Recording medium and recording method by use thereof

Claim 2

A recording medium comprising a substrate and an ink receiving layer provided on said substrate, wherein the ink receiving layer contains spherical silica and a silicon-containing water-soluble polymer.

Claim 3

A recording medium according to claim 1, wherein the secondary particle size of the spherical silica has an average diameter in the range of from 0.5 to 150 μm.

Claim 4

A recording medium according to claim 1, wherein the ratio of the shortest diameter to the longest diameter of the spherical silica is 0.6 or more.

Claim 5

A recording medium according to claim 1, wherein the secondary particles of the spherical silica has a fine pore size of 30 to 400 Å.

Claim 6

A recording medium according to claim 1, wherein the ink receiving layer contains a polymeric emulsion.

Claim 7

A recording medium according to claim 1, wherein the silicon-containing water-soluble polymer is a silicon-containing modified polyvinyl alcohol.

Claim 8

A recording medium according to claim 6, wherein the silicon-containing modified polyvinyl alcohol is a copolymerization product of a vinyl ester and a monomer selected from the group consisting of CH.sub.2 =CH(CH.sub.2).sub.n Si(R'.sub.m)(R.sup.2).sub.3-m wherein n is 0 or 1, m is 0 to 2, R' is lower alkyl, allyl or lower alkyl with an allyl group and R 2 is saturated C 1-40 branched or non-branched alkoxyl which may have an oxygen-containing substituent; CH.sub.2 =C(R.sup.3)CON(R.sup.4)R.sup.5 Si(R.sub.n.sup.6)(R.sup.7).sub.3-n wherein R 3 is H or methyl, R 4 is H or lower alkyl, R 5 is alkylene or a divalent organic residue having a carbon chaim mutually bonded with oxygen or nitrogen, R 6 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 7 is alkoxyl or acyloxyl, both of which may have an oxygen or nitrogen-containing substituent and n is 0 to 2; and CH.sub.2 =C(R.sup.8)Si(R.sub.n.sup.9)(OC(O)R.sup.10).sub.3-n wherein R 8 is H or methyl, R 9 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 10 is lower alkyl and n is 0 to 2.

Claim 9

A recording medium comprising a substrate and an ink receiving layer provided on said substrate, wherein spherical silica having an average diameter of 3.2 to 10 μm are coated onto the substrate with a silicon-containing water-soluble polymer at a ratio of 100 parts silica to 3-100 parts polymer.

Claim 10

A recording medium comprising a substrate and an ink receiving layer provided on said substrate, wherein spherical silica having an average diameter of 3.2 to 10 μm are coated onto the substrate with a silicon-containing water-soluble polymer at a ratio of 100 parts silica to 3-100 parts polymer.

Claim 11

A recording medium according to claim 8, wherein the secondary particles of the spherical silica have an average fine pore size in the range of from 30 to 400 Å.

Claim 12

A recording medium according to claim 8, wherein the ratio of the shortest diameter to the longest diameter of the spherical silica is 0.6 or more.

Claim 13

A recording medium according to claim 8, wherein the silicon-containing water-soluble polymer is a silicon-containing modified polyvinyl alcohol.

Claim 14

A recording medium according to claim 11, wherein the silicon-containing modified polyvinyl alcohol is a copolymerization product of a vinyl ester and a monomer selected from the group consisting of CH.sub.2 =CH(CH.sub.2).sub.n Si(R'.sub.m)(R.sup.2).sub.3-m wherein n is 0 or 1, m is 0 to 2, R' is lower alkyl, allyl or lower alkyl with an allyl group and R 2 is saturated C 1-40 branched or non-branched alkoxyl which may have an oxygen-containing substituent; CH.sub.2 =C(R.sup.3)CON(R.sup.4)R.sup.5 Si(R.sub.n.sup.6)(R.sup.7).sub.3-n wherein R 3 is H or methyl, R 4 is H or lower alkyl, R 5 is alkylene or a divalent organic residue having a carbon chain mutually bonded with oxygen or nitrogen, R 6 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 7 is alkoxyl or acyloxyl, both of which may have an oxygen or nitrogen-containing substituent and n is 0 to 2; and CH.sub.2 =C(R.sup.8)Si(R.sub.n.sup.9)(OC(O)R.sup.10).sub.3-n wherein R 8 is H or methyl, R 9 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 10 is lower alkyl and n is 0 to 2.

Claim 15

A recording medium comprising a substrate and an ink receiving layer provided on said substrate wherein spherical silica having an average diameter of 3.2 to 10 μm are coated onto the substrate with a silicon-containing water-soluble polymer at a ratio of 100 parts silica to 3-100 parts polymer, and wherein the particle proportion within the particle size range of average diameter ±1.5 μm is 60% or more.

Claim 16

A recording medium comprising a substrate and an ink receiving layer provided on said substrate wherein spherical silica having an average diameter of 3.2 to 10 μm are coated onto the substrate with a silicon-containing water-soluble polymer at a ratio of 100 parts silica to 3-100 parts polymer, and wherein the particle proportion within the particle size range of average diameter ±1.5 μm is 60% or more.

Claim 17

A recording medium according to claim 13, wherein said particle proportion is 80% or more.

Claim 18

A recording medium according to claim 13, wherein the ratio of the shortest diameter to the longest diameter of the spherical silica is 0.6 or more.

Claim 19

A recording medium according to claim 13, wherein the secondary particles of the spherical silica have a fine pore size of 30 to 400 A.

Claim 20

A recording medium according to claim 13, wherein the silicon-containing water-soluble polymer is a silicon-containing modified polyvinyl alcohol.

Claim 21

A recording medium according to Claim 17, wherein the silicon-containing modified polyvinyl alcohol is a copolymerization product of a vinyl ester and a monomer selected from the group consisting of CH.sub.2 =CH(CH.sub.2).sub.n Si(R'.sub.m)(R.sup.2).sub.3-m wherein n is 0 or 1, m is 0 to 2, R' is lower alkyl, allyl or lower alkyl with an allyl group and R 2 is saturated C 1-40 branched or non-branched alkoxyl which may have an oxygen-containing substituent; CH.sub.2 =C(R.sup.3)CON(R.sup.4)R.sup.5 Si(R.sub.n.sup.6)(R.sup.7).sub.3-n wherein R 3 is H or methyl, R 4 is H or lower alkyl, R 5 is alkylene or a divalent organic residue having a carbon chain mutually bonded with oxygen or nitrogen, R 6 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 7 is alkoxyl or acyloxyl, both of which have an oxygen or nitrogen-containing substituent and n is 0 to 2; and CH.sub.2 =C(R.sup.8)Si(R.sub.n.sup.9)(OC(O)R.sup.10).sub.3-n wherein R 8 is H or methyl, R 9 is H, halogen, lower alkyl, allyl or lower alkyl with an allyl group, R 10 is lower alkyl and n is 0 to 2.