Abstract: Amine-epoxy curing agents are disclosed including at least one saturated heterocyclic compound having two nitrogen heteroatoms according to formula (I) and at least one saturated fused bicyclic heterocyclic compound having three nitrogen heteroatoms according to formula (II): wherein X is independently selected from a hydrogen atom, a linear or branched C1 to C4 alkyl group and a substituted or un-substituted phenyl group, Y1 is a direct bond or a divalent polyethylene polyamine group having 1 to 8 nitrogen atoms or a divalent polyethylene polyamine derivative having 1 to 8 nitrogen atoms, Y2 is a direct bond or a divalent polyethylene polyamine group having 1 to 7 nitrogen atoms and R is independently a hydrogen atom or a group selected from C1-C8 linear, cyclic, and branched alkyl, alkenyl, and alkaryl groups.

Abstract: A curing agent composition including at least one imidazole salt represented by the structure: where R, R?, is H, or alkyl (1-20 carbon atoms) preferably lower alkyl of 1-7 carbon atoms, haloalkyl (1-20 carbon atoms), aryl, hydroxyl alkyl (1-7 carbon atoms), ester group(s), substituted alkyl and X? is a carboxylate anion of 1-40 carbon atoms; and at least one anhydride curing agent. The disclosed imidazole salts when combined with the anhydride curing agent provide improved latency for epoxy systems while maintaining reactivity at elevated temperature. Epoxy compositions, cured epoxy products and methods for forming cured epoxy products are also disclosed.

Abstract: The invention relates to structural adhesive compositions and more particularly to two-component (2K) structural adhesive compositions. The two components chemically react to bond structural surfaces. N-(3-Aminopropyl)cyclohexylamine (APCHA) has been found to be an improved curing agent for use with epoxy resins in 2K adhesive compositions. APHCA exhibits favorable features including viscosity, pot life and reactivity, and adhesive and thermal performance after curing with epoxy resin. These features and its unique chemistry allow the use of APCHA in curing agent formulations for structural adhesives, in particular wind turbine blade adhesives. APCHA solves issues with viscosity build-up, working time, through-cure, compatibility and adhesive performance that cannot be addressed with the commonly used amine formulations.

Abstract: The disclosure relates to at least one partially reacted product of an isocyanate and an amine (e.g., a reaction product comprising at least one adducted compound). The reaction product comprises polyurea oligomers. The reaction product can be combined with at least one amine in order to formulate a curing agent for epoxy resins wherein the cured epoxy resin has enhanced fracture toughness. The at least partially reacted product does not increase the viscosity of the curing agent and is at least partially soluble in the amine component of the curing agent.

Abstract: The invention relates to structural adhesive compositions and more particularly to two-component (2K) structural adhesive compositions. The two components chemically react to bond structural surfaces. N-(3-Aminopropyl)cyclohexylamine (APCHA) has been found to be an improved curing agent for use with epoxy resins in 2K adhesive compositions. APHCA exhibits favorable features including viscosity, pot life and reactivity, and adhesive and thermal performance after curing with epoxy resin. These features and its unique chemistry allow the use of APCHA in curing agent formulations for structural adhesives, in particular wind turbine blade adhesives. APCHA solves issues with viscosity build-up, working time, through-cure, compatibility and adhesive performance that cannot be addressed with the commonly used amine formulations.

Abstract: The present disclosure provides a liquid curing agent composition comprising at least 50% by weight of a polyamine and 0.2% to 10% by weight of dicyandiamide, the amine/epoxy composition and the product from the cured amine/epoxy composition.

Abstract: Amine-epoxy curing agents are disclosed including at least one saturated heterocyclic compound having two nitrogen heteroatoms according to formula (I) and at least one saturated fused bicyclic heterocyclic compound having three nitrogen heteroatoms according to formula (II): wherein X is independently selected from a hydrogen atom, a linear or branched C1 to C4 alkyl group and a substituted or un-substituted phenyl group, Y1 is a direct bond or a divalent polyethylene polyamine group having 1 to 8 nitrogen atoms or a divalent polyethylene polyamine derivative having 1 to 8 nitrogen atoms, Y2 is a direct bond or a divalent polyethylene polyamine group having 1 to 7 nitrogen atoms and R is independently a hydrogen atom or a group selected from C1-C8 linear, cyclic, and branched alkyl, alkenyl, and alkaryl groups.

Abstract: The disclosure relates to at least one partially reacted product of an isocyanate and an amine (e.g., a reaction product comprising at least one adducted compound). The reaction product comprises polyurea oligomers. The reaction product can be combined with at least one amine in order to formulate a curing agent for epoxy resins wherein the cured epoxy resin has enhanced fracture toughness. The at least partially reacted product does not increase the viscosity of the curing agent and is at least partially soluble in the amine component of the curing agent.

