Provided is an alkyldiphenylmethane protective agent, which can prevent solidification or insolubilization of a compound by protecting a functional group of the compound to achieve easy separation and purification after a reaction. An alkyldiphenylmethane compound represented by general formula (1): ##STR00001## wherein Y represents OR.sup.19 (wherein R.sup.19 represents a hydrogen atom or an active ester-type protecting group), NHR.sup.20 (wherein R.sup.20 represents a hydrogen atom, a C.sub.1-6 linear or branched alkyl group, or an aralkyl group), isocyanate group, an azide group, or a halogen atom, Z represents a C.sub.1-4 linear or branched alkyl group, an alkenyl group, or a cycloalkyl group, at least one of R.sup.1 to R.sup.10 represents a group represented by formula (2): ##STR00002## and the others each independently represent a hydrogen atom, a halogen atom, a alkyl group, or a C.sub.1-4 alkoxy group; R.sup.11 represents a C.sub.1-16 linear or branched alkylene group; X represents O or CONR.sup.21 (wherein R.sup.21 represents a hydrogen atom or a C.sub.1-4 alkyl group); and A represents, for example, a group represented by formula (3): ##STR00003## wherein R.sup.12, R.sup.13, and R.sup.14 may be the same or different and each independently represent a C.sub.1-6 linear or branched alkyl group or an optionally substituted aryl group; R.sup.15 represents a single bond or a C.sub.1-3 linear or branched alkylene group; and R.sup.16, R.sup.17, and R.sup.18 each independently represent a C.sub.1-3 linear or branched alkylene group.

Provided is an alkyldiphenylmethane protective agent, which can prevent solidification or insolubilization of a compound by protecting a functional group of the compound to achieve easy separation and purification after a reaction. An alkyldiphenylmethane compound represented by general formula (1): ##STR00001## wherein Y represents OR.sup.19 (wherein R.sup.19 represents a hydrogen atom or an active ester-type protecting group), NHR.sup.20 (wherein R.sup.20 represents a hydrogen atom, a C.sub.1-6 linear or branched alkyl group, or an aralkyl group), isocyanate group, an azide group, or a halogen atom, Z represents a C.sub.1-4 linear or branched alkyl group, an alkenyl group, or a cycloalkyl group, at least one of R.sup.1 to R.sup.10 represents a group represented by formula (2): ##STR00002## and the others each independently represent a hydrogen atom, a halogen atom, a alkyl group, or a C.sub.1-4 alkoxy group; R.sup.11 represents a C.sub.1-16 linear or branched alkylene group; X represents O or CONR.sup.21 (wherein R.sup.21 represents a hydrogen atom or a C.sub.1-4 alkyl group); and A represents, for example, a group represented by formula (3): ##STR00003## wherein R.sup.12, R.sup.13, and R.sup.14 may be the same or different and each independently represent a C.sub.1-6 linear or branched alkyl group or an optionally substituted aryl group; R.sup.15 represents a single bond or a C.sub.1-3 linear or branched alkylene group; and R.sup.16, R.sup.17, and R.sup.18 each independently represent a C.sub.1-3 linear or branched alkylene group.

Provided is an alkyldiphenylmethane protective agent, which can prevent solidification or insolubilization of a compound by protecting a functional group of the compound to achieve easy separation and purification after a reaction.

An alkyldiphenylmethane compound represented by general formula (1):

##STR00001##

wherein Y represents OR.sup.19 (wherein R.sup.19 represents a hydrogen atom or an active ester-type protecting group), NHR.sup.20 (wherein R.sup.20 represents a hydrogen atom, a C.sub.1-6 linear or branched alkyl group, or an aralkyl group), isocyanate group, an azide group, or a halogen atom, Z represents a C.sub.1-4 linear or branched alkyl group, an alkenyl group, or a cycloalkyl group, at least one of R.sup.1 to R.sup.10 represents a group represented by formula (2):

OR.sup.11X-A(2)

and the others each independently represent a hydrogen atom, a halogen atom, a alkyl group, or a C.sub.1-4 alkoxy group; R.sup.11 represents a C.sub.1-16 linear or branched alkylene group; X represents O or CONR.sup.21 (wherein R.sup.21 represents a hydrogen atom or a C.sub.1-4 alkyl group); and A represents, for example, a group represented by formula (3):

##STR00002##

wherein R.sup.12, R.sup.13, and R.sup.14 may be the same or different and each independently represent a C.sub.1-6 linear or branched alkyl group or an optionally substituted aryl group; R.sup.15 represents a single bond or a C.sub.1-3 linear or branched alkylene group; and R.sup.16, R.sup.17, and R.sup.18 each independently represent a C.sub.1-3 linear or branched alkylene group.

