Modified photocatalyst sol

A modified photocatalyst composition comprising particles of a modified photocatalyst, and at least one functional compound selected from the group consisting of a monomer and a resin,

• said particles of a modified photocatalyst being prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):
• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• wherein said at least one functional compound has a surface energy larger than that of each modified photocatalyst particle by 2 dyne/cm or more so that said modified photocatalyst composition in the form of a film or a shaped article exhibits anisotropy with respect to the distribution of the modified photocatalyst particles.

Modified photocatalyst particles prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound selected from the group consisting of different compounds each of which independently comprises at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):

• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• said modifier compound having a sensitizing group.

Modified photocatalyst particles prepared by subjecting particles of a photocatalyst to a modification treatment, in the absence of a dehydrogenation-condensation catalyst, with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):

• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• said modifier compound having at least one group selected from the group consisting of:
• at least one reactive group selected from the group consisting of an acid anhydride group, a keto group, a hydrazine group, and a cyclic carbonate group, and at least one hydrophilic group selected from the group consisting of a carboxyl group and a salt thereof, a phosphate group and a salt thereof, a sulfonic acid group and a salt thereof, and a polyoxyalkylene group.

A modified photocatalyst sol comprising a liquid medium having dispersed therein particles of a modified photocatalyst,

• said particles of a modified photocatalyst being prepared by subjecting particles of a photocatalyst to a modification treatment with a modifier compound which is a silicon compound is represented by the following formula (5):
• (R1HSiO)a(R12SiO)b(R1QSiO)c(R13SiO1/2)d (5)
• wherein:
• each R1 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group and a halogen atom,
• Q represents a group having at least one function-imparting group selected from the group consisting of:
• 1) at least one hydrophobic group selected from the group consisting of a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group and a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom, and a C1–C30 fluoroalkyl group;
• 2) at least one hydrophilic group selected from the group consisting of a carboxyl group and a salt thereof, a phosphate group and a salt thereof, a sulfonic acid group and a salt thereof, and a polyoxyalkylene group;
• 3) at least one reactive group selected from the group consisting of an epoxy group, an acryloyl group, a methacryloyl group, an acid anhydride group, a keto group, a hydrazine group, an isocyanate group, an isothiocyanate group, a hydroxyl group, an amino group, a cyclic carbonate group and an ester group;
• and
• 4) at least one sensitizing group,
• a represents an integer of 1 or more,
• each of b and c independently represents an integer of 0 or more,
• d is 0 or 2,
• wherein a, b and c satisfy the following relationship:
• (a+b+c)≦10,000, and
• wherein when (a+b+c)≧2 and d is 0, the compound of formula (5) is a cyclic silicone compound, and when (a+b+c)≧1 and d is 2, the compound of formula (5) is a straight chain silicone compound,
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less.

Modified photocatalyst particles which are prepared by subjecting particles of a photocatalyst to a modification treatment with a modifier compound which is a silicon compound is represented by the following formula (5):

• (R1HSiO)a(R12SiO)b(R1QSiO)c(R13SiO1/2)d (5)
• wherein:
• each R1 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group and a halogen atom,
• Q represents a group having at least one function-imparting group selected from the group consisting of:
• 1) at least one hydrophobic group selected from the group consisting of a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group and a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom, and a C1–C30 fluoroalkyl group;
• 2) at least one hydrophilic group selected from the group consisting of a carboxyl group and a salt thereof, a phosphate group and a salt thereof, a sulfonic acid group and a salt thereof, and a polyoxyalkylene group;
• 3) at least one reactive group selected from the group consisting of an epoxy group, an acryloyl group, a methacryloyl group, an acid anhydride group, a keto group, a hydrazine group, an isocyanate group, an isothiocyanate group, a hydroxyl group, an amino group, a cyclic carbonate group and an ester group;
• and
• 4) at least one sensitizing group,
• a represents an integer of 1 or more,
• each of b and c independently represents an integer of 0 or more,
• d is 0 or 2,
• wherein a, b and c satisfy the following relationship:
• (a+b+c)≦10,000, and
• wherein when (a+b+c)≧2 and d is 0, the compound of formula (5) is a cyclic silicone compound, and when (a+b+c)≧1 and d is 2, the compound of formula (5) is a straight chain silicone compound,
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less.

Modified photocatalyst particles which are prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):

• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• wherein said modifier compound contains at least one silicon atom having bonded thereto at least one hydrogen atom,
• wherein said modification treatment is conducted in the presence of a dehydrogenation-condensation catalyst which has dehydrogenation-condensation activity with respect to said hydrogen atom bonded to the silicon atom of the modifier compound,
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less.

Modified photocatalyst particles which are prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):

• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• said at least one modifier compound having a sensitizing group,
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less.

A modified photocatalyst composition comprising:

• a modified photocatalyst sol comprising a liquid medium having dispersed therein particles of a modified photocatalyst,
• said particles of a modified photocatalyst being prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):
• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less;
• and
• at least one functional substance selected from the group consisting of a monomer and a resin.

A modified photocatalyst composition comprising:

• particles of a modified photocatalyst which is prepared by subjecting particles of a photocatalyst to a modification treatment with at least one modifier compound comprising at least one structural unit selected from the group consisting of a monooxydiorganosilane unit represented by formula (1), a dioxyorganosilane unit represented by formula (2), and a difluoromethylene unit represented by formula (3):
• —(R1R2SiO)— (1)
• wherein each of R1 and R2 independently represents a hydrogen atom, a straight chain or branched C1–C30 alkyl group, a C5–C20 cycloalkyl group or a C6–C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1–C20 alkyl group, a C1–C20 alkoxy group and a halogen atom,
• wherein R1 is as defined for formula (1), and
• —(CF2)— (3),
• said modified photocatalyst particles having a volume mean particle diameter of 800 nm or less;
• and
• at least one substance selected from the group consisting of a monomer and a resin.