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US 2016/0108248 A1Published application
Acetoacetyl Thermosetting Resin for Gel Coat
AssigneePolynt Composites USA, Inc.
InventorsMing Yang Zhao, Chih-Pin Hsu, Steven L. Voeks, Richard Landtiser
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Abstract
Zero VOC thermosetting gel coat and laminating resin compositions, and composites and articles, are produced using a multifunctional Michael acceptor, a multifunctional Michael donor and a base catalyst. The obtained low viscosity resin is useful for producing zero VOC gel coats and laminates having excellent curability at ambient temperatures.
Claims21
A method of making a styrene free gel coat composition, comprising:
- reacting a polyhydroxy polyol having at least two hydroxyl groups per molecule with a C1-C5 alkyl acetoacetate in a transesterification process to form a crosslinkable, multifunctional acetoacetylated polyhydroxy polyol having at least two acetoacetyl functional groups per oligomer;
- and
- combining the acetoacetylated polyhydroxy polyol with one or more multifunctional acrylate monomers or oligomers, a thixotropic agent, and a base catalyst, to form a crosslinkable, styrene free, thermosetting gel coat composition having a viscosity at ambient temperature of about 50 to 1200 cps under high shear and of about 8,000 to about 25,000 cps at low shear.
A method of making a gel coated article, comprising:
- reacting a polyhydroxy polyol having at least two hydroxyl groups per molecule with a C1-C5 alkyl acetoacetate in a transesterification process to form a crosslinkable, multifunctional acetoacetylated polyhydroxy polyol having at least two acetoacetyl functional groups per oligomer;
- combining the acetoacetylated polyhydroxy polyol with one or more multifunctional acrylate monomers or oligomers, at least one additive component, and a base catalyst, to form a crosslinkable thermosetting gel coat composition having a viscosity at ambient temperature of about 50 to 1200 cps under high shear and of about 8,000 to about 25,000 cps at low shear;
- and
- applying the thermosetting gel coat composition as an in-mold coating to a surface of a mold;
- allowing the gel coat composition to cure at ambient temperature to form a partially crosslinked, tacky to tacky-free gel coat;
- applying a material to be molded onto the partially crosslinked gel coat;
- applying a crosslinkable laminating resin onto said material, the laminating resin comprising an acetoacetylated polyhydroxy polyol having at least two acetoacetyl functional groups per molecule, one or more multifunctional acrylate monomers or oligomers and a base catalyst;
- and
- allowing the laminating resin and the gel coat to cure at ambient temperature to a solid, crosslinked, thermoset resin being styrene free.
6 more elements
20-30. (canceled)
Dependencies are inferred from the claim text.