The instant invention provides cross-linkable coating compositions, process for producing the same, and substrates coated therewith. The cross-linkable coating composition comprises: (a) polyaldehyde, or acetal or hemiacetal thereof; (b) an acid catalyst having pKa of less than 6; (c) a liquid media; (d) an acrylic polycarbamate comprising at least an average of 2.0 carbamate functional groups, wherein said polycarbamate has a glass transition (Tg) of less than 25 C.; and (e) one or more fillers having a pH in the range of equal to or less than 9 and/or one or more pigments having a pH in the range of equal to or less than 9, and/or one or more additives having a pH in the range of equal to or less than 9, wherein said composition has a curing temperature in the range of less than 70 C.

This application describes methods of forming an object. The methods described include forming a mixture with i) one or more primary diamines, ii) one or more polymerizable monomers, iii) a formaldehyde-type reagent, and iv) a polymerization initiator; forming a gel by heating the mixture to a temperature of at least 50 C.; and curing the one or more polymerizable monomers by activating the polymerization initiator. The one or more primary diamines may include one or more amine functional oligomers and/or primary aromatic diamine small molecules. The one or more polymerizable monomers may include styrenics, acrylates, methacrylates, vinyl esters, unsaturated polyesters, and derivatives thereof. The gel is a polyhemiaminal (PHA), a polyhexahydrotriazine (PHT), and/or a polyoctatriazacane (POTA) polymer, and curing of the gel forms an interpenetrating network of the PHA/PHT/POTA and the polymer formed from the polymerizable monomers.

An aqueous-based coating composition suitable as a package coating comprising: (a) a resinous phase comprising: (i) an at least partially neutralized acid functional polymer containing reactive functional groups, (ii) a curing agent containing functional groups that are reactive with the functional groups of (i), (iii) a polyanhydride having the following structural formula:

##STR00001## where X is a divalent organic group, the resinous phase dispersed in (b) aqueous medium.

An aqueous-based coating composition suitable as a package coating comprising: (a) a resinous phase comprising: (i) an at least partially neutralized acid functional polymer containing reactive functional groups, (ii) a curing agent containing functional groups that are reactive with the functional groups of (i), (iii) a polyanhydride having the following structural formula:

##STR00001## where X is a divalent organic group, the resinous phase dispersed in (b) aqueous medium.