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AssigneeDow Global Technologies LLC
InventorsMark Allen, Huzeir Lekovic, Srikanth Miryala, Arnold Braun
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A structural member is reinforced with a thermoset polymer foam having (a) a density of 80-650 kg/m3, (b) a storage modulus, measured on a 12 mm wide×3.5 mm thick×17.5 single cantilever sample according to ASTM D 4065-01, under conditions of 1 Hz and a heating rate of 2° C./min, such that the ratio of the storage modulus at 0° C., expressed in MPa, divided by the density of the thermoset polymer foam, expressed in kg/m3, is at least 0.4, and (c) the ratio of the storage modulus of the thermoset polymer foam at 100° C. divided by the storage modulus of the thermoset polymer foam at 0° C. is at least 0.5. The foam is preferably a polyurethane-isocyanurate foam. The foam exhibits excellent resistance to cracking due to mechanical and thermal stresses.
A reinforced comprising a structural member having a cavity containing a reinforcing foam, wherein the reinforcing foam is a structural thermoset polymer foam (a) having a density of from 80 to 650 kg/m3, (b) having a storage modulus such that the ratio of the storage modulus at 0° C., expressed in MPa, divided by the density of the thermoset polymer foam, expressed in kg/m3, is at least 0.4, and (c) having a storage modulus such that the ratio of the storage modulus of the thermoset polymer foam at 100° C. divided by the storage modulus of the thermoset polymer foam at 0° C. is at least 0.5, such storage moduli being measured according to ASTM D 4065-01 on a 12 mm wide×3.5 mm thick×17.5 mm single cantilever sample, under conditions of 1 Hz and a heating rate of 2° C./min, and said density being a core density measured according to ASTM D 3574 at 22±3° C.
A reinforcing insert for reinforcing a structural member having a cavity, the reinforcing insert comprising a core of a structural thermoset polymer foam having a thermally expandable adhesive upon at least a portion of its outer surface, wherein (1) the thermoset polymer foam has a density of from 80 to 650 kg/M3, (2) the thermoset polymer foam has a storage modulus such that the ratio of the storage modulus at 0° C., expressed in MPa, divided by the density of the thermoset polymer foam, expressed in kg/m3, is at least 0.4, and (c) the ratio of the storage modulus of the thermoset polymer foam at 100° C. divided by the storage modulus of the thermoset polymer foam at 0° C. is at least 0.5, such storage moduli being measured according to ASTM D 4065-01 on a 12 mm wide×3.5 mm thick×17.5 mm single cantilever sample, under conditions of 1 Hz and a heating rate of 2° C./min, and said density being a core density measured according to ASTM D 3574 at 22±3° C.
Dependencies are inferred from the claim text.