# US 5,352,527 A · Thermal image transfer recording medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,352,527 A - Document ID: US5352527A - Status: Granted - Kind: A - Application number: 07/946,609 - Filed: 1992-09-18 - Granted: 1994-10-04 - Earliest claimed: 1991-09-19 - Assignees: Ricoh Company, Ltd. - Inventors: Shigeyuki Harada; Yoshihiko Hiyoshi; Takeshi Yuyama; Keishi Taniguchi - Web page: https://patentgrep.com/patent/US5352527A ## CPC - B41M 5/443: {Silicon-containing polymers, e.g. silicones, siloxanes} - Y10S 428/913: Material designed to be responsive to temperature, light, moisture - Y10S 428/914: Transfer or decalcomania - Y10T 428/24876: Intermediate layer contains particulate material [e.g., pigment, etc.] - Y10T 428/31663: As siloxane, silicone or silane - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A thermal image transfer recording medium, containing a support, a thermal image transfer ink layer formed on the support, and a heat-resistant protective layer formed on the back side of the support, opposite to the thermal image transfer ink layer with respect to the support, the heat-resistant protective layer having a tensile strength effective to prevent the protective layer from adhering to a thermal head and to prevent loss of flexibility of the protective layer, the heat-resistant protective layer, containing an amount of each of (i) an amino-modified polysiloxane, (ii) a polyisocyanate and (iii) a reaction product of the amino-modified polysiloxane and the polyisocyanate effective for obtaining the tensile strength in the heat-resistant protective layer. ## Claims ### Claim 1 A thermal image transfer recording medium, comprising a support, a thermal image transfer ink layer formed on said support, and a heat-resistant protective layer formed on the back side of said support, opposite to said thermal image transfer ink layer with respect to said support, said heat-resistant protective layer having a tensile strength effective to prevent said protective layer from adhering to a thermal head and to prevent loss of flexibility of said protective layer, said heat-resistant protective layer, comprising an amount of each of (i) amino-modified polysiloxane, (ii) a polyisocyanate and (iii) a reaction product of said amino-modified polysiloxane and said polyisocyanate effective for obtaining said tensile strength in said heat-resistant protective layer. ### Claim 2 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a tensile strength in the range of 100 to 700 kg/cm.sup.2. ### Claim 3 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a breaking extension of at least, 50%. ### Claim 4 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said amine-modified polysiloxane includes at least one amine group at the end of a siloxane segment or in a side chain thereof. ### Claim 5 (depends on 4) The thermal image transfer recording medium as claimed in claim 4, wherein said amino-modified polysiloxane is selected from the group consisting of compounds (I), (II), (III), (IV), (V), (VI), and (VII): ##STR29## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a methyl group or a methoxy group, R.sup.5 and R.sup.6 each represent an alkylene group having 1 to 10 carbon atoms, and m and n each represent an integer of 1 to 20; ##STR30## wherein, R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a methyl group or a methoxy group, R.sup.5 represents an alkylene group having 1 to 10 carbon atoms, and m and n each represent an integer of 1 to 20; ##STR31## wherein n represents an integer of 1 to 300; ##STR32## wherein R.sup.7 represents an alkylene group having 1 to 10 carbon atoms, and n represents an integer of 1 to 300; ##STR33## wherein n represents an integer of 2 to 20; ##STR34## wherein R.sup.8 represents an alkylene group having 1 to 10 carbon atoms, and l, m and n each represent an integer of 1 to 300. ### Claim 6 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said polyisocyanate is selected from the group consisting of an aliphatic polyisocyanate compound having at least two isocyanate groups and an aromatic polyisocyanate compound having at least two isocyanate groups. ### Claim 7 (depends on 6) The thermal image transfer recording medium as claimed in claim 6, wherein