US 2003/0165658 A1Published application

Heat-shrinkable polyester film roll and process for producing the same

AssigneeToyo Boseki Kabushiki Kaisha

InventorsSatoshi Hayakawa, Norimi Tabota, Yoshinori Takegawa, Katsuya Ito, Shigeru Komeda, Katsuhiko Nose

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Abstract

A film roll of a heat-shrinkable polyester film characterized in that the heat-shrinkable polyester film meets the following requirements (1) and (2). (1) When samples are cut off therefrom at an almost equal interval along the longitudinal direction, and immersed in hot water at 85° C. for 10 seconds, subsequently in water at 25° C. and withdrawn, heat-shrinkage percentages in the maximum shrinkage direction of all the samples are 20% or more. (2) When raw polymers used for production of the film above comprises of a major constitutional unit and one or more sub constitutional units different therefrom; and the content of the primary sub constitutional unit is determined, the content of the primary sub constitutional unit in each sample is more than 7 mole % in 100% of all constitutional units, and when an average of the contents of the primary sub constitutional unit is calculated, the contents thereof of all the samples fall within a range of ±2 mole % relative to the average.

Claims13

Dependent claims

A film roll of a heat-shrinkable polyester film, the heat-shrinkable polyester film meeting the following requirements (1) and (2):

(1) when an initiation end of winding of a film which is obtained from a steady region where physical properties of the film are stabilized in a longitudinal direction is designated as a first end;
a termination end of winding thereof is designated as a second end;
a first cut-off point of samples of the film is provided at a position 2 m or less inner from the second end,
a final cut-off point of the samples is provided at a position 2 m or less inner from the first end;
and
a plurality of additional sample cut-off points are provided at an interval of about 100 m from the first cut-off point,
the samples being square samples in a size of 10 cm×10 cm cut off from each of the cut-off points,
all the samples have a heat shrinkage percentage of 20% or more in the maximum shrinkage direction after the respective samples are immersed in hot water at 85° C. for 10 seconds, subsequently in water at 25° C. for 10 seconds, and withdrawn.
(2) when a raw polymer used for production of the film comprises a major constitutional polymer and one or more sub constitutional units different therefrom;
and
the sub constitutional unit which is present in the greatest amount among all the sub constitutional units is designated as a primary sub constitutional unit,
the content of the primary sub constitutional unit in the each sample properly cut off from each of the cut-off points described in the requirement (1) is 7 mole % or more in 100 mole % of all the constitutional units,
and when an average of the content of the primary sub constitutional unit is calculated, the contents thereof of all the samples fall within a range of ±2 mole % relative to the average content.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/221,645Filed 16 Sep 2002
Priority: JP 200113014726 Apr 2001
Published: 4 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
B29C 61/003
Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor: characterised by the choice of material
B29C 55/00
Shaping by stretching
B29K 2067/00
Use of polyesters or derivatives thereof, as moulding material