摘要:
The invention provides a piperidine derivative represented by the formula (I)
wherein R 2 and R 3 represent hydrogen atoms or taken tooether form and each R is selected from a hydrogen atom and C 1 -C 3 alkyl groups. These compounds are effective photostabilizers for high polymers even when used in combination with sulfur- containing antioxidants.
摘要:
A method for producing a bisphenol derivative represented by the formula (I), wherein R represents an alkyl group having 1 to 3 carbon atoms, an alkenyl group having 2 to 4 carbon atoms, or a phenyl or 2-phenylethenyl group, and each R' is selected from alkyl groups of 1 to 4 carbon atoms, characterised in that carboxylic acid represented by the formula (II), wherein R is as defined above, is reacted with bisphenol represented by the formula (III), wherein each R' is as defined above, using halogenating agent in the presence of dehydrohalogenating agent. By the present invention, bisphenol derivatives represented by the formula (I) can be produced commercially in one step and in good yields from carboxylic acids without handling a strongly irritative acid halide.
摘要:
An acetylene carbamide derivative is of the general formula (I): wherein each A is wherein R 1 is hydrogen or C 1-4 alkyl, and X is A or hydrogen. Five tetrakis and five tris specific compounds are named. The derivatives can be produced from an acetylene carbamide by reaction with a p-hydroxybenzyl alcohol, a dialkyldithiocarbamate, or formaldehyde and a phenol. The derivatives (1) are useful in an amount of 0.001 to 10% by weight as stabilizers against deterioration by light or oxygen of organic substances such as polymers, rubbers and petroleum products. They may be used together with a sulfur or phosphorus-containing antioxidant or a hindered amine light stabilizer.
摘要:
The invention provides a piperidine derivative represented by the formula (I) wherein R 2 and R 3 represent hydrogen atoms or taken tooether form and each R is selected from a hydrogen atom and C 1 -C 3 alkyl groups. These compounds are effective photostabilizers for high polymers even when used in combination with sulfur- containing antioxidants.
摘要:
An acetylene carbamide derivative is of the general formula (I): wherein each A is wherein R 1 is hydrogen or C 1-4 alkyl, and X is A or hydrogen. Five tetrakis and five tris specific compounds are named. The derivatives can be produced from an acetylene carbamide by reaction with a p-hydroxybenzyl alcohol, a dialkyldithiocarbamate, or formaldehyde and a phenol. The derivatives (1) are useful in an amount of 0.001 to 10% by weight as stabilizers against deterioration by light or oxygen of organic substances such as polymers, rubbers and petroleum products. They may be used together with a sulfur or phosphorus-containing antioxidant or a hindered amine light stabilizer.