said aliphatic polyisocyanate compound is 4-methoxy-2,4-diiaocyanate. ### Claim 8 (depends on 6) The thermal image transfer recording medium as claimed in claim 6, wherein said aromatic polyisocyanate compound is selected from the group consisting of toluene-2,4-diisocyanate, toluene-2,6-diimocyanate, 4-isopropyl-1,3-phenyleneaiisocyanate, 4-chloro-1,3-phenylenediisocyanate, 4-butoxy-1,3-phenylenediisocyanate, 2,4-diisocyanatediphenylether, 4,4-methylenebis(phenylisocyanate), 1,5-naphthalene diisocyanate, benzidine isocyanate, o-nitrobenzidine diisocyanate, 4,4-diisocyanate benzyl, m-phenylene diisocyanate, p-phenylene diisocyanate, 1,3-xylene diisocyanane, and 1,4-xylene diisocyanate. ### Claim 9 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a thickness of 0.1 to 3.0 .mu.m. ### Claim 10 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, further comprising an overcoat layer provided on said thermal image transfer ink layer. ### Claim 11 A thermal image transfer recording medium, comprising a support, a thermal image transfer ink layer formed on said support, and a heat-resistant protective layer formed on the back side of said support, opposite to said thermal image transfer ink layer with respect to said support, said heat-resistant protective layer having a tensile strength effective to prevent said protective layer from adhering to a thermal head and to prevent loss of flexibility of said protective layer, said heat-resistant protective layer, comprising an amount of each of (i) an amino-modified polysiloxane, (ii) a polyisocyanate and (iii) a reaction product of an aromatic diamine and said polyisocyanate effective for obtaining said tensile strength in said heat-resistant protective layer. ### Claim 12 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said heat-resistant protective layer has a tensile strength in the range of 100 to 700 kg/cm.sup.2. ### Claim 13 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said heat-resistant protective layer has a breaking extension of at least, 50%. ### Claim 14 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said amino-modified polysiloxane include at least one amino group at the end of a siloxane segment or in a side chain thereof. ### Claim 15 (depends on 14) The thermal image transfer recording medium as claimed in claim 14, wherein said amino-modified polysiloxane is selected from the group consisting of compounds (I), (II), (III), (IV), (V), (VI) and (VII): ##STR35## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a methyl group or a methoxy group, R.sup.5 and R.sup.6 each represent an alkylene group having 1 to 10 carbon atoms, and m and n each represent an integer of 1 to 20; ##STR36## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 each represent a methyl group or a methoxy group, R.sup.5 represents an alkylene group having 1 to 10 carbon atoms, and m and n each represents an integer of 1 to 20; ##STR37## wherein n represents an integer of 1 to 300; ##STR38## wherein R.sup.7 represents an alkylene group having 1 to 10 carbon atoms, and n represents an integer of 1 to 300; ##STR39## wherein n represents an integer of 2 to 20; ##STR40## wherein R.sup.8 represents an alkylene group having 1 to 10 carbon atoms, and l, m and n each represent an integer of 1 to 300. ### Claim 16 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said polyisocyanate is selected from the group consisting of an aliphatic polyisocyanate compound having at least two isocyanate groups and an aromatic polyisocyanate compound having at least two isocyanate groups. ### Claim 17 (depends on 16) The thermal image transfer recording medium as claimed in claim 16, wherein said aliphatic polyisocyanate compound is 4-methoxy-2,4-dlisocyanate. ### Claim 18 (depends on 16) The thermal image transfer recording medium as claimed in claim 16, wherein said aromatic polyisocyanate compound is selected from the group consisting of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, 4-isopropyl-1,3-phenylenediisocyanate, 4-chloro-1,3-phenylenediisocyanate, 4-butoxy-1,3-phenylenediisocyanate, 2,4-diisocyanatediphenylether, 4,4-methylenebis(phenylisocyanate), 1,5-naphthalene diisocyanate, benzidineisocyanate, o-nitrobenzidine diisocyanate, 4,4-diisocyanate