Anti-soiling agent composition

Abstract

[Object] To provide an anti-soiling agent compound that can sufficiently prevents adhesion of pitch to a dry part region. [Solution] The present invention provides an anti-soiling agent composition is provided with: a low molecular polysiloxane compound represented by the following formula (1); and a high molecular polysiloxane compound represented by the following formula (2), and characterized in that the number of modified groups per low molecular polysiloxane compound is in a range from 0.1 to 3, the number of modified groups per high molecular polysiloxane compound is in a range from 1.0 to 10, and the number m of repeating polysiloxane units in the low molecular polysiloxane compound and the number n of repeating polysiloxane units in the high molecular polysiloxane compound have the following relationship: 2 m≦n, [in formula (1), substituent R 1 represents a methyl group or a modified group, with the repeating number m being set to an integer from 20 to 200], and [in formula (2), substituent R 2 represents a methyl group or a modified group, with the repeating number n representing an integer].

1 . An anti-soiling agent compound for preventing pitch contamination in a dry part of a paper-making process comprising:
 a low molecular polysiloxane compound for dispersing pitch, represented by the following formula (1); and   a high molecular polysiloxane compound for use in forming a coat film on the dry part, represented by the following formula (2),   wherein the low molecular polysiloxane compound has a kinematic viscosity at 25° C. in a range from 10 to 300 mm 2 /s, while the high molecular polysiloxane compound has a kinematic viscosity at 25° C. in a range from 40 to 90000 mm 2 /s, and   wherein the number of modified groups per low molecular polysiloxane compound is in a range from 0.1 to 3.0, the number of modified groups per high molecular polysiloxane compound is in a range from 1.0 to 10, and the number m of repeating polysiloxane units in the low molecular polysiloxane compound and the number n of repeating polysiloxane units in the high molecular polysiloxane compound have the following relationship: 2 m∥=n,   
       
         
           
           
               
               
           
         
       
       wherein substituent R 1  represents a methyl group or a modified group, with the repeating number m being set to an integer from 20 to 50, and 
       
         
           
           
               
               
           
         
       
       wherein substituent R 2  represents a methyl group or a modified group, with the repeating number n representing an integer of less than 1430. 
     
     
         2 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the low molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group. 
     
     
         3 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the low molecular polysiloxane compound is represented by the following formula (3):
   —R 3 —NH—R 4 —NH 2   (3)
   
       wherein each of substituent R 3  and substituent R 4  represents an alkylene group having 1 to 6 carbon atoms independently. 
     
     
         4 . The anti-soiling agent composition according to  claim 3 , wherein each of substituent R 3  and substituent R 4  represents an ethylene group or a propylene group. 
     
     
         5 . The anti-soiling agent composition according to  claim 3 , wherein a substituent R 3  represents a propylene group and a substituent R 4  represents an ethylene group. 
     
     
         6 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the low molecular polysiloxane compound is represented by the following formula (4):
   —R 5 —NH 2   (4)
   
       wherein a substituent R 5  represents an alkylene group having 1 to 6 carbon atoms. 
     
     
         7 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the high molecular polysiloxane compound is at least one member selected from the group consisting of an amino-modified group, an epoxy-modified group, a polyether-modified group, a carboxyl-modified group and a phenyl-modified group. 
     
     
         8 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the high molecular polysiloxane compound is represented by the following formula (5):
   —R 6 —NH—R 7 —NH 2   (5)
   
       wherein each of substituent R 6  and substituent R 7  represents an alkylene group having 1 to 6 carbon atoms independently. 
     
     
         9 . The anti-soiling agent composition according to  claim 8 , wherein each of substituent R 6  and substituent R 7  represents an ethylene group or a propylene group independently. 
     
     
         10 . The anti-soiling agent composition according to  claim 8 , wherein a substituent R 6  represents a propylene group and a substituent R 7  represents an ethylene group independently. 
     
     
         11 . The anti-soiling agent composition according to  claim 1 , wherein the modified group in the high molecular polysiloxane compound is represented by the following formula (6):
   —R 8 —NH 2   (6)
   
       wherein a substituent R 8  represents an alkylene group having 1 to 6 carbon atoms. 
     
     
         12 . The anti-soiling agent composition according to  claim 1 , further comprising an emulsifier for emulsifying the low molecular polysiloxane compound and the high molecular polysiloxane compound,
 wherein the emulsifier is polyethylene decyl ether, polyethylene cetyl ether or polyethylene stearyl ether.   
     
     
         13 . The anti-soiling agent composition according to  claim 12 , wherein the high molecular polysiloxane compound has a compounding ratio in a range from 1 to 20% by weight, the low molecular polysiloxane compound has a compounding ratio in a range from 5 to 20% by weight, the emulsifier has a compounding ratio in a range from 0.05 to 0.4 parts by weight relative to 1 part by weight of a mixture of the high molecular polysiloxane compound and the low molecular polysiloxane compound, and the low molecular polysiloxane compound has a compounding ratio in a range from 0.25 to 10 parts by weight relative to 1 part by weight of the high molecular polysiloxane compound. 
     
     
         14 . The anti-soiling agent composition according to  claim 1 , which is applied to a canvas of a dry part for use therein, and wherein the number m of repeating polysiloxane units in the low molecular polysiloxane compound is an integer in a range from 20 to 50, and the number n of repeating polysiloxane units in the high molecular polysiloxane compound is an integer in a range from 40 to 280. 
     
     
         15 . The anti-soiling agent composition according to  claim 1 , which is applied to a cylinder of a dry part for use therein, and wherein the number m of repeating polysiloxane units in the low molecular polysiloxane compound is an integer in a range from 20 to 50, and the number n of repeating polysiloxane units in the high molecular polysiloxane compound is an integer of 280 or more. 
     
     
         16 . The anti-soiling agent composition according to  claim 1 , which is sprayed to the dry part by using a spraying nozzle, and wherein the sprayed amount thereof per unit area of paper passing therethrough is set in a range from 10 μg/m 2  to 10000 μg/m 2  as a solid component of the polysiloxane compound.