Film-initiated cure of structural adhesive film

US12187929B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Shantanu R. Ranade · Woodbury, US
• Alexander J. Kugel · Woodbury, US
• Kai U. Claussen · Munich, DE
• Rachna Khurana · Inver Grove Heights, US
• Dean M. Moren · North St. Paul, US
• William H. Sikorski, Jr. · White Bear Lake, US
• Erik M. Townsend · South St. Paul, US

Key dates

• Filing date: Feb 8, 2019
• Grant date: Jan 7, 2025
• Expiry date: Oct 3, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2433/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Curable adhesive free-standing films and adhesive systems comprising such films are provided. In some embodiments, a curable adhesive free-standing film comprises a blend of: a) a first film-forming polymer or oligomer; b) a first species comprising first unsaturated free-radically polymerizable groups, which may be a) or a species other than a); c) a first transition metal cation; d) a reducing agent; and no oxidizing agent. In some embodiments, an adhesive system comprises: I) a first curable adhesive free-standing film as described preceding; and II) a second curable adhesive free-standing film comprising a blend of: e) a second film-forming polymer or oligomer; f) a second species comprising second unsaturated free-radically polymerizable groups, which may be e) or may be a species other than e); and g) an oxidizing agent. In some embodiments, the curable adhesive free-standing films may be pressure sensitive adhesives prior to cure. Methods of use are provided.