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US 9,315,667 B2Granted
Stretched polyamide film
AssigneeToyobo Co., Ltd.
InventorsToshiyuki Shimizu, Yoshinori Miyaguchi, Takuro Endo, Akinobu Nagara
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Abstract
The invention provides a stretched polyamide film with a main constituent that is nylon 6. At least one surface layer of the polyamide film satisfies conditions (1) and (2), and the stretched polyamide film satisfies condition (3), which pertain to an orientation factor, an intensity ratio of absorption, and a heat shrinkage rate, respectively, as defined herein.
Claims15
A stretched polyamide film, wherein a main constituent is nylon 6;
- at least one surface layer satisfies the following conditions (1) and (2);
- and
- the stretched polyamide film satisfies the following condition (3):
- (1) an orientation factor:
- 2Kz/(Kx+Ky) defined by the absorption coefficients of the machine direction Kx, the transverse direction Ky, and the thickness direction Kz, respectively, of the bending vibration of the amide bond NH in the spectrum determined by FT-IR polarized attenuated total reflection (ATR) measurement is within a range of not less than 0.3 and not more than 0.5;
- (2) an intensity ratio of absorption at 1200 cm−1 to absorption at 1370 cm−1 (1200 cm−1 /1370 cm−1) determined by FT-IR polarized ATR measurement is within a range of not less than 1.0 and not more than 1.4;
- (3) a heat shrinkage rate (%) in the transverse direction is within a range of not less than 0.6 and not more than 4 when measured in accordance with JIS C2318 except at 160° C. for a heating period of 10 minutes.
4 more elements
Dependencies are inferred from the claim text.