Patent ID: 7291389

Claim:
An article comprising (1) a first component composed of a first polymeric composition, the first polymeric composition comprising a side chain crystalline polymer which has (a) a peak melting temperature T p which is −20 to 40° C., (b) an onset of melting temperature T o such that (T p −T o ) is less than (−1.7757e −5 )×(T p 3 )+(3.339e −3 )×(T p 2 )−(6.977e −2 )×(T p )+k, where k is 16, and (c) a heat of fusion of at least 5 J/g; and (2) a second component which (a) is composed of a second composition, and (b) overlaps the first component; the first polymeric composition having a volume expansion between T o and T p which is greater than the volume expansion of the second composition over the same temperature range, and the first and second components having dimensions and shapes such that the article, in the absence of external restraint, changes shape when it is heated from T o to T p and when it is cooled from T p to T o .