US4549824A — Ink additives for efficient thermal ink transfer …

Claim 1

Independent Claim 58 words

In thermal transfer printing an ink bearing ribbon comprising a support layer and at least one other layer, said one other layer including a fusible ink which is solid and stable at room temperature and which comprises an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing.

Claim 2

Dependent Claim 58 words

In thermal transfer printing an ink bearing ribbon comprising a support layer and at least one other layer, said one other layer including a fusible ink which is solid and stable at room temperature and which comprises an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing.

Claim 3

Dependent Claim 70 words

In a thermal transfer printing process wherein energy is applied to an ink-bearing ribbon to melt and transfer ink from said ink-bearing ribbon to a receiving medium for printing thereon, the improvement wherein some of the heat required for said printing is provided by an exothermic chemical reaction of an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing.

Claim 4

Dependent Claim 70 words

In a thermal transfer printing process wherein energy is applied to an ink-bearing ribbon to melt and transfer ink from said ink-bearing ribbon to a receiving medium for printing thereon, the improvement wherein some of the heat required for said printing is provided by an exothermic chemical reaction of an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing.

Claim 5

Dependent Claim 16 words

A ribbon as claimed in claim 1, where the fusible ink further comprises an organic solvent.

Claim 6

Dependent Claim 17 words

A ribbon as claimed in claim 1, where the fusible ink further comprises water as a solvent.

Claim 7

Dependent Claim 19 words

A ribbon as claimed in claim 1, where the fusible ink further comprises a polymer binder and a colorant.

Claim 8

Dependent Claim 19 words

A ribbon as claimed in claim 5, wherein said binder is a polyamide and said colorant is carbon black.

Claim 9

Dependent Claim 24 words

A ribbon as claimed in claim 1, wherein said aromatic azido compound contains the moiety --Ar--N 3 , wherein --Ar-- is an aromatic group.

Claim 10

Dependent Claim 45 words

A ribbon as claimed in claim 5, wherein said aromatic azido compound is selected from the group consisting of 4,4'-bis azido-diphenylsulfone, ##STR6## where R is a hydrocarbon radical having 1 to 6 carbon atoms, ##STR7## 2-azido benzoic acid, 3-azido benzoic acid, 4-azido benzoic acid, ##STR8##

Claim 11

Dependent Claim 11 words

A ribbon as claimed in claim 7, wherein Ar is phenyl.

Claim 12

Dependent Claim 16 words

A ribbon as claimed in claim 4, wherein said aromatic azido compound comprises a water-solubilizing moiety.

Claim 13

Dependent Claim 32 words

A ribbon as claimed in claim 10, wherein said water-solubilizing moiety is selected from the group consisting of --COOH, --SO 3 H, phenolic OH and --SO 2 CH 2 SO 2 --.

Claim 14

Dependent Claim 39 words

A ribbon as claimed in claim 1, wherein the fusible incorporation of the fusible aromatic azido compound into the ink causes the ink to show an exotherm in the temperature range of from about 170° C. to 200° C.

Claim 15

Dependent Claim 34 words

A ribbon as claimed in claim 1, wherein the fusible ink comprises a binder and from about 1 to about 20 wt% of the fusible ink, based on solids, of the aromatic azido compound.

Claim 16

Dependent Claim 40 words

A ribbon as claimed in claim 1, wherein the fusible ink comprises from about 5 to about 20 wt% pigment and from about 1 to about 20 wt% of the fusible ink, based on solids, of the aromatic azido compound.

Claim 17

Dependent Claim 23 words

A ribbon as claimed in claim 1, wherein the fusible ink is in the form of a layer 4-7 micrometers in dry thickness.

Claim 18

Dependent Claim 42 words

A ribbon as claimed in claim 7, wherein said --Ar--N 3 moiety is linked to another --Ar--N 3 moiety via a C═O group, via an SO 2 group, via an unsaturated hydrocarbon group which may be substituted, via oxygen or via sulfur.

Claim 19

Dependent Claim 21 words

A ribbon as claimed in claim 1, where the fusible ink is in the form of a layer on a support.

Claim 20

Dependent Claim 16 words

A process as claimed in claim 2, wherein said fusible ink further comprises an organic solvent.

Claim 21

Dependent Claim 17 words

A process as claimed in claim 2, wherein said fusible ink further comprises water as a solvent.

Claim 22

Dependent Claim 19 words

A process as claimed in claim 2, wherein said fusible ink further comprises a polymer binder and a colorant.

Claim 23

Dependent Claim 19 words

A process as claimed in claim 20, wherein said binder is a polyamide and said colorant is carbon black.

Claim 24

Dependent Claim 24 words

A process as claimed in claim 2, wherein said aromatic azido compound contains the moiety --AR--N 3 , wherein --AR-- is an aromatic group.

Claim 25

Dependent Claim 45 words

A process as claimed in claim 20, wherein said aromatic azido compound is selected from the group consisting of 4,4'-bis azido-diphenylsulfone, ##STR9## where R is a hydrocarbon radical having 1 to 6 carbon atoms, ##STR10## 2-azido benzoic acid, 3-azido benzoic acid, 4-azido benzoic acid, ##STR11##

Claim 26

Dependent Claim 11 words

A process as claimed in claim 22, wherein Ar is phenyl.

Claim 27

Dependent Claim 16 words

A process as claimed in claim 19, wherein said aromatic azido compound comprises a water-solubilizing moiety.

Claim 28

Dependent Claim 32 words

A process as claimed in claim 25, wherein said water-solubilizing moiety is selected from the group consisting of --COOH, --SO 3 H, phenolic OH and --SO 2 CH 2 SO 2 .

