Abstract:
Materials prepared from polydienes, such as poly(cyclohexadiene), and hydrophilic polymers, such as poly(alkylene oxide), are described. Methods of making the materials and their use in fuel cell membranes, batteries, breathable chemical-biological protective materials, and templates for sol-gel polymerization are also provided. The materials can be crosslinked and sulfonated, and can include copolymers and polymer blends.
Abstract:
A block terpolymer for use in photocurable compositions, flexographic printing plates or hot melt adhesives having a molecular structure according to the general formula: A-I-B-I-A (1 ) or (A-I-B)n-X (2), wherein each A is independently a polymer block of predominantly an aromatic vinyl compound, each I is predominantly isoprene, each B is predominantly butadiene, n is an integer equal to or greater than 2, and X is the residue of a coupling agent, and wherein: (a) the weight ratio of I to B is 30:70 to 70:30; (b) the aromatic vinyl compound content of the block copolymer is from about 14 to about 45 %; (c) the B block has a l,2-vinyl bond content in the range of from about 20 to about 90 mol%; and (d) uncoupled triblock, S-I-B in the range of fram about 2% to about 60%.
Abstract:
A lens-forming thermoplastic composition of matter has a crystallinity, as determined in accord with differential scanning calorimetry of from 0 percent to less than 1 percent when the composition comprises a hydrogenated vinyl aromatic/isoprene block copolymer or a crystallinity, as determined in accord with differential scanning calorimetry of from more than 0 percent to less than 1 percent when the composition comprises a hydrogenated vinyl aromatic/butadiene block copolymer. The composition has a birefringence, measured at a wavelength of 633 nanometers, within a range of from 0 to less than 6 x 10 -6 . Molding a melt of these compositions occurs at temperatures within a range from the hydrogenated block copolymer's glass transition minus 20°C to the glass transition temperature minus 90°C. The compositions suitably form lenses such as an optical pick-up lens, which may be aspherical or have at least one of an irregular surface configuration, a non-uniform thickness or an irregular and non-uniform cross-section.
Abstract:
Polymers having an improved ability to entrain water are characterized, in some embodiments, by unusual humidity-induced phase transitions. The described polymers (e.g., hydrophilically functionalized block copolymers) have a disordered state and one or more ordered states (e.g., a lamellar state, a gyroid state, etc.). In one aspect, the polymers are capable of undergoing a disorder-to-order transition while the polymer is exposed to an increasing temperature at a constant relative humidity. In some aspects the polymer includes a plurality of portions, wherein a first portion forms proton-conductive channels within the membrane and wherein the channels have a width of less than about 6 nm. The described polymers are capable of entraining and preserving water at high temperature and low humidity. Surprisingly, in some embodiments, the polymers are capable of entraining greater amounts of water with the increase of temperature. The polymers can be used in Polymer Electrolyte Membranes in fuel cells.
Abstract:
The present invention relates to adhesive compositions that comprise: i. at least one block copolymer (i)(a) of the formula A-I-A (1) or (A-I) n X (2) and at least one block copolymer (i)(b) of the formula A-(I/B)-A (3) or [A-(I/B)] n -X (4), wherein each A independently is a polymer block of an aromatic vinyl compound, I is a poly(isoprene) polymer block, (I/B) is a mixed random polymer block of isoprene and butadiene in a weight ratio I:B of from about 20:80 to about 80:20, n is an integer equal to or greater than 2 and X is the residue of a coupling agent, and wherein the weight ratio between said block copolymers (i)(a) and (i)(b) is such that the overall butadiene content in component (i) is less than 20 wt%, ii. a tackifying resin, and iii. optionally one or more plasticizers. Tapes, labels or bandages that are obtained by applying the adhesive compositions of the present invention to a carrier are also provided.
Abstract:
A styrene-isoprene block copolymer that includes at least two polymerized styrene blocks alternating with at least one polymerized isoprene block and has a spin bonding temperature that is below its degradation temperature.
Abstract:
Disclosed is a thermoplastic gel composition that can be fabricated into an article, such as an air freshener or a gasket, and then be converted into a thermoset gel composition by exposure to radiation. The thermoset composition has better slump resistance at high temperatures compared to the thermoplastic composition. Prior to irradiation, the composition is a thermoplastic and so it can be easily mixed and formed into an article.
Abstract:
Metal complexes, catalyst compositions containing the metal complexes, and processes for making the metal complexes and the catalyst compositions are described for the manufacture of polymers from ethylenically unsaturated addition polymerizable monomers. The metal complexes have chemical structures corresponding to one of the following formulae (Ia) (Ib) (VII) wherein M .and M .are metals; T is nitrogen or phosphorus; P is a carbon, nitrogen or phosphorus atom; groups R , R and R may be linked to each other; Y is a divalent bridging group; X, X , and X are anionic ligand groups with certain exceptions; D is a neutral Lewis base ligand; and s, o, k, i, ii, p, m, a, b, c, d, e, t, and y are numbers as further described in the claims.
Abstract:
A process for producing an epoxidized diene polymer which comprises: dispersing or suspending a diene polymer (C) having a particle diameter in terms of sphere diameter of 0.05 to 20 mm either in a medium (A) in the presence of powder particles (B) insoluble therein or in a water medium in the presence of a phenolic stabilizer and/or phosphorus compound stabilizer; and epoxidizing the diene polymer (C) in the dispersed or suspended state with an epoxidizing agent. Thus, an epoxidized diene polymer having excellent thermal stability is obtained. By the process, the epoxidation of the diene polymer (C) in a solid state and the production and purification of the target polymer are economically conducted. The process is free from various problems associated with the epoxidation of a diene polymer dissolved in a solvent.