Patent ID: 11859113
Assignee: FONDAZIONE ISTITUTO ITALIANO DI TECNOLOGIA
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  H  Y | IPC C  H

Claim 10:
11. A process for preparing an electrically conductive adhesive composition, free of metals and metal salts, comprising:
an adhesive polymer component selected from the group consisting of polyethylene-vinyl acetate, polyolefin elastomers, polyvinyl butyral, poly(acrylic acid), polyacrylates and poly(methyl methacrylate) in quantities ranging from 5% to 40% by weight,
an electrically conductive component comprising acetylene or carbon black nanoparticles, carbon nanotubes and flakes or plates of graphene or graphene derivatives in quantities ranging from 60% to 95% by weight, percentages by weight being referred to 100 parts by weight of the adhesive polymer component and electrically conductive component,
wherein said electrically conductive component consists of:
acetylene or carbon black nanoparticles from 15% to 45% by weight,
carbon nanotubes from 5% to 25% by weight, and
flakes or plates of graphene or graphene derivatives from 35% to 70% by weight,
the percentages by weight being referred to 100 parts by weight of said electrically conductive component, and
a solvent compatible with the adhesive polymer component in quantities ranging from 50% to 90% by weight referred to 100 parts of the electrically conductive adhesive composition consisting of the adhesive polymer component, electrically conductive component and solvent,
the process comprising:
melting said adhesive polymer component and dissolving or dispersing the adhesive polymer component in the solvent compatible with the adhesive polymer component, and
mixing the electrically conductive component with the adhesive polymer component in said solvent at a temperature between 40° C. and 60° C. to obtain a paste.