TW202134340A - Halogen-free low-dielectric composition, laminated substrate and printed circuit board therof - Google Patents

Abstract

The present invention provides a halogen-free low-dielectric composition, a laminated board and a printed circuit board, wherein the halogen-free low-dielectric composition (a) 100 parts by weight of epoxy resin; (b) 10 to 25 parts by weight of DOPO modification hardener; (c) 10 to 20 parts by weight of benzoxazine resin; (d) 100 to 120 parts by weight of active ester compound; (e) 10 to 20 parts by weight of maleic anhydride modification hardener And (f) 20 to 45 parts by weight of a non-DOPO flame retardant. The halogen-free low-dielectric composition of the present invention provides a halogen-free epoxy resin composition with a specific composition and proportion, and has high glass transition temperature, low dielectric constant, low dielectric loss, high Characteristics of heat resistance and high storage modulus.

Description

Halogen-free low-dielectric composition, laminate and printed circuit board

The invention relates to a low-dielectric composition, a laminated board and a printed circuit board, in particular to a halogen-free low-dielectric composition, a laminated board and a printed circuit board.

In the printed circuit board technology, the thermosetting resin composition mainly includes epoxy resin and hardener, which is heated and combined with the reinforcing material to form a prepreg, which is then pressed with the upper and lower copper foils at high temperature and high pressure Combined into a copper foil laminated board (or copper foil substrate). Generally, the thermosetting resin composition uses a phenol novolac resin hardener with a hydroxyl group (-OH). After it is combined with an epoxy resin, the epoxy group will open the ring to form a hydroxyl group, and the hydroxyl group will increase the dielectric constant and dielectric Loss value, and easy to _{bond with H 2} O, resulting in increased hygroscopicity. The prior art epoxy resin composition uses halogen-containing flame retardants (especially brominated flame retardants), such as tetrabromocyclohexane, hexabromocyclodecane and 2,4,6-tris(tribromobenzene) Oxy)-1,3,5-triazabenzene, etc., halogen-containing flame retardants have the advantages of good flame retardancy and less addition. However, with the rise of global environmental awareness, the EU has implemented RoHS environmental regulations , Enabling lead-free copper foil substrates and halogen-free environmentally friendly substrates to gradually replace traditional FR-4 substrates.

Therefore, how to develop materials with excellent dielectric properties and meet other characteristics of printed circuit boards, such as high glass transition temperature (Tg), low thermal expansion coefficient, and low water absorption, and apply them to high-frequency printed circuit boards The manufacturing of printed circuit board materials is a problem that the suppliers of printed circuit board materials urgently want to solve at this stage.

The technical problem to be solved by the present invention is to provide a halogen-free low-dielectric composition, a laminated board and a printed circuit board in view of the deficiencies of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a halogen-free low-dielectric composition, which includes: (a) 100 parts by weight of epoxy resin; (b) 10 to 25 parts by weight of DOPO modified hardener; (c) 10 to 20 parts by weight of benzoxazine resin; (d) 100 to 120 parts by weight of active ester compound; (e) 10 to 20 parts by weight of maleic anhydride modified hardener; and (f) 20 to 45 parts by weight of non-DOPO flame retardant.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a laminated board, which includes: a resin substrate, which includes a plurality of prepreg films, and each of the prepreg films is made of a glass fiber The cloth is made by coating the halogen-free low-dielectric composition of the present invention; and a metal foil layer disposed on at least one surface of the resin substrate.

In order to solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a printed circuit board, which includes the laminated board according to the present invention.

One of the beneficial effects of the present invention is that the halogen-free low-dielectric composition of the present invention can provide a halogen-free epoxy resin composition with a specific composition and ratio, and it has a high glass transition temperature and a low dielectric. The characteristics of electric constant, low dielectric loss, high heat resistance and high storage modulus. It can be made into semi-cured film or resin film to achieve the purpose of being applicable to copper foil substrates and printed circuit boards; in terms of industrial applicability, the products derived from the present invention can fully satisfy the current market need.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

The following are specific examples to illustrate the implementation of the “halogen-free low-dielectric composition, laminate and printed circuit board” disclosed in the present invention. Those skilled in the art can understand the present invention from the content disclosed in this specification. Advantages and effects. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be based on different viewpoints and applications, and various modifications and changes can be made without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another, or one signal from another signal. In addition, the term "or" used in this document may include any one or a combination of more of the associated listed items depending on the actual situation.

