Flame retardant polymer compositions
View Patent ↗Flame retardant compositions are disclosed which comprise (a) at least one particulate material which expands on the application of heat and (b) at least one particulate nano-filler, together with at least one polymer and/or at least one curable monomer or oligomer. The compositions may also contain certain silicon-based materials. Flame-retardant compositions comprising polyorganosiloxanes containing one or more functional groups selected form amino, hydroxyl, methacrylic, acrylic and epoxy groups, are also disclosed.
1. A process for the manufacture of a cured article which comprises admixing at least one expandable particulate material which expands on the application of heat with at least one particulate nano-filler and at least one curable monomer, oligomer and/or polymer to form a mixture and subsequently curing the mixture.
2. A method of making an adhesive bond, seal or coating comprising applying a composition comprising at least one expandable particulate material which expands on the application of heat and at least one particulate nano-filler, together with at least one polymer and/or at least one curable monomer or oligomer to a substrate and curing the composition.
3. A curable composition comprising (i) one or more reactive monomers, oligomers and/or polymers comprising at least one polyorganosiloxane containing one or more amino, hydroxyl, methacrylic, acrylic or epoxy groups and (ii) a second component containing reactive species selected from the group consisting of:
a. epoxy-functional compounds in combination with amino-functional compounds;
b. hydroxy-functional compounds in combination with isocyanate-functional compounds; and
e. methacrylic or acrylic functional compounds.
4. The composition according to claim 3 wherein the reactive species is selected from the group consisting of an epoxy-functional compound in combination with an amino-functional polyorganosiloxane, an isocyanate-functional compounds in combination with a hydroxyl-functional polyorganosiloxane and a methacrylic or acrylic functional compounds in combination with a methacrylated or acrylated polyorganosiloxane.
5. The composition according to claim 4 wherein the polyorganosiloxane is polydimethylsiloxane.
6. The composition according to claim 4 which further includes at least one expandable particulate material which expands on the application of heat and at least one particulate nano-filler.
7. A method of enhancing the fire resistance of a substrate by applying a curable composition according to claim 3 to the substrate.