WO2009150818A1 - 難燃性接着剤組成物及び積層フィルム - Google Patents
難燃性接着剤組成物及び積層フィルム Download PDFInfo
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- WO2009150818A1 WO2009150818A1 PCT/JP2009/002575 JP2009002575W WO2009150818A1 WO 2009150818 A1 WO2009150818 A1 WO 2009150818A1 JP 2009002575 W JP2009002575 W JP 2009002575W WO 2009150818 A1 WO2009150818 A1 WO 2009150818A1
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- WIPO (PCT)
- Prior art keywords
- foaming agent
- polyamidoamine
- resin composition
- phosphorus compound
- laminated film
- Prior art date
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Definitions
- the present invention relates to an adhesive composition having a high level of flame retardancy, in particular, a flame retardant adhesive composition that achieves a high level of flame resistance without using a halogen-based flame retardant, and a laminate using the same.
- a flame retardant adhesive composition that achieves a high level of flame resistance without using a halogen-based flame retardant, and a laminate using the same.
- halogen-based compound particularly a bromine-based compound
- a halogen-based compound causes the generation of harmful gases such as dioxins during combustion, which not only has problems with safety during waste incineration and thermal recycling, but also causes fires.
- the generation of harmful gases at times can affect the human body. Therefore, the use of inorganic flame retardants such as phosphorus compounds, metal hydroxides, nitrogen compounds, etc., as an alternative to halogen compounds has been studied.
- Patent Document 1 discloses a flame retardant resin composition containing an epoxy resin, a curing agent, and a phosphine oxide as essential components.
- Patent Document 2 discloses an phosphinic acid salt as an epoxy resin, a curing agent, and a flame retardant.
- flame retardant epoxy tree flame retardant containing diphosphinate is disclosed
- Patent Document 3 discloses an average particle size of 2 as a resin composition excellent in flame retardancy, heat resistance and metal foil peeling strength.
- a resin composition containing a phosphinic acid salt having a surface area of ⁇ 5 ⁇ m and a specific surface area of 2.0 to 4.0 m 2 / g, a thermosetting resin, and a curing agent for the thermosetting resin is disclosed.
- Phosphorus compounds do not generate toxic gases during combustion like halogen compounds, but the flame retardancy imparting effect does not reach that of halogen compounds. Therefore, when the layer thickness of the adhesive composition layer is large, particularly when the layer thickness is 1 mm or more, flame retardancy can be sufficiently imparted, but when the layer thickness is small, the layer thickness is particularly large. In the case of less than 1 mm, there is a problem that flame retardancy cannot be sufficiently imparted. Moreover, even if an adhesive composition layer containing a phosphorus compound is interposed between films made of a non-flame retardant resin such as polyethylene terephthalate, sufficient flame retardancy cannot be imparted to the laminate. I had a problem.
- the present invention provides a flame retardant adhesive composition that does not use a halogen-based compound and is compounded with a phosphorus-based compound, which is superior to the conventional flame retardant adhesive composition of this type. It is an object of the present invention to provide a new flame retardant adhesive composition capable of imparting properties.
- the present invention comprises a thermosetting adhesive resin composition (A), a phosphorus compound (B) having a melting temperature of 170 ° C. or higher, and an unfoamed foaming agent (C).
- An adhesive composition is proposed.
- the flame retardant adhesive composition of the present invention does not contain a halogen-based compound, it does not generate environmental pollution or toxic gas during combustion, and is excellent in safety. Moreover, when heated to a high temperature, the carbonization reaction of the phosphorus compound (B) proceeds and the foaming agent (C) foams to form a heat insulating layer, so that exceptional flame retardancy can be imparted.
- the flame retardant adhesive composition of the present invention can impart sufficient flame retardancy even when the thickness of the adhesive composition layer using the same is small, and also, such as polyethylene terephthalate
- the adhesive composition layer composed of the flame retardant adhesive composition of the present invention on at least one surface of the layer composed of the non-flame retardant resin to form a laminated film, sufficient flame retardancy is achieved in the laminated film. Can be granted.
- the present flame retardant adhesive composition a flame retardant adhesive composition
- the scope of the present invention is not limited to the flame retardant adhesive composition described below.
- the flame retardant adhesive composition comprises a thermosetting adhesive resin composition (A), a phosphorus compound (B), and an unfoamed foaming agent (C). It is a composition.
