Composition and cured layer

Abstract

The present invention provides a composition and a cured layer. The composition comprises 100 parts by weight of a first monomer, 1 to 10 parts by weight of a second monomer, 10 to 30 parts by weight of a polyurethane acrylate, and 15 to 35 parts by weight of a blocked isocyanate, wherein the first monomer is a monoacrylate compound, a monomethacrylate compound, a vinyl aromatic compound, an oxetane compound, maleic anhydride, dicyclopentadiene, N-vinylpyrrolidone, N-vinylformamide, or a combination thereof; and the second monomer is an alcohol compound having at least two reactive functional groups, wherein the reactive functional groups are acrylate groups or methacrylate groups.

Description

Technical Field

[0001] This invention relates to a composition and a cured layer formed therefrom. Background Technology

[0002] In the formation of etch resists, solder resists, and markings on printed circuit boards, the traditional method involves applying a high-viscosity ink composition to the substrate using screen printing. In recent years, to replace screen printing, a method has been developed to spray the ink composition onto the substrate using inkjet printing. Inkjet printing is characterized by reduced ink consumption and the ability to directly depict digital data. However, the properties of the compositions used in inkjet printing (IJP) differ from those conventionally used in screen printing.

[0003] Furthermore, in recent years, the miniaturization and thinning of electronic devices such as mobile phones, cameras, and laptops have been developing. In circuit board processes represented by semiconductor packaging substrates, flexible printed circuits (FPCs), or rigid-flexible (RF) substrates, the ink composition used, after inkjet printing, must not only have high adhesion to the substrate, solderability, and chemical resistance, but also be flexural strength to prevent the cured layer from cracking due to bending of the substrate and losing its protective effect.

[0004] Currently, photocurable inkjet compositions applicable to inkjet printing processes are mainly used for rigid boards. The materials are epoxy and phenolic resin derivatives, which are brittle and not resistant to bending after curing.

[0005] Therefore, a novel curable composition is needed to address the problems faced by conventional technologies. Summary of the Invention

[0006] According to embodiments of the present invention, the present invention provides a composition, for example, a curable composition suitable for inkjet printing (IJP) processes. According to embodiments of the present invention, the composition comprises 100 parts by weight of a first monomer, 1 to 10 parts by weight of a second monomer, 10 to 30 parts by weight of a polyurethane acrylate, and 15 to 35 parts by weight of a blocked isocyanate, wherein the first monomer is a monoacrylate compound, a monomethacrylate compound, a vinyl aromatic compound, an oxetane compound, maleic anhydride, dicyclopentadiene, N-vinylpyrrolidone, N-vinylformamide, or a combination thereof; and the second monomer is an alcohol compound having at least two reactive functional groups, wherein the reactive functional groups are acrylate groups or methacrylate groups.

[0007] According to embodiments of the present invention, the present invention also provides a cured layer, wherein the cured layer is a cured product of the composition described in the present invention. Detailed Implementation

[0008] The following provides a detailed description of the composition and cured layer described in this invention. It should be understood that the following description provides many different embodiments for implementing different variations of the invention. The specific components and arrangements described below are merely illustrative of the invention. Of course, these are only examples and not limitations of the invention. In this invention, the term "about" means an amount that can be increased or decreased by a size that is generally and reasonably understood by those skilled in the art.

[0009] The use of ordinal numbers such as "first," "second," "third," etc., in the specification and claims to modify the components of the claims does not imply or represent any prior ordinal number of the claimed component, nor does it represent the order of one claimed component with another, or the order of manufacturing methods. The use of these ordinal numbers is only to enable a claimed component with a certain name to be clearly distinguished from another claimed component with the same name.

[0010] The specific embodiments described are merely to illustrate particular ways in which the invention is used and are not intended to limit the invention. Unless otherwise defined, all terms used in this invention (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary knowledge in the art to which this invention pertains. It will be further understood that terms defined in common dictionaries should be interpreted as having the same meaning as they have in the relevant art and in the content of this invention, and that, unless explicitly defined herein, they will not be interpreted in an idealized or overly formal sense.

