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Peroxide cured fluorocarbon elastomer compositions

a technology of fluorocarbon elastomers and compositions, which is applied in the field of dynamic vulcanization of fluorocarbon elastomers in thermoplastics, can solve the problems of peroxide splashing or bumping upon addition, affecting the physical properties such as tensile strength, and volatilizing various components of the composition, so as to improve the physical properties of shaped objects, improve the effect of temperature stability and low volatilization and degradation

Inactive Publication Date: 2007-06-21
FREUDENBERG NOK GEN PARTNERSHIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a method of making a thermoplastic vulcanizate (TPV) by adding a high temperature peroxide to a molten blend of fluorocarbon elastomer and thermoplastic material. This process results in improved physical properties of shaped articles made from the TPV. Another embodiment involves adding a peroxide masterbatch to a molten blend of a fluorocarbon elastomer and thermoplastic material. This results in a curing composition that can be used to cure the fluorocarbon elastomer in the blend. The resulting molded articles have elastomeric properties suitable for use in seals and gaskets, and are generally more advantageous than other methods.

Problems solved by technology

The heat generated can lead to volatilization of various components of the composition during the post cure phase.
Physical properties such as tensile strength may be adversely affected.
Because it is added to a hot molten mixture of an elastomer and thermoplastic, the peroxide may splash or bump upon addition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

on of Peroxide Masterbatches

[0083] The procedure to make masterbatches containing curable fluorocarbon elastomer is as follows: 1) Melt the fluorocarbon elastomer, (for example Tecnoflon P757, a peroxide curable fluorocarbon elastomer containing a cure site, commercially available from Solvay) in a batch mixer such as a Brabender with an internal mixer attachment at a temperature of from 80-100° C. 2) Add a curative package consisting of Luperco 101 XL and TAIC. Luperco 101 XL contains as an active ingredient 2,5,-dimethyl-2,5-di(tert-butylperoxy)hexane. TAIC is triallylisocyanurate. Continue mixing until a homogeneous mixture is obtained. 3) Discharge the mixture from the internal mixer, cool and pulverize into a powder or small pellets. The compositions may then be used as masterbatch material during dynamic compounding of fluorocarbon elastomers with thermoplastic material.

[0084] Masterbatches are made at three different concentrations of peroxide and TAIC, given in Examples 1a,...

examples 2-4

nd Batch Processes

[0085] Examples 2-4 illustrate recipes for making moldable compositions of the invention. They can be made by either batch or continuous processes.

[0086] In a batch process, the peroxide curable elastomer (Tecnoflon P757) and the thermoplastic (here a fluoroplastic, Kynar Flex 2500-04) are mixed and melted in a Brabender or Banbury type batch mixer at 150° C. for 5 minutes. The zinc oxide is then stirred in. A chopped masterbatch material (1-3 mm size, Example 1) is added to the mixer and stirred for an additional 3-5 minutes at 150° C. to form a fully cured thermoplastic vulcanizate. Alternatively, the mixing may be carried out for a shorter time such as 30 seconds to prepare a partially cured vulcanizate. The composition is then discharged from the batch mixer and granulated to make small size pellets for use in subsequent fabrication processes, such as injection molding, compression molding, blow molding, single layer extrusion, multi-layer extrusion, insert mo...

example 2

[0088]

Ex 2aEx 2bEx 2cEx 2dEx 2eIngredientsphrphrphrphrphrTecnoflon80.080.080.080.080.0P757Kynar Flex25.050.0100.0150.0200.02500-04ZnO5.005.005.005.005.00MT N-99010.0010.0010.0010.0010.00carbon blackMasterbatch -20.0020.0020.0020.0020.00Ex 1a

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PUM

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Abstract

A process involves adding a peroxide masterbatch to a molten blend of a fluorocarbon elastomer and a thermoplastic material. The peroxide masterbatch contains greater than or equal to 5% weight percent organic peroxide, further contains a fluorocarbon elastomer, and typically also contains a crosslinker containing at least two sites of olefinic unsaturation. The fluorocarbon elastomer in the molten blend and in the peroxide masterbatch may be the same or different. After the peroxide masterbatch is added to the molten blend, the combination is mixed at a temperature and for a time sufficient to effect cure of the fluorocarbon elastomers. By using a masterbatch, a faster and more uniform dispersion of peroxide curative is possible due to pre-dispersion of peroxide in the elastomer phase, which leads to shaped articles having improved mechanical properties.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. patent application Ser. No. 10 / 771,693 filed on Feb. 4, 2004, the disclosure of which is incorporated herein by reference.INTRODUCTION [0002] The present invention relates to dynamic vulcanization of fluorocarbon elastomers in thermoplastics. More particularly, it relates to the use of organic peroxides as curing agents for the elastomers. [0003] Cured elastomers or rubbers have a variety of physical properties useful for applications in molded articles. Among the properties are a high degree of flexibility, elasticity, and resistance to compression set. As such they find use in a variety of applications, such as seals and gaskets. Uncured elastomers or rubbers are in the form of a resin or gum. To obtain a molded article with suitable elastomeric properties, the uncured resins are crosslinked or cured with a variety of crosslinking agents. [0004] For conventional elastomers, cure is generally ca...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F8/00C08J3/22C08J3/24C08K5/14C08L27/12C08L27/16
CPCC08J3/226C08J2327/12C08J2427/00C08K5/14C08L27/12C08L27/16C08L2205/02C08L2666/04A63C3/12
Inventor PARK, EDWARD HOSUNGWALKER, FRANCIS JOSEPH
Owner FREUDENBERG NOK GEN PARTNERSHIP
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