The first embodiment of the present invention provides a halogen-free low-dielectric composition, which includes: (a) 100 parts by weight of epoxy resin; (b) 10 to 25 parts by weight of DOPO modified hardener; (c) 10 to 20 parts by weight of benzoxazine resin; (d) 100 to 120 parts by weight of active ester compound; (e) 10 to 20 parts by weight of maleic anhydride modified hardener; and (f) 20 to 45 parts by weight of non-DOPO flame retardant.

In a specific embodiment of the present invention, the epoxy resin of the present invention is selected from the group consisting of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, phenol novolac epoxy resin, Cresol novolac epoxy resin, bisphenol A novolac epoxy resin, bisphenol F novolac epoxy resin, stilbene epoxy resin, epoxy resin containing triazine skeleton, epoxy resin containing fluorene skeleton , Triphenol phenol methane type epoxy resin, biphenyl type epoxy resin, xylylene type epoxy resin, biphenyl aralkyl type epoxy resin, naphthalene type epoxy resin, dicyclopentadiene type epoxy resin Resins, alicyclic epoxy resins, polyfunctional phenols and condensed ring aromatic diglycidyl ether compounds, trifunctional and tetrafunctional epoxy resins with 3 or 4 epoxy groups in the molecule, and phosphorus-containing rings At least one of the group consisting of oxy resin.

In more detail, the phosphorus-containing epoxy resin is a phosphorus-containing epoxy resin obtained by introducing phosphorus compounds into the aforementioned epoxy resin; and the diglycidyl ether compound of polyfunctional phenols and condensed ring aromatics may further include: Glycidylamine epoxy resin (hydantoin epoxy resin) containing a hydantoin ring (five-membered diaza heterocyclic ring) in the structure, as shown in the following formula:

(式一)；其中，R₁ 和R₂ 為甲基或乙基，n為介於0至10之間的正整數；

(Formula 1); wherein, R ₁ and R ₂ are methyl or ethyl, and n is a positive integer between 0 and 10;

(式二)；其中，R為苯環或萘環。

(Formula 2); Wherein, R is a benzene ring or a naphthalene ring.

(式三)。

(Equation three).

In detail, Hydantion Epoxy Resin is a glycidylamine epoxy resin containing a hydantoin ring (five-membered diazacyclic ring) in the molecular structure, and the most common one is dimethyl hydantoin epoxy Resin. Specifically, the hydantoin ring can effectively improve toughness, rigidity, water solubility and increase the glass transition temperature Tg (to about 175°C). In addition, the low-molecular-weight dimethylhydantoin epoxy resin can be further modified with an active toughening agent to improve the toughness of the epoxy resin (as shown in formula 2); or it can react with acrylic acid to shrink The ring-opening of the base introduces a double bond, and it is modified into a water-soluble light-curable resin (as shown in formula 3).

Preferably, the epoxy resin can be composed of the aforementioned types of resins in different proportions. For example, the epoxy resin of the present invention can be composed of 20 to 40 parts by weight of dicyclopentadiene epoxy resin, 10 to 20 parts by weight. Parts by weight of polyfunctional phenols and condensed ring aromatic diglycidyl ether compounds and 40 to 60 parts by weight of cresol novolac epoxy resin. In more detail, the dicyclopentadiene (DCPD) epoxy resin can effectively reduce the dielectric constant (D _k ) value, reducing D _k to 4.0. Multifunctional phenols and fused-ring aromatic diglycidyl ether compounds can increase the glass transition temperature (Tg) and improve the structural toughness of the product. Cresol-type epoxy resin can increase the glass transition temperature (Tg) and reduce the electrical properties.

