# US 12,006,398 B2 · Polycarbonate resin

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- Number: US 12,006,398 B2
- Document ID: US12006398B2
- Status: Granted
- Kind: B2
- Application number: 17/598,531
- Filed: 2020-03-30
- Published: 2022-06-09
- Granted: 2024-06-11
- Earliest claimed: 2019-04-02
- Assignees: Mitsubishi Gas Chemical Company, Inc.
- Applicants: Mitsubishi Gas Chemical Company, Inc.
- Inventors: Shun Ishikawa; Noriyoshi Ogawa
- Web page: https://patentgrep.com/patent/US12006398B2

## CPC

- C08G 64/14: containing a chain-terminating or -crosslinking agent
- C08G 64/045: {containing aliphatic unsaturation}
- C08G 64/12: containing nitrogen
- C07D 249/20: with aryl radicals directly attached in position 2
- C08G 64/00: Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule (polycarbonate-amides C08G69/44; polycarbonate-imides C08G73/16)
- C08G 64/24: and phenols
- C08G 64/42: Chemical after-treatment
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

A terminally modified polycarbonate resin that has ultraviolet absorbing capability is provided. More specifically, the terminally modified polycarbonate resin has a structure represented by general formula (A) and a constituent unit that is derived from a dihydric phenol. (In general formula (A), R1 represents a hydrogen atom or an alkyl group having 1-6 carbon atoms; R2 represents an alkylene group having 1-6 carbon atoms; R3 represents a hydrogen atom or a methyl group; R4 represents a hydrogen atom or a halogen atom; and * represents the bonding position to the main chain of the polycarbonate resin.)

## Claims

### Claim 1

A terminally modified polycarbonate resin comprising a structure represented by General formula (A) and a structural unit derived from a dihydric phenol:
(in General formula (A) above, R1 represents a hydrogen atom or a C1-C6 alkyl group, R2 represents a C1-C6 alkylene group, R3 represents a hydrogen atom or a methyl group, R4 represents a hydrogen atom or a halogen atom, and * represents the position of the bond to the main chain of the polycarbonate resin).

### Claim 2 (depends on 1)

The terminally modified polycarbonate resin according to claim 1, wherein the viscosity-average molecular weight is 10,000-60,000.

### Claim 3 (depends on 1)

The terminally modified polycarbonate resin according to claim 1, comprising a structural unit represented by General formula (1) below which has an end group represented by General formula (A):
(wherein, R5-R8 each independently represent a hydrogen atom, a halogen atom, an optionally substituted C1-C20 alkyl group, an optionally substituted C1-C5 alkoxy group, an optionally substituted C6-C12 aryl group, an optionally substituted C7-C17 aralkyl group or an optionally substituted C2-C15 alkenyl group, and
X is —O—, —S—, —SO—, —SO2—, —CO— or a divalent group represented by any of General formulae (3) to (6) below:
(in General formulae (3) to (6), R9 and R10 each independently represent a hydrogen atom, a halogen atom, an optionally substituted C1-C20 alkyl group, an optionally substituted C1-C5 alkoxy group, an optionally substituted C6-C12 aryl group, an optionally substituted C7-C17 aralkyl group or an optionally substituted C2-C15 alkenyl group, or
R9 and R10 bind to each other to form a C3-C20 carbocyclic ring or a C1-C20 heterocyclic ring;
c represents an integer of 0-20;
R11 and R12 each independently represent a hydrogen atom, a halogen atom, an optionally substituted C1-C20 alkyl group, an optionally substituted C1-C5 alkoxy group, an optionally substituted C6-C12 aryl group, an optionally substituted C7-C17 aralkyl group or an optionally substituted C2-C15 alkenyl group, or
R11 and R12 bind to each other to form a C3-C20 carbocyclic ring or a C1-C20 heterocyclic ring;
R13-R16 each independently represent a hydrogen atom, a halogen atom, an optionally substituted C1-C20 alkyl group, an optionally substituted C1-C5 alkoxy group, an optionally substituted C6-C12 aryl group, an optionally substituted C7-C17 aralkyl group or an optionally substituted C2-C15 alkenyl group, or
R13 and R14, and R15 and R16 bind to each other to form a C3-C20 carbocyclic ring or a C1-C20 heterocyclic ring; and
R17-R26 each independently represent a hydrogen atom or a C1-C3 alkyl group, where at least one of R17-R26 is a C1-C3 alkyl group)).

### Claim 4 (depends on 3)

The terminally modified polycarbonate resin according to claim 3, wherein X is a divalent group represented by General formula (3).

### Claim 5 (depends on 4)

The terminally modified polycarbonate resin according to claim 4, wherein the dihydric phenol is a bisphenol compound.

### Claim 6 (depends on 5)

The terminally modified polycarbonate resin according to claim 5, wherein the bisphenol compound is selected from the group consisting of bisphenol A, bisphenol AP, bisphenol Z, bisphenol CD, bisphenol C, bisphenol IOTD, bisphenol IBTD and bisphenol MIBK.

### Claim 7 (depends on 3)

The terminally modified polycarbonate resin according to claim 3, wherein the end structure represented by General formula (A) above is represented by Formula (7) below:
(in General formula (7), * represents the position of the bond to the main chain of the polycarbonate resin).

### Claim 8 (depends on 1)

The polycarbonate resin according to claim 1, which contains the end structure represented by General formula (A) in an amount of 0.5% or more by mass relative to the structural unit derived from a dihydric phenol.

### Claim 9 (depends on 1)

The polycarbonate resin according to claim 1, wherein transmittance at 330 nm is 1% or less.