| 摘要 |
A cup-type polypropylene container obtained by compression-molding a polypropylene and having at least a body portion and a bottom portion, wherein the body portion has a thickness of not larger than 1.0 mm and a value K 1 represented by the following formula (1), K 1 = P 1 / P 2
wherein P 1 and P 2 are, respectively, a peak intensity at a diffraction angle 2¸ = 14.5° and a peak intensity at a diffracton angle 2¸ = 17.2° in the peak intensity distribution in the x-direction of a Debye ring obtained by measuring the diffraction intensity while defining the circumferential direction of a test piece cut out from the body portion of the container to be x, the direction of height thereof to be y, and by causing x-ray to fall perpendicularly to the xy-plane of the test piece,
lying in a range of 0.5 to 1.0 and/or a value K 2 represented by the following formula (2), K 2 = H �¢ ² 1 / H �¢ ² 1 + H �¢ ± 1 + H �¢ ± 2 + H �¢ ± 3
wherein H² 1 , H± 1 , H± 2 and H± 3 are values obtained by subtracting the diffraction intensity of an amorphous portion from a peak intensity at a diffraction angle 2¸ = 16.3°, from a peak intensity at a diffraction angle 2¸ = 14.5°, from a peak intensity at a diffraction angle of 17.2° and from a peak intensity at a diffraction angle of 18.8° in the peak intensity distribution in the x-direction of a Debye ring obtained by measuring the diffraction intensity while defining the circumferential direction of a test piece cut out from the body portion of the container to be x, the direction of height thereof to be y, and by causing x-ray to fall perpendicularly to the xy-plane of the test piece,
which is larger than 0 in at least part of the body portion. The cup-type polypropylene container features improved falling strength in the body portion and at the open end such as flange, improved pressure strength and excellent mechanical strength in the body portion. |