9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, DOPO) modification hardener is mainly used in the present invention It is used as a hardener combined with epoxy resin. In addition to providing good thermal stability and low dielectric properties, the modified hardener can also improve the flame retardant effect. The halogen-free low-dielectric composition of the present invention The DOPO modified hardener is selected from the group consisting of DOPO-hydroquinone resin, DOPO-naphthalene glycol resin, DOPO-novolac resin and DOPO-bisphenol phenolic resin. Furthermore, DOPO-bisphenol phenolic resin is selected from DOPO-bisphenol A novolac resin (DOPO-BPAN), DOPO-bisphenol F novolac resin (DOPO-BPSN) and DOPO-bisphenol S novolac resin (DOPO-BPSN).

In a specific embodiment of the present invention, the benzoxazine resin is selected from at least one of the following groups: BPA type benzoxazine, BPF type benzoxazine, BPS type benzoxazine, DDM type benzene And oxazine, ODA type benzoxazine and polybenzoxazine with polyimide (polybenzoxazine with polyimide). The benzoxazine resin can reduce the dielectric constant D _k (1-10 GHz, about 4.1 on average), the dielectric loss factor D _f (1-10 GHz, about 0.008 on average), and improve heat resistance.

；In a specific embodiment of the present invention, the active ester compound has the following structure:

；

，R₂ 是選自萘酚、苯酚、聯苯酚、雙酚A、雙酚F、雙酚S以及雙環戊二烯(DCPD)所組成的群組，l、m、k為0或1，n是介於0.25至2。具體來說，活性酯合物可有效降低介電常數D_k 、耗損因數D_f 及提升阻燃效果。Among them, X is a benzene ring or a naphthalene ring, and R ₁ is CH ₂ or

, R ₂ is selected from the group consisting of naphthol, phenol, biphenol, bisphenol A, bisphenol F, bisphenol S and dicyclopentadiene (DCPD), l, m, k are 0 or 1, n It is between 0.25 and 2. Specifically, the active ester compound can effectively reduce the dielectric constant D _k , the dissipation factor D _f and enhance the flame retardant effect.

In a specific embodiment of the present invention, the maleic anhydride modified hardener is selected from at least one of the following groups:

，(1) Styrene-maleic anhydride copolymer with the following structure:

,

Where m and n are the same or different positive integers;

(2) Modified maleic anhydride copolymer with the following structure:

Wherein, X, Y and n are the same or different positive integers, and R is acetic anhydride; or

；(3) Maleic anhydride modified polyimide resin with the following structure:

；

Wherein, X represents a carbon chain group containing more than 10 carbon atoms, a group containing a benzene ring, or the structure of a carbon chain containing more than 10 carbon atoms and a benzene ring group, m, n, and l are all integers and Greater than or equal to 1.

Specifically, maleic anhydride modified hardener can reduce the dielectric loss factor D _f (1-10 GHz, average about 0.008) and improve heat resistance.

In a specific embodiment of the present invention, the flame retardant of the present invention uses a non-DOPO flame retardant, which means that it does not contain 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide ( DOPO) derivatives. In detail, the POC bond in the DOPO structure is easily hydrolyzed into P-OH, which will increase the dielectric constant and dielectric loss of the material. Therefore, the use of non-DOPO flame retardants can avoid increasing the dielectric constant D _k and the dielectric constant of the material. Depletion D _f .

(Ⅰ)、

(Ⅱ)以及

(Ⅲ)；In more detail, the non-DOPO flame retardant can be selected from the group consisting of compounds of structural formula (I), structural formula (II) and structural formula (III):

(Ⅰ),

(Ⅱ) and

(Ⅲ);

、

、

、

、

、

、

或

；Where R ₁ is

,

,

,

,

,

,

or

；

、

、

或

；Where R ₂ is

,

,

or

；

、

或CH₂ CH₂ OCH=CH₂ ；Where R ₃ is

,

Or CH ₂ CH ₂ OCH=CH ₂ ;

Wherein, n is an integer from 0 to 500;

或

； 其中，m≧1；Where R ₄ is

or

; Among them, m≧1;

或

；Where R ₅ is

or

；

、

或

。Where R ₆ is

,

or

.

