US2014018498A1PendingUtilityA1

Polycarbonate resin composition, method for producing same and molded article of this resin composition

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Assignee: HITOMI TATSUYAPriority: Mar 31, 2010Filed: Sep 12, 2013Published: Jan 16, 2014
Est. expiryMar 31, 2030(~3.7 yrs left)· nominal 20-yr term from priority
Inventors:Tatsuya HitomiRyouhei NishiharaMasanori YamamotoMichio NakataTetsurou NobuyasuRyuuji UchimuraKazuyuki TakahashiKenji TsuruharaTomonari Yokoyama
C08K 3/016C08K 3/32B29B 9/12B29K 2995/002C08L 69/00B29K 2995/0089B29C 48/022B29C 45/0001B29L 2007/008B29B 7/46B29K 2995/007B29C 48/08B29K 2995/0046C08K 5/42B29K 2105/0094B29K 2995/0088C08L 2205/02B32B 27/365B29K 2069/00B32B 5/145C08K 5/02B29L 2007/002B29K 2105/0067B29B 9/06
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Claims

Abstract

To provide a polycarbonate resin composition excellent in the surface hardness, the heat resistance, the moldability and the flame retardancy. A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements: (i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184; (ii) the glass transition point Tg(a) of the polycarbonate resin (a) and the glass transition point Tg(b) of the polycarbonate resin (b) satisfy the relation of the following (Formula 1): Tg ( b )−45° C.< Tg ( a )< Tg ( b )−10° C.  (Formula 1) (iii) the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is higher by at least two ranks than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184.

Claims

exact text as granted — not AI-modified
1 . A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements:
 (i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184; and   (ii) the ratio of the intrinsic viscosity [η](a) of the polycarbonate resin (a) to the intrinsic viscosity [η](b) of the polycarbonate resin (b), [η](a)/[η](b), is at least 0.1 and at most 0.65.   
     
     
         2 . The polycarbonate resin composition according to  claim 1 , wherein the ratio of the viscosity average molecular weight Mv(a) of the polycarbonate resin (a) to the viscosity average molecular weight Mv(b) of the polycarbonate resin (b), Mv(a)/Mv(b), is at least 0.1 and at most 2.0 
     
     
         3 . The polycarbonate resin composition according to  claim 1 , wherein the weight ratio of the polycarbonate resin (a) to the polycarbonate resin (b) in the polycarbonate resin composition is within a range of from 1:99 to 45:55. 
     
     
         4 . The polycarbonate resin composition according to  claim 1 , wherein the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is at least F. 
     
     
         5 . The polycarbonate resin composition according to  claim 1 , wherein the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is at least HB. 
     
     
         6 . The polycarbonate resin composition according to  claim 1 , wherein the above Tg(a) and Tg(b) satisfy the relation of the following (Formula 2):
     Tg ( b )−30° C.< Tg ( a )< Tg ( b )−15° C.  (Formula 2)
   
     
     
         7 . The polycarbonate resin composition according to  claim 1 , wherein the polycarbonate resin (a) is a polycarbonate resin having at least structural units derived from a compound represented by the following formula (1): 
       
         
           
           
               
               
           
         
         wherein each of R 1  and R 2  which are independent of each other, is a substituted or non-substituted C 1-20  alkyl group or a substituted or non-substituted aryl group, each of R 3  and R 4  which are independent of each other, is a hydrogen atom, a substituted or non-substituted C 1-20  alkyl group or a substituted or non-substituted aryl group, and X is a single bond, a carbonyl group, a substituted or non-substituted alkylidene group, an oxidized or non-oxidized sulfur atom, or an oxygen atom. 
       
     
     
         8 . The polycarbonate resin composition according to  claim 1 , wherein the polycarbonate resin (a) is a polycarbonate resin having at least structural units derived from at least one compound selected from the group consisting of the following formulae (1a) to (1c): 
       
         
           
           
               
               
           
         
       
     
     
         9 . The polycarbonate resin composition according to  claim 1 , wherein the polycarbonate resin (b) is a polycarbonate resin having mainly structural units derived from a compound represented by the following formula (2): 
       
         
           
           
               
               
           
         
       
     
     
         10 . The polycarbonate resin composition according to  claim 1 , which has a yellowness index (YI) of at most 4.0. 
     
     
         11 . The polycarbonate resin composition according to  claim 1 , which further contains a flame retardant. 
     
     
         12 . An injection-molded article, which is obtained by injection-molding the polycarbonate resin composition as defined in  claim 1 . 
     
     
         13 . An extruded article, which is obtained by extruding the polycarbonate resin composition as defined in  claim 1 . 
     
     
         14 . The extruded article according to  claim 13 , which is a sheet or a film.

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