The present invention relates to covalent adaptable networks (CANs) having exchangeable crosslinks which are able to undergo repeated covalent bond reshuffling through photo-activation at ambient temperatures. The invention provides covalent adaptable network forming compositions as well as methods of forming, remolding and recycling the CANs of the invention.

A reactive hot-melt adhesive composition that is moisture curable contains: a urethane prepolymer having an isocyanate group, a (meth)acrylic resin, and an adhesion promoter containing at least an isocyanate group-containing (meth)acrylamide compound.

A one-part moisture-curable polyurethane composition of the present technology comprises: a preliminary composition containing a urethane prepolymer (A); and an adhesion promoter (B); the adhesion promoter being a reaction product of a compound (b1) having three or more isocyanate groups; and a compound (b2) of at least one type of a compound selected from the group consisting of compounds represented by Formula (1) to (4) described below and hydrogenated compounds of compounds represented by Formula (1) to (3) described below; wherein a ratio (NCO/OH) between an isocyanate group (NCO) of the compound (b1) and a hydroxy group (OH) of the compound (b2) is 1.2 to 3.2; and a content of the adhesion promoter (B) being 0.1 to 10 parts by mass per 100 parts by mass of the preliminary composition.

A one-part moisture-curable polyurethane composition of the present technology comprises: a preliminary composition containing a urethane prepolymer (A); and an adhesion promoter (B); the adhesion promoter being a reaction product of a compound (b1) having three or more isocyanate groups; and a compound (b2) of at least one type of a compound selected from the group consisting of compounds represented by Formula (1) to (4) described below and hydrogenated compounds of compounds represented by Formula (1) to (3) described below; wherein a ratio (NCO/OH) between an isocyanate group (NCO) of the compound (b1) and a hydroxy group (OH) of the compound (b2) is 1.2 to 3.2; and a content of the adhesion promoter (B) being 0.1 to 10 parts by mass per 100 parts by mass of the preliminary composition.

A polymer that can be used as a release coating or a release agent in an LAB, either of which can be provided in VOC-free form and which exhibits excellent release even after aging under high humidity, includes mer that contain pendent groups that include carbamate functionalities.