In detail, the non-DOPO flame retardant can be selected from phosphate compounds or nitrogen-containing phosphate compounds, for example, can be selected from resorcinol dixylenyl phosphate (resorcinol dixylenyl phosphate, RDXP (such as PX-200) )), melamine polyphosphate, tri(2-carboxyethyl)phosphine (TCEP), trimethyl phosphate (TMP), tris(isopropyl chloride) ) Phosphate, dimethyl methyl phosphonate (DMMP), bisphenol diphenyl phosphate, ammonium polyphosphate, hydroquinone-bis-(biphenyl) Hydroquinone bis-(diphenyl phosphate), bisphenol A bis-(diphenylphosphate), and Phosphazene (such as SPB-100) 'S group.

Preferably, the hardening accelerator of the present invention can be selected from at least one of the group consisting of imidazole, metal salt, tertiary amine or piperidine compound, or a mixture thereof, and further can be selected from boron trifluoride amine compound Compounds, 2-ethyl-4-methylimidazole (2E4MI), 2-methylimidazole (2MI), 2-phenyl-1H-imidazole (2-phenyl-1H-imidazole) , 2PZ), ethyltriphenyl phosphonium chloride (ethyltriphenyl phosphonium chloride), triphenylphosphine (TPP), cobalt(Ⅱ) acetylacetonate and 4-dimethylamino Pyridine (4-dimethylaminopyridine, DMAP), low-molecular-weight terminal bromine-based liquid butadiene rubber (BTPB), organic metal salts such as cobalt diacetone acetone (Ⅱ), cobalt triacetone acetone (Ⅲ), tertiary amines such as triethylamine, tributylamine, etc., and diazabicyclo[2,2,2]octane, etc. More preferably, the hardening accelerator is 4-dimethylaminopyridine. Specifically, the imidazole compound has particularly good compatibility with the resin component, so that a cured product with high uniformity can be obtained. Preferably, the addition amount of the hardening accelerator may be 1% based on 100 parts by weight of epoxy resin.

On the other hand, the inorganic filler can increase the thermal conductivity of the halogen-free low-dielectric composition and improve its thermal expansion and mechanical strength. Preferably, the inorganic filler is uniformly distributed in the halogen-free low-dielectric composition. Preferably, the inorganic filler can be surface-treated in advance with a silane coupling agent. Preferably, the inorganic filler may be spherical, flake, granular, columnar, plate, needle or irregular inorganic filler. Preferably, the inorganic filler is selected from silica (such as molten, non-molten, porous or hollow silica), aluminum oxide, aluminum hydroxide, magnesium oxide, magnesium hydroxide, calcium carbonate, nitriding A group consisting of aluminum, boron nitride, aluminum silicon carbide, silicon carbide, titanium dioxide, zinc oxide, zirconium oxide, barium sulfate, magnesium carbonate, barium carbonate, mica, talc, graphene. Preferably, the addition amount of the inorganic filler may be 100 to 120 parts by weight based on 100 parts by weight of epoxy resin.

In addition, the halogen-free low-dielectric composition of the present invention further includes an appropriate amount of solvent, for example, ketones, esters, ethers, alcohols, etc., more specifically, the solvent of the present invention is selected from acetone, The group consisting of butanone, propylene glycol methyl ether, propylene glycol methyl ether acetate, dimethylacetamide and cyclohexanone. For example, the solvent may be selected from a combination of 25 to 35 parts by weight of methyl ethyl ketone (MEK) and 20 to 30 parts by weight of propylene glycol methyl ether acetate (PMA) or a combination of other solvents and the like.

