Use of solids as antiblocking additives for marker liquids

Claim 2

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; dissolving a common dye in said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 500 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking additive used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common dye, and wherein said antiblocking additive forms a protective and anti-evaporating layer at said capillary outlet opening when said opening is unprotected and not in use; and adding said antiblocking additive in an amount of at least 1% by weight based on the final composition of said marking fluid.

Claim 3

Process of claim 1, wherein said antiblocking additive is at least one compound selected from the group consisting of an inorganic salt, an organic acid, an amino acid, an isocyclic, polycyclic or heterocyclic organic compound, a sugar or a sugar alcohol, urea or a common derivative thereof and a sulfur compound.

Claim 4

Process according to claim 1, wherein said antiblocking additive is dissolved in an ink or china ink including water as the solvent and wherein said antiblocking additive is at least one compound selected from the group consisting of diammonium hydrogen phosphate, citric acid, carbamic acid, a common carbamic acid derivative, a sugar alcohol, dimethylsulfon, benzoic acid or a common derivative thereof, urea or urea derivative of the general formula R--NHCO--HN--R, wherein one of the radicals R or both radicals R represent a hydrogen atom, a linear or branched alkyl radical with 1 to 8 C--atoms or an aromatic radical with 1 to 20 C--atoms, glycine, diglycine, phenylglycine, alanine, histidine, tyrosine, imidazole and an oligo peptide having up to 12 amino acids.

Claim 5

Process according to claim 1, wherein said antiblocking additive is dissolved in an ink or China ink including an alcohol, ether, ketone, or mixtures thereof in the solvent and wherein said antiblocking additive is at least one compound selected from the group consisting of phenanthrene or a common derivative thereof, benzoic acid or a common derivative thereof and an isocyclic, polycyclic or heterocyclic organic compound.

Claim 6

Process according to claim 1, wherein said antiblocking additive has the characteristic of increasing the open storage capacity of said marking fluid contained in the writing instrument having said capillary outlet opening by at least a factor of 2-4.

Claim 7

Process according to claim 1, wherein said antiblocking additive has a melting point of ≧ about 50° C.

Claim 8

Process of claim 1, wherein said antiblocking additive is used at 1 to 50% by weight of the final composition of the marking fluid.

Claim 9

The improved marking fluid prepared according to claim 1.

Claim 10

A writing instrument comprising marking fluid, a common capillary outlet opening for dispensing said marking fluid from said capillary opening and means for containing said marking fluid, wherein said marking fluid is prepared according to the process of claim 1.

Claim 11

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; adding a common pigment to said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 500 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking additive used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common pigment and wherein said antiblocking agent forms a protective and anti-evaporating layer at said capillary outlet opening when said opening is unprotected and not in use; and dissolving said antiblocking agent additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid, in said marking fluid; wherein said antiblocking additive is at least one selected from the group consisting of an inorganic salt, an organic acid, an amino acid, an isocyclic, polycyclic or heterocyclic organic compound, a sugar or a sugar alcohol and a sulfur compound.

Claim 12

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; adding a common pigment to said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 500 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking additive used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common pigment and wherein said antiblocking agent forms a protective and anti-evaporating layer at said capillary outlet opening when said opening is unprotected and not in use; and dissolving said antiblocking agent additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid, in said marking fluid; wherein said antiblocking additive is at least one selected from the group consisting of an inorganic salt, an organic acid, an amino acid, an isocyclic, polycyclic or heterocyclic organic compound, a sugar or a sugar alcohol and a sulfur compound.

Claim 13

Process according to claim 10, wherein said antiblocking additive has a melting point of ≧ about 50° C.

Claim 14

Process of claim 10, wherein said antiblocking additive is used at 1 to 50% by weight of the final composition of the marking fluid.

Claim 15

Process according to claim 10, wherein said antiblocking additive is at least one compound selected from the group consisting of phenanthrene or a common derivative thereof, benzoic acid or a common derivative thereof and an isocyclic, polycyclic or heterocyclic organic compound.

