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Self-Reactive copolymer resins are acrylic copolymers which contain photocurable functionality on their backbone.

Reactive Acrylic Copolymers can eliminate extractables (low migration) and odor related to traditional photoinitiators. They allow for simplified processing by eliminating the need to dissolve traditional photoinitiators into resin. They can also be used as their own curable films or be formulated to function as polymeric photoinitiators. 

 

Performance attributes
  • Requires no added photoinitiator
  • Copolymers can provide a solution to applications where low shrinkage and adhesion are desirable
  • Acrylic backbone has good compatibility with acrylate monomers/oligomers
  • Customizable performance based on monomer choice
  • High molecular weight of copolymer further contributes to low migration

Traditional copolymers used in UV/LED coatings

Non-reactive Polymer (IPN after UV Cure)
Non-reactive polymer - SRR.png
  • Acrylic polymer, Mn~10-20K
  • Film former
  • Specific adhesion, variable polarity
  • Reduces volume shrinkage upon cure

 

Acrylated Acrylic Polymer (Single Network After Cure)
Non-reactive polymer - SRR.png
  • Acrylic polymer, Mn~10-20K
  • Film former
  • Specific adhesion, variable polarity
  • Reduces volume shrinkage upon cure
  • Reacts with other acrylic monomers/oligomers

 

New reactive copolymers performance

Adhesion

There is a minor decrease in adhesion as Tg increases, this trend is more pronounced in the aluminum samples. The co-monomer choice seems to play a bigger role than the target Tg.

*LTM = Low Tg monomer; HTM = High Tg monomer; RACP = Reactive Acrylic Copolymer /  *The control sample is denoted as a red line on graphs

Cross Hatch Adhesion to Aluminum.png

Stain resistance

Mustard Stain Resistance.png

Observations and next steps from initial testing matrix

  • Tg of RACP does not impact adhesion and stain resistance drastically
  • Choice of co-monomer does impact overall performance
  • Different RACPs may be suitable for different applications depending on performance requirements

Conclusions and future work

Our new reactive acrylic copolymers are designed to provide the bulk of a coating’s properties since they will be used as a major component in the formulation. We found that different co-monomers can be used to target a specific property. DB conversion via FTIR shows high levels of conversion across all samples, showing that grafting the chromophore onto the copolymer backbone does not inhibit reactivity. These reactive resins can easily be made without chromophore for non-UV/LED applications.

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