benzyl, m-phenylene diisocyanate, p-phenylene diisocyanate, 1,3-xylene diizocyanate, and 1,4-xylene diisocyanate. ### Claim 19 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said aromatic diamine is selected from the group consisting of: ##STR41## wherein R.sup.11 represents ##STR42## in which R.sup.12 and R.sup.13 each represent an aryl group having 1 to 30 carbon atoms or an alkyl group having 1 to 30 carbon atoms, and n represents an integer of 1 to 3; ##STR43## ### Claim 20 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, wherein said heat-resistant protective layer has a thickness of 0.1 to 3.0 .mu.m. ### Claim 21 (depends on 11) The thermal image transfer recording medium as claimed in claim 11, further comprising an overcoat layer provided on said thermal image transfer ink layer. ### Claim 22 A thermal image transfer recording medium, comprising a support, a thermal image transfer ink layer formed on said support, and a heat-resistant protective layer formed on the back side of the support, opposite to the thermal image transfer ink layer with respect to the support, said heat-resistant protective layer having a tensile strength effective to prevent said protective layer from adhering to a thermal head and to prevent loss of flexibility of said protective layer, said heat-resistant protective layer, comprising an amount of each of (i) an alcohol-modified polysiloxane, (ii) a polyisocyanate and (iii) a reaction product of said alcohol-modified polysiloxane and said polyisocyanate effective for obtaining said tensile strength in said heat-resistant protective layer. ### Claim 23 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a tensile strength in the range of 100 to 700 kg/cm.sup.2. ### Claim 24 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a breaking extension of at least, 50%. ### Claim 25 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said alcohol-modified polysiloxane has an alcohol hydroxyl group at the end of a siloxane segment or in a side chain thereof. ### Claim 26 (depends on 25) The thermal image transfer recording medium as claimed in claim 25, wherein said alcohol-modified polysiloxane is selected from the group consisting of compounds (VIII), (IX), (X), (XI) and (XII): ##STR44## wherein R.sup.14 and R.sup.15 each represent an alkylene group having 1 to 10 carbon atoms, and n represents an integer of 1 to 300; ##STR45## wherein R.sup.16 represents an alkylene group having 1 to 10 carbon atoms, and m and n each represent an integer of 1 to 20; ##STR46## wherein n represents an integer of 0 to 300; ##STR47## wherein l represents an integer of 1 to 20, m represents an integer of 5 to 300, and n represents an integer of 1 to 10; and ##STR48## wherein R.sup.17 represents an alkylene group having 1 to 10 carbon atoms, and n represents an integer of 1 to 300. ### Claim 27 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said polyisocyanate is selected from the group consisting of an aliphatic polyisocyanate compound having at least two isocyanate groups and an aromatic polyisocyanate compound having at least two isocyanate groups. ### Claim 28 (depends on 27) The thermal image transfer recording medium as claimed in claim 27, wherein said aliphatic polyisocyanate compound is 4-methoxy-2,4-diisocyanate. ### Claim 29 (depends on 27) The thermal image transfer recording medium as claimed in claim 27, wherein said aromatic polyisocyanate compound is selected from the group consisting of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, 4-isopropyl-1,3-phenylene-diisocyanate, 4-chloro-1,3-phenylenediisocyanate, 4-butoxy-1,3-phenylenedi-isocyanate, 2,4-diisocyanatediphenylether, 4,4-methylenebis(phenylisocyanate), 1,5-naphthalene diisocyanate, benzidine isocyanate, o-nitrobenzidine diisocyanate, 4,4-diisocyanate benzyl, m-phenylene diisocyanate, p-phenylene diisocyanate, 1,3-xylene diisocyanate, and 1,4-xylene diisocyanate. ### Claim 30 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, wherein said heat-resistant protective layer has a thickness of 0.1 to 3.0 .mu.m. ### Claim 31 (depends on 1) The thermal image transfer recording medium as claimed in claim 1, further comprising an overcoat layer provided on said thermal image transfer ink layer.