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AT&T USES FOOD FLAVORING TO REDUCE OZONE-DEPLETING EMISSIONS

 NORTH ANDOVER, Mass., Nov. 30 ~PRNewswire~ -- AT&T (NYSE: T) today announced it has developed a new manufacturing technique which will increase plant efficiency and help eliminate emissions of an ozone- depleting chlorohydrocarbon (CHC).
 The technique employs a solvent which can be found in foods such as cantaloupe. It is used in the fabrication of multi-chip modules -- densely packaged integrated circuits used in applications such as high-speed computers and transmission and switching systems in telecommunications networks.
 Working with AT&T Bell Laboratories Engineering Research Center, a team of scientists and engineers at AT&T Microelectronics here developed a procedure for using the solvent, named n-butyl butyrate, in place of 1,1,1-trichloroethane -- an ozone-depleting chemical traditionally used in electronics manufacturing. The new chemical is non-toxic, and can be distilled and reused in the manufacturing process.
 The specific process using the new solvent is one in which microcircuits, coated with a patented AT&T material, are photographically imaged using a finely-detailed photo mask. A pattern is then generated by spraying n-butyl butyrate onto the circuits to dissolve the unexposed parts of the coating. The result is a sharply defined pattern.
 Use of this solvent was tested at Bell Laboratories and at Merrimack Valley Works during the past two years. The procedure will be used in all of the company's POLYHIC (Multiple Hybrid Integrated Circuit) multi- chip module manufacturing by the end of 1992.
 AT&T's development of this new process is the latest in a series of initiatives by AT&T Bell Laboratories to protect the ozone layer. AT&T has made an R&D investment of $25 million to develop or co-develop replacement and alternative technologies for ozone-depleting solvents. Thus far, these include water-soluble flux, the Low-Solids Spray Fluxer (flux is a cleaning and wetting agent sprayed on printed circuit boards to make the solder adhere better), and BIOACT EC-7, a cleaning solvent derived from orange peels.
 These technologies are being used in manufacturing operations around the globe, saving millions of dollars, as well as protecting the Earth's fragile ozone layer. To date, AT&T has reduced its chlorofluorocarbon (CFC) emissions 76 percent.
 AT&T received the 1992 EPA Stratospheric Ozone Protection Award for its efforts.
 -0- 11~30~92
 ~CONTACT: Rich Larris, 908-204-8264, or home, 908-446-1380, or S. Kay Gibbs, 617-574-3163, or home, 617-266-3059, both of AT&T~
 (T)


CO: AT&T ST: New Jersey, Massachusetts IN: CHM TLS SU: PDT

GK-OS -- NY029 -- 1874 11~30~92 11:13 EST
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Publication:PR Newswire
Date:Nov 30, 1992
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