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 m 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 m 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.

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.

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 unitsderived from at least one hydrophobically as sociative monomer, preferably at least one unsaturated hydrophobically associating monomer.

The invention relates to a thickened preparation comprising a polymer which can be obtained by radical emulsion polymerization of at least one acidic vinyl monomer or salt thereof, at least one non-ionic vinyl monomer, in particular preferably a hydrophobic non-ionic vinyl monomer, at least one monomer containing an unsaturated terminal group and a polyoxyalkyene portion, at least one crosslinking monomer, optionally a protective colloid, and is characterized in that the polymerization is controlled such that the gelling effect occurs at least at times, which is achieved by the monomer addition (dosing time) taking place for 40 minutes, particularly preferably for 30 minutes.

A pressure-sensitive adhesive film which is a pressure-sensitive adhesive film comprising a thermoplastic resin, wherein a maximum peak temperature of tan ? is 0? C. or more and 52? C. or less, a shear storage elastic modulus at 20? C. is 3?10.sup.5 Pa or more, and a proportion of an undissolved component in dissolution of 1.0 g of the pressure-sensitive adhesive film in 10 g of isopropyl alcohol is 35% by mass or more and 100% by mass or less.

A pressure-sensitive adhesive film which is a pressure-sensitive adhesive film comprising a thermoplastic resin, wherein a maximum peak temperature of tan ? is 0? C. or more and 52? C. or less, a shear storage elastic modulus at 20? C. is 3?10.sup.5 Pa or more, and a proportion of an undissolved component in dissolution of 1.0 g of the pressure-sensitive adhesive film in 10 g of isopropyl alcohol is 35% by mass or more and 100% by mass or less.

The invention relates to a polymer which can be obtained by radical emulsion polymerization of at least one acidic vinyl monomer or salt thereof, at least one non-ionic vinyl monomer, in particular preferably a hydrophobic non-ionic vinyl monomer, at least one monomer containing an unsaturated terminal group and a polyoxyalkyene portion, at least one crosslinking monomer, optionally a protective colloid, and is characterized in that the polymerization is controlled such that the gelling effect occurs at least at times, which is achieved by the monomer addition (dosing time) taking place for 40 minutes, particularly preferably for 30 minutes.