A thin self-supporting adhesive film is claimed that includes a first polyurethane and a solid surface-deactivated isocyanate.

A blocked isocyanate has an isocyanate group of a polyisocyanate compound blocked with one or more blocking agents including a first blocking agent, which is represented by general formula (1). At least some of the first blocking agent has been neutralized with acid.

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(wherein R.sup.1 to R.sup.5 each represent a hydrogen atom or a hydrocarbon group having 1 to 12 carbon atoms; R.sup.1 and R.sup.3 may be bonded to each other to form a heterocycle, R.sup.4 and R.sup.1 may be bonded to each other to form a heterocycle, and R.sup.5 and R.sup.3 may be bonded to each other to form a heterocycle).

The invention relates to formulations of aqueous dispersion adhesives on the basis of aqueous polyurethane or polyurethane-urea dispersions and the use of the adhesive formulations for bonding foam substrates according to the spray coagulation method.

Embodiments of the present disclosure are directed towards water-based compositions that include a reaction product formed by reacting a polyol and an aminopolycarboxylic compound.

The invention relates to a water-based barrier adhesive comprising: a polyurethane; at least one water-soluble polymer, wherein the water-soluble polymer comprises at least one hydroxyl group; and water; a barrier film comprising the same; a method for preparing the same; and the use thereof in food packaging.

The present disclosure provides layered collagen materials comprising one or more collagen/polymer matrix layers. The collagen/polymer matrix layer(s) are formed of a collagen blended with one or more polymers. The collagen blended within the polymer(s) can be dissolved within the polymer(s). The one or more collagen/polymer matrix layers can be attached to a substrate layer, for example a fabric layer.

Described is a process for film lamination, wherein an aqueous laminating adhesive is applied to a carrier film by means of a gravure roller system (direct gravure coating system), wherein the carrier film and/or an optional substrate are transparent, and the aqueous laminating adhesive comprises (a) an adhesive polymer dispersed in the aqueous phase and (b) a polyalkylene glycol dissolved in the aqueous phase, selected from polyethylene glycol and polypropylene glycol.

The disclosure relates to a polyurethane prepolymer and corresponding crosslinked network polymer incorporating lignin as a natural polyol in the polyurethane system. The polyurethane prepolymer includes a reaction product between an isocyanate, lignin, and a cyclic alkyl carbonate. The reaction product includes (i) free isocyanate groups and/or free hydroxyl groups, (ii) urethane linking groups between residues of lignin aliphatic hydroxyl groups and the isocyanate, (iii) ester linking groups between residues of lignin aromatic hydroxyl groups and a ring-opened form of the cyclic alkyl carbonate, and (iv) optionally urethane linking groups between residues of the ring-opened cyclic alkyl carbonate and the isocyanate. The polyurethane polymer can be a networked, crosslinked polymerization product of the prepolymer reaction product, for example in combination with a lignin curing agent. The polyurethane polymer can be used as a coating on a substrate, an adhesive joining multiple substrates, etc.

The present invention relates to a composition, preparation and use thereof, and a product coated with the composition. The composition comprises: (a) a polyurethane polymer which is a reaction product comprising the following components: (a1) a polyisocyanate, (a2) a compound having an isocyanate-reactive group, which comprises a polymer polyol selected from one or more of the following: a polyether polyol and a polyolefin polyol, (a3) optionally an emulsifier, (a4) optionally a solvent, and (a5) optionally a reactive diluent; (b) an organic antioxidant in an amount of 0.01 wt % to 2.4 wt %, based on the total weight of solid components of the composition; (c) a chelating agent; and (d) water. The composition according to the present invention has good high-temperature yellowing resistance.

The invention relates to formulations of aqueous dispersion adhesives on the basis of aqueous polyurethane or polyurethane-urea dispersions and the use of the adhesive formulations for bonding foam substrates according to the spray coagulation method.