| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a composite film, which exhibits little variation in fracture strength when the composite film is elongated, and can decrease the stress generated in 20%-elongation. <P>SOLUTION: The method for manufacturing a composite film includes a step of preparing a reference mixture containing a urethane polymer and at least one acrylic monomer, a step of adding ≥0.01 pts.wt. and ≤5 pts.wt. of a chain transfer agent based on 100 pts.wt. of the reference mixture to prepare an added mixture, and a step of curing the added mixture to form the composite film, wherein the elongation fracture strength S2 of the composite film P2 obtained by curing the added mixture is ≥85% and ≤115% of the elongation fracture strength S1 of a composite film P1 obtained by curing the reference mixture; and the stress M2 when the composite film P2 is elongated by 20% is ≤90% of the stress M1 when the composite film P1 is elongated by 20%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
