Modified particles

Claim 2

Modified particles comprising inorganic particles as core particles, squaric acid which is formed as a coating film on the surfaces of said core particles, and at least one polysiloxane modified with at least one organic group selected from the group consisting of polyethers, polyesters and aralkyls, which is formed as a coating layer on the coating film of squaric acid.

Claim 3

Modified particles according to claim 1, wherein said inorganic particles are inorganic colored particles or magnetic particles.

Claim 4

Modified particles according to claim 1, wherein the amount of squaric acid coated on the surfaces of said core particles is 0.01 to 10% by weight, calculated as C, based on the core particles, and the weight ratio of the coating amount of the modified polysiloxane to that of squaric acid is 1: 1,000 to 1,000:1.

Claim 5

Modified particles according to claim 2, wherein said inorganic colored particles are particles of a pigment selected from the group consisting of white pigment, black pigment, yellow pigment, orange pigment, brown pigment, red pigment, violet pigment, blue pigment and green pigment.

Claim 6

Modified particles according to claim 2, wherein said magnetic particles are magnetoplumbite ferrite particles and magnetic iron oxide particles.

Claim 7

A pigment comprising the modified particles set forth in claim 4.

Claim 8

A water-based paint comprising a paint base material and the modified particles as the pigment set forth in claim 4 blended therein.

Claim 9

A water-based paint according to claim 7, wherein the amount of said pigment is 0.1 to 200 parts by weight based on 100 parts by weight of the paint base material.

Claim 10

Magnetic particles comprising the modified particles set forth in claim 5.

Claim 11

A magnetic water-based paint comprising a paint base material and the modified particles as the magnetic particles set forth in claim 5 blended therein.

Claim 12

A magnetic water-based paint according to claim 10, wherein the amount of said magnetic particles is 0.1 to 200 parts by weight based on 100 parts by weight of the paint base material.

Claim 13

A magnetic recording sheet comprising a non-magnetic support and a magnetic layer formed by applying the water-based paint set forth in claim 10 on at least a part of said support and at least one side of said support, the surface roughness of said magnetic layer being not more than 0.35 μm and the squareness of said magnetic layer being not less than 0.87.

Claim 14

A process for producing modified particles set forth in claim 1, which comprises adding squaric acid to an aqueous suspension containing the inorganic particles, followed by filtering and drying to coat the particle surfaces with squaric acid, and then mixing, at not less than 80° C., said squaric acid-coated inorganic particles and at least one polysiloxane modified with at least one selected from the group consisting of polyethers, polyesters and aralkyls to overlay said squaric acid-coated particle surfaces with said polysiloxane.

Claim 15

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and polyether-modified polysiloxanes represented by the formula (I): ##STR5## wherein R 1 represents .paren open-st.CH 2 .paren close-st. 1 .spsb.1 -- wherein 1 l is a number of 1 to 15; R 2 represents .paren open-st.CH 2 .paren close-st. m .spsb.1 --CH 3 wherein m 1 is a number of 0 to 15; R 3 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.1 --CH 3 wherein n 1 is a number of 0 to 15; R 4 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.1 --CH 3 wherein p 1 is a number of 0 to 15; q 1 is a number of 1 to 15; x 1 is a number of 1 to 50; and y 1 is a number of 1 to 300 which polysiloxane (I) is coated on the surfaces of said core particles.

Claim 16

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and polyether-modified polysiloxanes represented by the formula (I): ##STR5## wherein R 1 represents .paren open-st.CH 2 .paren close-st. 1 .spsb.1 -- wherein 1 l is a number of 1 to 15; R 2 represents .paren open-st.CH 2 .paren close-st. m .spsb.1 --CH 3 wherein m 1 is a number of 0 to 15; R 3 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.1 --CH 3 wherein n 1 is a number of 0 to 15; R 4 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.1 --CH 3 wherein p 1 is a number of 0 to 15; q 1 is a number of 1 to 15; x 1 is a number of 1 to 50; and y 1 is a number of 1 to 300 which polysiloxane (I) is coated on the surfaces of said core particles.