- the thermosetting adhesive resin composition (A) may be an adhesive resin composition mainly composed of a thermosetting resin.
- thermosetting resins include epoxy resins, phenol resins, Saturated polyester resin, polyurethane resin, silicone, polyimide resin, fluororesin, urea resin, melamine resin, resorcinol resin, and the like can be given.
- the epoxy-type adhesive composition which has an epoxy resin and a hardening
- epoxy adhesive composition a combination of a general epoxy resin and a curing agent can be used.
- the epoxy resin include, for example, bisphenol A type epoxy resin, bisphenol F type phenoxy resin, bisphenol S type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, glycidyl.
- ester-type epoxy resins chelate-modified epoxy resins modified with these epoxy resins, urethane-modified epoxy resins, rubber-modified epoxy resins, and the like, and one or more of these A mixed resin composed of a combination can be used.
- urethane-modified epoxy resins are particularly preferable.
- Examples of commercially available epoxy resins include “827, 828, 828EL, 834” manufactured by Japan Epoxy Resin, “Adeka Resin” series manufactured by ADEKA, “Threebond 2000” series manufactured by ThreeBond, and the like.
- epoxy resin curing agents include aliphatic amines such as diethylenetriamine, triethylenetetramine, dipropylenediamine, diethylaminopropylamine, N-aminoethylpiperazine, and mensendiamine, metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenyl.
- Aromatic amines such as sulfone, or modified amines thereof, imidazole compounds such as 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecylimidazolium trimellitate, epoxy-imidazole adduct, etc.
- phthalic anhydride maleic anhydride, succinic anhydride, trimellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol Acids such as listrimellitate, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, dodecenyl succinic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, etc.
- An anhydride, a polyamide resin, a polysulfide resin, a liquid polymercaptan, etc. can be mentioned,
- the mixed resin which consists of 1 type of these or the combination of 2 or more types can be used.
- Commercially available epoxy resin curing agents include “ST” series manufactured by Japan Epoxy Resin, “HN-2200, HN-2000, HN-5500” manufactured by Hitachi Chemical Co., Ltd., “Threebond 2105C” manufactured by ThreeBond. And “Versamide” series manufactured by Cognis Japan.
- polyamidoamine as a curing agent from the viewpoint of adhesiveness.
- the polyamidoamine used as the curing agent preferably has an amine value of 50 to 350, more preferably 80 to 300, and particularly preferably 100 to 225.
- the viscosity of the flame retardant adhesive composition becomes moderate and the fluidity is increased, so that the film can be produced efficiently. Or since the followability of the obtained film increases, it can laminate
- the amine value of the polyamidoamine is more preferably 130 to 180, and further preferably 150 to 200.
- polyamidoamine one kind of polyamidoamine may be used, or a mixture of two or more polyamidoamines may be used.
- a mixture of two or more types of polyamidoamines it is preferable to adjust the amine value as a mixture, that is, the total value of “amine number ⁇ mixing ratio” of each polyamidoamine within the above range.
- polyamidoamine ( ⁇ -1) having an amine value of 50 to 95 and an amine value of 230 to 360 are used. It is particularly preferred to use a mixture of the polyamidoamine ( ⁇ -2).
- Polyamidoamine ( ⁇ -1) can provide excellent curability and secondary processability (bending, unrolling), while polyamidoamine ( ⁇ -2) provides excellent adhesion and flexibility. Since it can be imparted, curability, secondary processability, adhesion and flexibility can be improved in a well-balanced manner.
- the amine value of the polyamidoamine ( ⁇ -1) is more preferably from 70 to 93, and even more preferably from 80 to 90.
- the amine value of polyamidoamine ( ⁇ -2) is more preferably 230 to 320, and even more preferably 230 to 280.
- polyamidoamine ( ⁇ -1) having an amine value of 50 to 95 and polyamidoamine ( ⁇ -2) having an amine value of 230 to 360 polyamidoamine ( ⁇ -1) and polyamidoamine ( ⁇ -2) )
- the ratio of the polyamidoamine ( ⁇ -1) in the whole polyamidoamine (b) is preferably 10 to 90% by mass, particularly 20 to 80% by mass, especially 30 to 70% by mass. More preferably.
- a general method can be used as a manufacturing method of a polyamidoamine.
