ACRYLIC ADHESIVE COMPOSITION WITH CONTROLLED MOLECULAR WEIGHT

摘要

A method for preparing an acrylate adhesive is provided by the steps of partially polymerizing a monomer mixture to provide a syrup polymer composition having a high molecular weight solute copolymer. This first syrup composition is again polymerized to provide a second syrup polymer composition having a low molecular weight copolymer. The second syrup polymer composition is provided with a crosslinking agent and further polymerized to provide the adhesive composition.

主权项

1. A method of preparing an acrylic adhesive copolymer comprising the steps of:
a) partially polymerizing a (meth)acrylate monomer mixture to a conversion of 0.1 to 25% to produce a first syrup copolymer comprising a high Mw solute copolymer having a Mw of 300,000 to 3,000,000, and unreacted solvent monomer, b) add a chain transfer agent and an initiator to the first syrup and partially polymerizing to produce a second syrup polymer comprising the high Mw solute copolymer, a low Mw solute copolymer having a Mw of 300-300,000, and unreacted solvent monomer; c) quench the chain transfer agent, and add a crosslinking agent, a photoinitiator and an optional tackifier and photopolymerizing the mixture to produce an adhesive copolymer.