초록 ▼

Disclosed are microporous, open-celled polymeric foams formed by polymerizing a high internal phase water-in-oil emulsion comprising a continuous oil phase and discontinuous water phase where the foam has a Limiting Oxygen Index (LOI) value of at least about 18% Such foams are commonly known in the

Disclosed are microporous, open-celled polymeric foams formed by polymerizing a high internal phase water-in-oil emulsion comprising a continuous oil phase and discontinuous water phase where the foam has a Limiting Oxygen Index (LOI) value of at least about 18% Such foams are commonly known in the art as "HIPEs". The foams have a variety of flame retardant applications, including use in insulation.

대표청구항 ▼

[ What is claimed is:] [1.] A process for obtaining a flame retardant, open-celled polymeric foam having an Limiting Oxygen Index (LOI) value of at least about 21%, the process comprising the steps of:(A) forming a water-in-oil emulsion from:(1) an oil phase comprising:(a) from about 80% to about 98

[ What is claimed is:] [1.] A process for obtaining a flame retardant, open-celled polymeric foam having an Limiting Oxygen Index (LOI) value of at least about 21%, the process comprising the steps of:(A) forming a water-in-oil emulsion from:(1) an oil phase comprising:(a) from about 80% to about 98%, by weight of the oil phase, of a monomer component comprising:(i) from about 0% to about 90%, by weight of the monomer component, of a substantially water-insoluble, monofunctional monomer capable of forming a homopolymer having a Tg of about 40.degree. C. or less;(ii) from about 0% to about 70%, by weight of the monomer component, by weight of a substantially water-insoluble, monofunctional comonomer capable of imparting toughness about equivalent to that provided by styrene;(iii) from about 5% to about 50%, by weight of the monomer component, of a first substantially water-insoluble, polyfunctional crosslinking agent selected from the group consisting of divinyl benzene and analogs thereof; and(iv) from about 0% to about 20%, by weight of the monomer component, of a second substantially water-insoluble, polyfunctional crosslinking agent selected from the group consisting of diacrylates and dimethacrylates of diols and analogs thereof; and(b) from about 2% to about 20%, by weight of the oil phase, of an emulsifier component which is soluble in the oil phase and which is suitable for forming a stable water-in-oil emulsion;(2) a water phase comprising from about 0.1% to about 20%, by weight of the water phase, of a water-soluble electrolyte;(3) a volume to weight ratio of water phase to oil phase of at least about 3:1; and(4) wherein the emulsion comprises one or more components which confer flame retardancy to the polymeric foam, wherein the one or more components are included at a level of at least about 5%, by total weight of the oil phase; and(B) polymerizing the monomer component in the oil phase of the water-in-oil emulsion to form the polymeric foam material.