Loctite (r&d) Limited

Harry J Woolfson

Brendan J Kneafsey

Barry N Burns

David P Birkett

Jonathan P Wigham

Ruth A Kelly

Hanns R Misiak

Eadaoin D Ledwidge

Fergal W Tierney

Kieran Mulcahy

Paul Malone

A curable composition for forming anisotropically conductive bonds comprising: (i) an amount of first substantially uncured curable component; (ii) conductive particles coated with a substantially uniformly thick coating of the cure product of a second curable component dispersed within the first curable cyanoacrylate component. The composition is suitable for use as an adhesive composition for bonding chips to electronic circuits. Desirably the first component and the second component are both cyanoacrylates.

Rapidly curing formulations including a conductive component

This invention relates to curable epoxy-based compositions for use in the field of microelectronics, such as those having an epoxy compound which has two or more epoxy groups per molecule, optionally a polythiol compound which has two or more thiol groups per molecule, a latent hardener, and at least one solid organic acid which is substantially insoluble in a mixture of the foregoing components at room temperature. The solid organic acid may be selected from the group consisting of: aliphatic, cycloaliphatic and aromatic carboxylic acids and derivatives thereof, aliphatic, cycloaliphatic, and aromatic quinones and derivatives thereof, phenols and derivatives thereof and enolisable aliphatic, cycloaliphatic and aromatic compounds and derivatives thereof. The solid organic acid should have a pKa of less than or equal to about 12.0, desirably less than or equal to about 10, and often less than or equal to about 9.0, such as less than or equal to about 7.5. The invention also relates to curable epoxy-based compositions including an epoxy compound, a thixotropy-conferring component, a latent hardener and at least one of the solid organic acids above demonstrating improved rheological properties such as yield point maintenance and viscosity maintenance over time.

Epoxy resin composition with solid organic acid

This invention relates to cyanoacrylate-containing compositions that include, in addition to the cyanoacrylate component, certain accelerators to improve fixture speeds on certain substrates.

Cyanoacrylate compositions

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Ranelagh, Ireland

Harry J Woolfson