Thermoplastic elastomer film and its manufacturing method

A technology of elastomers and thermoplastic resins, applied in chemical instruments and methods, other household appliances, transportation and packaging, etc., can solve problems such as the influence of dispersed elastomer particles

Active Publication Date: 2019-01-25
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the case of DVA materials, although the material can exhibit some conventional thermoplastic characteristics, the dispersed elastomer particles affect the ability to employ conventional thermoplastic processing techniques
Applicants have discovered that when thermoplastic film is extruded using conventional techniques to fix the film width, the film experiences an aging shrinkage of greater than 3%

Method used

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  • Thermoplastic elastomer film and its manufacturing method
  • Thermoplastic elastomer film and its manufacturing method
  • Thermoplastic elastomer film and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment approach

[0072] A. A method of forming a dynamically vulcanized alloy film, the method comprising i) extruding a dynamically vulcanized alloy through at least one extruder die discharge orifice to form an extruded film having an extrusion die exit film temperature, the dynamically vulcanized alloy comprising at least one elastomer dispersed in continuous thermoplastic resin domains, ii) causing air to flow over the extruded film to reduce the temperature of the extruded film and create a film bloom line, and iii) moving the film through The film frost line to complete the film forming process; wherein the temperature of the extruded film is lowered at a cooling rate of less than 97° C. per second and the film frost line of the extruded film is within a distance of at least one extruder die row It is generated at the position where the material hole is larger than 135mm;

[0073] B. The method of embodiment A, wherein the cooling rate is less than 90°C per second, or less than 75°C per ...

Embodiment

[0097] DVA pellets for film extrusion were prepared in a twin-screw extruder. The DVA-forming components and amounts are identified in Table 1 below, respectively.

[0098] Table 1

[0099]

[0100] Pellets are prepared for film blowing by masticating the pellets in a screw extruder to bring the material to the desired extrusion temperature. Film thickness, air pressure values, and the die gap were varied to determine the effect of extrusion parameters on film bloom line and undercooling, as well as the shrinkage characteristics of the resulting aged films. The extrusion rate for the entire run was 71 kg / hr and for the values ​​in Table 2 below, the film fold-flat bubble width was 610 mm, resulting from a bubble diameter of approximately 410 mm. This data is presented in Table 2 below.

[0101] Reviewing the above data, for the two thickest gauges, 200 microns, the aged film shrinkage was the lowest. This may be due to the greater thickness of the thermoplastic domains ...

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Abstract

A method of forming a film of a dynamically vulcanized alloy comprising at least one elastomer dispersed in domains of a thermoplastic resin, wherein the film is characterized by low shrinkage after completion of extruded film formation. The film has a film shrinkage of less than 1.5 percent, measured no earlier than 96 hours after film formation, relative to the film width measured immediately after film formation. During film formation, the extruded film is subjected to a cooling rate of less than 97° C. per second and the extruded film has a frost line greater than 135 mm.

Description

[0001] Inventor: Hari Nadella [0002] priority [0003] The present invention claims priority and benefits from US Patent Application Serial No. USSN 62 / 005,226 filed on May 30, 2014 and European Patent Application No. EP14181532.4 filed on August 20, 2014. technical field [0004] This invention relates to thermoplastic elastomer films. More specifically, the present application relates to thermoplastic elastomer films and methods of extruding such films, wherein the properties of the film are unchanged upon extrusion. Background technique [0005] The present invention relates to thermoplastic elastomer compositions especially for use in reinforced or unreinforced tires and other industrial rubber applications requiring impermeable characteristics. [0006] EP 0 722 850 B1 discloses low permeability thermoplastic elastomer compositions which are excellent as innerliners in pneumatic tires. Such compositions comprise a low-permeability thermoplastic material in which a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60C1/00B32B7/12B32B27/08B32B27/26B32B27/28B32B27/30B32B27/34B32B27/36B29D30/06B29K21/00B29L30/00B29C48/10B29C48/30B29C48/305B29C48/32B29C48/335B29C48/92
CPCB29C48/022B29C48/913B29C48/21B29C48/0018B29C48/912B32B7/12B32B27/08B32B27/26B32B27/281B32B27/286B32B27/302B32B27/34B32B27/36B32B27/365B60C1/0008B29C2948/92209B29C48/30B29C2948/92171B29C2948/92923B29C2948/92619B29C48/335B29C48/307B29C48/32B29C2948/92123B29C48/304B29C2948/92704B29C2948/92628B29C2948/92447B29C48/023B29C2948/92133B29C2948/92428B29D2030/0682B29K2021/003B29L2030/008B29K2995/0067B32B2307/51B32B2307/704B32B2307/702B32B2307/736B32B2605/00B29C55/28B32B25/18B29C55/12B60C5/14B29C48/10B29C48/08B29D30/0681B29K2101/12B29K2105/0005B29K2105/16B32B27/32B32B2264/102
Inventor H·P·纳戴拉
Owner EXXONMOBIL CHEM PAT INC
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