[0011] This invention provides a composition, such as a photosensitive curable composition, which can be used to form a patterned film layer using inkjet printing (IJP) and then a cured layer through an exposure process. By introducing specific reactive monomers and combining them with specific components and proportions, the composition of this invention achieves a viscosity between 18 cps and 34 cps at 25°C, making it highly suitable for forming patterned film layers using inkjet printing (IJP) and exhibiting excellent storage stability (viscosity increase of less than or equal to 1% after 30 days of storage at 60°C). Furthermore, the cured layer prepared using the composition of this invention maintains high chemical resistance, solderability, and adhesion while also possessing excellent folding resistance, making it highly suitable for use in printed circuit boards.

[0012] According to embodiments of the present invention, the present invention provides a composition. According to embodiments of the present invention, the composition comprises 100 parts by weight of a first monomer, 1 to 10 parts by weight (e.g., 1.5 parts by weight, 2 parts by weight, 3 parts by weight, 5 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, or 9 parts by weight) of a second monomer, 10 to 30 parts by weight (e.g., 12 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, or 28 parts by weight) of a polyurethane acrylate, and 15 to 35 parts by weight (e.g., 17 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, or 33 parts by weight) of a blocked isocyanate. According to embodiments of the present invention, when the amount of the second monomer is too small, the cured layer prepared by the composition has low chemical resistance, solderability, and adhesion; and when the amount of the second monomer is too large, the cured layer prepared by the composition has high viscosity and is unsuitable for forming patterned film layers using inkjet printing (IJP) processes. According to embodiments of the present invention, when the amount of polyurethane acrylate is too small, the resulting film layer has poor folding resistance; and when the amount of polyurethane acrylate is too large, the viscosity of the composition will be too high, which is not conducive to inkjet printing. According to embodiments of the present invention, when the amount of blocked isocyanate compound is too small, the resulting film layer has poor adhesion and solder resist properties; and when the amount of blocked isocyanate compound is too large, the viscosity of the composition will be too high, which is not conducive to inkjet printing.

[0013] According to embodiments of the present invention, the first monomer may be a monoacrylate compound, a monomethacrylate compound, a vinyl aromatic compound, an oxetane compound, maleic anhydride, dicyclopentadiene, N-vinylpyrrolidone, N-vinylformamide, or a combination thereof.

[0014] According to embodiments of the present invention, the monoacrylate compound may be methyl acrylate, ethyl acrylate, butyl acrylate, stearyl acrylate, acrylmorpholine, 2-hydroxy-3-acryloxypropyl acrylate, 2-hydroxy-3-phenoxyethyl acrylate, 1,4-cyclohexane dimethanol monoacrylate, methoxypolyethylene glycol monoacrylate, alkoxylated lauryl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, or stearyl acrylate. acrylate), isodecyl acrylate, 2-phenoxyethyl acrylate, 3,3-acrylate5-Trimethylcyclohexyl acrylate, isobornyl acrylate, tridecyl acrylate, ethoxylated nonyl phenol acrylate, octyldecyl acrylate, cyclic trimethylolpropane formal acrylate, hydroxyethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, ethylhexyl acrylate, or combinations thereof.

[0015] According to embodiments of the present invention, the monomethacrylate compound may be methyl methacrylate, ethyl methacrylate, butyl methacrylate, stearyl methacrylate, methacryloyl morpholine, 2-hydroxy-3-methacryloxypropyl methacrylate, 2-hydroxy-3-phenoxyethyl methacrylate, 1,4-cyclohexane dimethanol monomethacrylate, methoxypolyethylene glycol monomethacrylate, alkoxylated lauryl methacrylate, tetrahydrofuran methacrylate, or lauryl methacrylate. methacrylate), 2-(2-ethoxyethoxy)ethyl methacrylate, stearyl methacrylate, isodecyl methacrylate, 2-phenoxyethyl methacrylate, 3,3-methacrylate5-Trimethylcyclohexyl methacrylate, isobornyl methacrylate, tridecyl methacrylate, ethoxylated nonyl phenolmethacrylate, octyldecyl methacrylate, cyclic trimethylolpropane formal methacrylate, hydroxyethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, ethylhexyl methacrylate, or combinations thereof.

