Containers with low haze
A container and haze technology, applied in the field of containers, can solve the problems of lack of transparency and high haze value
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preparation Embodiment 1-26
[0115] PET copolymer resins were prepared by the method disclosed in US Patent No. 5,612,423, the entire contents of which are incorporated herein by reference. Obtain iron particle samples with different particle sizes. Hydrogen reduced sponge iron from Pyron was used in Examples 1-10. Carbonyl iron powder obtained from ISP Technologies was used in Examples 11-26. Therefore, the iron particles used in Example 3 had a particle size ranging from about 25 to about 38 μm. It should be understood that such samples may be obtained, for example, by screening. Iron particles were added to the polyester resin using a twin-screw extruder metering feeder to obtain a resin masterbatch (iron-containing resin composition) containing 2.5% by weight of iron. Blend this masterbatch with the base resin to achieve the desired concentration. The base resin / iron mixture was vacuum dried at 325°F (163°C) for 18 hours. The dried resin was transferred to the Novotec drying hopper of a Nissei AS...
preparation Embodiment 27-32
[0125] Examples 27 to 32 were also stretched film samples prepared as above. The results are listed in Table 3. The type of iron used in Examples 27-29 was unannealed electrolytic iron with a volume based geometric mean particle size of about 10.84 μm. The iron used in Examples 30-32 was carbon monoxide reduced sponge iron with a volume based geometric mean particle size of about 18.61 μm. Although the iron concentration (ppm by weight) in the polymer is comparable, the number of particles per cubic centimeter of polymer increases with decreasing particle size, and the transmission Hunter haze / mil film thickness decreases accordingly. It should be noted that for Examples 27-32, only the side wall of the bottle was used for haze testing, not the entire bottle.
[0126] table 3
[0127] Example number
preparation Embodiment 33-44
[0129] To investigate the optimal concentration of particles of different sizes in the undrawn resin, films were prepared using a Haake mixer. 2500.0 g HiPERTUF 89010 copolyester resin was weighed into several 1 gallon containers and dried overnight at about 100° C. in a vacuum oven under full vacuum. Return the vacuum state to a nitrogen atmosphere at atmospheric pressure. An appropriate amount of carbonyl-type iron powder prepared by ISP Technologies was weighed under a nitrogen atmosphere and filled into several vials to obtain different concentrations required. Suppliers provide nominal particle sizes ranging from about 7 to about 9 μm. The iron powder had a volume-based geometric mean particle diameter of about 7.819 μm. The iron was added to the resin immediately before removing the hot resin from the oven, each vial was sealed, and the mixture was mill blended for approximately 5 minutes.
[0130] The blended mixture was fed into the hopper of a Haake Polylab extrusi...
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