- it can be obtained by condensation polymerization of dimer acid, fatty acid and polyamine.
- the amine value can be adjusted by adjusting the polymerization ratio.
- Commercially available polyamidoamines include Cognis Japan's “Versamide” series, Sanyo Chemical Industries' “Polyamide” series, DIC's “Rakkamide” series, etc. Are available.
- a phosphorus compound (B) and a foaming agent (C) favorably, it is preferable to use a liquid thing for both an epoxy resin and a hardening
- the solvent-based adhesive composition it is difficult to increase the thickness of the adhesive composition layer composed of the flame retardant adhesive composition to a necessary and sufficient level.
- the mixing ratio of the epoxy resin and the curing agent is not particularly limited. As a guideline, it is preferable to blend so that the content of the curing agent is 30 to 90% by mass with respect to the total amount of the epoxy resin and the curing agent. By blending the epoxy resin and the curing agent within this range, excellent adhesion and workability can be maintained. From this point of view, the content of the curing agent with respect to the total amount of the epoxy resin and the curing agent is more preferably 40% by mass or more or 80% by mass or less, particularly 50% by mass or more. Or it is more preferable that it is 70 mass% or less. In addition to the epoxy resin and the curing agent, it is optional to add other additives that are usually added to the adhesive resin composition.
- the phosphorus compound (B) is a compound containing phosphorus and is preferably a compound having a melting temperature of 170 ° C. or higher.
- the phosphorus compound having a melting temperature of 170 ° C. or higher includes a phosphorus compound in a solid state at a higher temperature (for example, around 250 ° C.).
- the flame retardant adhesive composition is heated to about 120 to 150 ° C. in the manufacturing process including the raw material mixing step. Therefore, when the melting temperature is lower than 170 ° C., not only the flame retardancy is deteriorated, but also the phosphorus-based adhesive composition.
- the compound may melt and phase separate from the thermosetting adhesive resin composition (A).
- the melting temperature of the phosphorus compound (B) is preferably 170 ° C. or higher. Furthermore, since it is assumed that the flame retardant adhesive composition is processed while being heated to 190 ° C. or higher, or is subjected to an aging treatment at 190 ° C. or higher at the time of processing, a phosphorous having a melting temperature of 190 ° C. or higher. By using the compound (B), the phase separation from the thermosetting adhesive resin composition (A) and the bleeding out of the phosphor compound to the surface of the molded product can be suppressed even during such processing. Can do. Therefore, it is more preferable to use a phosphorus compound having a melting temperature of 190 ° C. or higher as the phosphorus compound (B). However, the phosphorus compound having a melting temperature of 190 ° C. or higher includes a phosphorus compound in a solid state at a higher temperature (for example, around 250 ° C.).
- Examples of phosphorus compounds having a melting temperature of 190 ° C. or higher include dimethylphosphinic acid, ethylmethylphosphinic acid, diethylphosphinic acid, methyl-n-propylphosphinic acid, methandi (methylphosphinic acid), benzene-1,4- ( Dimethylphosphinic acid such as dimethylphosphinic acid), methylphenylphosphinic acid, diphenylphosphinic acid, etc., or alkali metal salt of dialkyl acid, magnesium, calcium, aluminum, tin, lead, germanium, titanium, zinc, iron, cesium, strontium Examples thereof include phosphinic acid salts obtained by reacting with metal compounds such as manganese, lithium, sodium, and potassium, condensed phosphate ester amides, and ammonium polyphosphate. A mixture of one or a combination of two or more of these can be used.
- a phosphinic acid salt particularly a metal salt of phosphinic acid, such as aluminum diethylphosphinate.
- a phosphinate is blended as the phosphorus compound (B)
- flame retardancy can be obtained even at a lower concentration than other phosphorus compounds.
- a film is prepared from the flame retardant adhesive composition. In this case, since it is difficult to increase the viscosity, it is easy to produce a film and the film strength can be maintained. Moreover, dripping at the time of combustion can also be suppressed.
- phosphinic acid salts for example, EXOLIT OP1230, 930, 935 manufactured by Clariant Japan Co., SP703H manufactured by Shikoku Kasei Kogyo Co., Ltd. as condensed phosphoric ester amide, and ZURAN484 manufactured by CHITEC Co., Ltd. as ammonium polyphosphate are used. Can be mentioned.
