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Polymer blend and compositions and methods for using the same

a technology of polymer blend and composition, applied in the field of polymer blend, can solve the problems of long-term compatibility problems and the use of sealant formulations

Inactive Publication Date: 2005-11-03
PRC DE SOTO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use of sealant formulations having different chemistries together, however, can often have long-term compatibility problems.

Method used

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Examples

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example

[0033] The following example is intended to illustrate the invention, and should not be construed as limiting the invention in any way.

[0034] A Class A sealant was prepared by mixing the components listed in Table 1 in a double shaft cowls type batch mixer until homogeneous under a vacuum of 27 inches of mercury or greater. Component B represents the polymer blend of the present invention and Component A represents an accelerator. Components B and A were mixed in a weight ratio of 100:12 to prepare the final sealant. The sealant was tested to the requirements of BMS 5-45 Rev. B Class A Grade 1. For example, long-term compatibility of the sealant was tested. The sealant comprising the blend was applied over a cured polysulfide aerospace sealant that had been previously exposed to jet reference fluid; the sealant comprising the blend was allowed to cure to a tack-free condition and then a polythioether sealant was applied over the sealant comprising the blend, allowed to cure for 14 ...

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Abstract

A polymer blend having at least one polysulfide component and at least one polythioether component is disclosed. The polymer blend offers numerous advantages, including the ability to compatibilize formulations based on either polysulfide chemistry or polythioether chemistry alone. Compositions comprising the polymer blend, particularly sealant formulations for use in aerospace applications, are also disclosed, as are multilayer sealant assemblies and methods for repairing the same.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation-in-part of Ser. No. 10 / 837,337, filed Apr. 30, 2004.FIELD OF THE INVENTION [0002] The present invention relates to a polymer blend comprising at least one polysulfide component and at least one polythioether component. BACKGROUND INFORMATION [0003] Sulfur-containing polymers are known to be well suited for use in aerospace sealants due to their fuel resistant nature upon crosslinking. Polysulfide sealants offer high tensile strength, high tear strength, thermal resistance and resistance to high ultraviolet light. Such sealants also offer resistance to fuel and maintain their adhesion upon exposure to fuel. [0004] Various sulfur-containing polymers, including for example thiol-terminated sulfur-containing polymers and polysulfide polymers, are used in commercially available sealant formulations. It is often desirable to use different sealant formulations in combination to achieve the desired properties ...

Claims

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Application Information

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IPC IPC(8): C08G75/00
CPCC08L81/02C08L81/04Y10T428/2848C08L81/00Y10T428/31533C08L81/06
Inventor COSMAN, MICHAEL A.
Owner PRC DE SOTO INT INC
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