[0016] According to embodiments of the present invention, the vinyl aromatic compound may be styrene, methylstyrene, chloromethylstyrene, ethylstyrene, cyclohexylstyrene, divinylbenzene, 1-vinyl-5-hexylnaphthalene, vinylnaphthalene, vinylanthracene, or a combination thereof.

[0017] According to embodiments of the present invention, the oxetane compound may be xylylene oxetane, hydroxyoxetane, 3-ethyl-3-(phenoxymethyl)oxetane, or a combination thereof.

[0018] According to embodiments of the present invention, the first monomer is liquid at room temperature (e.g., about 18°C ​​to 35°C), and the second monomer, polyurethane acrylate, and blocked isocyanate compound are soluble or dispersed in the first monomer. Therefore, the composition of the present invention has fluidity at room temperature (e.g., about 18°C ​​to 35°C).

[0019] According to embodiments of the present invention, the second monomer may be an alcohol compound having at least two reactive functional groups, wherein the reactive functional groups may be acrylate groups or methacrylate groups. According to embodiments of the present invention, the alcohol compound having at least two reactive functional groups may be pentaerythritol diacrylate, pentaerythritol triacrylate (PETIA), dipentaerythritol tetraacrylate (DPPA), dipentaerythritol pentaacrylate (DPPA), 3-(acryloyloxy)-2-hydroxypropylmethacrylate, 2-ethyl-2-(hydroxymethyl)-1,3-propanediyl bismethacrylate, or a combination thereof.

[0020] According to embodiments of the present invention, the polyurethane acrylate may be an aromatic polyurethane acrylate, an aliphatic polyurethane acrylate, or a combination thereof. According to embodiments of the present invention, the polyurethane acrylate may be an aliphatic polyurethane diacrylate, an aliphatic polyurethane triacrylate, an aliphatic polyurethane hexaacrylate, an aromatic polyurethane diacrylate, an aromatic polyurethane hexaacrylate, an aliphatic polyurethane dimethacrylate, an aliphatic polyurethane trimethacrylate, an aliphatic polyurethane hexamethacrylate, an aromatic polyurethane dimethacrylate, an aromatic polyurethane hexamethacrylate, or a combination thereof.

[0021] According to embodiments of the present invention, the blocked isocyanate compound can be a reaction product of an isocyanate compound multimer and a capping agent. In other words, the blocked isocyanate compound can be an isocyanate compound multimer with a protecting group. According to embodiments of the present invention, the blocked isocyanate compound is obtained by capping an isocyanate multimer having a biuret structure, a tricyclic isocyanate structure, or an adduct structure using a capping agent. Furthermore, the blocked isocyanate compound of the present invention can be heated (e.g., 90°C to 150°C) to generate isocyanate groups.

[0022] The isocyanate compound used to synthesize blocked isocyanate compounds has two or more isocyanate groups in one molecule. For example, isocyanate compounds can be 2,4-toluenediisocyanate, 2,6-toluene diisocyanate, isophorone diisocyanate, 1,6-hexamethylene diisocyanate, 1,3-trimethylene diisocyanate, 1,4-tetramethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, and 1,9-nonamethylene diisocyanate. diisocyanate, 1,10-decamethylenediisocyanate, 1,4-cyclohexane diisocyanate, 2,2'-diethyl ether diisocyanate, diphenylmethane-4,4'-diisocyanate, o-xylylenediisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate diisocyanate), methylenebis(cyclohexylisocyanate), 1,3-cyclohexanedimethylenediisocyanate, 1,4-cyclohexanedimethylenediisocyanate, 1,5-naphthalenediisocyanate5-naphthalene diisocyanate, p-phenylene diisocyanate, 3,3'-methylenebis(o-tolyl diisocyanate), 4,4'-diphenylether diisocyanate, tetrachlorophenylene diisocyanate, norbornane diisocyanate, hydrogenated 1,3-xylylene diisocyanate, or hydrogenated 1,4-xylylene diisocyanate.

