Claims
- 1. A process for producing a thermosensitive recording material comprising a matrix of an electrically insulating, film-forming thermoplastic resin and, dispersed as a fine powder in the matrix, at least one linear aliphatic dicarboxylic acid having at least 13 carbon atoms and a melting point of not more than 150.degree. C. or its ammonium salt, the amount of the linear aliphatic dicarboxylic acid or its ammonium salt being 5 to 40 parts by weight per 100 parts by weight of the resin matrix, which comprises intimately mixing a solution or dispersion of the electrically insulating, film-forming thermoplastic resin with 5 to 40 parts by weight per 100 parts by weight of the resin of the linear aliphatic dicarboxylic acid or its ammonium salt, and drying the resulting mixture at a temperature of not more than 40.degree. C.
- 2. The process of claim 1 wherein the thermoplastic resin has a glass transition temperature of not more than 70.degree. C.
- 3. The process of claim 1 wherein the thermoplastic resin has a softening temperature of about 75.degree. to about 170.degree. C.
- 4. The process of claim 1 wherein the thermoplastic resin is an acrylic resin.
- 5. The process of claim 1 which further mixing the solution or dispersion with a phenolic compound.
- 6. The process of claim 5 wherein the amount of the phenolic compound is at most 20 parts by weight per 100 parts by weight of the resin matrix.
- 7. The process of claim 1 wherein the linear aliphatic dicarboxylic acid contains from 13 to 26 carbon atoms.
- 8. The process of claim 1 wherein the linear aliphatic dicarboxylic acid or its salt is uniformly dispersed as a fine powder in the solution or dispersion of the thermoplastic resin by vigorously stirring the solution or dispersion and the dicarboxylic acid or its salt mechanically.
- 9. The process of claim 8 wherein the stirring is carried out by using a pulverizer or high-speed shear stirrer or by applying ultrasonic irradiation.
- 10. The process of claim 1 wherein the dicarboxylic acid or its salt is mixed in the form of a solution with the solution or dispersion of the thermoplastic resin.
- 11. The process of claim 1 wherein the mixing is performed at room temperature, or an elevated temperature of up to about 60.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52-154855 |
Dec 1977 |
JPX |
|
Parent Case Info
This application is a division of application Ser. No. 136,068, filed Mar. 28, 1980, which application is in turn a continuation of application Ser. No. 971,833, filed Dec. 19, 1978, now abandoned).
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3924049 |
Truitt et al. |
Dec 1975 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
136068 |
Mar 1980 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
971833 |
Dec 1978 |
|