Reactive conductive pressure-sensitive adhesive tape
AssigneeAdhesives Research, Inc.
InventorsDonald Herr, Brian A. Harkins
Life of this patent
Estimating the term…
Abstract
A reactive pressure sensitive adhesive composition is disclosed. A tape formed using the reactive pressure sensitive adhesive is also disclosed. In its cured state, the pressure sensitive adhesive shows superior mechanical and electrical properties compared to conventional, non-curable charge collection tapes. The tape has a cure profile pre-selected to correspond to that of a photovoltaic cell fabrication process, such that curing can take place during cell fabrication and may occur simultaneously with one or more other curing steps employed in cell fabrication.
Claims19
A reactive conductive adhesive tape comprising:
- a reactive adhesive layer comprising:
- a curable pressure sensitive adhesive, and
- a conductive filler;
- and
- an electrically conductive substrate, wherein the adhesive layer is laminated on and in contact with the electrically conductive substrate,
- wherein the adhesive layer is curable from a pre-cure peel strength greater than 2.7 N/cm as measured at a peel angle of 90° at a rate of 12 in./min on a stainless steel substrate to a post-cure peel strength less than the pre-cure peel strength and still greater than 2.7 N/cm as measured at a peel angle of 90° at a rate of 12 in./min on a stainless steel substrate when the adhesive layer is exposed to a temperature in the range of about 150° C. to about 170° C. at a time period in the range of about 10 to about 15 minutes such that the reactive adhesive layer is curable on a photovoltaic cell during a processing step of a fabrication of the photovoltaic cell without a separate curing processing step;
- and
- wherein the adhesive layer has a post cure glass transition temperature less than 0° C.
A reactive conductive adhesive tape comprising
- a reactive adhesive layer comprising:
- a curable pressure sensitive adhesive comprising a reactive acrylic polymer and a blocked isocyanate wherein blocked isocyanate is present as about 12% to about 15% by weight (solids basis) of the reactive acrylic polymer, and
- a conductive filler;
- and
- an electrically conductive substrate, wherein the adhesive layer is laminated on and in contact with the electrically conductive substrate,
- wherein the adhesive layer exhibits a predetermined amount of curing in the range of about 150° C. to about 170° C. at a time period in the range of about 10 to about 15 minutes such that the reactive adhesive layer is curable on a photovoltaic cell during a processing step of a fabrication of the photovoltaic cell without a separate curing processing step;
- and
- wherein the adhesive layer has a post cure glass transition temperature less than 0° C.
Dependencies are inferred from the claim text.