[0023] According to embodiments of the present invention, the capping agent forming the capping structure of the blocked isocyanate compound of the present invention may be an oxime compound, a lactam compound, a phenol compound, an alcohol compound, an amine compound, an active methylene compound, a pyrazole compound, a thiol compound, an imidazole-based compound, or an imide-based compound. For example, the oxime compound may be acetone oxime, formaldoxime, cyclohexane oxime, methyl ethyl ketone oxime, cyclohexanone oxime, benzophenone oxime, or acetone oxime; the lactam compound may be ε-caprolactam or γ-butyrolactam; the phenol compound may be phenol, naphthol, cresol, or xylenol; the alcohol compound may be methanol, ethanol, propanol, butanol, cyclohexanol, ethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, or alkyl lactate; the amine compound may be aniline, diphenylamine, ethyleneimine, or polyethyleneimine; the active methylene compound may be diethyl malonate, dimethyl malonate, ethyl acetoacetate, or methyl acetoacetate; the pyrazole compound may be pyrazole, methylpyrazole, or dimethylpyrazole; and the thiol compound may be alkyl thiol or aryl thiol.

[0024] According to embodiments of the present invention, the composition may further comprise 0.1 to 20 parts by weight (e.g., 0.5 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 10 parts by weight, or 15 parts by weight) of an initiator, such as a photoinitiator. The photoinitiator may be a benzoin-based compound, an acetophenone-based compound, a thioxanthone-based compound, a ketal compound, a benzophenone-based compound, an α-aminoacetophenone compound, an acylphosphine oxide compound, a biimidazole-based compound, a triazine-based compound, or a combination thereof.

[0025] According to embodiments of the present invention, the acetophenone compounds may be photoinitiators manufactured by Ciba Geigy and with trade numbers Irgacure 2959, Irgacure 184, Irgacure 500, Irgacure 651, Irgacure 369, Irgacure 379, Irgacure 907, or Darocur 1173. According to embodiments of the present invention, the initiator may be a photoinitiator with trade numbers IRGACURE 819, IRGACURE 1800, Lucirin TPO, or Lucirin TPO-L. According to embodiments of the present invention, the initiator described herein may also be a photoinitiator manufactured by LAMBSON with trade numbers Esacure1001M, Esacure KIP150, Speedcure BEM, Speedcure EHA, Speedcure BMS, Speedcure MBP, Speedcure PBZ, Speedcure ITX, Speedcure DETX, Speedcure EBD, Speedcure MBB, or Speedcure BP, or a photoinitiator manufactured by Ciba Geigy with trade numbers Irgacure 2100, Irgacure250, or Irgacure 784.

[0026] According to embodiments of the present invention, the composition comprises a first monomer, a second monomer, an acrylic polyurethane, a blocked isocyanate compound, and an initiator. According to embodiments of the present invention, the composition may consist of a first monomer, a second monomer, an acrylic polyurethane, a blocked isocyanate compound, and an initiator.

[0027] According to embodiments of the present invention, the composition of the present invention may further comprise 0.1 to 10 parts by weight (e.g., 0.5 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, or 8 parts by weight) of a photoacid generating agent. The photoacid generating agent of the present invention may be an onium salt, a triarylsulfonium salt, an alkylarylsulfonium salt, a diaryliodonium salt, a diarylchloronium salt, a diarylbromonium salt, a sulfonate salt, a diazonium salt, a diazonaphthoquinone sulfonate, or a combination thereof.

[0028] According to embodiments of the present invention, the composition of the present invention comprises a first monomer, a second monomer, an acrylic polyurethane, a blocked isocyanate compound, an initiator, and a photoacid generator. According to embodiments of the present invention, the composition of the present invention may consist of a first monomer, a second monomer, an acrylic polyurethane, a blocked isocyanate compound, an initiator, and a photoacid generator.

