A molding having a high transparency and a surface hardness of B or higher in terms of pencil hardness, is provided by blow molding process employing no orientation step. A high-hardness transparent polyester molding, obtained by quenching and carrying out non-orientation blow molding of a polyester...http://www.google.co.uk/patents/US5518791?utm_source=gb-gplus-sharePatent US5518791 - High-hardness transparent polyester moldings
