| 摘要 |
<p>Crack resistant, flexible waterproof tube, useful for packaging e.g. cosmetic, pharmaceutical, food or cleaning products, comprises mixed olefin polymer. Over half its axial (XX') length (H) from the end (121) of the skirt (1) remote from the head, to the end (123) of the neck (4) forms the outlet opening (3), the wall thickness is 0.30-1.00 mm. It is made from a mixed polypropylene polymer. The tube wall flexural modulus is 80-700 MPa, preferably 120-500 MPa, in accordance with the standard NF EN ISO 178. The polymer is ranked (i) in a classification of the n polymers of the mixture. These are placed in decreasing order of their moduli of flexure. The polymer is classified on a scale between a first polymer (i=1) of maximum rigidity and a second polymer (i=n) of minimal rigidity. Each polymer occurs in the mixture in accordance with a percentage xi and weight relative to the total weight of the mixture. The mixture has a dispersion factor (Kd) of the moduli of flexure, which is at most equal to 3 or to 2.2 according to whether it contains a polyethylene or not. It is preferably at least equal to 2 in either case. it is especially at least equal to 1.5. The factor of dispersion (Kd) is defined by an empirical equation provided in the disclosure. Further possible polymer contents, limiting physical properties and angular dimensions associated with the tube are detailed. An Independent claim is also included for manufacture of the tube.</p> |