[0029] According to embodiments of the present invention, the present invention may further comprise 0.1 to 40 parts by weight (e.g., 1 part by weight, 5 parts by weight, 8 parts by weight, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, 30 parts by weight, or 35 parts by weight) of an additive. According to embodiments of the present invention, the additive may be a known additive for curable compositions (e.g., curable compositions applicable to printed circuit board processes), such as leveling agents, fillers, colorants (e.g., white pigments, black pigments, green pigments, red pigments, blue pigments, or yellow pigments), dyes, defoamers, flame retardants, viscosity modifiers, thixotropic agents, dispersants, stabilizers, or combinations thereof.

[0030] According to embodiments of the present invention, a cured layer is also provided, wherein the cured layer is a cured product of the composition described herein. According to embodiments of the present invention, the method for preparing the cured layer may include forming a patterned layer on a substrate using an inkjet printing (IJP) process to form the composition described herein. Subsequently, the patterned layer is subjected to an exposure process, and a baking process is performed as needed to obtain the cured layer. According to embodiments of the present invention, the light source for the exposure process may be ultraviolet (UV) light (wavelength may be 150 nm to 400 nm), and the exposure dose may be 50 mJ / cm². 2 Up to 200mj / cm 2 (e.g., 70mj / cm) 2 100mj / cm 2 120mj / cm 2 150mj / cm 2 or 180mj / cm 2 ).

[0031] To make the above-mentioned and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below.

[0032] Curable Composition

[0033] Example 1

[0034] 50 g of 4-acryloylmorpholine (ACMO), 15 g of 2-hydroxyethyl acrylate (2-HEA), 15 g of tetrahydrofurfuryl acrylate (THFA), and 8 g of diphenyl2,4,6-trimethylbenzoyl)phosphine oxide (TPO) (as a photoinitiator) were uniformly mixed to obtain a mixture. Next, 2 grams of pentaerythritol triacrylate (trade name: Tianjian 4334), 20 grams of aliphatic polyurethane diacrylate (trade name: GU3010Z, manufactured by Guojing Chemical), 14 grams of isophorone diisocyanate (IPDI) trimer (with 3,5-dimethylpyrazole (DMP) as the end-capping agent (trade name: BI7951, manufactured by Anfeng Industrial Co., Ltd.), and 9 grams of white titanium dioxide (TiO2) (trade name: RFDO) (average particle size approximately 220 to 300 nm) were added to the mixture in sequence. After thorough mixing, the resulting material was filtered through a 1 μm filter to obtain a curable composition (1).

[0035] Example 2

[0036] Example 2 was prepared according to the method of preparing curable composition (1) described in Example 1, except that the amount of pentaerythritol triacrylate was increased from 2 grams to 4 grams, the amount of aliphatic polyurethane diacrylate was reduced from 20 grams to 18 grams, and the amount of isophorone diisocyanate trimer was increased from 14 grams to 16 grams, to obtain curable composition (2).

[0037] Example 3

[0038] Example 3 was prepared according to the method of preparing curable composition (1) described in Example 1, except that the amount of pentaerythritol triacrylate was increased from 2 grams to 4 grams, the amount of aliphatic polyurethane diacrylate was reduced from 20 grams to 15 grams, and the amount of isophorone diisocyanate trimer was increased from 14 grams to 19 grams, to obtain curable composition (3).

[0039] Example 4

[0040] Example 4 was prepared according to the method of preparing curable composition (1) described in Example 1, except that the amount of pentaerythritol triacrylate was increased from 2 grams to 4 grams, the amount of aliphatic polyurethane diacrylate was reduced from 20 grams to 10 grams, and the amount of isophorone diisocyanate trimer was increased from 14 grams to 24 grams, to obtain curable composition (4).