Abstract: Bodily tissue and structures may be protected using a fluid layer containing a mixture of chitosan and oxidized polysaccharide. The mixture forms a protective gel layer via in situ crosslinking. Compared to crosslinking using a low molecular weight aldehyde such as glutaraldehyde or genipin, oxidized polysaccharides appear to provide faster gelation while avoiding the use of potentially less bioacceptable low molecular weight aldehydes.

Abstract: Bodily tissue and structures may be protected using a fluid layer containing a mixture of chitosan and oxidized polysaccharide. The mixture forms a protective gel layer via in situ crosslinking. Compared to crosslinking using a low molecular weight aldehyde such as glutaraldehyde or genipin, oxidized polysaccharides appear to provide faster gelation while avoiding the use of potentially less bioacceptable low molecular weight aldehydes.

Abstract: An epoxy resin composition having a curing component and an epoxy component is disclosed. The curing component includes an amount of about 8% to about 70% by weight of the composition of a primary curing agent and about 0.001% to about 5% by weight of the composition of a secondary curing agent. The present disclosure includes the use of solid secondary curing agents, in particular solvated secondary curing agents, and methods to formulate such a solvated solid to result in a liquid curing component. The epoxy composition also includes about 30% to about 92% by weight of the composition of the epoxy component. A number of equivalents of reactive curative groups in the curing component is from about 0.50 to 0.98 times the number of epoxide equivalents present in the epoxy component. An epoxy product formed from the epoxy resin composition is also disclosed.

Abstract: The present disclosure provides a liquid curing agent composition comprising at least 50% by weight of a polyamine and 0.2% to 10% by weight of dicyandiamide, the amine/epoxy composition and the product from the cured amine/epoxy composition.

Abstract: An epoxy resin composition having a curing component and an epoxy component is disclosed. The curing component includes an amount of about 8% to about 70% by weight of the composition of a primary curing agent and about 0.001% to about 5% by weight of the composition of a secondary curing agent. The present disclosure includes the use of solid secondary curing agents, in particular solvated secondary curing agents, and methods to formulate such a solvated solid to result in a liquid curing component. The epoxy composition also includes about 30% to about 92% by weight of the composition of the epoxy component. A number of equivalents of reactive curative groups in the curing component is from about 0.50 to 0.98 times the number of epoxide equivalents present in the epoxy component. An epoxy product formed from the epoxy resin composition is also disclosed.

Abstract: Bodily tissue and structures may be protected using a fluid layer containing a mixture of chitosan and oxidized polysaccharide. The mixture forms a protective gel layer via in situ crosslinking. Compared to crosslinking using a low molecular weight aldehyde such as glutaraldehyde or genipin, oxidized polysaccharides appear to provide faster gelation while avoiding the use of potentially less bioacceptable low molecular weight aldehydes.

Abstract: Body tissue and structures may be protected using a fluid containing a mixture of partially crosslinked polysaccharide and a further crosslinker. The mixture desirably is sprayable, forms a fluid protective layer via in situ crosslinking, desirably does not drip or run from a treatment site, and may avoid the use of more rapidly curing but potentially less bioacceptable crosslinkers at the treatment site.

Abstract: Chronic rhinosinusitis and other bacterial sinus conditions may be treated by applying a solvating system containing a surfactant to a bacterial biofilm in a nasal or sinus cavity, disrupting the biofilm, and applying a protective layer of a polymeric film-forming medical sealant.

Abstract: Medical devices with polymer coatings designed to control the release of bioactive agents in combination with angiotensin-(1-7) receptor agonists from medical devices are disclosed. Methods for treating or inhibiting post-stent implantation restenosis as well as improving vascular endothelial function in patients are also provided.

Abstract: Body tissue and structures may be protected using a fluid containing a mixture of partially crosslinked polysaccharide and a further crosslinker. The mixture desirably is sprayable, forms a fluid protective layer via in situ crosslinking, desirably does not drip or run from a treatment site, and may avoid the use of more rapidly curing but potentially less bioacceptable crosslinkers at the treatment site.

Abstract: Bodily tissue and structures may be coated with a protective gel layer made from a two-part composition whose first part contains thiolated chitosan and whose second part contains sufficient oxidizing agent or external crosslinking agent so that when the two parts are mixed and coated onto the tissue or structure the mixture will form a protective gel layer in less than 30 minutes.

Abstract: Bodily tissue and structures may be protected using a fluid layer containing a mixture of chitosan and oxidized polysaccharide. The mixture forms a protective gel layer via in situ crosslinking. Compared to crosslinking using a low molecular weight aldehyde such as glutaraldehyde or genipin, oxidized polysaccharides appear to provide faster gelation while avoiding the use of potentially less bioacceptable low molecular weight aldehydes.