Method for the preparation of a stable anaerobic/UV/visible light curable adhesive
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorRobert Edelman
Life of this patent
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Abstract
An improved process for manufacturing a dual cure anaerobic/ultraviolet adhesive. The process includes the first step of mixing a polymerizable (meth)acrylate ester monomer, such as methacrylic acid, a chelating agent and an accelerator. The second step is heating the mixture sufficiently to provide anaerobic curing properties. Next, one or more photoinitiators are added to the composition. No chelating agent is added during the addition of the photoinitiators.
Claims18
A novel process for preparing a storage stable anaerobic//ultraviolet/visible light dual cure adhesive composition comprising the steps of:
- a) forming a homogeneous mixture comprising one or more polymerizable (meth)acrylate ester monomers, one or more oligomeric polymerizable (meth)acrylate monomers, optionally (meth)acrylic acid, optionally plasticizers or thickening agents or both, one or more chelating agents and at least an effective amount of an accelerator, an organic cyclic sulfimide and heating this mixture at an elevated temperature of 20C to 100C for a time sufficient to achieve acceptable chelation;
- b) Adding a tertiary amine accelerator and continuing to heat the mixture at a temperature in the range of about 20C to about 100C for a time sufficient to provide the composition with the desired anaerobic curing properties and stability on heat aging;
- c) adding one or more photoinitiators and optionally one or more of the group consisting of oxidants, dyes or fluorescent agents at room temperature.
Dependencies are inferred from the claim text.