Pressure sensitive record material employing diaryl alkane solvents

Abstract

A solvent for the pressure sensitive record material which consists of a normally liquid compound having 13 to 18 Carbon atoms and being represented by the following general formula: ##STR1## in which each of R 1 to R 5 is hydrogen, methyl group or etyl group R 6 is hydrogen, methyl, ethyl, iso-propyl, n-propyl, tert-buthyl or sec-buthyl group; and the preparation method of the above solvent from styrene and C 7 -C 10 aromatic hydrocarbons using sulfuric acid as the catalyst.

What is claimed is: 
     
       1. A pressure sensitive record material which comprises a paper sheet coated with microcapsules holding internally a liquid containing a dye-precursor and at least one compound represented by the general formula: ##STR13## in which R 1  and R 2  are hydrogen; R 3  is methyl; R 4  and R 5  are hydrogen, methyl or ethyl; R 6  is an alkyl group selected from methyl, ethyl, n-propyl, isopropyl, sec-butyl and tert-butyl, and the total carbon atom number of R 4 , R 5  and R 6  is 1-4. .Iadd. 
     
     
       2.  A pressure sensitive record material as claimed in claim 1 wherein the total carbon atom number of R 4 , R 5 , and R 6  is 3. .Iaddend. .Iadd.3. A pressure sensitive record material as claimed in claim 1 wherein said at least one compound is a mixture of compounds each having a total carbon atom number of R 4 , R 5 , and R 6  of 3. .Iaddend. .Iadd.4. A pressure sensitive record material as claimed in claim 2 wherein said at least one compound is a compound of the structural formula ##STR14## 
     
     
        .Iaddend. .Iadd.5.  A pressure sensitive record material as claimed in claim 1 wherein said at least one compound is a compound of the structural formula ##STR15## 
     
     
        .Iaddend. .Iadd.6.  A pressure sensitive record material as claimed in claim 1 wherein said at least one compound is a mixture of compounds each having a total carbon atom number of R 4 , R 5 , and R 6  of 1-2. .Iaddend. .Iadd.7. A pressure sensitive record material as claimed in claim 1 wherein said at least one compound is a mixture of compounds each having a total carbon atom number of R 4 , R 5 , and R 6  of 2. .Iaddend. .Iadd.8. A pressure sensitive record material as claimed in claim 7 wherein said at least one compound is a mixture of ##STR16## 
     
     
        .Iaddend. .Iadd.9.  A pressure sensitive record material as claimed in claim 1 wherein the total carbon atom number of R 4 , R 5 , and R 6  is 2. .Iaddend. .Iadd.10. A pressure sensitive record material as claimed in claim 9 wherein said at least one compound is ##STR17## 
     
     
        .Iaddend. .Iadd.11.  A pressure sensitive record material as claimed in claim 9 wherein said at least one compound is a mixture of compounds of the structural formula ##STR18## 
     
     
        .Iaddend. .Iadd.12.  A pressure sensitive record material as claimed in claim 9 wherein said at least one compound is ##STR19## 
     
     
        .Iaddend. .Iadd.13.  A pressure sensitive record material as claimed in claim 9 wherein said at least one compound is a compound of the structural formula ##STR20## 
     
     
        .Iaddend. .Iadd.14.  A pressure sensitive record material as claimed in claim 9 wherein said at least one compound is a mixture of compounds of the structural formula ##STR21## 
     
     
        .Iaddend. .Iadd.15.  A pressure sensitive record material as claimed in claim 1 wherein the total carbon atom number of R 4 , R 5 , and R 6  is 1. .Iaddend. .Iadd.16. A pressure sensitive record material as claimed in claim 15 wherein said at least one compound is a mixture of compounds of the structural formula ##STR22## .Iaddend.