- the specific surface area of the phosphorus compound used as the phosphorus compound (B) is preferably 5 m 2 / g or more, particularly preferably 7 m 2 / g or more, and more preferably 10 m 2 / g or more. On the other hand, it is preferably 20 m 2 / g or less, particularly preferably 17 m 2 / g or less, more preferably 15 m 2 / g or less. If the specific surface area of the phosphorus compound (B) is 5 m 2 / g or more, sufficient flame retardancy can be imparted, and if it is 20 m 2 / g or less, poor dispersion due to increase in viscosity, poor molding. Etc. does not occur.
- the compounding quantity of a phosphorus compound (B) is not specifically limited.
- the content is preferably 10 to 70% by mass with respect to the total mass of the flame retardant adhesive composition, more preferably 30% by mass or more and 60% by mass or less, and more preferably 40% by mass. More preferably, it is at least mass% or at most 55 mass%.
- a phosphorus compound (B) particularly a phosphinic acid salt
- the phosphorus compound (B) is too small and flame retardancy is not obtained, while the phosphorus compound (B) is large. Therefore, it is preferable because mechanical properties such as film strength are not lowered and viscosity is not excessively increased during molding.
- Whether or not the foaming agent (C) is in an unfoamed state is determined by observing the cross section of the layer or molded product (including film or film) made of the flame retardant adhesive composition with an electron microscope. It can be clearly determined by observing the state of voids around the foaming agent.
- a thin piece of 700 mm in thickness is collected from a molded article (including a film and a film) made of the flame retardant adhesive composition, and observed with a scanning electron microscope at 2000 times magnification, By measuring how many voids of 1 ⁇ m or more exist within the actual size of 30 ⁇ m ⁇ 30 ⁇ m, it is possible to determine that the number of voids is 5 or less as an “unfoamed state”.
- the foaming agent includes an exothermic foaming agent and an endothermic foaming agent, but it is preferable to use an endothermic foaming agent in the flame retardant adhesive composition.
- an exothermic foaming agent When an exothermic foaming agent is used, combustion proceeds at an accelerated rate due to heat generated by foaming. Therefore, it is preferable to use an endothermic foaming agent from the viewpoint of flame retardancy.
- both exothermic foaming agent and endothermic foaming agent can be mixed and used.
- An endothermic foaming agent is a foaming agent that involves an endothermic reaction during foaming.
- Examples of such an endothermic foaming agent include an inorganic foaming agent mainly composed of an inorganic substance such as sodium hydrogen carbonate and magnesium carbonate, or an organic foaming agent mainly composed of azodicarbonamide.
- the foaming agent (C) it is preferable to use a foaming agent having a decomposition temperature of 190 ° C. or higher. Since this flame retardant adhesive composition is processed while being heated to 190 ° C or higher, or is subjected to aging treatment at 190 ° C or higher during processing, foaming is performed so that the foaming agent does not foam during processing.
- the decomposition temperature of the agent (C) is preferably 190 ° C. or higher.
- the carbonization reaction of the phosphorus compound (B) is preferably promoted by the heat generated when the foaming agent (C) is foamed.
- the decomposition temperature of the foaming agent (C) is 350 ° C. or less.
- the decomposition temperature of the foaming agent (C) is preferably 190 to 350 ° C., more preferably 195 ° C. or more and 300 ° C. or less, especially 200 ° C. or more or 250 ° C. It is more preferable that the temperature is not higher than ° C.
- the decomposition temperature of the foaming agent (C) is, for example, when using Thermo Plus TG8120 manufactured by RIGAKU, the foaming agent is heated at a heating rate of 5 ° C./min in a nitrogen atmosphere, and the weight decreases by 1%. The temperature can be measured as the decomposition temperature.
- foaming agent (C) examples include, for example, an inorganic foaming agent mainly composed of sodium hydrogen carbonate or magnesium carbonate, azodicarbonamide, N, N′-dinitrosopentamethylenetetramine, 4, Examples thereof include organic foaming agents mainly composed of 4′-oxybis (benzenesulfonylhydrazide) and the like. These can be used alone or in combination. Among these, it is preferable to use any of sodium hydrogen carbonate and azodicarbonamide, or a mixture thereof.
