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AssigneeBaoshan Iron & Steel Co., Ltd.
InventorsLong Xie, Zhangwei Wang, Hua Ni, Xiujun Li, Hongxing Chen
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A blended polyester laminating film resistant to discoloration caused by cooking, comprising polyethylene terephthalate and polybutylene terephthalate. The blended polyester laminating film comprises three layers, i.e., upper, middle, and lower layers. One surface layer contains SiO2 in a mass fraction of 1200-2000 ppm added by in-situ polymerization. The blended polyester laminating film is manufactured by a three-layer coextrusion biaxial stretching method, and the manufacturing method is 240-275° C. A film-laminated metal sheet manufactured from the blended polyester laminating film has excellent resistance to discoloration caused by cooking, and is applied to metal containers for food and beverage packaging that require high-temperature sterilization.
A blended polyester steel-laminating film resistant to cooking discoloration, wherein the blended polyester steel-laminating film comprises polyethylene terephthalate and polybutylene terephthalate, wherein the blended polyester steel-laminating film comprises three layers including an upper layer, an intermediate layer, and a lower layer, wherein the upper layer or the lower layer comprises 1200-2000 ppm by mass of SiO2 added by in-situ polymerization, and wherein each of the upper layer, the intermediate layer, and the lower layer comprises the polyethylene terephthalate and the polybutylene terephthalate with a mass ratio from 6:4 to 4:6, and the mass ratios of the polyethylene terephthalate to the polybutylene terephthalate in each layer are the same or different.
Dependencies are inferred from the claim text.