A direct and simple method to control cell size in a polyurethane foam is disclosed. Polyurethane foam is made by mixing prepolymer with foam-forming ingredients comprising isocyanate and water which react to give carbon dioxide. The reaction is driven by a catalyst and results in a foam structure with cells of a particular size. Using the addition of a pre-determined amount of mineral oil, the coalescence of neighboring cells of the foam structure may be advantageously controlled to form a cell structure with a desired average cell size.

A hybrid copolymer composition includes: a first proportion of an aliphatic-diisocyanate terminated polyol; a second proportion of an aromatic diisocyanate; a third proportion of an aromatic diamine curative configured to extend a chain length of the aliphatic-diisocyanate-terminated polyol and the aromatic diisocyanate; a fourth proportion of a polyester polyol configured to polymerize with the aliphatic-diisocyanate-terminated polyol; and a fifth proportion of a high functionality dendrimer configured to crosslink polymer chains of the aliphatic-diisocyanate-terminated polyol. Further, the hybrid copolymer can be configured to form a protective film layer in a foldable electronic display, the foldable electronic display including: a cover layer arranged over the protective film layer; and an array of organic light-emitting diodes arranged beneath the protective film layer.

The present inventions concerns compositions for producing thermoset polyurethanes, comprising polyisocyanates and polyols selected from a list consisting of allicyclic, aromatic compounds and branched polyesters. The films obtained from these compositions exhibit a high transparency, high thermal stability and good chemical resistance, and a method to produce the same. The said polyurethane films can be widely used in electronics industry where high transparency, high thermal resistance and good chemical resistance are the main requirements. Particularly, these films can be used as the substrates for conductive coatings and barrier coatings. These functionally coated films are particularly useful in applications such as touch panels or photo-voltaic cells.

New shape memory polymer compositions, methods for synthesizing new shape memory polymers, and apparatus comprising an actuator and a shape memory polymer wherein the shape memory polymer comprises at least a portion of the actuator. A shape memory polymer comprising a polymer composition which physically forms a network structure wherein the polymer composition has shape-memory behavior and can be formed into a permanent primary shape, re-formed into a stable secondary shape, and controllably actuated to recover the permanent primary shape. Polymers have optimal aliphatic network structures due to minimization of dangling chains by using monomers that are symmetrical and that have matching amine and hydroxl groups providing polymers and polymer foams with clarity, tight (narrow temperature range) single transitions, and high shape recovery and recovery force that are especially useful for implanting in the human body.

This invention relates to a composition for a preparation of polyurethane dispersion, comprising bio-based polyol as shown in structure (I) and polyhydroxy fatty acid compound as shown in structure (II): wherein, R represents a polyhydric alcohol unit that is selected from aliphatic polyhydric alcohol, alicyclic polyhydric alcohol, cyclic polyhydric alcohol, aromatic polyhydric alcohol, or optionally, cyclic polyhydroxyl having heteroatom; R\ represents a hydrocarbon unit obtained from a molecular chain of unsaturated fatty acid having 14-24 carbon atoms and having from 1-6 pairs of vicinal diol group per one molecular chain of such unsaturated fatty acid; n represents an integer from 2 to 8 of an ester group obtained from a reaction of polyhydric alcohol and unsaturated fatty acid; wherein said composition is prepared from a process comprising the steps of: i. mixing fatty acid comprising unsaturated fatty acid and polyhydric alcohol at a ratio of 1 mole equivalent or more of carboxylic group from unsaturated fatty acid per a hydroxy group from polyhydric alcohol; ii. adding organic acid and peroxide compound into the mixture from step i.; iii. adding nucleophilic substance into the mixture from step ii. under acidic condition. ##STR00001##

A two-component polyurethane composition made of a polyol component and a polyisocyanate component, wherein the polyol component includes at least one reaction product of castor oil with ketone resins A1, at least one aliphatic triol A2, an aliphatic diol A3, and a polybutadiene polyol A4. The polyurethane composition has high strength and only a minor dependence of mechanical properties, especially of strength, on temperature, especially in the range from 60 C. to +60 C. Moreover, the composition is capable of curing without blistering under ambient conditions, even in the presence of substrates that typically promote foaming reactions owing to the presence of residual moisture, for example glass fiber weave.

New shape memory polymer compositions, methods for synthesizing new shape memory polymers, and apparatus comprising an actuator and a shape memory polymer wherein the shape memory polymer comprises at least a portion of the actuator. A shape memory polymer comprising a polymer composition which physically forms a network structure wherein the polymer composition has shape-memory behavior and can be formed into a permanent primary shape, re-formed into a stable secondary shape, and controllably actuated to recover the permanent primary shape. Polymers have optimal aliphatic network structures due to minimization of dangling chains by using monomers that are symmetrical and that have matching amine and hydroxyl groups providing polymers and polymer foams with clarity, tight (narrow temperature range) single transitions, and high shape recovery and recovery force that are especially useful for implanting in the human body.

Provided is a rubber member for downhole tools, of which a decrease rate of 50% strain compressive stress after immersion for 24 hours in 150 C. water relative to 50% strain compressive stress before immersion is not less than 5%, and preferably not less than 50%. The rubber member is suitable for a seal member, ball sealer, ball seat, and a protecting member. Also provided is a downhole tool comprising the rubber member, and a method for recovering a hydrocarbon resource using the downhole tool.

A photo-curable composition can include a photo-curable resin and a photoinitiator. The photo-curable composition can typically have a shear viscosity of less than 1 Pa.Math.s at 100? C. at a shear rate of 50 s.sup.?1 and can typically include a first prepolymer, a second prepolymer, and a reactive diluent.

A system and method for forming a polyurethane foam includes supplying an isocyanate component from a source of isocyanate to a proportioner. A resin component from a source of resin is supplied to a metering unit and an additive having an unstable state from a source of additive is supplied to the metering unit. The resin component and the additive form a reactive mixture when combined. The system and method includes delivering the reactive mixture by the metering unit to an accumulator and storing the reactive mixture in the accumulator. The system and method further includes demanding a supply of the reactive mixture with the proportioner and supplying the reactive mixture by the accumulator to the proportioner and mixing the reactive mixture with the isocyanate component by the proportioner to form the polyurethane foam.