- foaming agents include Sankyo Kasei's “Cermic” series (organic foaming agents and inorganic foaming agents), Eiwa Kasei Kogyo's “Selbon” series (inorganic foaming agents), and “Neoselbon” "Series (organic foaming agents)", “Exceller” series (organic foaming agents), “Spancell” series (organic foaming agents), “Vinihole AC” series (organic foaming agents), “Cellular” series (organic) Foaming agent) and the like.
- the blending amount of the foaming agent (C) is not particularly limited. For example, it is preferably blended at a ratio of 0.1 to 10% by mass with respect to the total mass of the flame retardant adhesive composition, more preferably 1% or more or 8% by mass or less, especially 3% by mass or more. Or it is further more preferable to mix
- excellent adhesiveness and flame retardancy can be imparted without reducing mechanical properties (for example, film strength).
- the flame retardant adhesive composition of this invention in the range which does not impair the effect of this invention, it is an ultraviolet-ray with respect to the flame retardant adhesive composition of this invention, and / or the resin composition which forms the layer attached to a flame retardant adhesive composition.
- Absorbers, plasticizers, fillers, colorants such as pigments and dyes, antioxidants, heat stabilizers and the like may be blended.
- This flame-retardant adhesive composition can be produced by mixing and melting the thermosetting adhesive resin composition (A), the phosphorus compound (B), the foaming agent (C), and other additives. At this time, it is preferable to perform mixing while heating by appropriately selecting according to the type and reactivity of the resin as necessary. However, the heating temperature must be at least lower than the decomposition temperature of the foaming agent (C), more preferably lower than the melting temperature of the phosphorus compound (B), and more preferably 130 ° C. or less. Even more preferred. Moreover, it is preferable to mix raw materials in a nitrogen atmosphere as necessary.
- the form of the flame retardant adhesive composition may be a form of an adhesive obtained by melting and mixing raw materials, and cross-linking or curing as necessary, or a film, film, sheet, or panel.
- the shape formed by processing to other shape may be sufficient. At this time, a known method may be appropriately employed for each forming method.
- the epoxy resin and the curing agent can be reacted and cured by such curing (aging).
- the curing (aging) temperature needs to be at least lower than the decomposition temperature of the foaming agent (C), and is preferably lower than the melting temperature of the phosphorus compound (B), particularly 130 ° C. or less. More preferred. Moreover, it is preferable to carry out in nitrogen atmosphere as needed.
- this flame-retardant adhesive composition can realize excellent flame retardancy and excellent adhesiveness even if it is less than 1 mm thick, for example, for adhesion of various resin materials that require flame retardancy. Can be used.
- a flame-retardant resin laminated body can also be formed as follows.
- the flame retardant adhesive composition is difficult to flame retardant, because the foaming agent (C) foams together with the carbonization reaction of the phosphorus compound (B) to form a heat insulating layer during combustion.
- the foaming agent (C) foams together with the carbonization reaction of the phosphorus compound (B) to form a heat insulating layer during combustion.
- non-flame retardant resin layer a resin layer containing a thermosetting resin or a thermoplastic resin on one side, ie, one side or both sides of the flame retardant adhesive composition layer comprising the flame retardant adhesive composition
- non-flame retardant resin layer a resin layer containing a thermosetting resin or a thermoplastic resin on one side, ie, one side or both sides of the flame retardant adhesive composition layer comprising the flame retardant adhesive composition
- the non-flame retardant resin layer can be formed of a non-flame retardant resin that is not recognized as a flame retardant resin, such as an olefin resin, polyethylene terephthalate, styrene resin, or the like.
- the total thickness of the laminated film is 500 ⁇ m or less, preferably 400 ⁇ m or less, and more preferably 300 ⁇ m or less.
- the ratio of the thickness of the flame retardant adhesive composition layer to the total thickness of the laminated film is 20 to 70%, particularly 30% or more and 70% or less, and particularly 40% or 70% or less. preferable. By setting it as such a range, flame retardancy can be imparted without impairing the mechanical properties and heat resistance inherent in the non-flame retardant resin.
- the flame retardant adhesive composition is added to another thermosetting resin or thermoplastic. This can be done by co-extrusion with a resin, or by laminating a film made of the flame retardant adhesive composition by extrusion lamination, heat lamination, dry lamination or the like.