Claim 17

Modified particles according to claim 14, wherein the number-average molecular weight of the polyether-modified polysiloxanes are represented by the formula (I) is 350 to 500,000.

Claim 18

Modified particles according to claim 14, wherein said inorganic particles are inorganic colored particles or magnetic particles.

Claim 19

Modified particles according to claim 16, wherein said inorganic colored particles are particles of a pigment selected from the group consisting of white pigment, black pigment, yellow pigment, orange pigment, brown pigment, red pigment, violet pigment, blue pigment and green pigment.

Claim 20

Modified particles according to claim 17, wherein said inorganic colored particles are red iron oxide particles.

Claim 21

Modified particles according to claim 16, wherein said magnetic particles are magnetoplumbite ferrite particles and magnetic iron oxide particles.

Claim 22

Modified particles according to claim 14, wherein the amount of the modified polysiloxane coated on the surfaces of said core particles is 0.01 to 10% by weight, calculated as C, based on the core particles.

Claim 23

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and polyester-modified polysiloxanes represented by the following formula (II): ##STR6## wherein R 5 represents (CH 2 .paren close-st. l .spsb.2 -- wherein l 2 is a number of 1 to 15; R 6 and R 7 represent .paren open-st.CH 2 .paren close-st. m .spsb.2 -- or ##STR7## and maybe the same or different wherein m 2 is a number of 1 to 15; R 8 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.2 --CH 3 wherein n 2 is a number of 0 to 15; R 9 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.2 --CH 3 wherein p 2 is a number of 0 to 15; q 2 is a number of 1 to 15; x 2 is a number of 1 to 50; and y 2 is a number of 1 to 300 which polysiloxane (II) is coated on the surfaces of said core particles.

Claim 24

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and polyester-modified polysiloxanes represented by the following formula (II): ##STR6## wherein R 5 represents (CH 2 .paren close-st. l .spsb.2 -- wherein l 2 is a number of 1 to 15; R 6 and R 7 represent .paren open-st.CH 2 .paren close-st. m .spsb.2 -- or ##STR7## and maybe the same or different wherein m 2 is a number of 1 to 15; R 8 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.2 --CH 3 wherein n 2 is a number of 0 to 15; R 9 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.2 --CH 3 wherein p 2 is a number of 0 to 15; q 2 is a number of 1 to 15; x 2 is a number of 1 to 50; and y 2 is a number of 1 to 300 which polysiloxane (II) is coated on the surfaces of said core particles.

Claim 25

Modified particles according to claim 21, wherein the number-average molecular weight of the polyester-modified polysiloxanes represented by the formula (II) is 400 to 500,000.

Claim 26

Modified particles according to claim 21 wherein said inorganic particles are inorganic colored particles or magnetic particles.

Claim 27

Modified particles according to claim 23, wherein said inorganic colored particles are particles of a pigment selected from the group consisting of white pigment, black pigment, yellow pigment, orange pigment, brown pigment, red pigment, violet pigment, blue pigment and green pigment.

Claim 28

Modified particles according to claim 24, wherein said inorganic colored particles are red iron oxide particles.

Claim 29

Modified particles according to claim 23, wherein said magnetic particles are magnetoplumbite ferrite particles and magnetic iron oxide particles.

Claim 30

Modified particles according to claim 21, wherein the amount of the modified polysiloxane coated on the surfaces of said core particles is 0.01 to 10% by weight, calculated as C, based on the core particles.

Claim 31

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and aralkyl-modified polysiloxanes represented by the following formula (III): ##STR8## wherein R 10 represents .paren open-st.CH 2 .paren close-st. l .spsb.3 -- wherein l 3 is a number of 1 to 15; R 11 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.3 --CH 3 wherein n 3 is a number of 0 to 15; x 3 is a number of 1 to 500; and y 3 is a number of 1 to 500 which polysiloxane (III) is coated on the surfaces of said core particles.