[0041] Comparative Example 1

[0042] 83 g of 1,6-hexanediol diacrylate (trade name SR238NS) and 8 g of diphenyl2,4,6-trimethylbenzoyl phosphine oxide (TPO) (as a photoinitiator) were uniformly mixed to obtain a mixture. Next, 18 g of bisphenol A diglycidyl ether (trade name Epon828), 4 g of pentaerythritol triacrylate (trade name Tianjian 4334), 12 g of isophorone diisocyanate (IPDI) trimer (trade name BI7951, manufactured by Anfeng Industrial Co., Ltd.), and 9 g of white titanium dioxide (TiO2) (trade name RFDO) (average particle size approximately 220 to 300 nm) were added to the mixture in sequence. After mixing evenly, the resulting material is filtered through a 1μm filter element to obtain a curable composition (5).

[0043] Comparative Example 2

[0044] Comparative Example 2 was prepared according to the method for preparing the curable composition (5) described in Comparative Example 1, except that bisphenol A diglycidyl ether (Epon828) was replaced with 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (trade name DOUBLEMER 421P, manufactured by Double Bond Chemical Co., Ltd.), the amount of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) was reduced from 8 grams to 6 grams, and 2 grams of photoacid generator (trade name: (Manufactured by San-Apro Corporation), resulting in a curable composition (6).

[0045] Comparative Example 3

[0046] Comparative Example 3 was prepared according to the method for preparing the curable composition (5) described in Comparative Example 1, except that the amount of bisphenol A diglycidyl ether (Epon828) was reduced from 18 grams to 9 grams, 9 grams of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (trade name DOUBLEMER 421P, manufactured by Double Bond Chemical Co., Ltd.) was added, the amount of diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) was reduced from 8 grams to 7 grams, and 2 grams of photoacid generator (trade name: (Manufactured by San-Apro Corporation), resulting in a curable composition (7).

[0047] Comparative Example 4

[0048] 83 g of 1,6-hexanediol diacrylate (trade name SR238NS), 3 g of 2-hydroxyethyl acrylate (2-HEA), 4 g of tetrahydrofurfuryl acrylate (THFA), and 8 g of diphenyl2,4,6-trimethylbenzoyl phosphine oxide (TPO) (as a photoinitiator) were uniformly mixed to obtain a mixture. Next, 38 g of aliphatic polyurethane diacrylate (trade name GU3010Z, manufactured by Guojing Chemical), 4 g of pentaerythritol triacrylate (trade name Tianjian 4334), and 9 g of white titanium dioxide (TiO2) (trade name RFDO) (average particle size approximately 220 to 300 nm) were sequentially added to the mixture. After mixing thoroughly, the resulting material was filtered through a 1 μm filter element to obtain a curable composition (8).

[0049] Comparative Example 5

[0050] Comparative Example 5 was prepared according to the method for preparing the curable composition (8) described in Comparative Example 4, except that 38 grams of aliphatic polyurethane diacrylate was replaced with isophorone diisocyanate (IPDI) trimer (trade name BI7951, manufactured by Anfeng Industrial Co., Ltd.) to obtain curable composition (9).

[0051] Comparative Example 6

[0052] Comparative Example 6 was prepared according to the method for preparing the curable composition (5) described in Comparative Example 1, except that the amount of 1,6-hexanediol diacrylate was increased from 83 g to 94 g and isophorone diisocyanate trimer was not added, resulting in a curable composition (10).

[0053] Next, the viscosity of curable compositions (1) to (10) at 25°C was measured, and the storage stability of curable compositions (1) to (10) was evaluated. The results are shown in Table 1. The storage stability was evaluated as follows: First, the viscosity (V1) of the curable composition at 25°C was measured. Then, the viscosity (V2) of the curable composition was measured again after being placed at 60°C for 30 days, and the viscosity increase (V2-V1) of the curable composition was calculated. After being stored at 60°C for 30 days, if the viscosity increase was less than or equal to 2 cps, it was recorded as O; if the viscosity increase was greater than 2 cps and less than or equal to 10 cps, it was recorded as △; and if the viscosity increase was greater than 10 cps or the composition had no flowability, it was recorded as X. The viscosity was measured using a high shear rate viscometer (CAP2000 H, Brookfield).

