07-01-2021 дата публикации
Номер: US20210002215A1
The presently claimed invention relates to a color developer, a process for its manufacture and its use as a component in heat sensitive recording material. The heat sensitive recording material is useful for thermographic printing. 40. The compound according to claim 3 , wherein the compound is a crystalline polymorph form α that is characterized by an X-ray powder diffraction pattern comprising 2Θ reflections claim 3 , plus or minus 0.2 degrees 2Θ claim 3 , at 5.5 claim 3 , 6.1 claim 3 , 6.4 claim 3 , 12.1 claim 3 , 16.1 claim 3 , 16.8 claim 3 , 17.1 claim 3 , 18.3 claim 3 , 19.1 claim 3 , 19.9 claim 3 , 20.2 claim 3 , 21.4 claim 3 , 22.1 claim 3 , 22.7 claim 3 , 23.3 claim 3 , 24.3 claim 3 , 24.7 claim 3 , 25.0 claim 3 , 26.4 claim 3 , 27.7 and 29.3.5. The compound according to claim 3 , wherein the compound is a crystalline polymorph form β that is characterized by an X-ray powder diffraction pattern comprising 2Θ reflections claim 3 , plus or minus 0.2 degrees 2Θ claim 3 , at 6.2 claim 3 , 8.1 claim 3 , 10.1 claim 3 , 11.8 claim 3 , 12.2 claim 3 ,13.4 claim 3 , 14.1 claim 3 , 15.3 claim 3 , 16.1 claim 3 ,17.2 claim 3 ,18.4 claim 3 , 19.1 claim 3 , 20.6 claim 3 , 21.4 claim 3 , 22.4 claim 3 , 24.5 claim 3 , 25.0 claim 3 , 25.9 claim 3 , 26.2 claim 3 , 26.9 and 28.4.7. The process according to claim 6 , wherein the chlorination agent is selected from the group of thionyl chloride claim 6 , POCl claim 6 , PCland oxalyl chloride.8. The process according to claim 6 , wherein acid chloride (IVb) is 5-sulfonylchloride-isophthalic acid dichloride.10. The process according to claim 6 , wherein step c. comprises reacting the acid chloride of formula (IVb) with an amine RNHto obtain compound of formula (I) claim 6 , wherein Ris identical to R.11. The process according to claim 6 , wherein the amine is m-toluidine.13. (canceled)15. The heat sensitive recording material according to claim 14 , wherein the weight ratio of color developer to color former is in the range of 1. ...
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