| abstract |
Then the manufacturing method that the present invention provides stretched film is heated this method comprises: the unstretching film that will be used dicyclopentadiene ring-opening polymerization polymer hydrogenation products and formed is stretched to 1.2~10 times of stretching ratio in 95~135 DEG C in 150~220 DEG C.The transparency of obtained stretched film is excellent, has low linear expansion coefficient, therefore may be not only suitable for optical applications, could be applicable to electronic material. |