Back to results
US 2007/0178326 A1Published application
Thermo-shrinkable polyester film
AssigneeKolon Ind. Inc./Kr
InventorsKi Il HONG, Gi Sang SONG
Life of this patent
Estimating the term…
Abstract
The present invention relates to a thermo-shrinkable polyester film with a superior thermal shrinkage, which has an orientation angle of a molecular chain in a range of from 0° to about ±10° relative to a main shrinkage direction, and a molecular orientation ratio (MOR) in a range of from 1.29 to about 2.5, thereby preventing a label made from the film from curling or waving.
Claims22
A thermo-shrinkable polyester film having an orientation angle of a molecular chain of the film in a range of from 0° to about ±10° relative to a main shrinkage direction;
- and
- a molecular orientation ratio (MOR) represented by the following Formula 2 in a range of from about 1.29 to about 2.5, wherein the orientation angle of the molecular chain is a rotation angle (θ) at which a microwave transmit intensity, I(θ), has a maximum value, the microwave transmit intensity being determined by the following Formula 1:
- I(θ)=Io(θ)/[Iav+Q2{W(θ)/Wo(θ)−Wo(θ)/W(θ)}2], Formula 1
- Molecular orientation ratio(MOR)=Imax/Imin, Formula 2
- wherein, I(θ) is a microwave transmit intensity at a rotation angle θ;
- Io is a microwave transmit intensity at a resonance point;
- Iav is a mean microwave transmit intensities measured at each degree of rotation angles of 360 degrees;
- Wo is a resonance angular frequency;
- W is an angular frequency;
- θ is a rotation angle;
- Q is a ratio of a resonance angular frequency to a half-wave width of a resonance curve (Wo/ΔW);
- Imax is a maximum value of microwave transmit intensity;
- and Imin is a minimum value of microwave transmit intensity.
10 more elements
A process for prepare a thermo-shrinkable polyester film, which comprises:
- (a) extruding a polyester polymer composition at a temperature of about 200-350° C.;
- and
- (b) stretching a resulting extruded polyester film 3.0-5.0 times in one direction at a temperature of between a glass transition temperature (Tg) of the extruded polyester film and Tg+about 30° C. to give the thermo-shrinkable polyester film,
- wherein the thermo-shrinkable polyester film has an orientation angle of a molecular chain of the film in a range of from 0° to about ±10° relative to a main shrinkage direction;
- and a molecular orientation ratio (MOR) represented by the following Formula 2 in a range of from about 1.29 to about 2.5, wherein the orientation angle of the molecular chain is a rotation angle (θ) at which a microwave transmit intensity, I(θ), has a maximum value, the microwave transmit intensity being determined by the following Formula 1:
- I(θ)=Io(θ)/[Iav+Q2{W(θ)/Wo(θ)−Wo(θ)/W(θ)}2], Formula 1
- Molecular orientation ratio(MOR)=Imax/Imin, Formula 2
- wherein, I(θ) is a microwave transmit intensity at a rotation angle θ;
- Io is a microwave transmit intensity at a resonance point;
- Iav is a mean microwave transmit intensities measured at each degree of rotation angles of 360 degrees;
- Wo is a resonance angular frequency;
- W is an angular frequency;
- θ is a rotation angle;
- Q is a ratio of a resonance angular frequency to a half-wave width of a resonance curve (Wo/ΔW);
- Imax is a maximum value of microwave transmit intensity;
- and Imin is a minimum value of microwave transmit intensity.
13 more elements
Dependencies are inferred from the claim text.