Silicone rubber-based hardening resin composition, molded article, and medical tube

Abstract

The present invention provides a silicone rubber-based hardening composition which can produce a silicone rubber having excellent tensile strength and tear strength, a molded article which is made using the silicone rubber-based hardening composition, and a medical tube which is obtained by using the molded article, and the silicone rubber-based hardening composition according to the present invention contains linear organopolysiloxane having a vinyl group (A); linear organohydrogen polysiloxane (B); and silica filler (C) of which the surface is treated with a silane coupling agent having a trimethylsilyl group.

1 : A silicone rubber-based hardening composition comprising:
 a linear organopolysiloxane comprising a vinyl group (A);   a linear organohydrogen polysiloxane (B); and   a silica filler (C) of which the surface is treated with a silane coupling agent comprising a trimethylsilyl group.   
     
     
         2 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silicone rubber-based hardening composition further comprises:
 a silica filler (D) of which the surface is treated with a silane coupling agent comprising an organosilyl group comprising a vinyl group.   
     
     
         3 : The silicone rubber-based hardening composition according to  claim 1 , wherein the linear organopolysiloxane having comprising a vinyl group (A) is represented by formula (1): 
       
         
           
           
               
               
           
         
       
       wherein, in formula (1):
 m denotes an integer from 1 to 1,000; 
 n denotes an integer from 3,000 to 10,000; 
 R 1  denotes an alkyl group, alkenyl group, aryl group, which comprises 1 to 10 carbon atoms, and has a substituted group or no substituted group, or a hydrocarbon group in which these groups are combined; 
 R 2  denotes an alkyl group, alkenyl group, aryl group, which comprises 1 to 10 carbon atoms, and has a substituted group or no substituted group, or a hydrocarbon group in which these groups are combined; 
 R 3  denotes an alkyl group, aryl group, which comprises 1 to 8 carbon atoms, and has a substituted group or no substituted group, or a hydrocarbon group in which these groups are combined; and 
 at least one of plural R 1  and R 2  is an alkenyl group. 
 
     
     
         4 : The silicone rubber-based hardening composition according to  claim 1 , wherein the linear organohydrogen polysiloxane (B) is represented by formula (2): 
       
         
           
           
               
               
           
         
       
       wherein, in formula (2):
 m denotes an integer from 0 to 300; 
 n denotes an integer represented by (300−m); 
 R 4  denotes an alkyl group, alkenyl group, aryl group, which comprises 1 to 10 carbon atoms, and has a substituted group or no substituted group, a hydrocarbon group in which these groups are combined, or a hydride group; 
 R 5  denotes an alkyl group, alkenyl group, aryl group, which comprises 1 to 10 carbon atoms, and has a substituted group or no substituted group, a hydrocarbon group in which these groups are combined, or a hydride group; 
 at least two of plural R 4  and R 5  are a hydride group; and 
 R 6  denotes an alkyl group, aryl group, which comprises 1 to 8 carbon atoms, and has a substituted group or no substituted group, or a hydrocarbon group in which these groups are combined. 
 
     
     
         5 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silane coupling agent comprising a trimethylsilyl group is at least one selected from the group consisting of silazane, chlorosilane, and alkoxysilane. 
     
     
         6 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silane coupling agent comprising a trimethylsilyl group is at least one selected from the group consisting of hexamethyldisilazane, trimethylchlorosilane, trimethylmethoxysilane, and trimethylethoxysilane. 
     
     
         7 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silica filler (C) of which the surface is treated with a silane coupling agent comprising a trimethylsilyl group comprises carbon in a range of 0.1% to 7.0% by weight. 
     
     
         8 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silica filler (C) of which the surface is treated with a silane coupling agent comprising a trimethylsilyl group has a specific surface area in a range of 30 to 500 m 2 /g, and an average primary particle diameter of 100 nm or less. 
     
     
         9 : The silicone rubber-based hardening composition according to  claim 2 , wherein the silane coupling agent comprising an organosilyl group comprising a vinyl group is at least one selected from the group consisting of silazane, chlorosilane, and alkoxysilane. 
     
     
         10 : The silicone rubber-based hardening composition according to  claim 2 , wherein the silane coupling agent having an organosilyl group comprising a vinyl group is at least one selected from the group consisting of methacryloxypropyl triethoxysilane, methacryloxypropyl trimethoxysilane, methacryloxypropyl methyldiethoxysilane, methacryloxypropyl methyldimethoxysilane, divinyl tetramethyldisilane, vinyltriethoxysilane, vinyltrimethoxysilane, and vinylmethyldimethoxysilane. 
     
     
         11 : The silicone rubber-based hardening composition according to  claim 2 , wherein the silica filler (D) of which the surface is treated with a silane coupling agent comprising an organosilyl group comprising a vinyl group has a specific surface area in a range of 30 to 500 m 2 /g, and an average primary particle diameter of 100 nm or less. 
     
     
         12 : The silicone rubber-based hardening composition according to  claim 1 , wherein the linear organopolysiloxane comprising a vinyl group (A) comprises:
 a first linear organopolysiloxane comprising a vinyl group (A1) comprising 0.05% to 0.2% by mole of a vinyl group; and   a second linear organopolysiloxane comprising a vinyl group (A2) comprising 0.5% to 12% by mole of a vinyl group.   
     
     
         13 : The silicone rubber-based hardening composition according to  claim 1 , wherein the polymerization degree of the linear organopolysiloxane comprising a vinyl group (A) is in a range of 4,000 to 8,000. 
     
     
         14 : The silicone rubber-based hardening composition according to  claim 1 , wherein the linear organohydrogen polysiloxane (B) does not comprise a vinyl group. 
     
     
         15 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silicone rubber-based hardening composition comprises 0.1 to 5 parts by weight of the linear organohydrogen polysiloxane (B), and 20 to 150 parts by weight of the silica filler (C) of which the surface is treated with a silane coupling agent comprising a trimethylsilyl group, relative to 100 parts by weight of the linear organopolysiloxane comprising a vinyl group (A). 
     
     
         16 : The silicone rubber-based hardening composition according to  claim 2 , wherein the silicone rubber-based hardening composition comprises 0.1 to 5 parts by weight of the linear organohydrogen polysiloxane (B), 20 to 150 parts by weight of the silica filler (C) of which the surface is treated with a silane coupling agent comprising a trimethylsilyl group, and 0.5 to 100 parts by weight of the silica filler (D) of which the surface is treated with a silane coupling agent comprising an organosilyl group comprising a vinyl group, relative to 100 parts by weight of the linear organopolysiloxane comprising a vinyl group (A). 
     
     
         17 : The silicone rubber-based hardening composition according to  claim 1 , wherein the silicone rubber-based hardening composition further comprises a catalyst quantity of platinum or a platinum compound. 
     
     
         18 : A molded article, obtained by molding the silicone rubber-based hardening composition according to  claim 1 . 
     
     
         19 : A medical tube, comprising the molded article according to  claim 18 .