# US 11,441,030 B2 · Resin composition and film formed from same

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- Number: US 11,441,030 B2
- Document ID: US11441030B2
- Status: Granted
- Kind: B2
- Application number: 15/763,282
- Filed: 2016-09-21
- Published: 2018-10-04
- Granted: 2022-09-13
- Earliest claimed: 2015-10-02
- Assignees: Teijin Limited
- Applicants: Teijin Limited
- Inventors: Kenta Imazato; Shoichi Maekawa; Katsuhiro Yamanaka
- Web page: https://patentgrep.com/patent/US11441030B2

## CPC

- C08L 69/00: Compositions of polycarbonates; Compositions of derivatives of polycarbonates
- C08G 64/02: Aliphatic polycarbonates
- C08G 64/0208: {saturated}
- C08G 64/305: {and alcohols}
- C08J 5/18: Manufacture of films or sheets
- C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L 33/12: Homopolymers or copolymers of methyl methacrylate
- C08J 2333/12: Homopolymers or copolymers of methyl methacrylate
- C08J 2369/00: Characterised by the use of polycarbonates; Derivatives of polycarbonates
- C08J 2433/12: Homopolymers or copolymers of methyl methacrylate
- C08J 2469/00: Characterised by the use of polycarbonates; Derivatives of polycarbonates
- C08L 2203/16: used for films
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

Provided is a resin composition comprising: a polycarbonate resin (A) containing, as main repeating units, a unit (a-1) represented by the following formula (a-1) and a unit (a-2) represented by the following formula (a-2) (wherein, W represents a C1-20 alkylene group or a C6-20 cycloalkylene group, R represents a branched or linear-chain C1-20 alkyl group or a C6-20 cycloalkyl group optionally substituted, and m represents an integer of 0 to 10) and an acrylic resin (B), and the polycarbonate resin and the acrylic resin are in a weight ratio of 40:60 to 99:1, wherein the resin composition has a single glass transition temperature, which is in the range of 90° C. to 150° C., and the resin composition has excellent transparency, chemical resistance, surface hardness and heat resistance, and has a low photoelastic coefficient.

## Claims

### Claim 1

A resin composition consisting of:
a polycarbonate resin (A) containing, as main repeating units, a unit (a-1) represented by the following formula (a-1)
and a unit (a-2) represented by the following formula (a-2)
wherein W represents a C1-20 alkylene group or a C6-20 cycloalkylene group, R represents a branched or linear-chain C1-20 alkyl group or a C6-20 cycloalkyl group optionally substituted, and
m represents an integer of 0 to 10; and
an acrylic resin (B) containing as monomer components, 50 to 99 mol % of methyl methacrylate and 1 to 50 mol % of methyl acrylate,
wherein the polycarbonate resin (A) and the acrylic resin (B) are in a weight ratio of 50:50 to 90:10,
wherein the resin composition has a single glass transition temperature, and the glass transition temperature is in the range of 90° C. to 150° C.,
wherein the polycarbonate resin (A) has a molar ratio (a-1/a-2) of the unit (a-1) to the unit (a-2) of 40/60 to 85/15,
wherein the polycarbonate (A) has a specific viscosity (ηSP) of 0.3 to 1.5,
wherein the resin composition is produced by a step consisting of melt mixing the polycarbonate resin (A) and the acrylic resin (B) in a twin-screw extruder, and
wherein the resin composition has a total light transmittance of 85% or more.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein the composition has a surface hardness of F or higher.

### Claim 3 (depends on 1)

The resin composition according to claim 1, wherein the composition has a photoelastic coefficient of 25×10−12 Pa−1 or less.

### Claim 4 (depends on 1)

The resin composition according to claim 1, wherein the acrylic resin is a thermoplastic acrylic resin which complies with JIS K7210 and has a melt flow rate, measured at 230° C. and a load of 3.8 kg, of 0.5 to 30 g/10 min.

### Claim 5 (depends on 1)

The resin composition according to claim 1, wherein the unit (a-2) of the polycarbonate resin (A) is a unit derived from 3,9-bis(2-hydroxy-1,1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5.5]undecane.

### Claim 6 (depends on 1)

A film formed from the resin composition according to claim 1.

### Claim 7 (depends on 1)

A method of producing the resin composition according to claim 1, consisting of melt mixing the polycarbonate resin (A) and the acrylic resin (B) in a twin-screw extruder.