Resin composition for direct vapor deposition, molded articles made by using the same, and surface-metallized lamp housing

Abstract

The direct vapor depositing resin composition of the present invention comprises at least one selected from the group consisting of (A-I): a graft copolymer obtained by graft-polymerizing one or more monomers or a monomer mixture to a complex rubber-like polymer (G) composed of a polyorganosiloxane and a (meth)acrylate-based polymer and (A-II): a graft copolymer obtained by graft-polymerizing one or more monomers or a monomer mixture including an alkyl(meth)acrylate as an essential component to a rubber-like polymer (R) in which the content of diene units is 30% by weight or less in 100% by weight of the whole rubber-like polymer. The direct vapor depositing resin composition of the present invention can provide a beautiful bright appearance after direct vapor deposition of a metal, further, has high level mechanical strengths such as impact strength and the like, and weather resistance, and is also excellent in hot plate welding property with a transparent resin such as PMMA resins, PC resins and the like.

What is claimed is:  
     
         1 . A direct vapor depositing resin composition comprising at least one selected from the group consisting of the following graft copolymers (A-I) and (A-II). 
 (A-I): A graft copolymer obtained by graft-polymerizing one or more monomers or a monomer mixture to a complex rubber-like polymer (G) composed of a polyorganosiloxane and a (meth)acrylate-based polymer.    (A-II): A graft copolymer obtained by graft-polymerizing one or more monomers or a monomer mixture including an alkyl(meth)acrylate as an essential component to a rubber-like polymer (R) in which the content of diene units is 30% by weight or less (including 0% by weight) in 100% by weight of the whole rubber-like polymer.    
     
     
         2 . The direct vapor depositing resin composition according to  claim 1  wherein the composition comprises a vinyl-based (co)polymer (B) having as a constituent unit at least one selected from the group consisting of aromatic alkenyl units, vinyl cyanide units and alkyl (meth)acrylate units.  
     
     
         3 . The direct vapor depositing resin composition according to  claim 2  wherein the total content of said graft copolymers (A-I) and (A-II) is from 5 to 95% by weight based on the total amount of the graft copolymers (A-I) and (A-II) and the vinyl-based (co)polymer (B), and the content of the vinyl-based (co)polymer (B) is from 95 to 5% by weight based on the total amount of the graft copolymers (A-I) and (A-II) and the vinyl-based (co)polymer (B).  
     
     
         4 . The direct vapor depositing resin composition according to any of  claims 1  to  3  wherein the composition comprises a polycarbonate and/or polyester (C).  
     
     
         5 . The direct vapor depositing resin composition according to  claim 4  wherein the total content of said graft copolymers (A-I) and (A-II) is from 5 to 80% by weight based on the total amount of the graft copolymers (A-I) and (A-II), vinyl-based (co)polymer (B) and polycarbonate and/or polyester (C), the content of said vinyl-based (co)polymer (B) is from 75 to 0% by weight based on the total amount of the graft copolymers (A-I) and (A-II), vinyl-based (co)polymer (B) and polycarbonate and/or polyester (C), and the content of said polycarbonate and/or polyester (C) is from 95 to 20% by weight based on the total amount of the graft copolymers (A-I) and (A-II), vinyl-based (co)polymer (B) and polycarbonate and/or polyester (C).  
     
     
         6 . The direct vapor depositing resin composition according to any of  claims 1  to  5  wherein the composition comprises said graft copolymer (A-I) and, in this graft copolymer (A-I), the ratio of rubber-like polymers having a particle size of 500 nm or more is less than 4% by weight, in all rubber-like polymers including a complex rubber-like polymer (G).  
     
     
         7 . The direct vapor depositing resin composition according to any of  claims 1  to  6  wherein the composition comprises said graft copolymer (A-I) and, in this graft copolymer (A-I), the content of a polyorganosiloxane in a complex rubber-like polymer (G) is from 1 to 99% by weight based on the total amount of a polyorganosiloxane and a (meth)acrylate-based polymer.  
     
     
         8 . The direct vapor depositing resin composition according to any of  claims 1  to  7  wherein the composition comprises said graft copolymer (A-I) and this graft copolymer (A-I) is a graft copolymer obtained by graft-polymerizing one or more monomers or a monomer mixture to a complex rubber-like polymer (G) composed of a (meth)acrylate-based polymer and a polyorganosiloxane in which the content of silicon atoms having three or more siloxane bonds is 1 mol % or less (including 0 mol %) based on all silicon atoms in polydimethylsiloxane.  
     
     
         9 . The direct vapor depositing resin composition according to any of  claims 1  to  8  wherein the composition comprises said graft copolymer (A-II) and, in this graft copolymer (A-II), the rubber-like polymer (R) contains as a constituent unit at least one of alkyl acrylate units having an alkyl group containing 2 to 8 carbon atoms.  
     
     
         10 . The direct vapor depositing resin composition according to any of  claims 1  to  8  wherein the composition comprises said graft copolymer (A-II) and, in this graft copolymer (A-II), said one or more monomers or a monomer mixture containing an alkyl(meth)acrylate as an essential component to be graft-polymerized to the rubber-like polymer (R) contains an alkyl(meth)acrylate in an amount of 50 to 100% by weight.  
     
     
         11 . A molded article obtained by molding the direct vapor depositing resin composition according to any of  claims 1  to  10 .  
     
     
         12 . A molded article according to  claim 11  wherein its surface is metallized by direct vapor deposition.  
     
     
         13 . A lamp housing obtained by metallization by direct vapor deposition of the surface of a molded article obtained by molding the direct vapor depositing resin composition according to any of  claims 1  to  10 .