Patent ID: 9574047
Date: 2017-02-21
CPC Classifications: B32B,B65C,C08G,C08J,C08L,Y10T

Claim:
1. A heat-shrinkable polyester film having a heat shrinkage initiation temperature of 60° C. or lower, a glass transition temperature (Tg) of 77° C. or lower and a heat shrinkage rate of 2% or more at 60° C., wherein the film has a heat shrinkage rate of 15% or more at 65° C., 42% or more at 70° C., and 70% or more at 80° C.; wherein the film is prepared by random-copolymerization of one kind of a dibasic acid component with three kinds of diol components; wherein the dibasic acid component (A1) is one of terephthalic acid and dimethyl terephthalate; and wherein the diol components are (B1) ethylene glycol, (B2) one of neopentyl glycol and cyclohexanedimethanol, and (B3) a linear diol component having three or more carbon atoms at a main chain thereof.