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US 5,508,082 AGranted
Composite panels having two outer layers and a core
AssigneeAlusuisse-Lonza Services Ltd.
InventorsRainer Ehrat, Rene Bregenzer
Life of this patent
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Abstract
Composite panels with high fire-proofing capacity have two outer layers and a core that features a core mixture containing aluminum hydroxide in compacted form, lightweight fillers, in some cases fine gained or splintery aluminum hydroxide, as desired magnesium hydroxide and polymer-based binding agents. The composite panels are suitable e.g. as facade panels for building constructions.
Claims8
Composite panel which comprises two outer layers parallel to a core, wherein the core includes a mixture containing a filler material and a binding agent, wherein the core mixture contains:
- a) 35 to 60 wt % aluminum hydroxide in compacted form and having an average particle size of 0.3 to 1.0 mm,
- b) 15 to 25 wt % lightweight filler having an average particle diameter of 5 to 1500 .mu.m,
- c) at least one member selected from the group consisting of fine grained aluminum hydroxide having an average grain size of 10 to 30 .mu.m and splintery aluminum hydroxide having an average grain size of 10 to 30 .mu.m present in said core mixture in an amount of up to and including 25 wt %,
- d) at least one member selected from the group consisting of magnesium hydroxide having an average grain size of 10 to 50 .mu.m and magnesium hydroxide having an average grain size of 0.3 to 1.0 mm present in an amount of 0 to 20 wt %, and
- e) 4 to 10 wt % binding agent derived from polymers exhibiting a modulus of elasticity of 90-140 MPa and an elongation at fracture of 400-800%.
2 more elements
Dependencies are inferred from the claim text.