Thermal transfer material and thermal transfer recording method

Claim 2

A thermal transfer recording method for printing indicia and performing lift-off correction, comprising: providing a self-correcting thermal transfer material comprising at least a support, a first layer, a second layer, a third layer and a fourth layer disposed in this order on the support; said first layer being substantially non-transferable and capable of adhering to the support on heating and lift-off correction, and predominantly comprising a water-soluble polyester resin having a glass transition temperature of 30° C. or lower; said second layer being capable of causing separation of the third layer from the first layer on heating; said third and fourth layers predominantly comprising a thermoplastic resin, at least said third layer containing a colorant and said fourth layer substantially free of colorant; superposing the transfer material on a recording medium so that the fourth layer is closer than the support to the recording medium; heating the transfer material in a pattern sufficient to permit separation of said third layer from said first layer; separating the transfer material from the recording medium immediately after the transfer material is heated and before the second layer restores its cohesive strength before said heating, thereby separating the third layer from the first layer and to leave a recorded image on the recording medium; causing the transfer material to adhere to the recorded image under heating; and separating the transfer material from the recording medium without causing separation of the second layer, thereby to peel at least a part to the recorded image from the recording medium toward the transfer material.

Claim 3

A method according to claim 1, wherein said first layer comprises 70-100 wt. % thereof of the water-soluble polyester resin.

Claim 4

A method according to claim 2, wherein said first layer comprises 90-100 wt. % thereof of the water-soluble polyester resin.

Claim 5

A method according to claim 1, wherein said water-soluble polyester resin has a weight-average of 5,000-30,000.

Claim 6

A method according to claim 1, wherein said water-soluble polyester resin comprises a glycol (HO--R 1 --OH) or a polyester glycol having a hydroxyl group at the end thereof; a dicarboxylic acid (HOOC--R 2 --COOH); and a monomer having a sulfonic acid salt group or carboxylic acid group in addition to two carboxylic acid groups.

Claim 7

A method according to claim 1, wherein said second layer has a melting point of 50° C. or higher and a melt viscosity of 500 cps or lower at 150° C.

Claim 8

A method according to claim 1, wherein said second ink layer comprises 80 wt. % or more thereof of a wax.

Claim 9

A method according to claim 7, wherein said second layer comprises 90 wt. % or more thereof of a wax.

Claim 10

A method according to claim 1, wherein said third layer contains 5-80 wt % thereof of a colorant and said fourth ink layer contains 5 wt. % or less thereof of a colorant.

Claim 11

A method according to claim 9, wherein said third layer contains a binder comprising 50 wt. % or more thereof of a thermoplastic resin.

Claim 12

A method according to claim 10, wherein said binder comprises 70 wt. % or more thereof of the thermoplastic resin.

Claim 13

A method according to claim 9, wherein said fourth layer comprises a binder comprising 50 wt. % or more thereof of a thermoplastic resin.

Claim 14

A method according to claim 12, wherein said binder comprises 70 wt. % or more thereof of the thermoplastic resin.

Claim 15

A thermal transfer recording method for printing indicia and performing lift-off correction comprising: providing a self-correcting thermal transfer material comprising at least a support, a first layer, a second layer, a third layer and a fourth layer disposed in this order on the support; said first layer being substantially non-transferable and capable of adhering to the support on heating and lift-off correction, and predominantly comprising a water-soluble polyester resin having a glass transition temperature of 30° C. or lower; said second layer being capable of causing separation of the third layer from the first layer on heating and including a water-soluble polyester resin having a glass transition temperature of 30° C. or lower; said third and fourth layers predominantly comprising a thermoplastic resin, at least said third layer containing a colorant and said fourth layer substantially free of colorant; superposing the transfer material on a recording medium so that the fourth layer is closer to the support than the recording medium; heating the transfer material in a pattern sufficient to permit separation of said third layer from said first layer; separating the transfer material from the recording medium immediately after the transfer material is heated and before the second layer restores its cohesive strength before said heating, thereby separating the third layer from the first layer and to leave a recorded image on the recording medium; causing the transfer material to adhere to the recorded image under heating; and separating the transfer material from the recording medium without causing separation of the second layer, thereby to peel at least a part of the recorded image from the recording medium toward the transfer material.

Claim 16

A thermal transfer recording method for printing indicia and performing lift-off correction comprising: providing a self-correcting thermal transfer material comprising at least a support, a first layer, a second layer, a third layer and a fourth layer disposed in this order on the support; said first layer being substantially non-transferable and capable of adhering to the support on heating and lift-off correction, and predominantly comprising a water-soluble polyester resin having a glass transition temperature of 30° C. or lower; said second layer being capable of causing separation of the third layer from the first layer on heating and including a water-soluble polyester resin having a glass transition temperature of 30° C. or lower; said third and fourth layers predominantly comprising a thermoplastic resin, at least said third layer containing a colorant and said fourth layer substantially free of colorant; superposing the transfer material on a recording medium so that the fourth layer is closer to the support than the recording medium; heating the transfer material in a pattern sufficient to permit separation of said third layer from said first layer; separating the transfer material from the recording medium immediately after the transfer material is heated and before the second layer restores its cohesive strength before said heating, thereby separating the third layer from the first layer and to leave a recorded image on the recording medium; causing the transfer material to adhere to the recorded image under heating; and separating the transfer material from the recording medium without causing separation of the second layer, thereby to peel at least a part of the recorded image from the recording medium toward the transfer material.

Claim 17

A method according to claim 14, wherein said first layer comprises 70-100 wt. % thereof of the water-soluble polyester resin.

Claim 18

A method according to claim 14, wherein said first layer comprises 90-100 wt. % thereof of the water-soluble polyester resin.

Claim 19

A method according to claim 14, wherein said second layer comprises a wax and the water-soluble polyester resin which constitutes 45 wt. % or less of the second ink layer.

Claim 20

A method according to claim 17, wherein said water-soluble polyester resin constitutes 40 wt. % or less of the second ink layer.

Claim 21

A method according to claim 17, wherein said wax contained in the second layer has a melting point of 50° C. or higher and a melt viscosity of 500 cps or lower at 150° C.

Claim 22

A method according to claim 14, wherein said water-soluble polyester resin constituting the second layer has a weight-average molecular weight of 5,000-25,000.

Claim 23

A method according to claim 14, wherein said water-soluble polyester resin constituting the first layer and that constituting the second ink layer comprises a glycol (HO--R 1 --OH) or a polyester glycol having a hydroxyl group at the end thereof; a dicarboxylic acid (HOOC--R 2 --COOH); and a monomer having a sulfonic acid salt group or carboxylic acid group in addition to two carboxylic acid groups.

Claim 24

A method according to claim 14, wherein said water-soluble polyester resin constitutes 70-100 wt. % of the first layer; said second ink layer comprises a wax and the water-soluble polyester resin which constitutes 45 wt. % or less of the second ink layer; said third ink layer contains 10-80 wt. % thereof of a colorant and said fourth ink layer contains 5 wt. % or less thereof of a colorant; and each of said third and fourth ink layers comprises a binder comprising 50 wt. % or more thereof of the thermoplastic resin.

Claim 25

A method according to claim 22, wherein the water-soluble polyester resin comprises a glycol (HO--R 1 --OH) or a polyester glycol having a hydroxyl group at the end thereof; a dicarboxylic acid (HOOC--R 2 --COOH); and a monomer having a sulfonic acid salt group or carboxylic acid group in addition to two carboxylic acid groups.