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Accelerated Processing of Acrylic Damping Polymers

IP.com Disclosure Number: IPCOM000122344D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 65K

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, and isolation applications in direct storage system devices (DASD). These elastomers are usually synthesized by free radical bulk polymerization processes that require many hours to complete. Additionally, the elastomers must be postcured to optimize their physical and chemical properties.

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Accelerated Processing of Acrylic Damping Polymers

      Acrylic elastomers comprise a very important class of materials
having properties suitable for damping, vibration, and isolation
applications in direct storage system devices (DASD).  These
elastomers are usually synthesized by free radical bulk
polymerization processes that require many hours to complete.
Additionally, the elastomers must be postcured to optimize their
physical and chemical properties.

      Disclosed is a process for preparing acrylic elastomers under
moderate nitrogen pressures, i.e., 50 to 500 psig. Pressure
significantly reduced the time to complete the polymerization and
cure from about 36 hours at atmospheric pressure to about 6-7 hours
under 100 psig nitrogen.

      A 2-liter stainless steel Parr pressure vessel equipped with a
pressure/vacuum gauge, gas inlet and outlet ports, and a pressure
relief valve was used to carry out the polymerization and cure.  The
vessel was heated in a temperature-time programmed furnace.

      Partially polymerized syrups were prepared from 2-ethylhexyl
acrylate and ethyl methacrylate by free radical bulk polymerization.
Benzoyl peroxide and dicumyl peroxide initiators were added to the
two monomers with stirring under nitrogen until a clear solution was
formed.  The mixture was heated in a temperature-controlled water
bath at 60~C for 45 minutes to yield a clear syrup of low viscosity
(ca. 20% conversion to polymer).

      The syrup w...