[0054] Table 1

[0055]

[0056]

[0057] As shown in Table 1, by using specific composition and proportion, the curable composition of the present invention has a room temperature viscosity of less than or equal to 33 cps, and after being stored at 60°C for 30 days, the viscosity increase is less than or equal to 2 cps (less than or equal to 1%), thus exhibiting excellent storage stability.

[0058] Solidified products and property assessment

[0059] Pattern layers (15±1μm thick) of curable compositions (1) to (10) were formed on copper foil substrates with a polyimide (PI) coating (size 10cm*10cm) using inkjet printing (IJP) process (printer model KM1020, manufactured by Kyocera). The pattern layers were then exposed using ultraviolet light with a wavelength of 395nm and baked at 150°C to obtain cured layers (1) to (10) disposed on the polyimide coating. The chemical resistance, solderability (at 288°C), folding resistance, and adhesion of the cured layers (1) to (10) were then evaluated, and the results are shown in Table 2. The chemical resistance is evaluated as follows: The cured layer (along with the copper foil substrate) is cut into test pieces (10mm × 100mm), and immersed in sulfuric acid aqueous solution (10wt%) and sodium hydroxide aqueous solution (10wt%) respectively, while stirring at 25°C. After 20 minutes, the cured layer is removed and observed. If the surface of the cured layer is undamaged, it is recorded as O; if the surface of the cured layer is slightly damaged, it is recorded as △; and if the cured layer is significantly swollen or peels off from the copper foil substrate, it is recorded as X. The solderability is evaluated as follows: The cured layer (along with the copper foil substrate) is cut into test pieces (10mm × 100mm) and placed in a solder bath at 288°C. After 10 minutes, the cured layer is removed and observed. If the surface of the cured layer is undamaged, it is recorded as O; if the surface of the cured layer is slightly damaged, it is recorded as △; and if the cured layer is significantly swollen or peels off from the copper foil substrate, it is recorded as X. The flexural strength was assessed as follows: The cured layer (along with the copper foil substrate) was cut into test pieces (10mm × 100mm) and bent from the center of the test piece with a radius of curvature of 1.0mm (bending angle 180°, load 1 kg, and 3 bends). If the cured layer showed no breakage, it was recorded as O; if the cured layer had minor cracks or damage, it was recorded as △; and if the cured layer fractured over a large area or peeled off from the copper foil substrate, it was recorded as X. Adhesion was assessed using the cross-cut adhesion test (according to ASTM D3359).

[0060] In addition, a patterned layer (15±1μm thick) was formed on a paper phenolic laminate (FR-1, size 10cm*10cm) using inkjet printing (IJP) process (printer model KM1020, manufactured by Kyocera). The patterned layer was then exposed to ultraviolet light (wavelength 395nm) and baked at 150°C to obtain cured layers (11) to (20) disposed on the phenolic resin. The adhesion of the cured layers (11) to (20) was then evaluated, and the results are shown in Table 2.

[0061] Table 2

[0062]

[0063]

[0064]

[0065] As shown in Table 2, the cured layer obtained by using the curable composition of the present invention with specific composition and proportion has good chemical resistance, solderability and adhesion, as well as 180-degree flexural strength, making it suitable for forming patterned layers on flexible / bendable substrates using inkjet printing.

[0066] In summary, by introducing specific reactive monomers and combining them with specific components and proportions, the composition of this invention exhibits a viscosity between 18 cps and 34 cps at 25°C, making it highly suitable for forming patterned films using inkjet printing (IJP) processes. It also demonstrates excellent storage stability (viscosity increase of less than or equal to 1% after 30 days of storage at 60°C). Furthermore, the cured layer prepared using the composition of this invention maintains high chemical resistance, solderability, and adhesion while also possessing excellent folding resistance, making it ideal for use in printed circuit boards.

