Disposable containers coated with a latex coating
a technology of latex coating and dispersible containers, which is applied in the field of disposable containers, can solve the problems of stains appearing on the outer surface of the container, liquids, hot liquids, etc., and the container, especially those made from eps particles, have a tendency to leak, and achieve the effect of reducing or eliminating leakag
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example 1
[0063] This example illustrates the preparation of latex coated containers. Expandable polystyrene cup beads (DYLITE® beads from NOVA Chemicals, Inc., which comprise polystyrene and pentane) were blended with zinc stearate and pre-expanded in an 11-gallon (about 1.5 cubic foot) Rodman Steam pre-expander (Artisan Industries Inc.) at atmospheric pressure. The pre-expansion was operated batch wise. 3.5 pounds of cup beads having a diameter distribution of about 0.008 inches to about 0.02 inches were used to make pre-puff with a density of about 3.5 pounds per cubic foot. The newly prepared pre-puff was air dried for 5 minutes to remove the moisture and aged for about 4 hours before molding.
[0064] Sixteen-ounce cups were molded from the aged pre-puff beads. The steam header pressure was 80 pounds per square inch and the total cycle time was in the range of 6 to 15 seconds. The molded foam cups were allowed to age overnight.
[0065] Latex (Roymal 45526 product manufactured and marketed b...
example 2
[0071] The EPS cups were 6 ounce cups. The oil retention test (ATF) for these EPS cups having a pre-puff density of 3.5 pounds per cubic foot was performed in a manner similar to that for Example 1.
[0072] The type of latex coating was the same as that used in Example 1. The coating was first diluted with water to produce coatings with varying solids content. The molded foam cups were coated via a dip coating process with the diluted latex so that both the inner and the outer surfaces of the cups were coated. The coated cups were dried at room temperature overnight before being tested. The results are shown in Table 2.
[0073] The cups with the latex coating have an increased ATF compared to those cups without the latex coating (control).
TABLE 2CoatingThickness6.0μ9.0μ12.0μSolid—8.0812.1316.17content (%)ATF (hr)0.8316.44848RemarkControl
example 3
[0074] The procedure of Example 1 was repeated except the testing method was replaced by the following method.
[0075] Four coated cups were tested by the following method: 1) Oil fried pre-shaped cup noodles, such as those available in the market, were placed in each cup. 2) Three grams of red pepper powder were spread evenly onto the noodle surfaces. 3) Each cup was tightly sealed with an adhesive label and plastic stretch film, and placed in the oven at a temperature of 149° F. (65° C.). 4) Each sample was checked for stains first every hour during a 7 hour period and then once every 8 hours until failure for a total of 72 hours or 3 days.
[0076] The average time to failure (ATF) was calculated similar to that set forth in Example 1. The maximum ATF value of 72 hours represents that none of the cups for the cup group sampling exhibited any stain or leakage. The minimum ATF value of 1 hour represents that all of the cups in the cup group sampling failed within the first 1 hour.
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