Claim 32

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and aralkyl-modified polysiloxanes represented by the following formula (III): ##STR8## wherein R 10 represents .paren open-st.CH 2 .paren close-st. l .spsb.3 -- wherein l 3 is a number of 1 to 15; R 11 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.3 --CH 3 wherein n 3 is a number of 0 to 15; x 3 is a number of 1 to 500; and y 3 is a number of 1 to 500 which polysiloxane (III) is coated on the surfaces of said core particles.

Claim 33

Modified particles according to claim 28, wherein the number-average molecular weight of the aralkyl-modified polysiloxanes represented by the formula (III) is 350 to 500,000.

Claim 34

Modified particles according to claim 28, wherein said inorganic particles are inorganic colored particles or magnetic particles.

Claim 35

Modified particles according to claim 30, wherein said inorganic colored particles are particles of a pigment selected from the group consisting of white pigment, black pigment, yellow pigment, orange pigment, brown pigment, red pigment, violet pigment, blue pigment and green pigment.

Claim 36

Modified particles according to claim 31, wherein said inorganic colored particles are red iron oxide particles.

Claim 37

Modified particles according to claim 30, wherein said magnetic particles are magnetoplumbite ferrite particles and magnetic iron oxide particles.

Claim 38

Modified particles according to claim 28, wherein the amount of the modified polysiloxane coated on the surfaces of said core particles is 0.01 to 10% by weight, calculated as C, based on the core particles.

Claim 39

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and at least one selected from the group consisting of: polyether-modified polysiloxanes represented by the following formula (I): ##STR9## wherein R 1 represents .paren open-st.CH 2 .paren close-st. l .spsb.1 -- where l 1 is a number of 1 to 15; R 2 represents .paren open-st.CH 2 .paren close-st. m .spsb.3 --CH 3 wherein m 1 is a number of 0 to 15; R 3 represents H, OH, COOH, NCO, NH 2 , --CH↑CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.1 --CH 3 wherein n 1 is a number of 0 to 15; R 4 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.1 --CH 3 wherein p 1 is a number of 0 to 15; q 1 is a number of 1 to 15; x 1 is a number of 1 to 50; and y 1 is a number of 1 to 300; polyester-modified polysiloxanes represented by the following formula (II): ##STR10## wherein R 5 represents .paren open-st.CH 2 .paren close-st. l .spsb.2 -- wherein l 2 is a number of 1 to 15; R 6 and R7 represent .paren open-st.CH 2 .paren close-st. m .spsb.2 -- or ##STR11## and may be the same or different wherein m 2 is a number of 1 to 15; R 8 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.2 --CH 3 wherein n 2 is a number of 0 to 15; R 9 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.2 --CH 3 wherein p 2 is a number of 0 to 15; q 2 is a number of 1 to 15; x 2 is number of 1 to 50; and y 2 is a number of 1 to 300; and aralkyl-modified polysiloxanes represented by the following formula (III): ##STR12## wherein R 10 represents .paren open-st.CH 2 .paren close-st. l .spsb.3 -- wherein l 3 is a number of 1 to 15; R 11 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. m .spsb.3 --CH 3 wherein m 3 is a number of 0 to 15; R 12 represents H or .paren open-st.CH 2 .paren close-st. n .spsb.3 --CH 3 wherein n 3 is a number of 0 to 15; x 3 is a number of 1 to 500; and y 3 is a number of 1 to 500, which is coated on the surfaces of said core particles.

