Silicone composition, silicone emulsion composition, and fiber treatment agent

Abstract

Provided is a silicone composition having high curability even under low-temperature treatment conditions, and exceptional storage stability, the silicone composition being capable of imparting excellent flexibility to fibers as a fiber treatment agent, and also having exceptional washing durability; specifically, a silicone composition containing (A) 70-98 parts by mass of organopolysiloxane having a group represented by formula (1) at the end of the molecule or in a side chain (in the formula, R x is a C1-8 divalent hydrocarbon group, a is an integer of 0-4, R y are each independently a hydrogen atom, C1-10 monovalent hydrocarbon group, or acyl group, and at least one group shown by R y is hydrogen) and (B) 2-30 parts by mass of blocked polyisocyanate having two or more isocyanate groups per molecule, 50% or more of these isocyanate groups being blocked by a thermally dissociable blocking agent.

1 . A silicone composition comprising:
 (A) 70 to 98 parts by weight of an organopolysiloxane having, at an end of the molecule or on a side chain, a group of general formula (1) below   
       
         
           
           
               
               
           
         
       
       wherein R x  is a divalent hydrocarbon group of 1 to 8 carbon atoms; the letter “a” is an integer from 0 to 4; and each R y  is independently a hydrogen atom, a monovalent hydrocarbon group of 1 to 10 carbon atoms or an acyl group, with the proviso that at least one R y  is a hydrogen atom; and
 (B) 2 to 30 parts by weight of a blocked polyisocyanate which has at least two isocyanate groups per molecule, at least 50 mol % of the isocyanate groups being capped with a thermally labile blocking agent. 
 
     
     
         2 . The silicone composition of  claim 1 , wherein component (A) is selected from among organopolysiloxanes of general formulas (2) to (4) below 
       
         
           
           
               
               
           
         
       
       wherein each R 4  is independently a group of general formula (1) below 
       
         
           
           
               
               
           
         
       
       R x  being a divalent hydrocarbon group of 1 to 8 carbon atoms;
 the letter “a” being an integer from 0 to 4; and each R y  being independently a hydrogen atom, a monovalent hydrocarbon group of 1 to 10 carbon atoms or an acyl group, with the proviso that at least one R y  is a hydrogen atom; each R 2  is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 12 carbon atoms; each R 3  is independently —OX, wherein X is a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group of 1 to 12 carbon atoms; each R 1  is independently a group selected from the options for R 2  or R 3 ; each q is independently an integer from 0 to 3 and each r is independently 0 or 1, such that the sum q+r is 0 to 3 at each end, with the proviso that at least one end in general formula (2) and general formula (4) has a R 4 ; n is an integer from 10 to 500; and m is an integer from 1 to 10. 
 
     
     
         3 . The silicone composition of  claim 1 , wherein component (B) is a blocked polyisocyanate obtained by using a heat-labile blocking agent to cap a polyisocyanate compound polymerized from an aliphatic and/or alicyclic diisocyanate. 
     
     
         4 . The silicone composition of  claim 1 , wherein component (B) is a blocked polyisocyanate which is polymers of diisocyanates and has at least two isocyanate groups per molecule, at least 50 mol % of the isocyanate groups being capped with a thermally labile blocking agent. 
     
     
         5 . The silicone composition of  claim 1 , wherein the thermally labile blocking agent of component (B) is at least one compound selected from the group consisting of oxime compounds, pyrazole compounds and active ethylene compounds. 
     
     
         6 . The silicone composition of  claim 1  which includes, as component (A) and component (B), a reaction product of at least one NH group included in the organopolysiloxane of component (A) with an isocyanate group of component (B). 
     
     
         7 . A silicone emulsion composition comprising the silicone composition of  claim 1 . 
     
     
         8 . A textile treatment comprising the silicone composition of  claim 1 .