http://www.patentstorm.us/patents/5943557-description.html
During shipment of the lead frame from the manufacturer to the user the manufacturer secures fingers and leads of the lead frame to ensure they are not bent during shipping. The fingers and leads are secured with a lead lock tape which is left in place during device processing. The lead lock tape conventionally comprises a polyimide carrier film which is a lower grade material compared to the LOC adhesive tape carrier film, and is less expensive. The lead lock tape is coated on one side with a butyl rubber thermoset adhesive which secures the tape to the lead frame and prevents the leads from moving or bending during shipping.

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