The use of an alcohol alkoxylate or an alcohol alkoxylate mixture as a concentrated defoamer, antifoamer and/or deaerator wherein the alcohol alkoxylate or alcohol alkoxylate mixture comprises at least an alcohol alkoxylate, wherein the alcohol alkoxylate has a molecular structure as shown in [I]: R—O—(CH.sub.2(CH.sub.3)CHO).sub.m—(CH.sub.2CH.sub.2O).sub.n—H wherein R is a branched and/or linear alkyl group having from 20 to 50 carbon atoms, m=10-40, and n=0-5.

Embodiments relate to a method of producing a modified double metal cyanide complex, a method of producing a monol or polyol that includes providing the modified double metal cyanide complex, an alkylene oxide polymerization process that includes providing the modified double metal cyanide complex, a batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex, and a polyether polyol prepared using the batch, semi-batch, or continuous manufacturing process that includes providing the modified double metal cyanide complex.

Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a cyclic amidine. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of cyclic amidine greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.

Provided is a method for producing a polymer, comprising: a first step for synthesizing a crude polymer by reacting a monomer containing a pyrimidinetrione structure, an imidazolidinedione structure, or a triazinetrione structure, in an organic solvent in the presence of a quaternary phosphonium salt or quaternary ammonium salt; and a second step for precipitating and separating a purified polymer by mixing a poor solvent with the crude polymer-containing solution obtained in the first step.

Disclosed are methods for purifying polyols containing oxyalkylene units that is an alkali metal catalyzed alkoxylation reaction product of an alkylene oxide and an H-functional starter. The methods include neutralizing the alkali metal ions with an aqueous solution comprising water and sulfuric acid, in which: (i) the sulfuric acid is present in an amount of no more than 5% by weight, based on the total weight of the aqueous solution, and (ii) the sulfuric acid is used in an amount of 2% to 10% more than the theoretical amount necessary to neutralize all of the alkali metal ions present. The methods can produce polyols having a low content of 2-methyl-2-pentenal.

The present disclosure discloses a method for preparing a hybrid-type fluorine-based nonionic surfactant capable of producing a high purity material in a high yield. By preparing a hybrid-type fluorine-based nonionic surfactant according to the present disclosure, the surfactant is mass-produced in a high yield through controlling reaction conditions including a solvent.

This invention relates to an in-situ formed polyol blend having an overall functionality of 2 to 3 and an overall hydroxyl number of 50 to 150. A process for preparing these polyol blends is also disclosed. These in-situ formed polyol blends are suitable for preparing viscoelastic flexible polyurethane foams. A process for preparing these foams is also disclosed.

High temperature lubricants for magnetic media are provided. One such lubricant includes fluoroalkyl, fluoroalkenyl, perfluoroalkyl, or perfluoroalkyl ether segments, anchoring functional groups engageable with a protective overcoat of a magnetic recording media, and cyclic functional groups. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

Low-profile thermally stable lubricants for data storage devices are provided based on multi-dentate molecular designs. One such lubricant comprises perfluoroalkyl ether segments, a divalent linking segment, and anchoring functional groups attachable to, or engageable with, a protective overcoat of a magnetic recording medium. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

A (poly)ol block copolymer of general structure B-A-(B)n, wherein block A is a polycarbonate block or polyester block, n=t−1 and t=the number of reactive end residues on block A, wherein block B is a polyethercarbonate block and wherein >70% of the copolymer chain ends are terminated by primary hydroxyl groups, and a process of producing such copolymers and products incorporating such copolymers.