JP-7857286-B2 - Coating resin composition, polymer, method for producing polymer, coating film, and method for producing the same.

Inventors

• 弘中 幸治
• 小川 泰輝
• 上平 茂生

Assignees

• 富士フイルム株式会社

Dates

Publication Date

20260512

Application Date

20220427

Priority Date

20210514

Claims (11)

1. The polymer comprises a structural unit represented by the following formula (I), a structural unit represented by the following formula (II), and an end structure represented by the following formula (III-A) or (III-B). A coating resin composition wherein the polymer contains 10% by mass or more of the structural unit represented by formula (I) and 10% by mass or more of the structural unit represented by formula (II). In the formula, Me represents methyl. In the formulas, Ra and Rb represent monovalent organic groups. In formula (III-A), Ra is bonded to the oxygen atom shown in formula (III-A) by the carbon atom in Ra , and in formula (III-B), Rb is bonded to the carbonyl group shown in formula (III-B) by the carbon atom in Rb . * indicates a bonding site.
2. The coating resin composition according to claim 1, wherein the polymer contains 20% by mass or more of the structural unit represented by formula (I).
3. The coating resin composition according to claim 1 or 2, wherein the polymer contains 20% by mass or more of the structural unit represented by formula ( II).
4. The coating resin composition according to claim 1 or 2, wherein the end structure represented by formula (III-A) in the polymer is represented by the following formula (III-A-1). In the formula, R d represents an alkyl group, an aryl group, or a halogen atom, and s is an integer from 0 to 5. * indicates a bonding site.
5. A coating resin composition according to claim 1 or 2, comprising a solvent.
6. A coating resin composition according to claim 1 or 2, comprising a functional material consisting of an aromatic ring compound containing a benzene ring, wherein the mass ratio of the polymer content to the functional material content is polymer/functional material = 90:10 to 50:50.
7. A polymer having a structural unit represented by the following formula (I), a structural unit represented by the following formula (II), and an end structure represented by the following formula (III-A) or (III-B), A polymer in which the structural unit represented by formula (I) is present in an amount of 10% by mass or more, and the structural unit represented by formula (II) is present in an amount of 10% by mass or more. In the formula, Me represents methyl. In the formulas, Ra and Rb represent monovalent organic groups. In formula (III-A), Ra is bonded to the oxygen atom shown in formula (III-A) by the carbon atom in Ra , and in formula (III-B), Rb is bonded to the carbonyl group shown in formula (III-B) by the carbon atom in Rb . * indicates a bonding site.
8. A method for producing a polymer having a structural unit represented by the following formula (II), comprising the step of mixing a mixture containing an alkaline aqueous solution of a divalent phenol and an organic solvent with solid 4,4'-biphenyldicarbonyl chloride.
9. The method for producing the polymer according to claim 8, wherein the polymer is the polymer described in claim 7.
10. A coating film comprising the polymer described in claim 7.
11. A method for forming a coating film, comprising coating a substrate with the coating resin composition described in claim 1 or 2.

Description

This invention relates to a resin composition for coating, a polymer, a method for producing a polymer, a coating film, and a method for producing the same. Polyesters containing structural units derived from aromatic diol compounds and aromatic dicarboxylic acid compounds, and polycarbonates containing structural units derived from aromatic diol compounds and phosgene, are excellent in terms of heat resistance and mechanical strength, and are widely used industrially. For example, Patent Document 1 describes a film-forming resin mainly composed of a polyester comprising residues of divalent carboxylic acids having biphenyl, diphenyl ether, and cyclohexane structures, and residues of divalent phenols. It states that by controlling the amount of free divalent carboxylic acids to 0.01 to 300 ppm, the electrical properties can be stabilized when applied to capacitors, electrophotographic photoreceptors, etc. Furthermore, Patent Document 2 describes a resin composition comprising 100 parts by mass of a polymer resin composition in which 95 to 5% by mass of a polyarylate component (A) and 5 to 95% by mass of a polycarbonate component (B) are combined to make 100% by mass, and 0.01 to 1 part by mass of a silicone compound (C) having a glycidyl group of a specific structure. According to Patent Document 2, molded articles using this composition possess both heat resistance and transparency, and are suitable for automotive lamp peripheral parts, lighting fixture reflectors, and the like. Japanese Patent Publication No. 2008-31347Japanese Patent Publication No. 2003-292756 In the description of this invention, the numerical range represented by "~" means a range that includes the numbers written before and after "~" as the lower limit and upper limit, respectively. In the description of this invention, substituents, linking groups, etc. (hereinafter referred to as "substituents, etc.") that are not explicitly stated as substituted or unsubstituted are considered to have appropriate substituents. Therefore, even when simply referred to as "~group" (e.g., "alkyl group") in this specification, this "~group" (e.g., "alkyl group") includes not only the unsubstituted form (e.g., "unsubstituted alkyl group") but also the form having a substituent (e.g., "substituted alkyl group"). The same applies to compounds that are not explicitly stated as substituted or unsubstituted. Preferred substituents include those selected from substituent T described below. In the description of the present invention, when there are multiple substituents, or when multiple substituents are specified simultaneously or alternatively, it means that each substituent may be the same as or different from the others. Furthermore, even if not specifically stated otherwise, when multiple substituents are adjacent to each other, they may be linked to each other or fused to form a ring. In this specification, if a polymer has multiple components of the same designation (designated by the same general formula), each component may be identical or different from the others. [Coating resin composition] The coating resin composition of the present invention comprises a polymer having a structural unit represented by the following formula (I), a structural unit represented by the following formula (II), and an end structure represented by formula (III-A) or (III-B). This polymer may hereafter be simply referred to as "the above polymer." In the formula, Me represents methyl. In formula (I), the substituent to the right of Me, which is bonded to the carbon atom to which Me is attached, is isobutyl. In the above polymer, the content of the structural unit represented by formula (I) is 10% by mass or more, preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and particularly preferably 50% by mass or more. Furthermore, the content of the structural unit represented by formula (I) in the above polymer is usually 70% by mass or less, and preferably 65% by mass or less. In the above polymer, the content of the structural unit represented by formula (II) is 10% by mass or more, preferably 20% by mass or more, more preferably 25% by mass or more, even more preferably 30% by mass or more, and particularly preferably 40% by mass or more. Furthermore, the content of the structural unit represented by formula (II) in the above polymer is usually 60% by mass or less, and preferably 50% by mass or less. By setting the content of the structural units represented by formula (I) and formula (II) in the polymer within the above range, the polymer can be made to possess both rigidity and appropriate flexibility, thereby further enhancing the abrasion resistance of the coating film. Furthermore, when functional materials are used in combination, the compatibility between the functional materials and the polymer can be improved, ensuring the desired film-forming properties more reliably. In the formulas, Ra and Rb represent