A medical tissue adhesive and a preparation method thereof. The medical tissue adhesive includes: a functional component, an assistant crosslinker and a dispersing agent. The functional component is a polymer chain modified by tissue adhesive group or a micro nano particle modified by tissue-adhering functional groups. The tissue-adhering functional groups includes: o-nitrobenzyl photoplate group, active ester group or carbonyl group. The medical tissue adhesive not only uses the dispersing agent to expel the tissue fluid/blood on the tissue surface, so that the adhesive molecular segment quickly forms a chemical bond with the amino group on the tissue surface to form a strong tissue adhesive force. But the medical tissue adhesive can also trigger the adhesive molecular segment to react with the amino group on the assistant crosslinker, so that the medical tissue adhesive can quickly gel and solidify. Therefore, it has good bleeding performance, hemostatic performance and tissue adhesion performance.

A medical tissue adhesive and a preparation method thereof. The medical tissue adhesive includes: a functional component, an assistant crosslinker and a dispersing agent. The functional component is a polymer chain modified by tissue adhesive group or a micro nano particle modified by tissue-adhering functional groups. The tissue-adhering functional groups includes: o-nitrobenzyl photoplate group, active ester group or carbonyl group. The medical tissue adhesive not only uses the dispersing agent to expel the tissue fluid/blood on the tissue surface, so that the adhesive molecular segment quickly forms a chemical bond with the amino group on the tissue surface to form a strong tissue adhesive force. But the medical tissue adhesive can also trigger the adhesive molecular segment to react with the amino group on the assistant crosslinker, so that the medical tissue adhesive can quickly gel and solidify. Therefore, it has good bleeding performance, hemostatic performance and tissue adhesion performance.

Formaldehyde-free aqueous binder compositions, their preparation, and their use to prepare engineered composite products, where the aqueous binder has at least some solids content, the aqueous binder including a carbohydrate polymer in an amount of about 5% to about 90% of the solids content, by weight; a copolymer of an alkenyl aromatic with at least one of an acrylate or diene in an amount of about 1% to about 40% of the solids content, by weight; and urea in an amount of about 2% to about 90% of the solids content, by weight.

Formaldehyde-free aqueous binder compositions, their preparation, and their use to prepare engineered composite products, where the aqueous binder has at least some solids content, the aqueous binder including a carbohydrate polymer in an amount of about 5% to about 90% of the solids content, by weight; a copolymer of an alkenyl aromatic with at least one of an acrylate or diene in an amount of about 1% to about 40% of the solids content, by weight; and urea in an amount of about 2% to about 90% of the solids content, by weight.

A novel diazirine-based biocompatible polymer that can be used as on-demand or tunable bioadhesive and applied across various clinically important surfaces. The biocompatible polymer comprises a single strand of repeating units and up to 5,000 photoreactive diazirine groups covalently attached to it. A bioadhesive composition comprises the polymer of the present invention and suitable solvents, surfactants, stabilizers, fillers and other additives. The composition may additionally contain metallic particles of size less than 50 micron made of rare earth elements and has UV or NIR transparency less than 1 optical density unit per 1 centimeter. The poly-diazirine surface grafted thin films can be used for minimally invasive surgeries.

A novel diazirine-based biocompatible polymer that can be used as on-demand or tunable bioadhesive and applied across various clinically important surfaces. The biocompatible polymer comprises a single strand of repeating units and up to 5,000 photoreactive diazirine groups covalently attached to it. A bioadhesive composition comprises the polymer of the present invention and suitable solvents, surfactants, stabilizers, fillers and other additives. The composition may additionally contain metallic particles of size less than 50 micron made of rare earth elements and has UV or NIR transparency less than 1 optical density unit per 1 centimeter. The poly-diazirine surface grafted thin films can be used for minimally invasive surgeries.

A moisture control mechanism that allows a desired amount of moisture to evaporate out of a multiple ply paperboard structure is provided. The moisture control mechanism comprises an adhesive that adheres the multiple plies together, the adhesive comprising dextrin and an acrylic polymer. Alternately or additionally, a strength preservation mechanism that allows a strength to be maintained even when a multiple ply paperboard structure is highly wet. The strength preservation mechanism comprises an adhesive that adheres multiple plies together, the adhesive comprising dextrin and an acrylic polymer.

A moisture control mechanism that allows a desired amount of moisture to evaporate out of a multiple ply paperboard structure is provided. The moisture control mechanism comprises an adhesive that adheres the multiple plies together, the adhesive comprising dextrin and an acrylic polymer. Alternately or additionally, a strength preservation mechanism that allows a strength to be maintained even when a multiple ply paperboard structure is highly wet. The strength preservation mechanism comprises an adhesive that adheres multiple plies together, the adhesive comprising dextrin and an acrylic polymer.