Silicone composition and a paper treatment agent comprising the same

Abstract

Composition comprising: 100 parts by weight of an organopolysiloxane (A), 0.1 to 30 parts by weight of a crosslinking agent (B), 50 to 1,000 parts by weight of a polyvinyl alcohol homopolymer or copolymer (C), 0 to 5 parts by weight, as an active ingredient, of a catalyst (D), 100 to 100,000 parts by weight of water (E), and 0.1 to 100 parts by weight of a surfactant (F), wherein component (A) is an organopolysiloxane (A3) having at least two alkenyl groups and represented by the following formula (3): wherein each R 1 may be same or different and is a group having 1 to 20 carbon atoms selected from the group consisting of alkyl groups, alicyclic groups, and aryl groups, whose hydrogen atoms bonded to the carbon atoms may partly be replaced with a halogen atom or a cyano group, R2 is an alkenyl group and X 3 is the group represented by the following formula: wherein a3, b3, c3, d3 and e3 are such numbers that the organopolysiloxane (A3) has a viscosity at 25 degrees C of from 0.05 to 500 Pa·s, and b3, c3,d3 and e3 may be zero, and α and β are integers of from 0 to 3 and component (B) is an organohydrogenpolysiloxane (B3) having at least three SiH groups per molecule.

1 . A composition comprising the following components: 
 100 parts by weight of an organopolysiloxane (A),    0.1 to 30 parts by weight of a crosslinking agent (B),    50 to 1,000 parts by weight of a polyvinyl alcohol homopolymer or copolymer(C),    0 to 5 parts by weight, as an active ingredient, of a catalyst (D),    100 to 100,000 parts by weight of water (E), and    0.1 to 100 parts by weight of a surfactant (F),    wherein    component (A) is a mixture of    an organopolysiloxane (A2) having at least two hydroxyl groups and represented by the following average compositional formula (2)                          wherein each R 1  may be same or different and is a group having 1 to 20 carbon atoms selected from the group consisting of alkyl groups, alicyclic groups, and aryl groups, whose hydrogen atoms bonded to the carbon atoms may partly be replaced with a halogen atom or a cyano group, R 3  is a hydroxyl group, and X 2  is the group represented by the following formula:                          wherein a2, b2, c2 and d2 are such numbers that the organopolysiloxane (A2) has a viscosity at 25 degrees C of from 0.05 to 500 Pa·s, and b2, c2 and d2 may be zero, and    an organopolysiloxane (A1) represented by the following average compositional formula (1):                          wherein each R 1  may be same or different and is a group having 1 to 20 carbon atoms selected from the group consisting of alkyl groups, alicyclic groups, and aryl groups, whose hydrogen atoms bonded to the carbon atoms may partly be replaced with a halogen atom or a cyano group, and X 1  is the group represented by the following formula:                          wherein a1,b1 and d1 are such numbers that the organopolysiloxane (A1) has a viscosity at 25 degrees C of from 0.05 to 500 Pa·s, and b1 and d1 may be zero, and    component (B) is an organopolysiloxane (B2) having at least three SiH or hydrolyzable groups per molecule.    
     
     
         2 . The composition according to  claim 1 , wherein the organopolysiloxane (B2) is represented by the following formula:  
         R 1   f H g SiO (4-f-g)/2 , or  R 1   f W g SiO (4-f-g)/2    
       wherein R 1  is as defined above, W is a hydrolyzable group, f and g are numbers with 0≦f≦3, 0<g≦3, and 1≦f+g≦3.  
     
     
         3 . The composition according to  claim 2 , wherein W is at least one selected from the group consisting of alkoxy groups, acyloxy groups, amino groups, amido groups and oxime groups.  
     
     
         4 . The composition according to  claim 1 , wherein the composition further contains a silane (G) containing a hydrolyzable group and/or a condensate thereof in an amount of 1 to 250 parts by weight.  
     
     
         5 . The composition according to  claim 4 , wherein the component (G) has at least two hydrolyzable groups per molecule selected from the group consisting of alkoxy groups, acyloxy groups, and oxime groups.  
     
     
         6 . The composition according to  claim 1 , wherein the component (C) is a polyvinyl alcohol copolymer of a vinyl acetate monomer with a co-monomer of 5 mole % or smaller based on a total amount of the monomer and the co-monomer.  
     
     
         7 . The composition according to  claim 6 , wherein the co-monomer is at least one selected from the group consisting of acrylic acid and derivatives thereof, methacrylic acid and derivatives thereof, styrene and derivatives thereof, alkenes having 4 carbon atoms, maleic anhydride and vinyl chloride.  
     
     
         8 . The composition according to  claim 1 , wherein the component (C) is at least one kind of polyvinyl alcohol homopolymer having a viscosity in a 4% aqueous solution at 20 degrees C of 2 to 80 mPa·s and a degree of saponification of from 80 to 99.5 mole %.  
     
     
         9 . A paper treatment agent comprising the composition according to  claim 1 .  
     
     
         10 . Paper treated with the paper treatment agent according to  claim 9.