Provided are a lens for spectacles containing a resin having a refractive index of 1.65 or more and an ultraviolet absorbing agent A having, in a case where an absorbance at a maximum absorption wavelength is 1.0, an absorbance ratio at 410 nm of 0.10 or less and an absorbance ratio at 400 nm of 0.1 or more, where a proportion of the absorbance ratio at 400 nm to the absorbance ratio at 410 nm is 5.0 or more, and spectacles.

Provided are a lens for spectacles containing a resin having a refractive index of 1.65 or more and an ultraviolet absorbing agent A having, in a case where an absorbance at a maximum absorption wavelength is 1.0, an absorbance ratio at 410 nm of 0.10 or less and an absorbance ratio at 400 nm of 0.1 or more, where a proportion of the absorbance ratio at 400 nm to the absorbance ratio at 410 nm is 5.0 or more, and spectacles.

A polymer composition of cross-linked fluoropolymers is provided, that is generated using a fluoropolymer compatibilizer. The cross-linked fluoropolymers have excellent mechanical and dielectric characteristics at high temperatures, making them useful for such applications as insulation for automotive communications cables and PCB laminates.

A rubber composition for downhole tools having excellent degradability and storability is provided. The rubber composition for downhole tools includes degradable rubber, a degradation accelerator, and a degradation inhibitor. The degradation accelerator is at least one type of the compound represented by Formula (I) or Formula (II) below. The degradation inhibitor is at least one type selected from the group consisting of carbodiimide compounds, oxazoline compounds, oxazine compounds, and epoxy compounds. The content of the degradation accelerator is from 0.1 to 20 parts by mass relative to 100 parts by mass of the degradable rubber. The content of the degradation inhibitor is from 0.1 to 3 parts by mass relative to 100 parts by mass of the degradable rubber.

Provided are a lens for spectacles containing a resin and a coloring agent having a maximum absorption wavelength in a methanol solution in a range of 400 nm to 500 nm and a half-width of an absorption peak in a methanol solution of 10 nm or more and less than 40 nm, and spectacles.

The present application provides a re-releasable aqueous pressure-sensitive adhesive composition containing: as a main component, an emulsion [A] of a (meth)acrylic acid-based ester copolymer, an emulsion [B] of a (meth)acrylic acid-based ester copolymer, and a crosslinker [C]. The emulsion [A] contains a constituent unit that has a carboxy group or a hydroxy group and reacts with a crosslinker. The emulsion [B] is included in the composition in an amount of 0.6 parts by mass or more in terms of a solid content based on 100 parts by mass of a solid content of the emulsion [A] and functions as a crosslinking assistant. The emulsion [B] has a peculiar structure dissolving in water upon neutralization and is unmeasurable in a particle diameter distribution analysis at pH from 6.5 to 7.5. The crosslinker [C] is a hydrazide-based compound that is soluble or dispersible in water.

The present application provides a re-releasable aqueous pressure-sensitive adhesive composition containing: as a main component, an emulsion [A] of a (meth)acrylic acid-based ester copolymer, an emulsion [B] of a (meth)acrylic acid-based ester copolymer, and a crosslinker [C]. The emulsion [A] contains a constituent unit that has a carboxy group or a hydroxy group and reacts with a crosslinker. The emulsion [B] is included in the composition in an amount of 0.6 parts by mass or more in terms of a solid content based on 100 parts by mass of a solid content of the emulsion [A] and functions as a crosslinking assistant. The emulsion [B] has a peculiar structure dissolving in water upon neutralization and is unmeasurable in a particle diameter distribution analysis at pH from 6.5 to 7.5. The crosslinker [C] is a hydrazide-based compound that is soluble or dispersible in water.

The present application provides a re-releasable aqueous pressure-sensitive adhesive composition containing: as a main component, an emulsion [A] of a (meth)acrylic acid-based ester copolymer, an emulsion [B] of a (meth)acrylic acid-based ester copolymer, and a crosslinker [C]. The emulsion [A] contains a constituent unit that has a carboxy group or a hydroxy group and reacts with a crosslinker. The emulsion [B] is included in the composition in an amount of 0.6 parts by mass or more in terms of a solid content based on 100 parts by mass of a solid content of the emulsion [A] and functions as a crosslinking assistant. The emulsion [B] has a peculiar structure dissolving in water upon neutralization and is unmeasurable in a particle diameter distribution analysis at pH from 6.5 to 7.5. The crosslinker [C] is a hydrazide-based compound that is soluble or dispersible in water.

The present invention provides a novel metal alkoxide having excellent hydrolysis resistance, and a crosslinking agent composition for aqueous resin and an aqueous resin composition each using the same. A metal alkoxide represented by the following formula (1-1), (1-2), or (1-3) and having a mass average molecular weight of 800 to 8,500 is used:

Ti(OA).sub.4 (1-1)

Zr(OA).sub.4 (1-2)

Al(OA).sub.3 (1-3) wherein A's are each independently a residue resulting from removal of a hydroxy group from a polyalkylene glycol monohydrocarbyl ether represented by the following general formula (1a):

R.sup.11(OCHR.sup.12CH.sub.2).sub.nOH (1a) wherein R.sup.11 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; R.sup.12 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and n is an integer of 4 to 45.

The present invention provides a novel metal alkoxide having excellent hydrolysis resistance, and a crosslinking agent composition for aqueous resin and an aqueous resin composition each using the same. A metal alkoxide represented by the following formula (1-1), (1-2), or (1-3) and having a mass average molecular weight of 800 to 8,500 is used:

Ti(OA).sub.4 (1-1)

Zr(OA).sub.4 (1-2)

Al(OA).sub.3 (1-3) wherein A's are each independently a residue resulting from removal of a hydroxy group from a polyalkylene glycol monohydrocarbyl ether represented by the following general formula (1a):

R.sup.11(OCHR.sup.12CH.sub.2).sub.nOH (1a) wherein R.sup.11 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; R.sup.12 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and n is an integer of 4 to 45.