- the heating temperature at the time of processing needs to be at least lower than the decomposition temperature of the foaming agent (C), and is preferably lower than the melting temperature of the phosphorus compound (B), particularly at 130 ° C. or less. More preferably. After processing in this way, it may be cured (aging) by heat treatment at 30 to 100 ° C. for 1 to 24 hours, if necessary.
- the laminate comprising the flame retardant adhesive composition layer comprising the flame retardant adhesive composition has excellent flame retardancy, peel strength, and mechanical strength.
- the laminated film can be disposed in electronic devices such as a liquid crystal display, a car navigation system, a mobile phone, a game machine, an audio player, a digital camera, a television, an electronic dictionary, a hard disk recorder, and a video camera.
- electronic devices such as a liquid crystal display, a car navigation system, a mobile phone, a game machine, an audio player, a digital camera, a television, an electronic dictionary, a hard disk recorder, and a video camera.
- it distributes to the battery of an electronic device it can distribute so that a battery main body may be covered.
- a personal computer it can be arranged by being sandwiched between places where insulation is required or by being fixed with an adhesive tape or the like.
- the “flame retardant” of the “flame retardant adhesive composition” is based on the criteria of the UL 94 vertical combustion test UL 94 VTM, and satisfies at least the VTM-2 standard, preferably the VTM-1 standard. Those satisfying the requirements, preferably satisfying the VTM-0 standard.
- the form of the “flame retardant adhesive composition” is arbitrary, and may be, for example, a layer form, a film form, a film form, a sheet form, a panel form, or any other form.
- the “non-flame retardant resin layer” does not satisfy the VTM-2 standard based on the UL94 vertical combustion test UL94VTM criteria.
- the expression “main component” includes the meaning of allowing other components to be contained within a range that does not hinder the function of the main component unless otherwise specified.
- the content ratio of the main component is not specified, but the component (when two or more components are main components, the total amount thereof) is 50% by mass or more, particularly 70% by mass or more in the composition. In particular, the case of occupying 90% by mass or more (including 100%) is included.
- X to Y (X and Y are arbitrary numbers) is described, it means “X or more and Y or less” unless otherwise specified. The meaning of “preferably smaller than Y” is included.
- X or more” X is an arbitrary number
- Y or less Y is an arbitrary number
- a “sheet” is a product that is thin by definition in JIS and whose thickness is small and flat for the length and width.
- a “film” is compared to the length and width.
- a thin flat product whose thickness is extremely small and whose maximum thickness is arbitrarily limited, and is usually supplied in the form of a roll (Japanese Industrial Standard JISK6900).
- JISK6900 Japanese Industrial Standard
- the boundary between the sheet and the film is not clear and it is not necessary to distinguish the two in terms of the present invention, in the present invention, even when the term “film” is used, the term “sheet” is included and the term “sheet” is used. In some cases, “film” is included.
- ⁇ Flame retardance test> Using a sample for evaluation of 200 mm in length x 50 mm in width (thickness varies depending on each test piece), a combustion test was conducted at 5 times based on the safety standard UL94 thin material vertical combustion test procedure of Underwriters Laboratories. It was carried out, and the state of combustion (particularly the presence or absence of drops during combustion) was observed, and the combustion time (total combustion time of 5 tests) was measured.
- a sample having a width of 10 mm was used as an evaluation sample, and a 180 ° C. peeling test was performed at an atmospheric temperature of 23 ° C., a humidity of 50%, and a peeling speed of 10 mm / min. And the thing whose peeling strength is 150 g / 10mm or more was evaluated as an acceptable product.
- a 700 mm thick slice was taken from the adhesive film (sample adhesive film) obtained in the examples and comparative examples, and observed with a scanning electron microscope at a magnification of 2000 times, and the actual size was 30 ⁇ m ⁇ 30 ⁇ m in a size of 1 ⁇ m.
- the number of the above voids was measured, and the case where the number of voids was 5 or less was determined as “unfoamed state”, and the case where the number of voids was more than 5 was determined as “foamed state”.
- Examples 1-1 to 1-15 and Comparative Examples 1-1 to 1-5 ⁇ Examples 1-1 to 1-15 and Comparative Examples 1-1 to 1-5> Next, the raw materials used in Examples 1-1 to 1-15 and Comparative Examples 1-1 to 1-5, that is, the thermosetting adhesive resin composition (A), the phosphorus compound (B), and foaming The agent (C) will be described.
