat activated at an elevated temperature, can solidify the shell polymer and, then, maintain the expanded volume of the microspheres. The thermoexpandable thermoset polymer particles are useful in insulation, packaging, for making foam materials such as polyurethane or polyisocyanurate rigid foams. The invented thermoset microspheres can substantially improve the close cell percentage and compressive strength of the foam materials and make the foam manufacturing less hazardous.

Cette invention concerne des particules ou microsphères creuses et thermoexpansibles qui contiennent des agents d'expansion hydrocarbonés et sont formées d'un polymère coquille qui peut s'assouplir à la température d'expansion et se solidifier à une température plus élevée (thermodurcissement) après expansion. Les microsphères ont de préférence une coquille formée d'un polymère thermiquement expansible et réticulable, et un intérieur creux contenant un liquide hydrocarboné qui bout à une température inférieure à la température de réticulation thermoactivée de la coquille du polymère. Pendant ou après l'expansion, la réticulation du polymère coquille, thermoactivée à une température élevée, peut solidifier le polymère et ainsi maintenir le volume expansé des microsphères. Les particules formées de polymères, thermoexpansibles et thermodurcies, servent pour l'isolation, l'emballage, la confection de matériaux alvéolaires tels que les mousses rigides en polyuréthanne ou polyisocyanurate. Ces microsphères thermodurcies peuvent améliorer sensiblement le pourcentage d'alvéoles fermés et la résistance à la compression des matériaux alvéolaires, et rendre leur fabrication plus sûre.

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