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Method for rigid backbone polymers for a UHT tray

IP.com Disclosure Number: IPCOM000033861D
Publication Date: 2004-Dec-30
Document File: 3 page(s) / 70K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for rigid backbone polymers for a ultra-high temperature (UHT) tray. Benefits include improved functionality, improved performance, and improved reliability.

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Method for rigid backbone polymers for a UHT tray

Disclosed is a method for rigid backbone polymers for a ultra-high temperature (UHT) tray. Benefits include improved functionality, improved performance, and improved reliability.

Background

              Warpage/coplanarity of the UHT tray occurs at high temperatures during the assembly process (see Figure 1).

              The stiffness of the UHT trays helps to protect the devices on the trays in shipment.

      Conventionally, the problem is solved by using metal trays that can withstand high-temperature reflow (HTR). Additionally, warped UHT trays are constantly replaced.

              Using materials with a high glass transition temperature (Tg) can prevent polymers from deforming at a high temperature. UHT trays used in assembly are subjected to high temperatures, especially during a lead-free HTR process

              The thermal stability and mechanical strengths of a polymer tray is important in reducing semiconductor package failure. During the production of the UHT tray, using the correct compound in the tray formulation enhances the reliability and quality of the tray.

              Poly(phenylene sulfone), poly ether ketone, and poly ether ether ketone are examples of polymer with a stiff and non-flexible backbone. These polymers contain inflexible backbones and phenyl rings that restrict the molecular motion of their polymer chains (see Figure 2).

Description

      The disclosed method uses a rigid backbone polymer in the formulation of UHT trays to increase their Tg. Poly(phenylene sulfone) is thermally and chemically stable due to its rigid backbone structures. The highly stiff and rigid backbon...