A dual curable thiol-ene composition comprising a polythiol, an unsaturated compound, a photoinitiator, an organic hydroperoxide (thermal initiator) and optionally a nitrogen-containing base, such as e.g. an N-heterocyclic compound (together with the organic hydroperoxide a redox initiator system). A cross-linked polymer prepared therefrom. A method of making such a polymer. A cured sealant comprising such a polymer. The sealant is preferably for use in aerospace.

Polythioether polymers, sealants containing polythioether polymers, and compounds useful as stabilizing monomers in the manufacture of polythioether polymers are provided. In many embodiments the polymers and sealants demonstrate reduced risk of spoilage that may be caused by low temperature storage of the polymer or uncured sealant. Compounds useful as stabilizing monomers include compounds according to formula I: CH.sub.2CR.sup.1CHR.sup.2SR.sup.3SCHR.sup.4CR.sup.5CH.sub.2 [I] wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 are independently selected from H, CH.sub.3 or C.sub.2H.sub.5, and wherein R.sup.3 is selected from divalent groups comprising 2-12 carbon atoms, 0-5 ether oxygen atoms and 0-5 thioether sulfur atoms, which may be straight, branched or cyclic.

Polythioether polymers, sealants containing polythioether polymers, and compounds useful as stabilizing monomers in the manufacture of polythioether polymers are provided. In many embodiments the polymers and sealants demonstrate reduced risk of spoilage that may be caused by low temperature storage of the polymer or uncured sealant. Compounds useful as stabilizing monomers include compounds according to formula I: CH.sub.2CR.sup.1CHR.sup.2SR.sup.3SCHR.sup.4CR.sup.5CH.sub.2 [I] wherein R.sup.1, R.sup.2, R.sup.4 and R.sup.5 are independently selected from H, CH.sub.3 or C.sub.2H.sub.5, and wherein R.sup.3 is selected from divalent groups comprising 2-12 carbon atoms, 0-5 ether oxygen atoms and 0-5 thioether sulfur atoms, which may be straight, branched or cyclic.

Thiol-terminated polythioether compositions and sealants exhibit an extended working time and rapidly cure at room temperature at the end of the working time are disclosed. The compositions comprise a combination of pyridine catalysts.

Thiol-terminated polythioether compositions and sealants exhibit an extended working time and rapidly cure at room temperature at the end of the working time are disclosed. The compositions comprise a combination of pyridine catalysts.

Sulfur-containing polymeric particles having a high sulfur content can be prepared using emulsion polymerization. The sulfur-containing polymeric particles are useful in aerospace coatings and sealants.

Sulfur-containing polymeric particles having a high sulfur content can be prepared using emulsion polymerization. The sulfur-containing polymeric particles are useful in aerospace coatings and sealants.

Disclosed are methods for making a cured sealant. The methods include depositing an uncured sealant composition on a substrate and exposing the uncured sealant composition to actinic radiation to provide a cured sealant. The uncured sealant composition includes a thiol-terminated polythioether, a polyene comprising a polyvinyl ether and/or a polyallyl compound, and a hydroxy-functional vinyl ether. Related sealant compositions are also disclosed.

Disclosed are methods for making a cured sealant. The methods include depositing an uncured sealant composition on a substrate and exposing the uncured sealant composition to actinic radiation to provide a cured sealant. The uncured sealant composition includes a thiol-terminated polythioether, a polyene comprising a polyvinyl ether and/or a polyallyl compound, and a hydroxy-functional vinyl ether. Related sealant compositions are also disclosed.

The present invention is directed to curable film-forming compositions and coating kits, each comprising: (a) a polyepoxide functional polymer; (b) a polythiol functional compound, wherein the polythiol functional compound comprises at least two or at least three thiol functional groups and wherein if the polythiol functional compound contains hydroxyl functional groups, the ratio of thiol functional groups to hydroxyl functional groups within the polythiol functional compound is not 1:1; (c) a reactive compound different from the polythiol functional compound (b), containing multiple pendant and/or terminal functional groups selected from carboxylic acid, anhydride, amine and phenol that are reactive with epoxide functional groups; and (d) a pigment. The curable film-forming composition demonstrates a pigment to binder ratio greater than or equal to 2 and less than 3, adhesion to diverse substrates, and fast sandability. The present invention is further directed to coated articles and methods of forming them.