The present invention provides a copolymer used as oily gelling agent with which a stable oily gelled composition can be prepared.

The copolymer of the present invention is characterized by comprising a hydrophobic monomer represented by the following general formula (1) and a hydrophilic monomer represented by the following general formula (2) and/or the following general formula (3).

##STR00001##

(In formula (1), R.sup.1 is a straight-chain or branched-chain alkyl group having 16 to 22 carbon atoms. R.sup.2 is a hydrogen atom or a methyl group.)

##STR00002##

(In formula (2), R.sup.3 is a hydrogen atom, a glyceryl group, a straight-chain or branched-chain hydroxyalkyl group having 1 to 4 carbon atoms, or a polypropylene glycol group represented by —(C.sub.3H.sub.6O).sub.nH (here, n is an integer of 2 to 10). R.sup.4 is a hydrogen atom or a methyl group.)

##STR00003##

(In formula (3), R.sup.5 is a hydrogen atom or a methyl group, R.sup.6 is a straight-chain or branched-chain alkyl group or hydroxyalkyl group having 1 to 4 carbon atoms, or a substituent represented by the following structural formula (4).)

##STR00004##

The invention provides novel bromine-containing polymers which have excellent heat resistance and are capable of imparting flame retardance or novel flame-retardant, bromine-containing polymers which have excellent heat resistance and optical characteristics, and methods for producing such polymers. The invention relates to a polymer which includes structural units of the following general formula (1):

##STR00001##

wherein R.sub.1s, R.sub.2s, m, p and the asterisks are as defined in the specification and the claims, and
to a method for producing such polymers.

The invention provides novel bromine-containing polymers which have excellent heat resistance and are capable of imparting flame retardance or novel flame-retardant, bromine-containing polymers which have excellent heat resistance and optical characteristics, and methods for producing such polymers. The invention relates to a polymer which includes structural units of the following general formula (1):

##STR00001##

wherein R.sub.1s, R.sub.2s, m, p and the asterisks are as defined in the specification and the claims, and
to a method for producing such polymers.

A method for making reduction sensitive nano micelles comprising: 1) dissolving taurine in distilled water, and adding sodium hydroxide solution; 2) dissolving acryloyl chloride in dichloromethane, reacting at 25° C.; dissolving lipoic acid in toluene and adding hydroxyethyl methacrylate, reacting at 85° C.; 3) dissolving N-acryloyltaurine and lipoic acid methacryloyloxyethyl ester and reacting at 60˜65° C., dropping the polymer solution into deionized water, adding dithiothreitol and reacting at 25˜30° C. to obtain reduction sensitive nano micelles after freeze-drying. The nano micelles have regular morphology and uniform distribution, and can be used as drug carriers for controlled release.

A method for making reduction sensitive nano micelles comprising: 1) dissolving taurine in distilled water, and adding sodium hydroxide solution; 2) dissolving acryloyl chloride in dichloromethane, reacting at 25° C.; dissolving lipoic acid in toluene and adding hydroxyethyl methacrylate, reacting at 85° C.; 3) dissolving N-acryloyltaurine and lipoic acid methacryloyloxyethyl ester and reacting at 60˜65° C., dropping the polymer solution into deionized water, adding dithiothreitol and reacting at 25˜30° C. to obtain reduction sensitive nano micelles after freeze-drying. The nano micelles have regular morphology and uniform distribution, and can be used as drug carriers for controlled release.

When a polymer gel has excellent mechanical strength and an ability to maintain surface wetness for a longer time, the polymer gel may be very widely applied to a variety of fields. The present disclosure provides example embodiments of a polymer gel having excellent mechanical strength and an ability to maintain surface wetness for a longer time. Further, the present disclosure provides example embodiments of a method of preparing the polymer gel.

When a polymer gel has excellent mechanical strength and an ability to maintain surface wetness for a longer time, the polymer gel may be very widely applied to a variety of fields. The present disclosure provides example embodiments of a polymer gel having excellent mechanical strength and an ability to maintain surface wetness for a longer time. Further, the present disclosure provides example embodiments of a method of preparing the polymer gel.

Process for producing aqueous compositions of water-soluble polymers from aqueous polymer gels by comminuting and mixing the aqueous polymer gel with an aqueous liquid by means of a comminution unit comprising a flow-chamber, a sheet-like molding tool and rotating cutting means, wherein a stream of an aqueous liquid flows through the flow chamber, aqueous polymer gel is pressed through the sheet-like molding tool, cutting the thus formed gel strands into slices, dispersing them in the aqueous liquid and homogenizing the thus obtained mixture.

Process for producing aqueous compositions of water-soluble polymers from aqueous polymer gels by comminuting and mixing the aqueous polymer gel with an aqueous liquid by means of a comminution unit comprising a flow-chamber, a sheet-like molding tool and rotating cutting means, wherein a stream of an aqueous liquid flows through the flow chamber, aqueous polymer gel is pressed through the sheet-like molding tool, cutting the thus formed gel strands into slices, dispersing them in the aqueous liquid and homogenizing the thus obtained mixture.

A gypsum slurry includes water, a hydraulic component including calcium sulfate hemihydrate and a linear polycarboxylate dispersant. The linear polycarboxylate anionic dispersant includes a first monomeric repeating unit and a second monomeric repeating unit. The first repeating unit of the linear polycarboxylate dispersant is an olefinic unsaturated carboxylic acid repeating unit or salt thereof. The second repeating unit of the linear polycarboxylate dispersant is a vinyl sulfonate. The slurry can be made into a gypsum panel. Methods of making gypsum slurry and a gypsum panel are also disclosed.