Claims
- 1. A method of producing a nucleated polyolefin composition comprising the steps of
- (a) providing a liquid dispersion of a polyolefin nucleating agent comprising
- at least one dibenzylidene sorbitol acetal derivative; and
- at least one nonionic surfactant;
- (b) introducing said liquid dispersion into a molten polyolefin composition, thereby producing a mixture of polyolefin and nucleating agent;
- (c) extruding said mixture of polyolefin and nucleating agent; and
- (d) allowing said extruded mixture of polyolefin and nucleating agent to cool.
- 2. The method of claim 1 wherein said nonionic surfactant is ethoxylated and possesses a HLB balance greater than about 8.5.
- 3. The method of claim 2 wherein said ethoxylated nonionic surfactant is selected from the group consisting of ethoxylated sorbitan (C.sub.8 -C.sub.22) monoesters, ethoxylated nonylphenol ethers, ethoxylated octylphenol ethers, and any mixtures thereof, and is present in amount of at least about 60% by weight of the total composition.
- 4. The method of claim 1 wherein said dibenzylidene sorbitol acetal derivative is 1,3:2,4-di(3,4-dimethyldibenzylidene) sorbitol.
- 5. The method of claim 2 wherein said ethoxylated nonionic surfactant has an HLB between about 9.0 and about 17.0, and is present in an amount of at least about 70% by weight of the total composition.
- 6. The method of claim 5 wherein said ethoxylated nonionic surfactant has an HLB between about 9.5 and about 14.5.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application 09/148,170, filed on Sep. 4, 1998, now allowed as U.S. Pat. No. 6,102,999. This parent application is herein entirely incorporated by reference.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
Country |
Parent |
148170 |
Sep 1998 |
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