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Dynamic seals, compositions, and methods of making the same

a technology of dynamic seals and compositions, applied in the field of compositions, can solve the problems of increasing the cost of materials, limited sealing performance, and high material costs

Inactive Publication Date: 2018-06-14
COOPER STANDARD AUTOMATIVE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a sponge sealing member made of a foamed silane-crosslinked elastomer with a low density and a low compression set. The sponge sealing member is made by blending a polyolefin with a silane crosslinker and a foding agent. The invention also provides a silane-crosslinked polyolefin blend that includes a first polyolefin, a second polyolefin, a silane crosslinker, and a fooding agent, which exhibits a compression set of 5.0% to 35.0%. This sponge sealing member has excellent properties, such as low density and high elasticity, which make it useful in various applications such as sealing and insulation.

Problems solved by technology

TPVs are relatively easy to process, but sealing performance can be limited in terms of resilience or sealing ability over time and material costs tend to be high.
Similarly, EPDM rubber formulations often require many ingredients (e.g., carbon black, petroleum-based oil, zinc oxide, miscellaneous fillers such as calcium carbonate or talc, processing aids, curatives, blowing agents, and many other materials to meet performance requirements), which tend to increase their material cost.
EPDM-based seals are also costly from a process stand point.
Hence, the extrusion process used to manufacture weatherstrips can include many stages, depending on the type of EPDM or other types of resins, and may additionally require long lengths of curing ovens.
Overall, the processes used to fabricate these traditional EPDM-based seals can be very time consuming, costly, and environmentally unfriendly.

Method used

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  • Dynamic seals, compositions, and methods of making the same
  • Dynamic seals, compositions, and methods of making the same
  • Dynamic seals, compositions, and methods of making the same

Examples

Experimental program
Comparison scheme
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example 1

[0126]Example 1 (Ex. 1) or ED108-2A was produced by extruding 48.70 wt % ENGAGE 8842 and 48.70 wt % XUS38677.15 together with 2.6 wt % SI LAN RHS 14 / 032 or SILFIN 13 to form a silane-grafted polyolefin elastomer. The Example 1 silane-grafted polyolefin elastomer was then extruded with 1.7 wt % Hydrocerol 1170 foaming agent, 2 wt % Ambicat LE4472 condensation catalyst, and 360 ppm dioctyltin dilaurate (DOTL) condensation catalyst to form a silane-crosslinkable polyolefin elastomer, which was then extruded into an uncured dynamic sealing member. The Example 1 silane-crosslinkable polyolefin elastomer of the uncured dynamic sealing member was then cured at ambient temperature and humidity to form a silane-crosslinked polyolefin elastomer, consistent with the elastomers of the disclosure. The composition of Example 1 is provided in Table 1 below and its material properties are provided in Table 2 below.

example 2

[0127]Example 2 (Ex. 2) or ED108-2B was produced by extruding 48.70 wt % ENGAGE 8842 and 48.70 wt % XUS38677.15 and 2.6 wt % SILAN RHS 14 / 032 or SILFIN 13 together with Exact 9061 / SpectraSyn 10 (70 / 30) to form the silane-grafted polyolefin elastomer. The Example 2 silane-grafted polyolefin elastomer was then extruded with 1.7 wt % Hydrocerol 1170 foaming agent, 2 wt % Ambicat LE4472 condensation catalyst, and 360 ppm dioctyltin dilaurate (DOTL) condensation catalyst to form a silane-crosslinkable polyolefin elastomer, which was then extruded into an uncured dynamic sealing member. The Example 2 silane-crosslinkable polyolefin elastomer of the uncured dynamic sealing member was then cured at ambient temperature and humidity to form a silane-crosslinked polyolefin elastomer, consistent with the elastomers of the disclosure. The composition of Example 2 is provided in Table 1 below and its material properties are provided in Table 2 below. Also provided below in Table 2 are properties ...

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Abstract

A sponge sealing member is provided that includes a composition having a silane-crosslinked polyolefin elastomer with a density less than 0.60 g / cm3. The sponge sealing member can exhibit a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.). The silane-crosslinked polyolefin elastomer can also include a first polyolefin having a density less than 0.86 g / cm3, a second polyolefin having a crystallinity less than 40%, a silane crosslinker, a grafting initiator, a condensation catalyst, and a foaming agent.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 62 / 497,954 filed Dec. 10, 2016, entitled “WEATHERSTRIP, COMPOSITION INCLUDING SILANE-GRAFTED POLYOLEFIN, AND PROCESS OF MAKING A WEATHERSTRIP,” which is herein incorporated by reference in its entirety.FIELD OF THE DISCLOSURE[0002]The disclosure generally relates to compositions that may be used to form dynamic seals, and more particularly, to compositions used to form dynamic seals in vehicles and methods for manufacturing these compositions and seals.BACKGROUND OF THE DISCLOSURE[0003]The motor vehicle industry is continuously manufacturing and developing sealing elements and sections having low friction and abrasion resistance properties. These elements and sections can be extruded from certain polymeric materials. One example of an extruded abrasion-resistant section is a dynamic seal. Dynamic seals, such as weatherstrips, are typically ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/08C08K3/36C08K3/011C08J9/228
CPCC08L23/12C08L23/0815C08K3/36C08K3/011C08J9/228C08F2500/21C09K3/10C09K2003/1068C09K2200/0494C09K2200/062C08J3/24C08K5/5415C08K5/0025C08L23/16C08J2351/06C08J2423/08C08J2423/14C08L2312/08C08L51/06C08L2205/03C08J9/04C08F255/02C09K2200/0685C08J2423/12C08L2205/025C08L23/142C08J9/0061C08L23/14
Inventor GOPALAN, KRISHNAMACHARILENHART, ROBERT J.JI, GENDINGHERD-SMITH, ROLAND
Owner COOPER STANDARD AUTOMATIVE INC