# US 11,898,003 B2 · Polyester resin, coating agent, adhesive, resin composition, ink, and method for producing polyester resin

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- Number: US 11,898,003 B2
- Document ID: US11898003B2
- Status: Granted
- Kind: B2
- Application number: 17/319,324
- Filed: 2021-05-13
- Published: 2021-08-26
- Granted: 2024-02-13
- Earliest claimed: 2018-11-30
- Assignees: Mitsubishi Chemical Corporation
- Applicants: Mitsubishi Chemical Corporation
- Inventors: Yuka Tachibana; Tadahiro Ozawa; Asako Kaneko
- Web page: https://patentgrep.com/patent/US11898003B2

## CPC

- C08G 63/137: Acids or hydroxy compounds containing cycloaliphatic rings
- C08G 63/127: Acids containing aromatic rings
- C08G 63/183: Terephthalic acids
- C08G 63/20: Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
- C08G 63/83: Alkali metals, alkaline earth metals, beryllium, magnesium, copper, silver, gold, zinc, cadmium, mercury, manganese, or compounds thereof {(C08G63/823 takes precedence)}
- C08G 63/85: Germanium, tin, lead, arsenic, antimony, bismuth, titanium, zirconium, hafnium, vanadium, niobium, tantalum, or compounds thereof {(C08G63/823 takes precedence)}
- C08G 63/87: Non-metals or inter-compounds thereof (boron C08G63/84)
- C09D 11/104: Polyesters
- C09D 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09D167/06 takes precedence)
- C09J 167/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09J167/06 takes precedence)
- G03G 9/08755: {Polyesters}
- C08G 2150/00: Compositions for coatings
- C08G 2170/00: Compositions for adhesives
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A polyester resin has excellent adhesiveness and excellent grindability. The polyester resin includes a constitutional unit A derived from a carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups, a constitutional unit derived from a dicarboxylic acid, and a constitutional unit derived from a polyhydric alcohol. The constitutional unit A has a content of 0.01 parts by mole or more and 45 parts by mole or less with respect to 100 parts by mole of the constitutional unit derived from a dicarboxylic acid. The hydroxyl value of the polyester resin is 6 mgKOH/g or more and 27 mgKOH/g or less.

## Claims

### Claim 1

A polyester resin comprising:
a constitutional unit A derived from a carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups;
a constitutional unit derived from a dicarboxylic acid; and
a constitutional unit derived from a polyhydric alcohol,
wherein
the constitutional unit A has a content of 0.01 parts by mole or more and 5 parts by mole or less with respect to 100 parts by mole of the constitutional unit derived from a dicarboxylic acid,
the carboxylic acid having a cyclic structure and containing 5 or more carboxyl groups is at least one selected from the group consisting of benzenepentacarboxylic acid, cyclohexanehexacarboxylic acid and mellitic acid,
the acid value of the polyester resin is 0.1 mgKOH/a or more and 0.8 mgKOH/a or less, and
the hydroxyl value of the polyester resin is 6 mgKOH/g or more and 27 mgKOH/g or less.

### Claim 2 (depends on 1)

The polyester resin according to claim 1, wherein the polyester resin has a weight average molecular weight (Mw) of 10000 or more, as measured by GPC.

### Claim 3 (depends on 1)

The polyester resin according to claim 1, wherein the polyester resin has a color b value of 2 or less, as measured by spectrophotometric colorimetry.

### Claim 4 (depends on 1)

The polyester resin according to claim 1,
wherein the polyester resin has a color b value of 2 or less, as measured by spectrophotometric colorimetry.

### Claim 5 (depends on 1)

A coating agent comprising:
the polyester resin according to claim 1.

### Claim 6 (depends on 1)

An adhesive comprising:
the polyester resin according to claim 1.

### Claim 7 (depends on 1)

A resin composition comprising:
a polyester resin according to claim 1; and
a pigment.

### Claim 8 (depends on 7)

An ink comprising:
the resin composition according to claim 7.

### Claim 9 (depends on 1)

The polyester resin according to claim 1, wherein the polyester resin has a color b value of 2 or less, and a color L value of 59 to 65, as measured by spectrophotometric colorimetry.