Patent ID: 9028952
Filing Date: 2015-05-12
Classification: B32B,C08G,C08L,H01L,Y02E,Y10S,Y10T

Abstract:
1. A weatherable film for a solar cell, consisting of: a hard layer and a soft layer laminated and alternately stacked in a multilayer form with said hard layer and said soft layer each contained in said multilayer form multiple times, wherein the hard layer consists essentially of a polyester or copolyester polymer resin having a crystallinity of 75-95% and the soft layer consists essentially of a polybutylene terephthalate glycol copolymer containing 10-60wt % of polytetramethylene ether glycol; wherein the hard layer and the soft layer have a weight ratio (an extrusion rate ratio, kg/hr) of 0.1-100:1; wherein the film has been extruded and stretched 1.5-5.0 times in a longitudinal direction and a transverse direction; wherein the film has a thickness of 5-700 μm; wherein the film has an elongation change rate of 20-90% in a hydrolysis resistance test; and wherein the film has a visible transmittance of 80-95% and a haze of 0.1-5%.