Claim 16

Process according to 18, wherein said antiblocking additive has the characteristic of increasing the open storage capacity of said marking fluid contained in the writing instrument having said capillary outlet opening by at least a factor of 2-4.

Claim 17

Process according to 18, wherein said antiblocking additive has the characteristic of increasing the open storage capacity of said marking fluid contained in the writing instrument having said capillary outlet opening by at least a factor of 2-4.

Claim 18

The improved marking fluid prepared according to claim 10.

Claim 19

A writing instrument comprising marking fluid, a common capillary outlet opening for dispensing said marking fluid from said capillary opening and means for containing said marking fluid, wherein said marking fluid is prepared according to the process of claim 10

Claim 20

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; dissolving a common dye in said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 1000 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking agent used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common dye, and wherein said antiblocking additive forms a protective and anti-evaporating layer at said capillary outlet opening when said opening is unprotected and not in use; and dissolving said antiblocking additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid; wherein said antiblocking additive is at least one selected from the group consisting of a diammonium hydrogen phosphate, citric acid, carbamic acid, or a common derivative thereof, a sugar alcohol, dimethyl sulfone, benzoic acid or a common derivative thereof, glycine, diglycine, phenylglycine, alanine, histidine, tyrosine, imidazole and an oligo peptide having up to 12 amino acids.

Claim 21

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; dissolving a common dye in said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 1000 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking agent used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common dye, and wherein said antiblocking additive forms a protective and anti-evaporating layer at said capillary outlet opening when said opening is unprotected and not in use; and dissolving said antiblocking additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid; wherein said antiblocking additive is at least one selected from the group consisting of a diammonium hydrogen phosphate, citric acid, carbamic acid, or a common derivative thereof, a sugar alcohol, dimethyl sulfone, benzoic acid or a common derivative thereof, glycine, diglycine, phenylglycine, alanine, histidine, tyrosine, imidazole and an oligo peptide having up to 12 amino acids.

Claim 22

The improved marking fluid prepared according to claim 17.

Claim 23

A writing instrument comprising marking fluid, a common capillary outlet opening for dispensing said marking fluid from said capillary opening and means for containing said marking fluid, wherein said marking fluid is prepared according to the process of claim 17.

Claim 24

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; dissolving a common dye in said solvent or solvent mixture and adding a common pigment to said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 500 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking agent used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common dye and said common pigment, and dissolving said antiblocking additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid, in said marking fluid.

Claim 25

A process for preparing an improved marking fluid for writing instruments which have a common capillary outlet opening to increase the open storage capacity of said writing instrument, wherein said marking fluid is dispensed through said capillary opening, said process of preparing said marking fluid comprising: preparing a common solvent or solvent mixture; dissolving a common dye in said solvent or solvent mixture and adding a common pigment to said solvent or solvent mixture; selecting an antiblocking additive comprising at least one solid wherein said antiblocking additive has a melting point greater than or equal to about 30° C. and a molecular weight equal to or less than about 500 Dalton, said selecting comprising the step of checking the ability of said antiblocking additive to exhibit crystallizing properties at said capillary opening, said crystallizing properties of said antiblocking additive at said capillary opening serving the purpose of defining the antiblocking agent used, wherein said crystallizing properties are characterized by the antiblocking additive crystallizing at said capillary outlet under the formation of growing crystals when placed in the solvent or solvent mixture alone, without the presence of said common dye and said common pigment, and dissolving said antiblocking additive in said common solvent or solvent mixture in an amount of at least 1% by weight based on the final composition of said marking fluid, in said marking fluid.

Claim 26

The improved marking fluid prepared according to claim 20.

Claim 27

A writing instrument comprising marking fluid, a common capillary outlet opening for dispensing said marking fluid from said capillary opening and means for containing said marking fluid, wherein said marking fluid is prepared according to the process of claim 20.