# US 8,541,506 B2 · Polycarbonate resin composition with excellent scratch resistance and impact strength

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,541,506 B2
- Document ID: US8541506B2
- Status: Granted
- Kind: B2
- Application number: 12/972,795
- Filed: 2010-12-20
- Published: 2011-06-30
- Granted: 2013-09-24
- Earliest claimed: 2009-12-30
- Assignees: Cheil Industries Inc.
- Applicants: Kee Hae Kwon; Jin Hwa Chung; Kwang Soo Park; Sang Ki Park; Il Jin Kim
- Inventors: Kee Hae Kwon; Jin Hwa Chung; Kwang Soo Park; Sang Ki Park; Il Jin Kim
- Web page: https://patentgrep.com/patent/US8541506B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08F 220/1806: {C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate}
- C08L 33/10: Homopolymers or copolymers of methacrylic acid esters
- C08F 220/1804: {C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate}
- C08F 220/1818: {C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate}
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- C08L 33/12: Homopolymers or copolymers of methyl methacrylate
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A polycarbonate resin composition according to the present invention comprises a polycarbonate resin and an ultra-high molecular weight branched acrylic copolymer resin and can have excellent transparency, appearance, and flowability, as well as scratch resistance and impact strength.

## Claims

### Claim 1

A polycarbonate resin composition comprising:
(A) about 50 to about 99 parts by weight of a polycarbonate resin; and
(B) about 1 to about 50 parts by weight of a ultra-high molecular weight branched acrylic copolymer resin,
wherein (B) the ultra-high molecular weight branched acrylic copolymer resin comprises a polymer or a combination of polymers prepared by polymerizing a monomer mixture comprising (b1) an aromatic methacrylate monomer, an alicyclic methacrylate monomer, or a combination thereof, (b2) a monomer copolymerizable with the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or the combination thereof comprising methyl methacrylate, ethyl methacrylate, propyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, monoglycerol acrylate, acrylic acid, methacrylic acid, maleic anhydride, or a combination thereof, (b3) a (meth)acrylic monomer having a flexible segment, and (b4) a monomer forming a branched structure; wherein (b3) the (meth)acrylic monomer having a flexible segment comprises a compound represented by the following Chemical Formula 5 or a combination thereof:
wherein m is an integer from 10 to 18, X is hydrocarbon, and Y is methyl or hydrogen.

### Claim 2 (depends on 1)

The polycarbonate resin composition of claim 1, further comprising (C) about 0 to about 50 parts by weight of a linear acrylic resin.

### Claim 3 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (B) the ultra-high molecular weight branched acrylic copolymer resin comprises a polymer or a combination of polymers prepared by polymerizing a monomer mixture comprising (b1) about 5 to about 99.8% by weight of an aromatic methacrylate monomer, an alicyclic methacrylate monomer, or a combination thereof, (b2) greater than 0 to about 94.5% by weight of the monomer copolymerizable with the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or the combination thereof, (b3) about 0.1 to about 40% by weight of a (meth)acrylic monomer having a flexible segment, and (b4) about 0.001 to about 10% by weight of a monomer forming a branched structure.

### Claim 4 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (B) the ultra-high molecular weight branched acrylic copolymer resin has a weight average molecular weight of about 100,000 to about 5,000,000.

### Claim 5 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (B) the ultra-high molecular weight branched acrylic copolymer resin has a refractive index of about 1.495 to about 1.570.

### Claim 6 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b1) the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or combination thereof and (b2) the monomer copolymerizable with the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or the combination thereof each have a refractive index of about 1.495 to about 1.570.

### Claim 7 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b1) the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or combination thereof are represented by the following Chemical Formula 2, Chemical Formula 3, or a combination thereof:
wherein m is an integer from 0 to 10 and X is cyclohexyl, phenyl, methylphenyl, methylethylphenyl, methoxyphenyl, cyclohexylphenyl, chlorophenyl, bromophenyl, phenylphenyl or benzylphenyl;
wherein m is an integer from 0 to 10, Y is oxygen (O) or sulfur (S), and Ar is cyclohexyl, phenyl, methylphenyl, methylethylphenyl, methoxyphenyl, cyclohexylphenyl, chlorophenyl, bromophenyl, phenylphenyl or benzylphenyl.

