Polymer compositions comprising nucleating or clarifying agents
A kind of composition, nucleating agent technology, applied in the field of polymer composition
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Embodiment 1
[0064] This example demonstrates the changes in thermal and optical properties exhibited by the polymer compositions described herein. Four samples (1A-1D) were prepared using four commercially available polyethylene resins compounded with about 2.0 wt% (based on the total weight of the polymer composition) of a masterbatch containing about 10 wt% (based on the masterbatch The commercially available 1,3:2,4-bis(3,4-dimethylbenzylidene) sorbitol nucleating agent (the total weight of the feed) ( 3988, available from Milliken Chemical) and approximately 90% by weight (based on the total weight of the masterbatch) of random copolymer polypropylene. Therefore, each compounded polymer composition included 0.2 wt% 1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol nucleating agent and 1.8 wt% random copolymer propylene.
[0065] Compounded samples were injection molded into 50 mil plaques using an Arburg 40-ton injection molding machine. After storing the molded sheets for at least 12 ...
Embodiment 2
[0073] manufacture of cups
[0074] A series of cups with an average weight of approximately 20 g and a nominal wall thickness of 25 mils (0.025 inches) were produced using a Husky S-90 injection molding machine. The polymer composition used to produce the samples contained approximately 2% by weight (based on the total weight of the composition) of the masterbatch described in Example 1 and 2% by weight of the masterbatch described in Example 9.
Embodiment 3
[0076] A third set of cups (Samples 3A-3B) was produced by the same method as in Example 2. The polymer composition used to produce the cups included a control (sample 3A), which included a commercially available HDPE resin, and a polymer resin according to the invention (sample 3B), which included the same HDPE resin and 2.5 wt % (based on the total weight of the polymer composition) of a masterbatch comprising 4 wt% (based on the total weight of the masterbatch) of commercially available bicyclo[2.2.1]heptane-2,3-dicarboxylate Disodium acid nucleating agent ( HPN-68L, available from Milliken Chemical) and 96 wt% homopolypropylene.
[0077] After storage for at least 12 hours, the samples were evaluated using the BYK Gardner Haze-Gard Plus to determine haze and clarity.
[0078] Table 4. Optical Properties of Samples 3A-3B.
[0079] sample
[0080] As can be seen from the data shown in Table 4, the cups produced using the polymer composition of the present inven...
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