Epoxy group-containing (meth)acrylic polymers and curable compositions containing the same

A liquid epoxy group-containing (meth)acrylic polymer with specific properties addresses handling issues and enhances mechanical properties and adhesion in curable compositions, suitable for electronic components and adhesive applications.

JP7892959B2Inactive Publication Date: 2026-07-22TOAGOSEI CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOAGOSEI CO LTD
Filing Date
2021-05-18
Publication Date
2026-07-22
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing epoxy group-containing (meth)acrylic polymers, particularly those with high molecular weights, exhibit high viscosity and are difficult to handle, and their cured products lack sufficient mechanical properties and adhesion when used alone or in compositions.

Method used

Development of a liquid epoxy group-containing (meth)acrylic polymer with a weight average molecular weight of 3,100 or more, an epoxy value of 0.1 meq/g or more, and a viscosity of 80,000 mPa·s or less, containing specific structural units derived from alkyl (meth)acrylate and glycidyl (meth)acrylate, which can be used in curable compositions with other resins to enhance mechanical properties and adhesion.

Benefits of technology

The polymer achieves low viscosity for easy handling, forms cured products with excellent mechanical properties and adhesion, and enables efficient production of curable compositions suitable for electronic components and adhesive applications.

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Abstract

To provide an epoxy group-containing (meth)acrylic polymer capable of forming a cured product that is liquid with low viscosity at room temperature, offering easy handleability, and also has high mechanical strength when cured, and a curable composition that contains the epoxy group-containing (meth)acrylic polymer and can sufficiently bond together members, for example, in the manufacture of electronic parts.SOLUTION: An epoxy group-containing (meth)acrylic polymer has a weight average molecular weight of 3,100 or more, an epoxy value of 0.1 meq / g or more, and a viscosity of 80,000 mPa s or less at 25°C. An average number of epoxy groups per molecule is preferably 2.3 or more. Each molecule preferably includes carbon-carbon double bonds at a rate of 0.20-0.65 meq / g.SELECTED DRAWING: None
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