Composite panels having two outer layers and a core
AssigneeAlusuisse-Lonza Services Ltd.
InventorsRainer Ehrat, Rene Bregenzer
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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 grained 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.
Claims9
Process for manufacturing a composite panel comprising two outer layers and a core, said core containing individual components including a mixture of a filler material and a binding agent, including the step of preparing the core mixture by mixing the individual components, and using a binder based on polymers exhibiting a modulus of elasticity of 90-140 MPa and an elongation at fracture of 400-800%, and having an average grain size of 10 to 30 .mu.m, including the step of preparing the core mixture by mixing the following components:
- 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) 0 to 25 wt % fine grained or splintery aluminum hydroxide having an average grain size of 10 to 30 .mu.m,
- d) 0 to 20 wt % magnesium hydroxide with an average grain size of 10 to 50 .mu.m, or 0 to 20 wt % magnesium hydroxide having an average grain size of 0.3 to 1.0 mm, and
- e) 4 to 10 wt % binding agent based on polymers exhibiting a modulus of elasticity of 90-140 MPa and an elongation at fracture of 400-800%.
Dependencies are inferred from the claim text.