The present invention relates to a pressure sensitive adhesive composition comprising a thermoplastic polyurethane and a tackifying resin, which thermoplastic polyurethane is derived from an aromatic diisocyanate and/or a cycloaliphatic diisocyanate, a chain extender, and a polymeric diol and/or a hydrogenated polydiene diol and a hydrogenated polydiene mono-ol, and wherein the number average functionality of the diol and mono-ol ranges from 1.2 to 1.8. Further, the invention relates to a thermoplastic polyurethane for use in pressure sensitive adhesives and to articles containing the pressure sensitive adhesives.

Pressure sensitive adhesives comprising thermoplastic polyurethanes

Thermoplastic polyurethanes are formed from a polydiene diol, preferably a hydrogenated polybutadiene diol, having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, an isocyanate having two isocyanate groups per molecule, and optionally a chain extender having two hydroxyl groups per molecule. The thermoplastic polyurethane composition is prepared by a prepolymer method, preferably a solventless prepolymer method using the branched chain extender.

Use of polydiene diols in thermoplastic polyurethanes

A process for producing composite materials which can be thermally postformed, with a matrix of polylactam produced by means of activated anionic polymerization is offered.

Process for producing compound materials with a polylactam matrix which can be thermally postformed

Molded polyurethanes are filled with a particular filler mixture, including a certain wollastonite or talc as a supplementary filler, to provide a polymer composition having surprising good physical properties and excellent surface quality

Reinforced polymer compositions having excellent distinctness of image

This invention provides a process for producing a polyurethane resin from a hydrogenated polydiene diol or polyol having a functional group equivalent weight of 750 to 10000, a reinforcing agent having a functional group equivalent weight of 30 to 200, and a polyisocyanate. In a preferred embodiment, the process comprises reacting at least one of a polydiene diol or a reinforcing diol or triol with the polyisocyanate at an NCO/functional group molar ratio of 0.4 to 0.7 or a functional group/NCO molar ratio of 0.25 to 0.55 to form a stable reaction product, adding to this reaction product an additional sufficient amount of the polyisocyanate and, as needed, one or both of the polydiene diol or the reinforcing agent to bring the NCO/OH functional group ratio up to from 0.9 to 1.1 and to achieve a polydiene agent content of 35 to 80 wt.% (on solids basis) and a reinforcing agent content of 2 to 17 wt.% (on solids basis), and reacting this final mixture to form a cross-linked polyurethane product. This process can also be carried out at an OH/NCO ratio of 0.9 to 1.1 using a blocked polyisocyanate wherein the intermediate reaction product is a stable polyurethane resin.

Polyurethane compositions made from hydroxy-terminated polydiene polymers

The invention relates to a process for preparing a polymer alloy based upon at least one polyamide polymer, and at least one polymer of the group of polyurethane polymer, polyurea polymer and polyisocyanurate polymer. The invention further relates to a molded object comprising a polyamide polymer, and at least one polymer of the group of polyurethane polymer, polyurea polymer and polyisocyanurate polymer. The invention further comprises a reaction injection molded product composed of an alloy consisting of 1. at least one polymer of the group of a polyurethane polymer, polyurea polymer and polyiso-cyanurate polymer and 2. a polyamide polymer.

Frisch Kurt Charles

Papers

Reaction injection molding process and reaction injection molded products