| 摘要 |
PROBLEM TO BE SOLVED: To improve impact resistance, compression resistance and the external appearance of a molding by forming a bobbin with a thermoplastic rein composition made of a crushed object and multi-layer structure polymer grains. SOLUTION: A PET bottle is a representative one, but not limited, as a molding made of a thermoplastic polyester resin used in the form of a crushed object. A flake shape is generally used for the form of the crushed object. The average grain size is preferably set to 3-20 mm, and the average thickness is preferably set to 100-700μm. The crushed object is formed into pellets for use. Each multi-layer structure polymer grain has a hard layer as the outermost layer and a rubber layer inside it. The rubber layer is a polymer layer having glass transition point temperature Tg of 25 deg.C or below, and the hard layer is a polymer layer having the temperature Tg higher than 25 deg.C. The grain has an inner layer/outer layer structure that the inner layer is covered with the outer layer, and it may be formed with two layers, three layers or four or more layers.
|
