Rubber-reinforced styrene transparent resin composition

Abstract

A rubber-reinforced styrene transparent resin composition contains a styrene copolymer reinforced with a rubber polymer, wherein the monomer composition of an acetone soluble resin component contained in the resin composition contains 5 to 70% by weight of aromatic vinyl monomer (a1), 30 to 95% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 0 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 50% by weight of another monomer copolymerizable with these monomers, and the acid value of the acetone soluble resin component is 0.01 to 1 mgKOH/g.

What is claimed is:  
     
         1 . A rubber-reinforced styrene transparent resin composition comprising a styrene copolymer reinforced with a rubber polymer, wherein the monomer composition of an acetone soluble resin component contained in the resin composition comprises 5 to 70% by weight of aromatic vinyl monomer (a1), 30 to 95% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 0 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 50% by weight of another monomer copolymerizable with these monomers, and the acid value of the acetone soluble resin component is 0.01 to 1 mgKOH/g.  
     
     
         2 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , comprising 10 to 95 parts by weight of copolymer (A) obtained by copolymerizing a vinyl monomer mixture (a), and 90 to 5 parts by weight of graft copolymer (B) obtained by graft-polymerizing a vinyl monomer mixture (c) in the presence of a rubber polymer (b).  
     
     
         3 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein each of the vinyl monomer mixture (a) and the vinyl monomer mixture (c) has an acid value of less than 0.01 mgKOH.  
     
     
         4 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , wherein the total light transmittance is 50% or more.  
     
     
         5 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein the total light transmittance is 50% or more.  
     
     
         6 . A rubber-reinforced styrene transparent resin composition according to  claim 3 , wherein the total light transmittance is 50% or more.  
     
     
         7 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , wherein in the composition distribution of weight ratios (φ ST /φ MMA ) of the aromatic vinyl monomer (a1) and the unsaturated carboxylic acid alkyl ester monomer (a2), which constitute the acetone soluble resin component, 80% by weight or more of the acetone soluble resin component lies in the range of 0.75 to 1.2 times as large as the average weight ratio (φ ST /φ MMA ).  
     
     
         8 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein in the composition distribution of weight ratios (φ ST /φ MMA ) of the aromatic vinyl monomer (a1) and the unsaturated carboxylic acid alkyl ester monomer (a2), which constitute the acetone soluble resin component, 80% by weight or more of the acetone soluble resin component lies in the range of 0.75 to 1.2 times as large as the average weight ratio (φ ST /φ MMA ).  
     
     
         9 . A rubber-reinforced styrene transparent resin composition according to  claim 3 , wherein in the composition distribution of weight ratios (φ ST /φ MMA ) of the aromatic vinyl monomer (a1) and the unsaturated carboxylic acid alkyl ester monomer (a2), which constitute the acetone soluble resin component, 80% by weight or more of the acetone soluble resin component lies in the range of 0.75 to 1.2 times as large as the average weight ratio (φ ST /φ MMA ).  
     
     
         10 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , wherein the difference in refractive index between the rubber polymer and the acetone soluble resin component is 0.03 or less.  
     
     
         11 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein the difference in refractive index between the rubber polymer and the acetone soluble resin component is 0.03 or less.  
     
     
         12 . A rubber-reinforced styrene transparent resin composition according to  claim 3 , wherein the difference in refractive index between the rubber polymer and the acetone soluble resin component is 0.03 or less.  
     
     
         13 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 70% by weight of aromatic vinyl monomer (a1), 30 to 95% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 0 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 50% by weight of another monomer copolymerizable with these monomers, and containing substantially no unsaturated carboxylic acid monomer (except the unsaturated carboxylic acid alkyl ester monomer (a2)) (a5).  
     
     
         14 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 70% by weight of aromatic vinyl monomer (a1), 30 to 95% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 0 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 50% by weight of another monomer copolymerizable with these monomers, and containing substantially no unsaturated carboxylic acid monomer (except the unsaturated carboxylic acid alkyl ester monomer (a2)) (a5).  
     
     
         15 . A rubber-reinforced styrene transparent resin composition according to  claim 3 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 70% by weight of aromatic vinyl monomer (a1), 30 to 95% by weight of unsaturated carboxylic-acid alkyl ester monomer (a2), 0 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 50% by weight of another monomer copolymerizable with these monomers, and containing substantially no unsaturated carboxylic acid monomer (except the unsaturated carboxylic acid alkyl ester monomer (a2)) (a5).  
     
     
         16 . A rubber-reinforced styrene transparent resin composition according to  claim 1 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 40% by weight of aromatic vinyl monomer (a1), 30 to 80% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 10 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 40% by weight of another monomer copolymerizable with these monomers, and the ratio of a triple sequence of acrylonitrile monomer units present in the acetone soluble resin component of the resin composition is 10% by weight or less relative to the acetone soluble resin component.  
     
     
         17 . A rubber-reinforced styrene transparent resin composition according to  claim 2 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 40% by weight of aromatic vinyl monomer (a1), 30 to 80% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 10 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 40% by weight of another monomer copolymerizable with these monomers, and the ratio of a triple sequence of acrylonitrile monomer units present in the acetone soluble resin component of the resin composition is 10% by weight or less relative to the acetone soluble resin component.  
     
     
         18 . A rubber-reinforced styrene transparent resin composition according to  claim 3 , wherein each of the vinyl monomer mixtures (a) and (c) is a monomer mixture comprising 5 to 40% by weight of aromatic vinyl monomer (a1), 30 to 80% by weight of unsaturated carboxylic acid alkyl ester monomer (a2), 10 to 50% by weight of vinyl cyanide monomer (a3), and 0 to 40% by weight of another monomer copolymerizable with these monomers, and the ratio of a triple sequence of acrylonitrile monomer units present in the acetone soluble resin component of the resin composition is 10% by weight or less relative to the acetone soluble resin component.  
     
     
         19 . A rubber-reinforced styrene transparent resin composition according to  claim 16 , wherein the solubility parameter of the copolymer (A) is 10.5 to 12.5 (cal/ml) 1/2 .  
     
     
         20 . A rubber-reinforced styrene transparent resin composition according to  claim 17 , wherein the solubility parameter of the copolymer (A) is 10.5 to 12.5 (cal/ml) 1/2 .  
     
     
         21 . A rubber-reinforced styrene transparent resin composition according to  claim 18 , wherein the solubility parameter of the copolymer (A) is 10.5 to 12.5 (cal/ml) 1/2 .  
     
     
         22 . A rubber-reinforced styrene transparent resin composition comprising a resin composition obtained by mixing 90 to 5 parts by weight of graft copolymer (B), which is obtained by graft-polymerizing a vinyl monomer with a rubber polymer, with 10 to 95 parts by weight of copolymer (A) in a melt state in the step of continuous bulk polymerization or continuous solution polymerization of a vinyl monomer mixture (a), wherein in mixing the copolymer (A) and the graft copolymer (B), 0.1 to 30% by weight of pelletized thermoplastic resin (C) relative to the graft copolymer(B) is previously added to the graft copolymer (B) and mixed therewith in a melt or semi-melt state, and then mixed with the copolymer (A).  
     
     
         23 . A rubber-reinforced styrene transparent resin composition according to  claim 22 , wherein the pelletized thermoplastic resin (C) has an average particle diameter of 1 to 10 mm.