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Thermally stable thermoplastic vulcanizate compounds

A technology of thermoplastic vulcanization and vulcanization of rubber, applied in the field of high temperature TPV, which can solve problems such as loss of structural integrity, performance limitations, and softening of thermoplastics

Inactive Publication Date: 2009-11-04
POLYONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] TPVs have previously been limited by their performance, especially under high heat conditions, where the continuous phase of the thermoplastic begins to soften and even melt, causing a loss of structural integrity

Method used

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  • Thermally stable thermoplastic vulcanizate compounds
  • Thermally stable thermoplastic vulcanizate compounds
  • Thermally stable thermoplastic vulcanizate compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9 and comparative example A-C

[0070] Table 2 shows the types of heat stabilizers used in the examples, and the phases they respectively stabilize.

[0071]

[0072] Table 3 (below) shows the formulations for Comparative Examples A-C and Examples 1-9. No cross-linking agent was added to these formulations, but these examples demonstrate that the performance of the stabilizer on each phase of the thermoplastic elastomer (TPE) can function to predict the performance of the stabilizer for both phases of the high temperature TPV of the present invention.

[0073] Table 4 shows the extruder conditions, using a 16 mm Prism twin screw extruder with all components fed through the feed ports.

[0074]

[0075] The extrudates were molded into bars suitable for ASTM tensile testing.

[0076] Table 5 shows the long-term heat aging test results.

[0077]

[0078]Surprisingly, there was no difference between the samples after the 200-day oven aging test, as no signs of sudden degradation were observed in any o...

Embodiment 10-17 and comparative example D and E

[0085] Two TPV formulations were used as controls, Comparative Examples D and E. Table 6 shows these formulations.

[0086]

[0087]

[0088] Based on the results of Examples 5, 6, 8 and 9 shown in Table 5 above, Comparative Examples D and E used the same stabilizer system as listed in Table 3, and therefore Examples 12-19 were prepared, see Table 7 below.

[0089]

[0090] Examples 10-17 and Comparative Examples D and E were all processed in a Berstorff ZE40 co-rotating twin-screw extruder. The L / D ratio of this equipment is 57, which facilitates dynamic vulcanization in one step. The EPDM compound, filler and PP are added at the feed port, the oil is injected in the fourth stage, the phenolic resin is injected in the sixth stage, and the Licowax powder is metered in the eighth stage. The prepared strands were cooled by passing them through a water bath, pelletized on a strand pelletizer, and then dried at 80° C. for 3 hours before injection molding. The processin...

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Abstract

The present invention discloses a high temperature thermoplastic vulcanizate, which achieves its long term heat aging performance from a set of heat stabilizers, at least one of which stabilizes the thermoplastic phase and at least one of which stabilizes the elstomeric phase. Plastic articles made from the high temperature thermoplastic vulcanizate are also disclosed. The thermoplastic vulcanizate can be made by melt mixing or by dynamic vulcanization in an extruder.

Description

[0001] priority statement [0002] This application claims U.S. Provisional Patent Application Serial No. 60 / 883,407 filed January 4, 2007 (Attorney Docket No. 12006025) and U.S. Provisional Patent Application Serial No. 60 / 957,495 filed August 23, 2007 (Attorney Docket No. 12007014) priority of these two patent applications are incorporated herein by reference. field of invention [0003] The present invention relates to thermally stable thermoplastic vulcanizate (TPV) compounds, also known as "high temperature TPVs". Background of the invention [0004] TPV is a class of thermoplastic elastomers (TPE). TPEs offer all the benefits of batch or continuous thermoplastic processing with the properties of elastomers. TPV by the term "vulcanizate" means a cross-linked elastomer. TPVs have a discontinuous rubber phase within a thermoplastic continuous phase. [0005] The ability to extrude or mold to produce thermoplastic articles with rubber properties makes TPV a high value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L23/00C08L21/00C08K5/00
CPCC08J3/244C08L23/16C08K2201/014C08K5/005C08L21/00C08L23/10C08L2205/02C08L2666/06
Inventor D·贾如斯
Owner POLYONE CORP