Polyethylene terephthalate composite structures having integral crystalline skins on a foam of polyethylene terephthalate are described. The structures exhibit enhanced physical properties compared to polyethylene terephthalate foams. The structures are produced by a method that crystallizes a portion...http://www.google.es/patents/US5182307?utm_source=gb-gplus-sharePatente US5182307 - Polyethylene terephthalate foams with integral crystalline skins
Polyethylene terephthalate foams with integral crystalline skins
