Heat transfer printing sheet and heat transfer printing method using the same

Claim 2

A heat transfer printing sheet characterized in that a pattern comprising a basic dye having a poor heat transferable property, an alkaline agent having a property of increasing the heat transferable property of the basic dye and a binder is formed on a base support sheet and also a resin film through which the basic dye can be passed when the heat transfer printing is carried out, but can not be passed through when the heat transfer printing is not carried out is formed on the pattern.

Claim 3

A process for heat transfer printing which comprises contacting a heat transfer printing sheet having a pattern comprising (1) a basic dye which will not sublime, melt or evaporate at the temperature employed in the heat transfer printing step, (2) from 0.1 to 20 molar equivalent of an alkaline agent per molar equivalent of basic dye and (3) a binder therefor formed on a support sheet, with a material to which said pattern is to be heat transfer printed, and heating said sheet and said material together to transfer said dye to said material.

Claim 4

A process for heat transfer printing which comprises contacting a heat transfer printing sheet having a pattern comprising (1) a basic dye which will not sublime, melt or evaporate at the temperature employed in the heat transfer printing step, (2) from 0.1 to 20 molar equivalent of an alkaline agent per molar equivalent of basic dye and (3) a binder therefor formed on a support sheet, with a material to which said pattern is to be heat transfer printed, and heating said sheet and said material together to transfer said dye to said material.

Claim 5

The process of claim 2, wherein the heating step is conducted under pressure.

Claim 6

The process of claim 2, wherein the material to which said pattern is to be heat transfer printed is selected from the group consisting of wool, silk, and acetate fibers; and fibers and films of polyamides, polyacrylonitrile and polyvinyl chloride.

Claim 7

The process of claim 2, wherein the heating is carried out at a temperature of about 80° to 250° C.

Claim 8

The process of claim 3, wherein said pressure is about 50 g/cm 2 to 20 kg/cm 2 .

Claim 9

The process of claim 6, wherein the heating under pressure is carried out for about 30 to 90 seconds.

Claim 10

The process of claim 2, wherein the amount of alkaline agent in the heat transfer printing sheet is 1 to 10 molar equivalent of alkaline agent per molar equivalent of basic dye.

Claim 11

The process of claim 2, wherein a color layer comprising the basic dye, alkaline agent and binder covers the whole surface of the heat transfer printing sheet and a masking member having an open pattern is laminated on said color layer, said material to which the pattern is to be heat transfer printed being brought into contact with said pattern under heat and pressure.

Claim 12

The process of claim 2, wherein said heat transfer printing sheet further comprises an overcoat resin coated thereover.

Claim 13

The process of claim 2, wherein said support sheet is made of a material which is resistant to the temperature of heat transfer printing.

Claim 14

The process of claim 2, wherein said alkaline agent is sodium hydroxide or potassium hydroxide.

Claim 15

The process of claim 2, wherein said basic dye is selected from the group consisting of Aizen Cathilon Yellow 3GLH (C.I. 48055), Aizen Cathilon Red 6BH (C.I. 48020), Malachite Green (C.I. 42000), Crystal Violet (C.I. 42555), Aizen Cathilon Blue 5G (C.I. 51005), Aizen Basic Cyanine 6GH (C.I. 42025), Aizen Methylene Blue FZ (C.I. 52015), Aizen Cathilon Brilliant Yellow 5GLH (C.I. Basic yellow 13), Aizen Cathilon Orange RH (C.I. 48040) and Astrazon Pink FG (C.I. 48015).

Claim 16

The process of claim 13, wherein said alkaline agent is sodium hydroxide or potassium hydroxide.

Claim 17

The process of claim 10, wherein said resin is water-soluble and is selected from the group consisting of polyvinyl alcohol, sodium polyacrylate and polyvinyl pyrrolidone.

Claim 18

The process of claim 10, wherein said resin is oil-soluble and is selected from the group consisting of xylene resins, rosin-modified phenol resins, polyvinyl butyral, epoxy resins, polystyrene and petroleum resins.

Claim 19

The process of claim 10, wherein said heat transfer printing sheet is coated with a resin film on the backside thereof.

Claim 20

In a temporary carrier for use in the dry transfer printing or dyeing process said temporary carrier comprising an inert, heat-resistant base sheet bearing on at least one face thereof a transfer coating the improvement according to which the transfer coating comprises (a) a layer comprising (1) at least one cationic dyestuff which after reacting with an alkalizing agent passes into the vapor state at a temperature of from 160° C. to 210° C. and (2) a binder which upon drying forms a film sufficient to bond the dyestuff to the carrier base, which film is inert to the dyestuff and does not decompose under conditions of transfer, and (b) a layer comprising (1) an alkalizing agent which is capable of reacting with cationic dyestuff present in layer (a) to render said dyestuff vaporizable at a temperature of from 160° C. to 210° C. said agent being selected from the group consisting of an alkali or alkaline earth metal hydroxide and an alkali or alkaline earth metal salt of a weak acid and (2) a binder which is stable to electrolytes, which upon drying forms a film which is inert to dyestuff present during transfer and which does not decompose under conditions to transfer.

Claim 21

In a temporary carrier for use in the dry transfer printing or dyeing process said temporary carrier comprising an inert, heat-resistant base sheet bearing on at least one face thereof a transfer coating the improvement according to which the transfer coating comprises (a) a layer comprising (1) at least one cationic dyestuff which after reacting with an alkalizing agent passes into the vapor state at a temperature of from 160° C. to 210° C. and (2) a binder which upon drying forms a film sufficient to bond the dyestuff to the carrier base, which film is inert to the dyestuff and does not decompose under conditions of transfer, and (b) a layer comprising (1) an alkalizing agent which is capable of reacting with cationic dyestuff present in layer (a) to render said dyestuff vaporizable at a temperature of from 160° C. to 210° C. said agent being selected from the group consisting of an alkali or alkaline earth metal hydroxide and an alkali or alkaline earth metal salt of a weak acid and (2) a binder which is stable to electrolytes, which upon drying forms a film which is inert to dyestuff present during transfer and which does not decompose under conditions to transfer.

Claim 22

A temporary carrier according to claim 18, wherein the alkalizing agent is selected from the group consisting of sodium, potassium or lithium hydroxide, sodium, potassium or lithium carbonate, and sodium carboxylate.

Claim 23

A temporary carrier according to claim 18, wherein cationic dyestuff present has a molecular weight not in excess of 400.

Claim 24

A temporary carrier according to claim 18, wherein layer (a) overlies layer (b).

Claim 25

A temporary carrier according to claim 18, wherein the base sheet is parchment paper.

Claim 26

A temporary carrier according to claim 18, wherein the binder of layers (a) and (b) is ethyl cellulose.

Claim 27

A temporary carrier according to claim 18, wherein the binder of layer (a) is ethyl cellulose and the binder of layer (b) is polyvinyl alcohol.

Claim 28

In a method for the dry transfer printing or dyeing or organic material which comprises bringing into contact the surface of the organic material to be dyed or printed and the transfer coated surface of a temporary carrier, subjecting the temporary carrier and organic material to heating at a temperature of about 80° to 250° C. for a time sufficient to effect transfer and separating the organic material and temporary carrier, the improvement according to which the organic material is a material which can be dyed or printed with cationic dyestuff, the temporary carrier is as defined in claim 18, and the time of heating to effect transfer is sufficient to permit reaction between the alkalizing agent and cationic dyestuff and for the thus formed vaporizable to pass from the temporary carrier to the organic material and to penetrate into the said organic material.