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Material and Process for Manufacturing High Damping Viscoelastic Acrylic Rubbers

IP.com Disclosure Number: IPCOM000111525D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 1 page(s) / 62K

Publishing Venue

IBM

Related People

Allen, RD: AUTHOR [+4]

Abstract

Acrylic elastomers comprise a very important class of materials having properties suitable for damping, vibration control and isolation applications in direct access storage devices (DASD). In order to be effective the materials must damp and isolate over a wide range of temperatures and frequencies which encompass DASD operations. These materials must also meet other requirements such as aging stability an low outgassing of volatile materials.

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Material and Process for Manufacturing High Damping Viscoelastic
Acrylic Rubbers

       Acrylic elastomers comprise a very important class of
materials having properties suitable for damping, vibration control
and isolation applications in direct access storage devices (DASD).
In order to be effective the materials must damp and isolate over a
wide range of temperatures and frequencies which encompass DASD
operations.  These materials must also meet other requirements such
as aging stability an low outgassing of volatile materials.

      Disclosed is a new class of elastomers capable of damping over
a broad temperature/frequency range.  A process for making these
polymers is described.  The materials are acrylic elastomers
synthesized from partially polymerized syrups consisting of
2-ethylhexylacrylate (EHA), ethyl methacrylate (EMA) or n-butyl
methacrylate (n-BMA), and acrylic acid (AA).  Acrylic acid is an
essential and key monomer in these formulations.  Without AA, the
effective temperature/frequency damping range is too narrow to be of
general use as a damping material.  With AA, the damping range is
significantly broadened and the material is rendered suitable for
damping applications.  In addition, AA significantly improves
adhesion of these materials to metal surfaces.

      For optimum processing and properties, the EMA content of the
syrup is kept at or above 10% by weight and the AA content is
maintained between 5-10% by weight.  In a typical synthesis a syrup
is prepared from 16.0 g (...