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US 5,212,210 AGranted
Energy curable compositions having improved cure speeds
AssigneeMinnesota Mining and Manufacturing Company
InventorLeo W. Halm
Life of this patent
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Abstract
A composition and method provide improved physical properties and cure speed of polyurethane precursors, with or without free radical polymerizable monomers or oligomers present, by use of a two component catalyst system. The resin blend can be activated with a latent organometallic catalyst combined with an organic peroxide which can be a hydroperoxide or an acyl peroxide to decrease the cure time while increasing the break energy and tangent modulus of the system.
Claims26
A polymerizable composition comprising a polymeric precursor as disclosed in (1) or (2) wherein
- (1) comprises at least one polyisocyanate, and at least one compound bearing at least two isocyanate-reactive hydrogen atoms, the isocyanate and reactive hydrogen-containing compound constituting polyurethane precursors, or
- (2) comprises at least one ethylenically-unsaturated monomer, at least one polyisocyanate, and at least one compound bearing at least two isocyanate-reactive hydrogen atoms, the isocyanate and reactive hydrogen-containing compound constituting polyurethane precursors,
- and a two-component curing agent for (1) or (2) comprising an ionic salt of an organometallic complex cation comprising at least one transition metal atom and at least one carbon to metal atom bond, and a peroxide selected from the group consisting of hydroperoxides and acyl peroxides, wherein said polymerizable composition, when subjected to sufficient energy to effect polymerization, provides a tack-free cured composition.
A method comprising the steps of:
- (a) providing a mixture comprising a polymeric precursor composition selected from the group consisting of
- (1) at least one polyisocyanate, and at least one compound bearing at least two isocyanate-reactive hydrogen atoms, the isocyanate and reactive hydrogen-containing compound constituting polyurethane precursors, and
- (2) at least one ethylenically-unsaturated compound, at least one polyisocyanate, and at least one compound bearing at least two isocyanate-reactive hydrogen atoms, the isocyanate and reactive hydrogen-containing compound constituting polyurethane precursors, and
- a catalytically effective amount of a two-component curing agent for (1) or (2) comprising
- (1) an organometallic salt comprising at least one transition metal atom and at least one carbon to metal atom bond, and
- (2) a peroxide selected from the group consisting of hydroperoxides and acyl peroxides;
- (b) allowing said mixture to polymerize or adding energy to said mixture to effect polymerization to provide a tack-free cured composition.
4 more elements
Dependencies are inferred from the claim text.