# US 9,040,641 B2 · Polycarbonate-polysiloxane copolymer, and method for preparing same

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- Number: US 9,040,641 B2
- Document ID: US9040641B2
- Status: Granted
- Kind: B2
- Application number: 13/927,232
- Filed: 2013-06-26
- Published: 2013-10-31
- Granted: 2015-05-26
- Earliest claimed: 2010-12-30
- Assignees: Cheil Industries Inc.
- Applicants: Cheil Industries Inc.
- Inventors: Jin Yong Bae; Mie Ock Kim
- Web page: https://patentgrep.com/patent/US9040641B2

## CPC

- C08G 77/38: Polysiloxanes modified by chemical after-treatment
- C08G 64/186: {containing polysiloxane sequences}
- C08G 77/448: containing polycarbonate sequences
- C08K 3/32: Phosphorus-containing compounds
- C08K 5/13: Phenols; Phenolates
- C08G 77/14: containing silicon bound to oxygen-containing groups
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A polycarbonate-polysiloxane copolymer includes a polysiloxane unit. The polycarbonate-polysiloxane copolymer can have superior melt flowability and ductility while maintaining high transparency and low haze.

## Claims

### Claim 1

A polycarbonate-polysiloxane copolymer comprising a polysiloxane unit represented by Formula 1:
wherein:
R1 and R2 are the same or different and are each independently C1-C10 alkyl, C6-C18 aryl, halogenated C1-C10 alkyl, alkoxylated C1-C10 alkyl, halogenated C6-C18 aryl or alkoxylated C6-C18 aryl,
each X is the same or different and each is independently C6-C20 alkylene, and
n is an integer from 20 to 100.

### Claim 2 (depends on 1)

The polycarbonate-polysiloxane copolymer according to claim 1, wherein the polysiloxane unit is present in an amount about 0.1 to about 20.0% by weight, based on the total weight of the polycarbonate-polysiloxane copolymer.

### Claim 3 (depends on 1)

The polycarbonate-polysiloxane copolymer according to claim 1, wherein the polycarbonate-polysiloxane copolymer has a haze of about 8% or less and a transmittance of about 75% or more as measured at a thickness of 3 mm, a ⅛″ Izod impact strength of about 70 kgf·cm/cm or more as measured at room temperature by ASTM D256, and a ⅛″ Izod impact strength of about 55 kgf·cm/cm or more as measured at −30 ° C. by ASTM D256.

### Claim 4 (depends on 1)

The polycarbonate-polysiloxane copolymer according to claim 1, wherein each X in Formula 1 is independently C8-C20 alkylene.

### Claim 5 (depends on 1)

The polycarbonate-polysiloxane copolymer according to claim 1, wherein each X in Formula 1 is independently C12-C20alkylene.

### Claim 6 (depends on 1)

The polycarbonate-polysiloxane copolymer according to claim 1, wherein the polycarbonate-polysiloxane copolymer has a tensile strength retention of about 88.0% to about 99.0% after measuring changes in tensile strength of an ASTM No.1 dumb-bell specimen after dipping in gasoline for 7 days.

### Claim 7 (depends on 6)

The polycarbonate-polysiloxane copolymer according to claim 6, wherein the polycarbonate-polysiloxane copolymer has a ⅛″ Izod impact strength of 59.9 kg·cm/cm or more as measured at −30 ° C. by ASTM D256.

### Claim 8

A method for preparing a polycarbonate-polysiloxane copolymer, comprising adding an aromatic dihydroxy compound and phosgene to a polysiloxane represented by Formula 2:
wherein:
R1 and R2 are the same or different and are each independently C1-C10 alkyl, C6-C18 aryl, halogenated C1-C10 alkyl, alkoxylated C1-C10 alkyl, halogenated C6-C18 aryl, or alkoxylated C6-C18 aryl,
each X is the same or different and each is independently C6-C20 alkylene or C6-C18 arylene, and
n is an integer from 20 to 100, and
polymerizing the mixture.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the aromatic dihydroxy compound is added in an amount of about 80.0 to about 99.9 parts by weight with respect to about 0.1 to about 20.0 parts by weight of the polysiloxane.

### Claim 10 (depends on 8)

The method according to claim 8, wherein the aromatic dihydroxy compound and the phosgene are added in two divided portions.

### Claim 11 (depends on 8)

The method according to claim 8, wherein each X in Formula 2 is independently C6-C20 alkylene.

### Claim 12 (depends on 8)

The method according to claim 8, wherein each X in Formula 2 is independently C8-C20 alkylene.

### Claim 13 (depends on 8)

The method according to claim 8, wherein each X in Formula 2 is independently C12-C20 alkylene.