Furthermore, the halogen-free low-dielectric composition of the present invention may further include a toughening agent, such as a core-shell polymer, as required, to improve the toughness of the board and also improve the heat resistance. Preferably, the toughening agent can be selected from epoxy resin toughening agents, such as KANEKA's MX series products and Metablen's W series products, and the addition amount can be 2 parts by weight based on 100 parts by weight of epoxy resin. Specifically, the volume average particle diameter of the core-shell polymer is 0.01 to 1 μm, preferably 0.1 to 0.5 μm, and the glass transition temperature (Tg) of the core portion of the core-shell polymer is less than 0°C, and The glass transition temperature (Tg) of the shell part of the core-shell polymer is less than 20°C. More specifically, the core-shell polymer contains an intermediate layer between the core and the shell, and the intermediate layer contains 30 to 100% by weight Polyfunctional monomers and 0 to 70% by weight of vinyl monomers, and the shell part of the core-shell polymer contains epoxy monomers through the core-shell polymer epoxy monomers and epoxy resin The combination of epoxy groups can further improve the heat resistance of the composition of the present invention.

The present invention also provides another technical solution is a laminated board, which includes: (a) a resin substrate, which includes a plurality of semi-cured films, and each of the semi-cured films is coated with a glass fiber cloth as in the present invention It is made of a halogen-free low-dielectric composition; and (b) a metal foil layer, which is arranged on at least one surface of the resin substrate, or the metal foil layer can be arranged on the resin substrate as required.

In addition, the present invention provides another technical solution which is a printed circuit board, which includes the laminated board of the present invention.

[Example]