- Thermosetting adhesive resin composition (A) -1 EPU-11 (urethane-modified epoxy resin) manufactured by ADEKA and Versamide 115 (polyamideamine, amine value 240) manufactured by Cognis Japan at a mixing mass ratio of 20:80 Mixed liquid epoxy adhesive resin.
- Thermosetting adhesive resin composition (A) -2 ADEKA EPU-11 (urethane-modified epoxy resin) and Cognis Japan Versamide 115 (polyamideamine, amine value 240) in a mixing mass ratio of 40:60 Mixed liquid epoxy adhesive resin.
- Phosphorus compound (B) -1 EXOLIT OP930 manufactured by Clariant, Inc. (aluminum diethylphosphinate, average particle size 5 ⁇ m, specific surface area 13 m 2 / g, solid state at 250 ° C.)
- Phosphorus compound (B) -2 EXOLIT OP1230 manufactured by Clariant, Inc.
- Phosphorus compound (B) -3 SP-703H (condensed phosphoric ester amide, average particle size: 1.6 ⁇ m, melting temperature: 180 ° C.) manufactured by Shikoku Kasei Kogyo Co., Ltd.
- the said melting temperature of a phosphorus compound (B) is the value measured as follows. About 10 mg of a phosphorus compound is sampled and used as a test sample. Using a differential scanning calorimeter (DSC-7 manufactured by PerkinElmer), the test sample is -10 ° C / min from -40 ° C to 250 ° C based on JIS-K7121. The temperature rise was measured at a speed. At this time, a series of measurements were performed in a nitrogen atmosphere. The melting temperature was read from the obtained thermogram. Further, the sample in which no melting peak was obtained was judged as “solid state at 250 ° C.”.
- Foaming agent (C) -1 Cellmic C-2 manufactured by Sankyo Kasei Co., Ltd. (endothermic foaming agent, azodicarbonamide foaming agent, decomposition temperature: 204 ° C.)
- Foaming agent (C) -2 Cell microphone 417 manufactured by Sankyo Kasei Co., Ltd. (endothermic foaming agent, inorganic foaming agent, decomposition temperature: 208 ° C.)
- Example 1-1 The thermosetting adhesive resin composition (A) -1, the phosphorus compound (B) -1, and the foaming agent (C) -1 are heated at 120 ° C. in a mixing mass ratio of 55/40/5. The mixture was melt-mixed to obtain an adhesive resin composition. Next, the obtained adhesive resin composition was hot-pressed at 120 ° C. to obtain a plurality of 30 ⁇ m-thick adhesive films.
- a part of the obtained adhesive film (thickness 30 ⁇ m) was sandwiched between two polyethylene terephthalate films with a thickness of 38 ⁇ m from both sides, and then hot pressed at 120 ° C. to obtain a laminated film with a total layer of 100 ⁇ m.
- the biaxially stretched film manufactured as follows was used for said polyethylene terephthalate film.
- Novapex IV: 0.65 manufactured by Mitsubishi Chemical Corporation as the polyethylene terephthalate resin
- Novapex was kneaded at 260 ° C with a 40 mm ⁇ single screw extruder, then extruded from the die, and then rapidly cooled with a casting roll at about 40 ° C.
- An amorphous sheet having a thickness of 342 ⁇ m was prepared.
- the paper is passed through a sequential biaxial tenter manufactured by Mitsubishi Heavy Industries, Ltd., and stretched at 95 ° C. in the MD (longitudinal direction) at a stretch ratio of 3 times, and subsequently at 110 ° C. in the TD (transverse direction) at a stretch ratio of 3
- the film was stretched twice, and then heat-treated at 160 ° C. for 15 seconds to obtain a biaxially stretched film having a thickness of 38 ⁇ m.
- the adhesive film and the laminated film obtained as described above were each allowed to stand in a baking test apparatus (DKS-5S manufactured by Daiei Kagaku Seisaku Seisakusho) and heat-treated at 80 ° C. for 24 hours.
- the adhesive film thus obtained is subjected to a flame retardancy test and the foaming agent is checked for foaming / non-foaming, while the obtained laminated film is evaluated for flame retardancy and has a peel strength. Evaluation was performed and the results are shown in Table 1.
- Example 1-2 Thermosetting adhesive resin composition (A) -1, phosphorus compound (B) -2, and foaming agent (C) -1 are melt-mixed at a mass ratio of 55/40/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was prepared. The results are shown in Table 1.
