A polyvinyl alcohol-based resin composition including a modified vinyl alcohol-based polymer (A) in which a polyoxyalkylene unit represented by a general formula (I) is bonded to a polyvinyl alcohol chain and a modified vinyl alcohol-based polymer (B) having a double bond in a polyvinyl alcohol chain.

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(In which: R.sub.1 and R.sub.2 are independently, a methyl group, an ethyl group or a hydrogen atom, and R.sub.3 is an alkyl group or a hydrogen atom. N represents a number of repeating units and is an integer of 5≤n≤70.)

A polyvinyl alcohol-based resin composition including a modified vinyl alcohol-based polymer (A) in which a polyoxyalkylene unit represented by a general formula (I) is bonded to a polyvinyl alcohol chain and a modified vinyl alcohol-based polymer (B) having a double bond in a polyvinyl alcohol chain.

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(In which: R.sub.1 and R.sub.2 are independently, a methyl group, an ethyl group or a hydrogen atom, and R.sub.3 is an alkyl group or a hydrogen atom. N represents a number of repeating units and is an integer of 5≤n≤70.)

Provided is a dispersion stabilizer for suspension polymerization, the dispersion stabilizer making it possible to obtain, through suspension polymerization of a vinyl compound such as vinyl chloride, resin particles having uniform particle diameters and few large particles, and also having a high porosity and a large plasticizer absorption. A modified vinyl alcohol polymer has a hydrodynamic radius (Rh) (unit: nm) that satisfies equation (1) where x is the viscosity average polymerization degree. (1): 0.186x.sup.0.542×1.30≥Rh≥0.186x.sup.0.542×1.06

Provided is a dispersion stabilizer for suspension polymerization, the dispersion stabilizer making it possible to obtain, through suspension polymerization of a vinyl compound such as vinyl chloride, resin particles having uniform particle diameters and few large particles, and also having a high porosity and a large plasticizer absorption. A modified vinyl alcohol polymer has a hydrodynamic radius (Rh) (unit: nm) that satisfies equation (1) where x is the viscosity average polymerization degree. (1): 0.186x.sup.0.542×1.30≥Rh≥0.186x.sup.0.542×1.06

A transparent body production method that includes subjecting the compound represented by formula (1) to heating at a temperature equal to or greater than the melting point of said compound. In formula (1), each of W.sup.1 and W.sup.2 is the group represented by formula (2) in which the ring Z is an aromatic hydrocarbon ring, X is a single bond or —S—, R.sup.1 is a single bond or an alkylene group having 1-4 carbon atoms, R.sup.2 is a specific substituent, and m is an integer of 0 or higher, the group represented by formula (4) is —OH— or a (meth)acryloyloxy group, each of the rings Y.sup.1 and Y.sup.2 is an aromatic hydrocarbon ring, R is a single bond or a specific divalent group, each of R.sup.3a and R.sup.3b is —CN, a halogen group, or a monovalent hydrocarbon group, and each of n1 and n2 is an integer of 0-4.

A preformed thermoplastic polymer is dispersed into a polyol via a mechanical dispersion process. A stabilizer is present to stabilize the dispersed polymer particles. An antisolvent is also present. The antisolvent has been found to lead to smaller particle size and increased dispersion stability.

A preformed thermoplastic polymer is dispersed into a polyol via a mechanical dispersion process. A stabilizer is present to stabilize the dispersed polymer particles. An antisolvent is also present. The antisolvent has been found to lead to smaller particle size and increased dispersion stability.

The present invention relates to the use of hydrophobically associative copolymers as binders for pelletizing metal containing ores such as iron containing ores. The copolymers comprise monomer units derived from at least one hydrophobically as sociative monomer, preferably at least one unsaturated hydrophobically associating monomer.

Polymer polyols are made in a seeded process, in which styrene and acrylonitrile are polymerized in the presence of a base polyol, a seed dispersion and a solvent. The seed dispersion contains an unsaturated macromer. The process produces a polymer polyol in which the dispersed phase particles have a particle size of 1 to 3 μm and a particle size span of less than 1.25. The polymer polyols are very useful for making flexible polyurethane foam for cushioning applications, in which high airflows and good load bearing are needed.

Polymer polyols are made in a seeded process, in which styrene and acrylonitrile are polymerized in the presence of a base polyol, a seed dispersion and a solvent. The seed dispersion contains an unsaturated macromer. The process produces a polymer polyol in which the dispersed phase particles have a particle size of 1 to 3 μm and a particle size span of less than 1.25. The polymer polyols are very useful for making flexible polyurethane foam for cushioning applications, in which high airflows and good load bearing are needed.