The following examples E1 to E5 use the halogen-free low-dielectric composition of the present invention to manufacture semi-cured films in a continuous process. Usually glass fiber cloth is used as the base material. The roll-shaped glass fiber cloth continuously passes through a series of rollers into the gluing tank, and the halogen-free low-dielectric composition of the present invention is installed in the tank. In the gluing tank, the glass fiber cloth is fully infiltrated by the resin, and then the excess resin is scraped off by the metering roller, and then it enters the gluing furnace for a certain period of time to allow the solvent to evaporate and solidify the resin to a certain extent, cool, and rewind to form a half Curing the film, and then take the prepregs made in the above batches, take four prepregs of the same batch and two 18 μm copper foils, and stack them in the order of copper foil, four prepregs, and copper foil, and then The copper foil substrate was formed by pressing at 220°C for 2 hours under vacuum conditions, and four sheets of semi-cured film were cured to form an insulating layer between the two copper foils. Table 1 Component E1 E2 E3 E4 E5 Epoxy resin DCPD epoxy 30 30 25 25 25 Cresol novolac epoxy 55 55 50 50 50 Multi-functional epoxy 15 15 15 0 0 Hydantion epoxy 0 0 0 15 15 hardener DOPO-BPAN (DOPO-bisphenol A novolac resin) 25 25 25 15 15 Benzoxazine resin 10 15 10 10 10 Active ester compound (HPC-8000) 110 100 110 100 100 Anhydride modified hardener 10 15 10 20 20 Flame retardant Resorcinol dixylenylphosphate 10 15 10 10 10 Cyclic phosphazene 20 15 20 20 20 Toughener Core shell rubber 2 2 2 2 2 Inorganic filler Fused silica 90 90 90 90 90 Spherical silica 10 10 10 10 10 Accelerator DMAP (4-dimethylaminopyridine) 1 1 1 1 1 Solvent MEK (butanone) 30 30 30 30 30 PMA (Propylene Glycol Methyl Ether Ethyl) 20 20 20 20 20 PM (Propylene Glycol Methyl Ether) 15 15 15 15 15 Toluene (toluene) 30 30 30 30 30 [Comparative Example] A prepreg film was manufactured in a continuous process according to the components and ratios of Comparative Examples C1 to C5 in Table 2 below. Usually glass fiber cloth is used as the base material. The roll-shaped glass fiber cloth continuously passes through a series of rollers into the gluing tank, and the halogen-free low-dielectric composition of the present invention is installed in the tank. In the gluing tank, the glass fiber cloth is fully infiltrated by the resin, and then the excess resin is scraped off by the metering roller, and then it enters the gluing furnace for a certain period of time to allow the solvent to evaporate and solidify the resin to a certain extent, cool, and rewind to form a half Curing the film, and then take the prepregs made in the above batches, take four prepregs of the same batch and two 18 μm copper foils, and stack them in the order of copper foil, four prepregs, and copper foil, and then The copper foil substrate was formed by pressing at 220°C for 2 hours under vacuum conditions, and four sheets of semi-cured film were cured to form an insulating layer between the two copper foils. Table 2 Component C1 C2 C3 C4 Epoxy resin HP-7200 40 40 40 40 NC-3000 60 60 60 60 Maleic anhydride hardener Styrene Maleic Anhydride (SMA) EF60 30 - - Modified maleic anhydride copolymer of formula 1 - - 20 - Modified maleic anhydride copolymer of formula 2 - - 20 - Maleic anhydride modified polyimide resin of formula 3 - - - 40 Benzoxazine resin LZ8280 - 60 - 50 Flame retardant Formula I flame retardant 36 - - - Formula II flame retardant - - 60 - Formula III flame retardant - 62 - - SAYTEX 8010 - - - 30 Flame retardant compound PX-200 (resorcinol bis-xylyl phosphate) - - - - TCEP (Tris(2-chloroethyl) phosphate) - - - - TMP - - - - Inorganic filler Fused silica 28 57 47 41 Hardening accelerator 2E4MI (2-ethyl-4-methylimidazole) 1 1 1 1 Solvent MEK (butanone) 42 80 114 97 PMA (Propylene Glycol Methyl Ether Ethyl) 20 - - - * HP-7200: DCPD (dicyclopentadiene type) type epoxy resin * NC-3000: Nippon Kayaku Co., Ltd. biphenyl type epoxy resin [Physical Property Test] The above Examples E1 to E5 and Comparative Examples C1 to The physical properties of the C5 copper foil laminated board are tested, and the test results are recorded in Table 3: (1) Glass transition temperature (Tg): According to differential scanning calorimetry (DSC), according to IPC-TM-650 2.4.25 The DSC method is used for the determination. (2) Copper foil laminated board heat resistance (T288): also known as "tin bleaching result", the heat resistance test is based on the industry standard IPC-TM-650 2.4.24.1, the copper foil laminated board is immersed in a 288℃ tin furnace until the board bursts The time required. (3) Test of immersion tin after moisture absorption of copper-clad laminates: heat resistance (T288) test using semi-cured film with copper-foil layer, and immerse the copper-clad laminates in accordance with the industry standard IPC-TM-650 2.4.24.1 The time required for the tin furnace to burst at 288°C. (4) Copper foil laminated board heat resistance (S/D) test: copper-containing substrate immersion tin test (solder dip 288°C, 10 seconds, measuring the number of heat resistance cycles). (5) Copper-clad laminate heat resistance (PCT) test: PCT moisture absorption test after non-copper substrate PCT (pressure cooking at 121°C, 1 hour later, test solder dip at 288°C, 20 seconds to see if there is any cracking). (6) Peeling strength, half ounce copper foil (P/S) between the copper foil and the substrate: Measured according to the IPC-TM-650 2.4.1 testing specification. (7) Dielectric constant (D _k ): Measured in accordance with IPC-TM-650 2.5.5 testing specifications. The dielectric constant represents the electrical insulation properties of the film. The lower the value, the better the electrical insulation properties. (8) Dielectric loss (D _f ): Measured in accordance with IPC-TM-650 2.5.5 testing specifications. Dielectric loss indicates the ability of a substance to absorb microwaves of a certain frequency at a certain temperature, usually in the specifications of communication products , The dielectric loss value needs to be as low as possible. (9) Flaming test (UL94): Measured in accordance with the UL94 vertical combustion method, which uses the spontaneous combustion time, spontaneous combustion speed, and the state of falling particles to determine the flame resistance level of the plastic material after a standard test piece of plastic material is burned. . According to the fire resistance grade, it is HB, V-2, V-1, V-0, and the highest is 5V. The UL 94 test method refers to that the plastic material burns on the flame in a vertical manner. Taking every ten seconds as a test cycle, the steps are as follows: Step 1: Put the test piece into the flame for ten seconds and then remove it, and measure the burning time (T1) of the test piece after it is removed; Step 2: When the test piece flames After extinguishing, put it in the flame for ten seconds and then remove it, and then measure the continuous burning time (T2) of the test piece after removal; Step 3: Repeat the experiment several times and take the average value; Step 4: Calculate T1+T2 total. The requirement of UL 94 V-0 is that the average of T1 and T2 of a single burning time of the test piece must not exceed 10 seconds, and the total of T1 and T2 must not exceed 50 seconds to meet the requirements of UL 94 V-0. . Nature test Test Methods E1 E2 E3 E4 E5 C1 C2 C3 C4 Glass transition temperature (Tg) DSC 159 162 151 158 250 161 168 147 171 Heat resistance of copper-containing substrate (T288) TMA >60 >60 >60 >60 >60 5 twenty two 32 >70 S/D dip cycles >20 >20 >20 >20 >20 3 18 8 >20 PCT (dip minute) 20 s/288℃ qualified qualified qualified qualified qualified Unqualified qualified Unqualified qualified P/S (lb/min) Hoz Cu foil 6.7 6.3 6.8 6.2 8.1 5.2 5.8 5.5 6.1 D _k @10GHz 10GHz 3.98 4.05 4.02 3.96 4.62 3.93 4.14 4.25 4.21 D _f @10GHz 10GHz 0.007 0.007 0.007 0.008 0.007 0.015 0.009 0.012 0.013 Flame resistance UL94 V-0 V-0 V-0 V-0 V-0 V-0 V-0 V-0 V-0 other PP appearance good good good good good good Difference Difference good table 3

