B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/71, 154/92
B32B 15/08 (2006.01)
Patent
CA 1141641
ABSTRACT OF THE DISCLOSURE This invention provides metal-thermoplastic-metal laminates and a process for preparing same which possess critical service properties of low coefficient of linear thermal expansion, low inelastic ratio, and excellent flexural stiffness. The laminate is comprised of a thermoplastic core layer having a minimum thickness of 0.0483 cm; and a metal layer laminated on each side of the core, each metal layer having a minimum thickness of 0.00127 cm. When the core is high density polyethylene, aluminum is not the metal layer on both sides; and when the core is polypropylene, aluminum is the metal layer on each side. The laminate has a maximum weight of about 5.37 kg/m2 and the thickness ratio of the sum of the metal layer thicknesses to the core layer thickness is described by the region of numerical overlap of the parameter TR(YSm/TSc) wherein TR is the thickness ratio of the sum of the metal layer thicknesses to the core layer thickness; YSm is the thickness-weight-average tensile yield strength of the two metal layers at an offset of 5% elongation; and TSc is the tensile strength of the core layer; as determined from the areas defined by the relationships of TR(YSm/TSc) to the inelastic ratio of the laminate as measured in flexure at 5% strain in the outer metal layers at the point of maximum deflection (IR?); and the coefficient of linear thermal expansion of the laminate (CLTE?); the lower boundary of these areas being defined by the equation of a straight line y = mx + b in which y is the y-axis parameters of IR? and CLTE? , x is the x-axis parameter of TR(YSm/TSc), m is the slope of the straight line and b is the intercept on the y-axis. The laminates are useful in construction applications such as outer and inner building panels, appliance panels, and transportation vehicle body panels, for example, automobiles, boats and airplanes.
342605
Erickson Floyd B.
Gabbert James D.
Hedrick Ross M.
Woodbrey James C.
Mcfadden Fincham
Solutia Inc.
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