### Claim 8 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b1) the aromatic methacrylate monomer, the alicyclic methacrylate monomer, or combination thereof comprises cyclohexyl methacrylate, phenoxy methacrylate, phenoxy ethyl methacrylate, 2-ethylphenoxy methacrylate, 2-ethylthiophenyl methacrylate, 2-ethylaminophenyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-phenylethyl methacrylate, 3-phenylpropyl methacrylate, 4-phenylbutyl methacrylate, 2-2-methylphenylethyl methacrylate, 2-3-methylphenylethyl methacrylate, 2-4-methylphenylethyl methacrylate, 2-(4-propylphenyl)ethyl methacrylate, 2-(4-(1-methylethyl)phenyl)ethyl methacrylate, 2-(4-methoxyphenyl)ethyl methacrylate, 2-(4-cyclohexylphenyl)ethyl methacrylate, 2-(2-chlorophenyl)ethyl methacrylate, 2-(3-chlorophenyl)ethyl methacrylate, 2-(4-chlorophenyl)ethyl methacrylate, 2-(4-bromophenyl)ethyl methacrylate, 2-(3-phenylphenyl)ethyl methacrylate, 2-(4-benzylphenyl)ethyl methacrylate, or a combination thereof.

### Claim 9 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b3) the (meth)acrylic monomer having a flexible segment comprises both a compound represented by the following Chemical Formula 4 and a compound represented by the following Chemical Formula 5:
wherein m is an integer from 3 to 9, X is hydrocarbon, and Y is methyl or hydrogen;
wherein m is an integer from 10 to 18, X is hydrocarbon, and Y is methyl or hydrogen.

### Claim 10 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b3) the (meth)acrylic monomer having a flexible segment comprises stearyl (meth)acrylate, lauryl (meth)acrylate, or a combination thereof.

### Claim 11 (depends on 1)

The polycarbonate resin composition of claim 1, wherein (b4) the monomer forming a branched structure comprises a silane compound; a siloxane compound; an allyl compound; a (poly)alkylene glycol di(meth)acrylate compound; an aromatic monomer; a vinyl group-containing monomer; pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol penta(meth)acrylate, glycerol tri(meth)acrylate; or a combination thereof.

### Claim 12 (depends on 11)

The polycarbonate resin composition of claim 11, wherein the silane or siloxane compound includes an unsaturated hydrocarbon group-containing silicone-containing monomer; the allyl compound includes diallyl phthalate, diallylacrylamide, triallyl (iso)cyanurate, triallyl trimelitate, or a combination thereof; the(poly)alkylene glycol di(meth)acrylate compound includes 1,6-hexanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, (poly)tetramethylene glycol di(meth)acrylate, or a combination thereof; the aromatic monomer includes divinylbenzene; and the vinyl group-containing monomer includes 1,4-divinyloxybutane, divinylsulfone, or a combination thereof.

### Claim 13 (depends on 2)

The polycarbonate resin composition of claim 2, wherein (C) the linear acrylic resin has a weight average molecular weight of about 5,000 to about 300,000.

### Claim 14 (depends on 2)

The polycarbonate resin composition of claim 2, wherein (C) the linear acrylic resin is a homopolymer prepared using one kind of (meth)acrylic monomer, a copolymer prepared using two or more kinds of (meth)acrylic monomers, or a combination thereof, and (C) the linear acrylic resin has a linear structure.

### Claim 15 (depends on 14)

The polycarbonate resin composition of claim 14, wherein the (meth)acrylic monomer comprises methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, n-butyl methacrylate, phenyl methacrylate, benzyl methacryate, hexyl methacrylate, cyclohexyl methacrylate, phenoxy methacrylate, phenoxyethyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, or a combination thereof.

### Claim 16 (depends on 1)

The polycarbonate resin composition of claim 1, wherein the polycarbonate resin composition has a complex viscosity (η*) of about 10,000 to about 1,000,000 Pas at 240° C. under the frequency of 0.01 rad/s, and a ratio of η* (0.01 rad/s)/η* (100 rad/s) within the range of about 2.0 to about 10.0 at 240° C.

### Claim 17 (depends on 1)

The polycarbonate resin composition of claim 1, further comprising one or more additives selected from the group consisting of antibacterial agents, mold release agents, heat stabilizers, antioxidants, light stabilizers, compatibilizers, dyes, inorganic additives, surfactants, nucleating agents, coupling agents, fillers, plasticizers, reinforcers, admixing agents, coloring agents, stabilizers, lubricants, antistatic agents, pigments, flame retardants, and combinations thereof.

### Claim 18 (depends on 1)

A molded article prepared from the polycarbonate resin composition of claim 1.