Abstract: 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy]-1,1-dimethylethyl}-2,4,8,10-tetraoxaspiro[5.5] undecane having a novel crystalline structure which, when subjected to Cu-K.sub..alpha. X-ray diffraction, shows sharp X-ray diffraction peaks at angles of diffraction, 2.theta.=4.2.degree. and 2.theta.=10.6.degree.. Also provided is a method for producing this compound.

Abstract: Method for producing 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dime thylethyl}-2,4,8,10-tetraoxaspiro[5.5]undecane by ester exchange of a 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)-propionic acid ester with 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]-undecane at a temperature of 170.degree.-250.degree. C. using a calcium compound as a catalyst in an amount of 0.05-1.5 moles per mole of the 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]-undecane.

Abstract: An ultraviolet ray absorbing agent comprising as an active ingredient a spiro compound having a spiro ring structure in the molecule, said spiro compound being represented by the general formula ##STR1## wherein, Y is ##STR2## A is ##STR3## R.sub.1 is hydrogen, halogen, lower alkyl of 1 to 4 carbon atoms, lower alkoxyl of 1 to 4 carbon atoms, carboxyl, or sulfo, R.sub.2 is hydrogen or alkyl of 1 to 12 carbon atoms, R.sub.3 and R.sub.4 are alkyls of 1 to 12 carbon atoms, X is methylene, oxygen, imino, sulfur, sulfinyl, or sulfonyl, and n is an integer of 1 to 12.

Abstract: Method for the purification of 3,9-bis{2-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]-1,1-dime thylethyl} -2,4,8,10-tetraoxaspiro[5.5]undecane, to form crystals having a crystalline structure which, when subjected to Cu-K.sub..alpha. X-ray diffraction, show sharp X-ray diffraction peaks at angles of diffraction, to 2.theta.=2.8.degree., 2.theta.=8.7.degree. and 2.theta.=11.7.degree., by recrystallizing the ester at a temperature lower than 40.degree. C. using as a recrystallization solvent, A C.sub.5 -C.sub.10 alicyclic hydrocarbon, which may contain a limited amount of certain other solvents, or using a mixed solvent of a C.sub.5 -C.sub.10 aliphatic hydrocarbon and at least one other certain solvent in a certain weight ratio.

Abstract: A stabilizer for synthetic resins containing as an effective ingredient a hindered piperidine compound represented by the general formula: ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.18 alkyl group, R.sub.2 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, n represents an integer of 1 to 12, and C.sub.n H.sub.2n represents a straight-chain or branched alkylene group.

Abstract: There are provided acetylenecarbamide derivatives of the formula: ##STR1## wherein A represents ##STR2## in which R.sub.1 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group, and R.sub.2 represents a C.sub.2 -C.sub.9 alkyl group. These derivatives are useful as stabilizers for polymeric organic substances susceptible to thermal and oxygen-induced degradation.

Abstract: Polyurethanes are stabilized against yellowing by incorporating a phenolic type compound represented by the general formula (I) ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.3 alkyl group and at least one member selected from a benzotriazole type light stabilizer and a hindered amine type stabilizer.

Abstract: Piperidine derivatives represented by the general formula (1) ##STR1## (wherein R.sub.1 is a hydrogen atom, an alkyl group of 1 to 3 carbon atoms or an acyl group of 2 to 18 carbon atoms; and k, m and n each are independently an integer of 1 to 3), a process for producing said derivatives, and stabilizers for organic substances containing said derivatives as an active component.

Abstract: Polyolefin resins are thermally stabilized and are also stabilized against yellowing from nitrogen oxide gases by incorporating 3,9-bis[2- 3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy -1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.

Abstract: Polyacetal resin compositions are stabilized to heat, oxygen and light by incorporation a phenolic type compound represented by the formula ##STR1##

Abstract: A vulcanization accelerator containing as an active ingredient a compound having at least one dithiocarbamoyl group, which is shown by the following general formula [I], a means for accelerating vulcanization by adding said compound and rubber products having improved quality which is attained by using said compound as a vulcanization accelerator: ##STR1## wherein R.sup.1 stands for an alkyl group having one to 12 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms or an aralkyl group having 7 to 13 carbon atoms, A stands for a group shown by the formula ##STR2## or metallic atom; in which x represents zero or an integer of 1 to 5, R.sup.

Abstract: The present invention relates to a piperidine derivative represented by the general formula (I), ##STR1## wherein R.sub.1 is a uni- or divalent carboxylic acid residue, R.sub.2 is a hydrogen atom or a C.sub.1 -C.sub.3 alkyl or C.sub.1 -C.sub.18 acyl group, l is an integer of 1 to 3 and n is 1 or 2,its production and a stabilizer for organic substances containing it as an effective ingredient.

Abstract: The present invention relates to a piperidine derivative represented by the general formula (I), ##STR1## wherein R.sub.1 and R.sub.2 independently represent a hydrogen atom or a C.sub.1 -C.sub.3 alkyl or C.sub.2 -C.sub.20 acyl group, R.sub.3 represents a hydrogen atom or a C.sub.1 -C.sub.20 alkyl, C.sub.6 -C.sub.20 aryl, C.sub.7 -C.sub.20 aralkyl or C.sub.2 -C.sub.20 acyl group, and l represents 1 to 3, and a stabilizer for organic substances containing said piperidine derivative as an effective ingredient.

Abstract: Synthetic resins, such as polyolefins, are stabilized with phenolic compounds of the formula ##STR1## where n is 1 to 4 and A is ##STR2## where R.sub.1 is C.sub.1 -C.sub.3 alkyl.

Abstract: A stabilizer for synthetic resins containing as an effective component a mixture comprising a phenol type compound (I) represented by the formula (I), ##STR1## wherein R.sub.1 represents a C.sub.1 -C.sub.3 alkyl group, and at least one sulfur type compound (II) selected from the group consisting of compounds represented by the formula (II-1), ##STR2## wherein R.sub.2 represents a C.sub.4 -C.sub.20 alkyl group, and compounds represented by the formula (II-2), ##STR3## wherein R.sub.3 represents a C.sub.3 -C.sub.18 alkyl group, and R.sub.4 and R.sub.5 independently represent a hydrogen atom or a C.sub.1 -C.sub.6 alkyl group, the weight ratio of phenol type compound (I) to sulfur type one (II) being 1 to 0.5-15.

Abstract: A rubber composition comprising vulcanizable natural or synthetic rubber and a sulfide resin produced by (1) reacting a component (A) with a componet (B), followed by reacting with a component (D), or (2) reacting a component (A) with a component (B), followed by reacting with a component (C) and a component (D) simultaneously or sequentially, and if desired reacting the resulting phenol resin with an acylating agent, the component (A) being a phenol compound of the following formula, and/or an acylated compound thereof, ##STR1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom, a hydroxyl, carboxyl, amino, C.sub.1 -C.sub.18 alkyl, C.sub.3 -C.sub.10 cycloalkyl, C.sub.3 -C.sub.10 cycloalkenyl or C.sub.7 -C.sub.12 aralkyl group or a phenyl group unsubstituted or substituted with at least one C.sub.1 -C.sub.