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Low density foamed thermoplastic vulcanizate compositions

A thermoplastic vulcanization, rubber composition technology, applied in thermoplastic vulcanized rubber composition, weather strip and other automotive parts, glass run fields, can solve the problems of low TPV strength, tearing, roughness and so on

Inactive Publication Date: 2020-09-01
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in automotive applications such as weathering strips, seals, or glass run channels, while a lower density (and thus lighter) TPV would provide the desired weight savings, foaming to a lower density can render the TPV less dense for the intended purpose. Too low strength, too rough and / or too easy to tear when deformed

Method used

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  • Low density foamed thermoplastic vulcanizate compositions
  • Low density foamed thermoplastic vulcanizate compositions
  • Low density foamed thermoplastic vulcanizate compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] Two TPV compositions were prepared by dynamic vulcanization in a twin-screw extruder using the ingredients indicated in Table 1.1.

[0170] Table 1.1 Example 1 TPV

[0171]

[0172] *Due to rounding in significant figures the total weight % is 99.7

[0173] "Rubber" is Vistalon TM 3666 EPDM rubber, which is an ethylene-propylene-diene rubber with 64.0% by weight ethylene content (ASTM D3900) and 4.5% by weight ENB diene content (ASTM D6047). V3666 is an oil extender with an oil of 75 phr and has an oil extender Mooney viscosity of 52 MU (ML 1+4, 125°C, ASTM D1646). V3666 is commercially available from ExxonMobil Chemical Company, Houston, Texas. The weight percents reported in Table 1 are for oil-extended rubber, ie they include both rubber and extender oil.

[0174] "PP" is ExxonMobil TM PP5341 polypropylene, which is a polypropylene homopolymer with a density of 0.9 g / cc and a MFR of 0.83 g / 10 min (ASTM D1238; 230° C. and 2.16 kg weight). PP5341 is commerci...

Embodiment 2

[0195] Another sample TPV (TPV-3) was made by dynamic vulcanization in a twin screw extruder with the following ingredients:

[0196] Table 2.1 Example 2 TPV composition

[0197]

[0198] Each component in Table 2.1 is as described in Table 1.1 for Example 1.

[0199] The TPV composition TPV-3 was coextruded with MBFN-190SSPE heat-expandable microsphere masterbatch (the same product used in Example 1) in a 91 / 9 weight ratio (TPV to microsphere masterbatch) to form a part of the glass run profile GRC-6. Additionally, Sample 2 and Sample 6 foamable TPV compositions from Example 1 were also formed into GRC profiles (GRC-1 to GRC-5) by coextrusion with MBFN-190 SSPE, as reported in Table 2.2 below. As set forth in Table 1.1, Sample 2 was made by combining 100 parts of TPV-1 with 30 parts of HMSPP-2; and Sample 6 was made by combining 100 parts of TPV-2 with 50 parts of HMS PP-2. The density of the expanded part of each GRC profile is also reported in Table 2.2.

[0200] The...

Embodiment 3

[0206] A foamable TPV composition was formed by compounding the following ingredients in a twin-screw extruder.

[0207] Santoprene TM 101-87 is a thermoplastic vulcanizate commercially available from ExxonMobil Chemical Co. having a density (according to ASTM D792) of 0.95 g / cc and a Shore A hardness (according to ISO 868 at 15 seconds and 23°C) of 94, Compression Set Type 1 (according to ASTM D395B) 37% 22 hours Type A at 70°C and 52% 70 hours Type A at 125°C. Santoprene TM 103-40 is a thermoplastic vulcanizate commercially available from ExxonMobil Chemical Co. having a density (according to ASTM D792) of 0.95 g / cc and a Shore D hardness (according to ISO 868 at 15 seconds and 23°C) of 41, Compression Set Type 1 (according to ASTM D395B) 54% Type A at 22 hours at 70°C and 61% Type A at 70 hours at 125°C. Santoprene TM 9101-80E is a thermoplastic vulcanizate commercially available from ExxonMobil Chemical Co. having a density (according to ASTM D792) of 0.97 g / cc and a S...

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Abstract

The present disclosure relates to TPV compositions suitable for foaming, as well as foamed TPV compositions, methods of making the foregoing, and applications of various foamed TPV compositions, including in glass run channels. The TPV compositions comprise an at least partially vulcanized rubber component dispersed within a thermoplastic component comprising a first thermoplastic resin. Accordingto some aspects, the TPV composition may be combined with a high melt-strength thermoplastic resin, and in particular a high melt-strength polypropylene-based thermoplastic resin, to make a foamableTPV composition. The foamable TPV composition (with or without high melt-strength thermoplastic resin) is then coextruded or otherwise combined with foaming agent (preferably comprising thermo-expandable microspheres) to form the foamed composition. Foamed compositions according to various aspects are suitable for use in glass run channels for automobiles, and in particular in the base and / or sidewall portions of such glass run channels.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to U.S. Provisional Application No. 62 / 595,154, filed December 6, 2017, which is incorporated herein by reference. [0003] field of invention [0004] The present invention relates to foamed articles made using thermoplastic vulcanizate compositions, and in particular to glass run channels, weather strips and other automotive parts made at least in part using foamed thermoplastic vulcanizate compositions. The present invention also relates to thermoplastic vulcanizate compositions suitable for foaming, and other potential applications of such compositions. [0005] Background of the invention [0006] Thermoplastic elastomers (TPE) are both elastomeric and thermoplastic. They are distinguished from thermoset rubbers (which are elastomeric, but not thermoplastic due to crosslinking or vulcanization of the rubber), and from general thermoplastic materials (which are general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16
CPCC08L2207/322C08L23/12C08L23/16C08L2205/025C08L2205/03C08L2205/18C08L2205/22C08L2207/04C08L91/00C08J9/228C08J2203/22C08J2323/16C08J2423/12
Inventor 励亮山口利昭张韦倩鲍培特倪一萍E·P·乔尔丹
Owner CELANESE INT CORP