Weatherability of flame retardant polyolefin
AssigneeCiba Specialty Chemicals Corporation
InventorsJurg Zingg, Jurgen Link
Life of this patent
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Abstract
Stabilized thermoplastic polymer, especially polyolefin compositions comprising a flame retardant selected from b1) melamin based flame retardants, or one of the compounds b2) bis-(hexachlorocyclopentadieno)cyclooctane, b3) tris-(2,3-dibromopropyl)-isocyanurate, b4) ethylene-bis-tetrabromophthalimide; b5) 1,2,5,6,9,10-hexabromo-cyclo-dodecan, b6) ethane-1,2-bis(pentabromophenyl); and c) a sterically hindered amine light stabilizer of the hydrocarbyloxyamine or hydroxyhydrocarbyloxyamine class and optional further components combine optimum outdoor weathering stability and good flame retardant properties.
Claims22
A process for imparting light stability and flame retardancy to a thermoplastic polymer (a) by addition of a flame retardant (b) and a sterically hindered amine (c), which process is characterized in that the flame retardant (b) is selected from the group consisting of
- b1) melamin based flame retardants and/or ammonium polyphosphate,
- b2) bis-(hexachlorocyclopentadieno)cyclooctane,
- b3) tris-(2,3-dibromopropyl)-isocyanurate,
- b4) ethylene-bis-tetrabromophthalimide,
- b5) 1,2,5,6,9,10-hexabromo-cyclo-dodecan,
- b6) ethane-1,2-bis(pentabromophenyl);
- and the sterically hindered amine (c) is selected from sterically hindered amine light stabilizers of the hydrocarbyloxyamine and of the hydroxyhydrocarbyloxyamine class, provided that the flame retardant is not (b4) if the sterically hindered amine is of the hydroxyhydrocarbyloxy class.
A flame retardant and light stabilized composition comprising
- a) a polyolefin,
- b) tris-(2,3-dibromopropyl)-isocyanurate as a flame retardant and
- c) a sterically hindered amine light stabilizer of the hydrocarbyloxyamine or hydroxyhydrocarbyloxyamine class.
A flame retardant and light stabilized composition comprising
- a) a polyolefin, and
- b) a flame retardant selected from
- b1) melamin based flame retardants and/or ammonium polyphosphate,
- b2) bis-(hexachlorocyclopentadieno)cyclooctane,
- b3) tris-(2,3-dibromopropyl)-isocyanurate,
- b5) 1,2,5,6,9,10-hexabromo-cyclo-dodecan,
- b6) ethane-1,2-bis(pentabromophenyl);
- and
- c) a sterically hindered amine light stabilizer of the hydroxyhydrocarbyloxyamine class.
A flame retardant composition stabilized against deleterious effects of light and weathering comprising
- a) a thermoplastic polymer,
- b) a flame retardant selected from ammonium polyphosphate, halogenated and/or melamin based flame retardants, and
- c) a combination of sterically hindered amine light stabilizers comprising
- c1) a low molecular weight sterically hindered amine of the hydroxyhydrocarbyloxyamine class, and
- c2) a high molecular weight secondary or alkylated or polymeric tertiary sterically hindered amine.
A flame retardant composition stabilized against deleterious effects of light and weathering comprising
- a) a polyolefin,
- b) a flame retardant selected from ammonium polyphosphate, halogenated and/or melamin based flame retardants, and
- c) a combination of sterically hindered amine light stabilizers comprising, on 100 parts by weight of total component (c),
- c1) 40 to 95 parts by weight a low molecular weight sterically hindered amine of the hydroxyhydrocarbyloxyamine or hydrocarbyloxyamine class, and
- c2) 5 to 60 parts by weight of a high molecular weight secondary or alkylated or polymeric tertiary sterically hindered amine.
Dependencies are inferred from the claim text.