Hardcoats comprising perfluoropolyether polymers with poly(alkylene oxide) repeat units
Assignee3M Innovative Properties Company
InventorsEncai Hao, Zai-Ming Qiu, Yu Yang, Thomas P. Klun
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Abstract
Presently described are articles, such as optical displays and protective films, comprising a (e.g. light transmissive) substrate having a surface layer comprising the reaction product of a mixture comprising a non-fluorinated binder precursor (e.g. of a hardcoat composition) and at least one polymerizable perfluoropolyether polymer. The resulting cured surface layer can advantageously exhibit low lint attraction in combination with low surface energy. Also described are one-step and two-step methods of synthesizing perfluoropolyether polymers having polymerizable ethylenically unsaturated groups.
Claims5
A method of preparing a perfluoropolyether polymer comprising at least one polymerizable ethylenically unsaturated group comprising forming a polymeric intermediate by polymerizing:
- i) one or more perfluoropolyether mono-(meth)acrylate monomers having a Mw of at least 600 g/mole in an amount of 10 to 50 wt.-% of the polymer;
- ii) at least one poly(alkylene oxide) (meth)acrylate monomer;
- iii) a chain transfer agent that lacks a perfluoropolyether group and an alkylene oxide repeat unit;
- iv) optionally at least one ethylenically unsaturated monomer that lacks a perfluoropolyether group and an alkylene oxide repeat unit;
- wherein at least one of ii), iii), or iv), when present, further comprises a reactive group, —RA, that is an isocyanate reactive group;
- and
- reacting the —RA groups of the polymeric intermediate with v) at least one monomer that comprises a —RB group that is an isocyanate group and at least one ethylenically unsaturated group.
Dependencies are inferred from the claim text.