[Beneficial effects of the embodiment]

One of the beneficial effects of the present invention is that the halogen-free low-dielectric composition of the present invention can provide a halogen-free epoxy resin composition with a specific composition and ratio, and it has a high glass transition temperature and a low dielectric. The characteristics of electric constant, low dielectric loss, high heat resistance and high storage modulus. It can be made into semi-cured film or resin film to achieve the purpose of being applicable to copper foil substrates and printed circuit boards; in terms of industrial applicability, the products derived from the present invention can fully satisfy the current market need.

The content disclosed above is only the preferred and feasible embodiments of the present invention, and does not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the description and schematic content of the present invention are included in the application of the present invention. Within the scope of the patent.

without

without

Claims (14)

A halogen-free low-dielectric composition comprising: (a) 100 parts by weight of epoxy resin; (b) 10 to 25 parts by weight of DOPO modified hardener; (c) 10 to 20 parts by weight of benzoxazine resin; (d) 100 to 120 parts by weight of active ester compound; (e) 10 to 20 parts by weight of maleic anhydride modified hardener; and (f) 20 to 45 parts by weight of non-DOPO flame retardant. The halogen-free low-dielectric composition according to claim 1, wherein the epoxy resin is selected from the group consisting of bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, and phenol Phenolic epoxy resin, cresol novolac epoxy resin, bisphenol A novolac epoxy resin, bisphenol F novolac epoxy resin, stilbene epoxy resin, epoxy resin containing triazine skeleton, containing Epoxy resin with fluorene skeleton, triphenol phenol methane type epoxy resin, biphenyl type epoxy resin, xylylene type epoxy resin, biphenyl aralkyl type epoxy resin, naphthalene type epoxy resin, bicyclic Pentadiene epoxy resins, alicyclic epoxy resins, polyfunctional phenols and fused-ring aromatic diglycidyl ether compounds, trifunctional and tetrafunctional rings with 3 or 4 epoxy groups in the molecule At least one of the group consisting of oxygen resin and phosphorus-containing epoxy resin. The halogen-free low-dielectric composition according to claim 1, wherein the DOPO modified hardener is selected from the group consisting of DOPO-hydroquinone resin, DOPO-naphthalene glycol resin, DOPO-novolac resin, and DOPO- A group of bisphenol phenolic resins. The halogen-free low-dielectric composition according to claim 1, wherein the benzoxazine resin is at least one selected from the following group: BPA-type benzoxazine, BPF-type benzoxazine, BPS Type benzoxazine, DDM type benzoxazine, ODA type benzoxazine and polyimide benzoxazine. The halogen-free low-dielectric composition according to claim 1, wherein the active ester compound has the following structure:

