Disclosed herein are methods for reprocessing polyurethane compositions such as polyurethane foams. The method comprises introducing a polyurethane composition into a compounding device, heating the polyurethane composition to an effective bond-exchange temperature, and compounding the polyurethane composition for an effective bond-exchange time.

An azeotropic-like composition containing 2-chloro-1,3,3,3-tetrafluoropropene and 1-chloro-3,3,3-trifluoropropene is provided. The azeotropic-like composition according to the present invention is non-flammable, has little influence on the environment, and has substantially the same composition ratio in the liquid phase and the gas phase. By use of an azeotropic-like composition according to the present invention, a washing detergent, a solvent, a silicone solvent, a foaming agent, a coolant, a heating medium for a heat pump, and a high temperature working fluid that are non-flammable, have little influence on the environment, and have substantially the same composition ratio in a liquid phase and a gas phase thereof may be provided.

In an example, a process includes chemically reacting a polyhydroxyalkanoate (PHA) material having a carboxylic-acid terminated side-chain with an azide material to form a polyisocyanate material.

A polyester polyol is formed in a polycondensation reaction between an aromatic dicarboxylic acid, a polyol, and an epoxy compound having a straight chain alkyl or alkenyl group having at least six carbon atoms. The polyester polyol exhibits excellent compatibility with hydrocarbon blowing agents. As such, it is a useful component in rigid polyurethane foam formulations that are contain hydrocarbon blowing agents.

What are described are (a) a composition suitable for production of rigid polyurethane foam, comprising at least one isocyanate component, a polyol component, optionally a catalyst that catalyses the formation of a urethane or isocyanurate bond, optionally blowing agents, where the composition additionally comprises hydrocarbons HC, polyether-modified siloxane and optional polyalkylsiloxane, (b) a process for producing rigid polyurethane foam using hydrocarbons HC, polyether-modified siloxane and optional polyalkylsiloxanes, (c) the rigid polyurethane foam thus obtainable and (d) the use thereof.

A rigid polyurethane foam formulation comprising a polyester polyol having a hydroxyl number of from 150 to 600 mg KOH/g and a functionality of at least 2, a blowing agent comprising water and an auxiliary blowing agent, a non-silicone organic surfactant, greater than 0.1% to less than 3.7% of a cyclic siloxane, by weight based on the total weight of the foam formulation, a catalyst, and optionally a flame retardant; and a polyisocyanate; such that the isocyanate index is in the range of from 100 to 500, a rigid polyurethane foam formed from the foam formulation; and a method of forming a rigid polyurethane foam.

Provided are oriented biodegradable thermoplastic polyurethane films. The films may be prepared by extruding and drawing biodegradable polyurethane films. The polyurethanes may be prepared from biodegradable polyols and/or biodegradable chain extenders. The films possess high tensile strength yet are degradable under biological conditions. The films may be utilized in the fabrication of devices, particularly implantable medical devices.

The present invention addresses the problem of providing a surface protection film for a flexible display with which films are not adhered to each other. As a solution, provided is the surface protection film for a flexible display that has a protection layer made of polyurethane as an outermost surface thereof, the polyurethane having a tan δ peak temperature of 20° C. or more.

A process and composition is described for the inclusion of polyether polyols in concentrations greater than 10% loading on the B-side formulation with a catalyst package less than 1% loading on the B-side formulation. In one specific example, the use of glycerin as a fluorine ion scavenger is utilized to improve performance of the polyurethane systems through a twelve-month shelf life.

The present disclosure relates to improving insulation properties of foams by employing an azeotropically-modified blowing agent that preserves or improves R-value at various temperatures such as lower than ambient temperatures (below 24° C.). The present disclosure also provides foams with improved long-term thermal resistance (LTTR).