Provided is an alkyldiphenylmethane protective agent, which can prevent solidification or insolubilization of a compound by protecting a functional group of the compound to achieve easy separation and purification after a reaction.

An alkyldiphenylmethane compound represented by general formula (1):

##STR00001##

wherein Y represents OR.sup.19 (wherein R.sup.19 represents a hydrogen atom or an active ester-type protecting group), NHR.sup.20 (wherein R.sup.20 represents a hydrogen atom, a C.sub.1-6 linear or branched alkyl group, or an aralkyl group), isocyanate group, an azide group, or a halogen atom, Z represents a C.sub.1-4 linear or branched alkyl group, an alkenyl group, or a cycloalkyl group, at least one of R.sup.1 to R.sup.10 represents a group represented by formula (2):

OR.sup.11X-A(2)

and the others each independently represent a hydrogen atom, a halogen atom, a alkyl group, or a C.sub.1-4 alkoxy group; R.sup.11 represents a C.sub.1-16 linear or branched alkylene group; X represents O or CONR.sup.21 (wherein R.sup.21 represents a hydrogen atom or a C.sub.1-4 alkyl group); and A represents, for example, a group represented by formula (3):

##STR00002##

wherein R.sup.12, R.sup.13, and R.sup.14 may be the same or different and each independently represent a C.sub.1-6 linear or branched alkyl group or an optionally substituted aryl group; R.sup.15 represents a single bond or a C.sub.1-3 linear or branched alkylene group; and R.sup.16, R.sup.17, and R.sup.18 each independently represent a C.sub.1-3 linear or branched alkylene group.

The xylylene diisocyanate composition according to the embodiments has a chlorine content of 100 to 1,000 ppm to improve the stability, so that the degradation of the reactivity can be prevented even when it is stored for a long period of time. Therefore, even if the xylylene diisocyanate composition according to the embodiments is used after it has been stored for a long period of time for sale or the like, the xylylene diisocyanate composition can be polymerized with a thiol to produce a polythiourethane-based optical material having excellent properties such as refractive index, Abbe number, transparency, glass transition temperature, yellowness index, and the like. Therefore, it can be advantageously used in the field of eyeglass lenses, camera lenses, and the like.

The xylylene diisocyanate composition according to the embodiments has a chlorine content of 100 to 1,000 ppm to improve the stability, so that the degradation of the reactivity can be prevented even when it is stored for a long period of time. Therefore, even if the xylylene diisocyanate composition according to the embodiments is used after it has been stored for a long period of time for sale or the like, the xylylene diisocyanate composition can be polymerized with a thiol to produce a polythiourethane-based optical material having excellent properties such as refractive index, Abbe number, transparency, glass transition temperature, yellowness index, and the like. Therefore, it can be advantageously used in the field of eyeglass lenses, camera lenses, and the like.

The xylylene diisocyanate composition according to the embodiments has a chlorine content of 100 to 1,000 ppm to improve the stability, so that the degradation of the reactivity can be prevented even when it is stored for a long period of time. Therefore, even if the xylylene diisocyanate composition according to the embodiments is used after it has been stored for a long period of time for sale or the like, the xylylene diisocyanate composition can be polymerized with a thiol to produce a polythiourethane-based optical material having excellent properties such as refractive index, Abbe number, transparency, glass transition temperature, yellowness index, and the like. Therefore, it can be advantageously used in the field of eyeglass lenses, camera lenses, and the like.

The present invention relates to a method for preparing an aliphatic isocyanate capable of suppressing the occurrence of side reactions and the production of by-products. The method for preparing an aliphatic isocyanate comprises a step of reacting a salt of an aliphatic amine with phosgene, wherein the reaction step comprises a first reaction step in which phosgene is primarily added and reacted with the salt of an aliphatic amine salt at a temperature of 80 to 100 C., and a second reaction step in which phosgene is secondarily added and reacted with the resultant product of the first reaction step at a temperature of 120 to 160 C., and wherein the amount of the primarily added phosgene is a certain ratio of the total amount of the phosgene.

A xylylene diisocynate composition, a preparation method therefor and the use thereof. The xylylene diisocynate composition includes xylylene diisocynate and 0.2-500 ppm of a compound represented by formula (1). A resin prepared from the provided xylylene diisocynate composition has an excellent discoloration resistance and can effectively inhibit yellowing and/or white turbidity thereof.

A xylylene diisocynate composition, a preparation method therefor and the use thereof. The xylylene diisocynate composition includes xylylene diisocynate and 0.2-500 ppm of a compound represented by formula (1). A resin prepared from the provided xylylene diisocynate composition has an excellent discoloration resistance and can effectively inhibit yellowing and/or white turbidity thereof.