Process of making thermal free-radical cure adhesives

US5741542A · kind A · utility

Assignee

• Minnesota Mining and Manufacturing Company · US

Inventors

• Jerry W. Williams · Cottage Grove, US
• Gary T. Boyd · Woodbury, US
• Jeanne M. Goetzke · Woodbury, US
• Gerald L. Uhl · Windom, US
• David A. Ylitalo · Stillwater, US

Key dates

• Filing date: May 18, 1995
• Grant date: Apr 21, 1998
• Expiry date: May 18, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J7/30
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for making an adhesive comprising allowing a carrier web coated with a thermal free-radically polymerizable mixture to remain in a heat exchange medium for a time sufficient to subdue the reaction exotherm and maintain a reaction temperature by thermal contact of the polymerizable mixture with the heat exchange medium and to affect conversion of the coating to an adhesive layer, preferably to a pressure sensitive adhesive layer, wherein the coating is a substantially solvent-free thermally initiated polymerizable mixture comprised of at least one free radical monomer, at least one thermal initiator, optionally, at least one cross-linker and optionally, at least one co-monomer.