Claim 40

Modified particles consisting essentially of inorganic particles as core particles having a particle size of 0.01 to 20 μm, and at least one selected from the group consisting of: polyether-modified polysiloxanes represented by the following formula (I): ##STR9## wherein R 1 represents .paren open-st.CH 2 .paren close-st. l .spsb.1 -- where l 1 is a number of 1 to 15; R 2 represents .paren open-st.CH 2 .paren close-st. m .spsb.3 --CH 3 wherein m 1 is a number of 0 to 15; R 3 represents H, OH, COOH, NCO, NH 2 , --CH↑CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.1 --CH 3 wherein n 1 is a number of 0 to 15; R 4 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.1 --CH 3 wherein p 1 is a number of 0 to 15; q 1 is a number of 1 to 15; x 1 is a number of 1 to 50; and y 1 is a number of 1 to 300; polyester-modified polysiloxanes represented by the following formula (II): ##STR10## wherein R 5 represents .paren open-st.CH 2 .paren close-st. l .spsb.2 -- wherein l 2 is a number of 1 to 15; R 6 and R7 represent .paren open-st.CH 2 .paren close-st. m .spsb.2 -- or ##STR11## and may be the same or different wherein m 2 is a number of 1 to 15; R 8 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. n .spsb.2 --CH 3 wherein n 2 is a number of 0 to 15; R 9 represents H or .paren open-st.CH 2 .paren close-st. p .spsb.2 --CH 3 wherein p 2 is a number of 0 to 15; q 2 is a number of 1 to 15; x 2 is number of 1 to 50; and y 2 is a number of 1 to 300; and aralkyl-modified polysiloxanes represented by the following formula (III): ##STR12## wherein R 10 represents .paren open-st.CH 2 .paren close-st. l .spsb.3 -- wherein l 3 is a number of 1 to 15; R 11 represents H, OH, COOH, NCO, NH 2 , --CH═CH 2 , --C(CH 3 )═CH 2 or .paren open-st.CH 2 .paren close-st. m .spsb.3 --CH 3 wherein m 3 is a number of 0 to 15; R 12 represents H or .paren open-st.CH 2 .paren close-st. n .spsb.3 --CH 3 wherein n 3 is a number of 0 to 15; x 3 is a number of 1 to 500; and y 3 is a number of 1 to 500, which is coated on the surfaces of said core particles.

Claim 41

Modified particles according to claim 35, wherein the number-average molecular weight of the polyether modified polysiloxanes represented by the formula (I) is 350 to 500,000.

Claim 42

Modified particles according to claim 35, wherein the number-average molecular weight of the polyester modified polysiloxanes represented by the formula (II) is 400 to 500,000.

Claim 43

Modified particles according to claim 35, wherein the number-average molecular weight of the aralkyl-modified polysiloxanes represented by the formula (III) is 350 to 500,000.

Claim 44

A pigment comprising the modified particles set forth in claim 17, 26 or 31.

Claim 45

A water-based paint comprising a paint base material and the modified particles as the pigment set forth in claim 17, 24 or 31 blended therein.

Claim 46

A water-based paint according to claim 40, wherein the amount of said pigment is 0.1 to 200 parts by weight based on 100 parts by weight of the paint base material.

Claim 47

Magnetic particles comprising the modified particles set forth in claim 17, 26 or 33.

Claim 48

A magnetic water-based paint comprising a paint base material and the modified particles as the magnetic particles set forth in claim 19, 26 or 33 blended therein.

Claim 49

A magnetic water-based paint according to claim 43, wherein the amount of said magnetic particles is 0.1 to 200 parts by weight based on 100 parts by weight of the paint base material.

Claim 50

A magnetic recording sheet comprising a non-magnetic support and a magnetic layer formed by applying the water-based paint set forth in claim 43 on at least a part of said support and at least one side of said support, the surface roughness of said magnetic layer being not more than 0.35 μm and the squareness of said magnetic layer being not less than 0.87.

Claim 51

A process for producing modified particles set forth in claim 14, 21 or 28, which comprises mixing, at not less than 80° C., inorganic particles and at least one polysiloxane modified with at least one organic group selected from the group consisting of polyethers, polyesters and aralkyls to coat the surfaces of said particles with said modified polysiloxane.