Among them, X is a benzene ring or a naphthalene ring, and R ₁ is CH ₂ or

, R ₂ is selected from the group consisting of naphthol, phenol, biphenol, bisphenol A, bisphenol F, bisphenol S and dicyclopentadiene (DCPD), l, m, k are 0 or 1, n It is between 0.25 and 2. The halogen-free low-dielectric composition according to claim 1, wherein the maleic anhydride modifying hardener is at least one selected from the following groups: (1) styrene-maleic anhydride copolymer having the following structure Thing

Wherein m and n are the same or different positive integers; (2) Modified maleic anhydride copolymer with the following structure:

Wherein X, Y and n are the same or different positive integers, R is acetic anhydride; or (3) Maleic anhydride modified polyimide resin with the following structure:

Where X represents the structure of a carbon chain group containing more than 10 carbon atoms, a group containing a benzene ring, or a carbon chain containing more than 10 carbon atoms and a benzene ring group, m, n, and l are all integers and greater than Equal to 1. The halogen-free low-dielectric composition according to claim 1, further comprising: a hardening accelerator, the hardening accelerator is selected from boron trifluoride amine complex, 2-ethyl-4-methylimidazole , 2-methylimidazole, 2-phenylimidazole, ethyltriphenylphosphonium chloride, triphenylphosphine, cobalt(II) acetone acetone, 4-dimethylaminopyridine, bromo-terminated liquid butanedi A group consisting of olefin rubber, cobalt diacetylacetone (Ⅱ), cobalt triacetone (Ⅲ), triethylamine, tributylamine, diazabicyclo[2,2,2]octane. The halogen-free low-dielectric composition according to claim 1, further comprising: an inorganic filler, the inorganic filler is selected from silicon dioxide, aluminum oxide, aluminum hydroxide, magnesium oxide, magnesium hydroxide, calcium carbonate , Aluminum nitride, boron nitride, aluminum silicon carbide, silicon carbide, titanium dioxide, zinc oxide, zirconium oxide, barium sulfate, magnesium carbonate, barium carbonate, mica, talc and graphene. The halogen-free low-dielectric composition according to claim 1, further comprising: a solvent, and the solvent is selected from the group consisting of acetone, methyl ethyl ketone, propylene glycol methyl ether, propylene glycol methyl ether acetate, and dimethyl acetamide And the group consisting of cyclohexanone. The halogen-free low-dielectric composition according to claim 1, further comprising: a toughening agent, and the toughening agent is a core-shell polymer with a volume average particle diameter of 0.01 to 1 μm. The halogen-free low-dielectric composition according to claim 10, wherein the core-shell polymer further includes a core part and a core-shell, and the glass transition temperature of the core part is lower than 0°C, and the core-shell The glass transition temperature is below 20°C. The halogen-free low-dielectric composition according to claim 11, wherein the core-shell polymer further includes an intermediate layer, and the intermediate layer includes 30 to 100% by weight of a multifunctional monomer and 0 to 70% by weight % Of vinyl monomers; wherein the shell portion of the core-shell polymer includes epoxy monomers. A laminated board, which includes: A resin substrate comprising a plurality of semi-cured films, and each of the semi-cured films is made of a glass fiber cloth coated with the halogen-free low-dielectric composition according to claim 1; and A metal foil layer is arranged on at least one surface of the resin substrate. A printed circuit board including the build-up board according to claim 13.