# US 8,784,963 B2 · Branched polycarbonate

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- Number: US 8,784,963 B2
- Document ID: US8784963B2
- Status: Granted
- Kind: B2
- Application number: 13/808,845
- Filed: 2011-07-05
- Published: 2013-05-30
- Granted: 2014-07-22
- Earliest claimed: 2010-07-08
- Assignees: Asahi Kasei Chemicals Corporation
- Applicants: Nobutsugu Namba; Yoko Hachiya
- Inventors: Nobutsugu Namba; Hiroshi Hachiya
- Web page: https://patentgrep.com/patent/US8784963B2

## CPC

- C08G 64/42: Chemical after-treatment
- B65D 1/0207: {characterised by material, e.g. composition, physical features}
- C08G 64/06: not containing aliphatic unsaturation
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1397: Single layer [continuous layer]
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A branched polycarbonate having a branching derived from a polyfunctional compound, comprising a repeating unit represented by general formula (1), a branched structure (a) derived from the polyfunctional compound and a branched structure (b) including at least one selected from the group consisting of branched structures represented by general formulas (2), (3) and (4), the total content of (a) and (b) with respect to (1) being 0.2-1.0 mol %, the ratio of (b) with respect to the total of (a) and (b) being 0.1-0.6, and the ratio of (2) with respect to the content of (b) being 0.5 or greater. [In formulas, Ar represents a divalent aromatic residue and Ar′ represents a trivalent aromatic residue.]

## Claims

### Claim 1

A branched polycarbonate having a branching derived from a polyfunctional compound having in the molecule at least 3 functional groups that are reactive with a carbonic acid diester,
the branched polycarbonate having a repeating unit represented by general formula (1) on the main chain and branched chains and
comprising a branched structure (a) derived from the polyfunctional compounds directly bonded to the main chain and branched chains and a branched structure (b) including at least one selected from the group consisting of branched structures represented by general formulas (2), (3) and (4), wherein:
the total amount of substance with branched structure (a) and branched structure (b) with respect to the amount of substance of the repeating unit represented by general formula (1) is 0.2-1.0 mol %,
the ratio of the amount of substance with branched structure (b) with respect to the total amount of substance with branched structure (a) and branched structure (b) is 0.1-0.6, and
the ratio of the amount of substance with the branched structure represented by general formula (2) with respect to the amount of substance with branched structure (b) is 0.5 or greater,
[In formulas (1), (2), (3) and (4), Ar represents a divalent aromatic residue and Ar′ represents a trivalent aromatic residue.]

### Claim 2 (depends on 1)

The branched polycarbonate according to claim 1, wherein the ratio of the amount of substance with the branched structure represented by formula (4) with respect to the amount of substance with branched structure (b) is no greater than 0.25.

### Claim 3 (depends on 1)

The branched polycarbonate according to claim 1, wherein the polyfunctional compound is a compound having at least 3 phenolic hydroxyl and/or carboxyl groups.

### Claim 4 (depends on 1)

The branched polycarbonate according to claim 1, wherein:
the polyfunctional compound is 1,1,1-tris(4-hydroxyphenyl)ethane and/or 4-[4-[1,1-bis(4-hydroxyphenyl)ethyl]-α,α-dimethylbenzyl]phenol, and
the branched structures represented by general formulas (2), (3) and (4) are the branched structures represented by formulas (5), (6) and (7), respectively.

### Claim 5 (depends on 1)

A container obtained by blow molding the branched polycarbonate according to claim 1.

### Claim 6 (depends on 5)

The container according to claim 5, wherein the value of the maximum thickness divided by the minimum thickness ranges from 1.0 or more to less than 2.0, the thickness are measured following the face parallel to the bottom face of the container.