Claim 29

Dependent Claim 39 words

A process as claimed in claim 2, wherein the incorporation of the aromatic azido compound into the fusible ink causes the fusible ink to show an exotherm in the temperature range of from about 170° C. to 200° C.

Claim 30

Dependent Claim 34 words

A process as claimed in claim 2, wherein the fusible ink comprises a binder and from about 1 to about 20 wt% of the fusible ink, based on solids, of the aromatic azido compound.

Claim 31

Dependent Claim 43 words

A process as claimed in claim 2, wherein the fusible ink comprises from about 5 to about 20 wt% pigment and a binder and from about 1 to about 20 wt% of the fusible ink, based on solids, of the aromatic azido compound.

Claim 32

Dependent Claim 23 words

A process as claimed in claim 2, wherein the fusible ink is in the form of a layer 4-7 micrometers in dry thickness.

Claim 33

Dependent Claim 42 words

A process as claimed in claim 22, wherein said --Ar--N 3 moiety is linked to another --Ar--N 3 moiety via a C═O group, via an SO 2 group, via an unsaturated hydrocarbon group which may be substituted, via oxygen or via sulfur.

Claim 34

Dependent Claim 20 words

A process as claimed in claim 30, wherein the initial member comprises the layer of fusible ink and a support.

Claim 35

Dependent Claim 27 words

A process as claimed in claim 30, wherein the ink bearing ribbon comprises the layer of fusible ink, a support, a conductive layer and a resistive layer.

Claim 36

Dependent Claim 22 words

A process as claimed in claim 30, wherein the fusible ink is transferred by application of heat from a thermal print head.

Claim 37

Dependent Claim 30 words

A process as claimed in claim 30, wherein the ink-bearing ribbon further comprises a resistive layer and the fusible ink is transferred by resistive heat generated by said resistive layer.

Claim 38

Dependent Claim 84 words

In a thermal transfer printing process wherein energy is applied to an ink-bearing ribbon to melt and transfer fusible ink from said ink-bearing ribbon to a receiving medium for printing thereon, the improvement wherein some of the heat required for said printing is provided by an exothermic chemical reaction of an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing process, said ink and said aromatic azido compound being present as separate layers.

Claim 39

Dependent Claim 84 words

In a thermal transfer printing process wherein energy is applied to an ink-bearing ribbon to melt and transfer fusible ink from said ink-bearing ribbon to a receiving medium for printing thereon, the improvement wherein some of the heat required for said printing is provided by an exothermic chemical reaction of an aromatic azido compound which is stable at room temperature but which exotherms at the conditions of the thermal transfer printing process, said ink and said aromatic azido compound being present as separate layers.

Claim 40

Dependent Claim 15 words

A process as claimed in claim 36, wherein the fusible ink comprises an organic solvent.

Claim 41

Dependent Claim 17 words

A process as claimed in claim 36, wherein the fusible ink comprises a water as a solvent.

Claim 42

Dependent Claim 17 words

A process as claimed in claim 36, wherein said fusible ink comprises a binder and a colorant.

Claim 43

Dependent Claim 20 words

A process as claimed in claim 20, wherein said binder is a polyamide and said colorant is carbon black. CM

Claim 44

Dependent Claim 24 words

A process as claimed in claim 36, wherein said aromatic azido compound contains the moiety --Ar--N 3 , wherein --Ar-- is an aromatic group.

Claim 45

Dependent Claim 45 words

A process as claimed in claim 36, wherein said aromatic azido compound is selected from the group consisting of 4,4'-bis azido-diphenylsulfone, ##STR12## where R is a hydrocarbon radical having 1 to 6 carbon atoms, ##STR13## 2-azido benzoic acid, 3-azido benzoic acid, 4-azido benzoic acid, ##STR14##

Claim 46

Dependent Claim 11 words

A process as claimed in claim 41, wherein Ar is phenyl.

Claim 47

Dependent Claim 16 words

A process as claimed in claim 38, wherein said aromatic azido compound comprises a water-solubilizing moiety.

Claim 48

Dependent Claim 32 words

A process as claimed in claim 44, wherein said water-solubilizing moiety is selected from the group consisting of --COOH, --SO 3 H, phenolic OH and --SO 2 CH 2 SO 2 .

Claim 49

Dependent Claim 31 words

A process as claimed in claim 36, wherein the aromatic azido causes the fusible ink to show an exotherm in the temperature range of from about 170° C. to 200° C.

Claim 50

Dependent Claim 23 words

A process as claimed in claim 36, wherein the fusible ink comprises from about 5 to about 20 wt% pigment and a binder.

Claim 51

Dependent Claim 23 words

A process as claimed in claim 36, wherein the fusible ink is in the form of a layer 4-7 micrometers in dry thickness.

Claim 52

Dependent Claim 42 words

A process as claimed in claim 41, wherein said --Ar--N 3 moiety is linked to another --Ar--N 3 moiety via a C═O group, via an SO 2 group, via an unsaturated hydrocarbon group which may be substituted, via oxygen or via sulfur.

Claim 53

Dependent Claim 32 words

A process as claimed in claim 36, wherein the ink-bearing ribbon comprises the layer of ink, a support, a conductive layer, a resistive layer and the layer of the aromatic azido compound.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-10-28	1989-04-29	1989-10-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-10-28	1993-04-29	1993-10-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-10-28	1997-04-29	1997-10-29	$7700.00	Window Closed / Lapsed

Ink additives for efficient thermal ink transfer printing processes

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