Abstract: A pigment dispersing agent for paints is a combination of particular amine compound and particular acrylic copolymer or a combination of particular amine compound, particular acrylic copolymer and particular polyester resin. This pigment dispersing agent is applicable to both acrylic resin series paints and polyester resin series paints.

Abstract: Photopolymerization initiators of the general formula: ##STR1## wherein R.sub.1 and R.sub.1 ' independently stand for a tertiary alkyl group or a tertiary aralkyl group and R.sub.2 and R.sub.2 ' independently stand for a hydrogen atom, a tertiary alkoxy group, or a tertiary aralkyloxy group are disclosed. They are useful for effecting polymerization of radically polymerizable unsaturated compounds.

Abstract: Fluorine-containing aromatic derivatives are produced by the reaction of di(haloacyl)peroxide represented by the general formula: ##STR1## (wherein X stands for a fluorine, chlorine, or hydrogen atom and n for an integer of the value of 1 to 10) with aromatic unsaturated monomers represented by the general formula: ##STR2## (wherein Y stands for hydrogen atom, methyl, ethyl, propyl, acetyl, propionyl, acetyloxy, propionyloxy, methoxy, ethoxy, propoxy, vinyl, isopropenyl, or nitro group, or a halogen atom, R.sup.1 for hydrogen atom, methyl, ethyl, propyl, or butyl group, R.sup.2 for hydrogen atom, methyl or phenyl group, and m for an integer of the value of 1 to 5).

Abstract: High-purity 1,1,3,3-tetramethylbutyl hydroperoxide can be easily and safely produced without the formation of dangerous acetone peroxide, by the reaction of neopentyldimethylcarbinol with hydrogen peroxide in the presence of sulfuric acid.

Abstract: A novel peroxy aryl carbonate which has the both properties of polymerization-initiating and regulating abilities, can be used as a radical polymerization initiator to regulate the polymerization rate, the polymerization degree and molecular weight distribution of the polymer and the like, and therefore produce superior styrene resin and methyl methacrylate syrup.

Abstract: A block copolymer consisting of segments of copolymer A, which is obtained by copolymerizing a (meth)acrylic acid ester monomer with a radically copolymerizable peroxycarbonate and has peroxy groups in its main polymer chain, and segments of (co)polymer B, which is different from copolymer A in the monomer composition and does not contain peroxy groups, can modify matrix resin without deteriorating the mechanical property of the resin.

Abstract: A plastic lens which has high hardness and excellent scratch resistance and can form a transparent and uniform reflection preventing film through vacuum deposition, is produced by mixing(a) diethylene glycol bis(allyl carbonate) with(b) at least one of organic peroxides having a decomposition temperature at selected half-life value for ten hours of not higher than 80.degree. C. and(c) at least one of organic peroxides having a decomposition temperature at selected half-life value for ten hours of 90.degree.-110.degree. C., which have no copolymerizability to the diethylene glycol bis(allyl carbonate) (a), as a polymerization initiator, and polymerizing and casting the resulting mixture in a desired lens-forming mold.

Abstract: The cold flow of fuel oils is improved by adding esters of addition products of epoxides of specifically limited nitrogen-containing compounds with linear saturated fatty acids or a combination of the esters and polymers of one or more monomers selected from the group consisting of olefins, alkyl esters of ethylenically unsaturated carboxylic acids and vinyl esters of saturated fatty acids to fuel oils.

Abstract: A suppository base composition comprising 5-80% by weight of polyethylene glycol, 5-80% by weight of triglyceride of fatty acid having 6-22 carbon atoms and 5-80% by weight of a specifically limited alkylene oxide derivative has a melting point of 30.degree.-60.degree. C., a compatibility with both of a polar drug component and a non-polar drug component, and can provide suppositories having excellent moldability and storage stability.

Abstract: A suppository base composition comprising 5-80% by weight of polyethylene glycol, 5-80% by weight of triglyceride of fatty acid having 6-22 carbon atoms and 5-80% by weight of a specifically limited alkylene oxide derivative has a melting point of 30.degree.-60.degree. C., a compatibility with both of a polar drug component and a non-polar drug component, and can provide suppositories having excellent moldability and storage stability.

Abstract: Glycidyl methacrylate or glycidyl acrylate is produced by reacting methyl methacrylate or methyl acrylate with glycide in the presence of a metal salt of a fatty acid.