Visible light polymerizable thiol-ene composition
AssigneeMinnesota Mining and Manufacturing Company
InventorBrian W. Ostlie
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Abstract
Visible light cured polymerizable thiol-ene compositions comprising at least one monomer or oligomer having a plurality of free-radically polymerizable ethylenically unsaturated groups, at least one compound having a plurality of thiol groups, at least one acyl phosphine oxide photoinitiator and optional adjuvants, such as stabilizers, pigments, fillers, and polymerization inhibitors are disclosed. The polymerized compositions are useful, as protective coatings, or anti-chip coatings or as repair putties on exterior coated substrates such as plastics, wood and metal, especially for the automotive and marine industries.
Claims17
A polymerizable composition comprising:
- (a) a mixture of a vinyl monomer or oligomer and a (meth)acrylic monomer or oligomer;
- (b) at least one compound having a plurality of thiol groups;
- and
- (c) an acyl phosphine oxide photoinitiator blended with an .alpha.-hydroxyketone, with absorption in the visible range sufficient to initiate photopolymerization.
A method of coating a substrate with a protective coating comprising:
- (a) providing a substrate having a surface that can be coated;
- (b) applying a visible light polymerizable composition to said surface wherein said composition comprises:
- (i) a mixture of a vinyl monomer or oligomer and a (meth)acrylic monomer or oligomer;
- (ii) at least one compound having a plurality of thiol groups;
- (iii) an acyl phosphine oxide photoinitiator blended with an .alpha.-hydroxyketone;
- and
- (c) irradiating the coated substrate with visible light until said coating is cured.
A method of repairing a defect in a coated substrate comprising;
- (a) providing a coated substrate having one or more defects,
- (b) applying a visible light polymerizable composition to said adherent region, wherein said composition comprises:
- (i) a mixture of a vinyl monomer or oligomer and a (meth)acrylic monomer or oligomer,
- (ii) at least one compound having a plurality of thiol groups,
- (iii) an acyl phosphine oxide photoinitiator blended with an .alpha.-hydroxyketone, and
- (iv) at least one filler;
- and
- (c) irradiating the coated region with visible light until said composition is cured.
Dependencies are inferred from the claim text.