[0067] Although the present invention has been disclosed above with reference to several embodiments, it is not intended to limit the present invention. Anyone with common knowledge in the art can make any modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A composition comprising: 100 parts by weight of a first monomer, wherein the first monomer is a monoacrylate compound, a monomethacrylate compound, a vinyl aromatic compound, an oxetane compound, maleic anhydride, dicyclopentadiene N-vinylpyrrolidone, N-vinylformamide, or a combination thereof. 1 to 10 parts by weight of a second monomer, wherein the second monomer is an alcohol compound having at least two reactive functional groups, wherein the reactive functional groups are acrylate groups or methacrylate groups; 10 to 30 parts by weight of polyurethane acrylate; and 15 to 35 parts by weight of a blocked isocyanate compound.

2. The composition according to claim 1, wherein the viscosity of the composition at 25°C is 18 cps to 34 cps.

3. The composition according to claim 1, wherein the monoacrylate compound is methyl acrylate, ethyl acrylate, butyl acrylate, stearyl acrylate, acrylmorpholine, 2-hydroxy-3-acryloyloxypropyl acrylate, 2-hydroxy-3-phenoxyethyl acrylate, 1,4-cyclohexanediol monoacrylate, methoxyvinyl alcohol monoacrylate, alkyl oxyacrylate lauryl acrylate, tetrahydrofuran acrylate, lauryl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, octadecyl acrylate, isodecanyl acrylate, 2-phenoxyethyl acrylate, 3,3,5-trimethylcyclohexyl acrylate, isobornyl acrylate, tridecyl acrylate, ethoxylated nonylphenol acrylate, octyldecyl acrylate, cyclotrimethylolpropane methyl acetal acrylate, hydroxyethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, isooctyl acrylate, or a combination thereof.

4. The composition according to claim 1, wherein the monomethacrylate compound is methyl methacrylate, ethyl methacrylate, butyl methacrylate, stearate methacrylate, methacrylmorpholine, 2-hydroxy-3-methacryloyloxypropyl methacrylate, 2-hydroxy-3-phenoxyethyl methacrylate, 1,4-cyclohexanediethanol monomethacrylate, methoxyvinyl alcohol monomethacrylate, alkyloxymethyl methacrylate lauryl ester, tetrahydrofuran methacrylate, lauryl methacrylate, 2-(2-ethoxyethoxy)ethyl methacrylate, octadecyl methacrylate, isodecanyl methacrylate, 2-phenoxyethyl methacrylate, 3,3,5-trimethylcyclohexyl methacrylate, isobornyl methacrylate, tridecyl methacrylate, ethoxynonylphenol methacrylate, octyldecyl methacrylate, cyclotrimethylolpropane methyl acetal methacrylate, hydroxyethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, isooctyl methacrylate, or a combination thereof.

5. The composition according to claim 1, wherein the vinyl aromatic compound is styrene, methylstyrene, chloromethylstyrene, ethylstyrene, cyclohexylstyrene, ethylene biphenyl, 1-ethylene-5-hexylnaphthalene, ethylene naphthalene, ethylene anthracene, or a combination thereof.

6. The composition according to claim 1, wherein the oxetane compound is xylene dioxetane, oxetane alcohol, 3-ethyl-3-(phenoxymethyl)oxetane, or a combination thereof.

7. The composition according to claim 1, wherein the alcohol compound having at least two reactive functional groups is pentaerythritol diacrylate, pentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, 3-(acryloyloxy)-2-hydroxypropyl acrylate, 2-ethyl-2-(hydroxymethyl)-1,3-propanediyl dimethacrylate, or a combination thereof.

8. The composition according to claim 1, wherein the polyurethane acrylate is an aromatic polyurethane acrylate, an aliphatic polyurethane acrylate, or a combination thereof.

9. The composition according to claim 1, wherein the blocked isocyanate compound is a reaction product of a polymer of an isocyanate compound and a capping agent.

10. The composition according to claim 1, further comprising: 1-20 parts by weight of initiator.

11. A cured layer, wherein the cured layer is a cured product of the composition according to any one of claims 1 to 10.

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