摘要:
A closure panel (10), which finds particular utility as a liftgate or endgate for an automotive vehicles, such as a truck (14). Typically, the assembly includes a first panel portion (20) opposite a second panel portion (22) and an intermediate material therebetween. Preferably, one or more of the panel portions is formed of a polymeric material and the intermediate material is preferably a structural foam that can bond to both the first and the second panel portions.
摘要:
Expandable polymer compositions are used to reinforce or provide various types of insulation to cavities in structural elements. The polymer compositions include at least two different segments, which may or may not be joined. At least one of the segments will expand before another segment when heated. The fixst-to- expand segment forms a physical barrier to the expansion of later-expanding segments, thereby restricting the expansion of the later-expanding segment in at least one direction. In this manner, the location of the expanded polymer within the cavity can be easily and inexpensively controlled.
摘要:
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 x 3.5 mm thick x 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.
摘要:
The present invention is an article comprising a shaped rigid foam part 810); a heat activated foamable adhesive (30) applied directly to at least a portion of the outer surface of the shaped foam part and an integral locating means (40). A second aspect of the invention is a method of forming a foam filled vehicle hollow member comprising, (a) inserting into a vehicular hollow member (5) a rigid foam part 10) comprised of a rigid foam (10) having a heat activated foamable adhesive (30) on at least a portion of the rigid foam insert and at least one integral locating means (40) extending from a surface of the rigid foam, (b) engaging the locating means (40) with the hollow member (5) to locate the rigid foam part (10) within the hollow member, and (c) heating the hollow member having the rigid foam part therein to a temperature and for a time sufficient to activate the heat activated expandable adhesive (30) to form the foam filled vehicle hollow member.
摘要:
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 x 3.5 mm thick x 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.