Heat shrinkable polyester film

Heat shrinkable polyester film

  • CN 102,190,867 B
  • Filed: 03/08/2011
  • Issued: 10/21/2015
  • Est. Priority Date: 03/09/2010
  • Status: Active Grant
First Claim
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1. a heat shrinkable polyester film, it has along main shrinkage direction every degree Celsius thermal contraction change, its unit be %/DEG C, 1.5 ~ 3.0 are changed at 60 DEG C ~ 70 DEG C, 2.5 ~ 3.5 are changed at 70 DEG C ~ 80 DEG C, change into 1.0 ~ 2.0 at 80 DEG C ~ 90 DEG C, and change into 0.1 ~ 1.0 at 90 DEG C ~ 100 DEG CWherein said heat shrinkable polyester film is prepared by polyester composition, and this polyester composition obtains by following component is carried out copolymerization:

  • (i) dibasic acid component, take dibasic acid component as 100mol%, it contains at least 90mol% terephthalic acid group;

    With(ii) diol component, take diol component as 100mol%, it contains (a) 3 ~ 16mol% glycol ether, (b) 5 ~ 30mol% neopentyl glycol, and (c) 50 ~ 90mol% ethylene glycol,Wherein, when described heat shrinkable polyester film processes 10 seconds in the hot water of 90 DEG C, have the percent thermal shrinkage of 58% or larger along main shrinkage direction, the shirt rim ratio (S/R) shown in formula (I) is≤

    11%, and maximum collapse stress is≤

    6N;

    Shirt rim ratio (%)=(W-d)/L x 100 (I)Wherein, L is the length of film along main shrinkage direction, and W is the width before film shrunk, and d is the width after film shrunk;

    The limiting viscosity of wherein said polyester composition is 0.6 ~ 0.9dl/g.

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