Form in-place gasket with tack free surface

摘要

A method of preparing a flexible, substantially tack free gasket by forming a liquid composition which is a radiation polymerizable admixture of a free radical polymerizable urethane(meth)acrylate monomer, free radical polymerizable urethane(meth)acrylate oligomer, or combinations thereof; a free radical polymerizable diluent; a free radical polymerization photoinitiator; a wax; a thixotropic agent; and optionally an adhesion promoter and a colorant. The composition is distributed onto a substrate and then exposed to actinic radiation to cure the liquid composition into a flexible, substantially tack free gasket having a Shore A hardness of from about A20 to about A80.

主权项

1. A method of preparing a flexible, substantially tack free gasket which comprises:
I) forming a liquid composition which comprises a radiation polymerizable admixture of a) a component consisting essentially of from about 20 wt % to about 85 wt. % of at least one or more of a free radical polymerizable urethane acrylate monomer and a free radical polymerizable urethane methacrylate monomer, in combination with at least one or more of a free radical polymerizable tetramethylene glycol urethane acrylate oligomer and a free radical polymerizable propylene glycol urethane methacrylate oligomer; b) from about 5 wt % to about 70 wt. % of a free radical polymerizable diluent; c) from about 1 wt % to about 6 wt. % of a free radical polymerization photoinitiator; d) from about 4 wt % to about 30 wt. % of a wax; e) from about 2 wt % to about 10 wt. % of a thixotropic agent; f) about 0 wt % to about 10 wt. % of an adhesion promoter; and g) about 0 wt % to about 1 wt. % of a colorant; II) distributing the liquid composition onto a substrate; and then III) exposing the liquid composition to actinic radiation such that components (a) and (b) thereby form a polymerization product consisting essentially of polymerized components (a) and (b), and to form a cured liquid composition into a flexible, substantially tack free gasket having a Shore A hardness of from about A20 to about A80.