Addictive composition and articles containing the same
AssigneeMilliken & Company
InventorsJiannong Xu, Xiaodong Edward Zhao, Jiang Li, Kemper David Lake, Jr.
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Abstract
Clarified polyolefins such as polypropylene are used widely to make polymer articles, containers, and the like. Such articles may be manufactured by the injection of molten polymer into a mold or forming device in manufacturing processes at high rates. A clarified composition is provided to achieve optimized clarity and organoleptic performance at lower processing temperatures and/or within a polypropylene resin having a higher melt flow rate.
Claims9
A polyolefin article made by the process comprising:
- (a) providing a polypropylene resin, said polypropylene resin having an MFR value of at least 20 as measured by ASTM 1238-04;
- (b) providing a first compound comprising bis(3,4-dimethylbenzylidene) sorbitol;
- (c) providing a second compound comprising dibenzylidene sorbitol;
- (d) mixing said first and second compounds with said polypropylene resin, wherein said bis(3,4-dimethylbenzylidene) sorbitol comprises about 15 to about 60 percent of the combined total weight of bis(3,4-dimethylbenzylidene) sorbitol and dibenzylidene sorbitol mixed with said polypropylene resin;
- (e) forming said polypropylene resin at a temperature of less than 200 degrees C;
- and
- (f) making a polypropylene article.
A method for reducing haze in a polypropylene resin composition, said method comprising the steps of:
- (a) providing a polypropylene resin having an MFR value of at least 20 as measured by ASTM 1238-04;
- (b) combining with said polypropylene resin a first compound comprising bis(3,4-dimethylbenzylidene) sorbitol and a second compound comprising dibenzylidene sorbitol, thereby forming a nucleated polypropylene resin, wherein said bis(3,4-dimethylbenzylidene) sorbitol comprises about 15 to about 60 percent of the combined total weight of bis(3,4-dimethylbenzylidene) sorbitol and dibenzylidene sorbitol combined with said polypropylene resin;
- (c) forming said nucleated polypropylene composition into a plastic article at a temperature no greater than 200 degrees C.
An additive composition comprising:
- (a) a first compound comprising bis(3,4-dimethylbenzylidene) sorbitol;
- and
- (b) a second compound comprising dibenzylidene sorbitol;
- and
- (c) a vis-breaking agent, wherein said vis-breaking agent is capable, when applied with (a) and (b) into a polyolefin resin of breaking the viscosity of the resin to increase the melt flow rate (MFR) of the resin.
Dependencies are inferred from the claim text.