- Example 1-3 A thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -1, and a foaming agent (C) -2 are melt-mixed at a mass ratio of 55/40/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -1, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 70/25/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -1, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 45/50/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -1, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 57/40/3 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -2, a phosphorus compound (B) -1, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 55/40/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -1, and a foaming agent (C) -3 are melt-mixed at a mass ratio of 55/40/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- Example 1-9 Thermosetting adhesive resin composition (A) -1, phosphorus compound (B) -1 and foaming agent (C) -1 are melt-mixed at a mass ratio of 80/15/5 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- Example 1-10 Thermosetting adhesive resin composition (A) -1, phosphorus compound (B) -1, and foaming agent (C) -1 are melt-mixed at a mass ratio of 59.8 / 40 / 0.2. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the adhesive resin composition was manufactured. The results are shown in Table 1.
- Example 1-11 Thermosetting adhesive resin composition (A) -1, phosphorus compound (B) -1, and foaming agent (C) -1 are melt-mixed at a mass ratio of 51/40/9 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -3, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 47/50/3 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- thermosetting adhesive resin composition (A) -1, a phosphorus compound (B) -4, and a foaming agent (C) -1 are melt-mixed at a mass ratio of 47/50/3 to form an adhesive. Samples were prepared and evaluated in the same manner as in Example 1-1 except that the resin composition was manufactured. The results are shown in Table 1.
- Example 1-14 Samples were prepared and evaluated in the same manner as in Example 1-1 except that a polycarbonate film was used instead of the polyethylene terephthalate film. The results are shown in Table 1.
- the unstretched film manufactured as follows was used for said polycarbonate film.
- Iupilon H-3000 manufactured by Mitsubishi Engineering Plastics Co., Ltd. is used as the polycarbonate resin.
- Iupilon H-3000 is kneaded at 260 ° C. with a 40 mm ⁇ single screw extruder, then extruded from the die, and then rapidly cooled with a casting roll at about 120 ° C.
- An unstretched film having a thickness of 38 ⁇ m was obtained.
- Example 1-15 In Example 1-1, one of a set of polyethylene terephthalate films was changed to MRF38 (single-sided silicone release-treated polyethylene terephthalate film, thickness 38 ⁇ m) manufactured by Mitsubishi Chemical Polyester Co., Ltd., and an adhesive film (thickness 30 ⁇ m) was used. The film was sandwiched between two polyethylene terephthalate films (one MRF38) having a thickness of 38 ⁇ m and then hot-pressed at 120 ° C. to obtain a laminated film having a total layer of 100 ⁇ m. Table 1 shows the results of the same evaluation as in Example 1-1 for the laminated film of 62 ⁇ m in all layers obtained by peeling MRF38 from the obtained laminated film.
- MRF38 single-sided silicone release-treated polyethylene terephthalate film, thickness 38 ⁇ m
- an adhesive film thickness 30 ⁇ m
- thermosetting adhesive resin composition (A) -1 and the phosphorus compound (B) -1 were melt-mixed at a mass ratio of 60/40 to produce an adhesive resin composition. Samples were prepared and evaluated in the same manner as in 1-1, and the results are shown in Table 2.
- thermosetting adhesive resin composition (A) -1 and the phosphorus compound (B) -2 were melt-mixed at a mass ratio of 60/40 to produce an adhesive resin composition. Samples were prepared and evaluated in the same manner as in 1-1, and the results are shown in Table 2.
- thermosetting adhesive resin composition (A) -1 and the foaming agent (C) -1 were melt mixed at a mass ratio of 95/5 to produce an adhesive resin composition. Samples were prepared and evaluated in the same manner as in -1, and the results are shown in Table 2.
- thermosetting adhesive resin composition (A) and the phosphorus compound (B) are compared with the comparative example lacking either the phosphorus compound (B) or the foaming agent (C).
- Examples 1-1 to 1-13 containing the foaming agent (C) were all excellent in flame retardancy, and it was found that all could be evaluated as acceptable products.
- any adhesive film of Example 1-13 had a thickness of 30 ⁇ m, and was a film that was much thinner than 1 mm.
- the content of the flame retardant adhesive composition is preferably 10 to 70% by mass, more preferably 30 to 60% by mass, especially 40 to 40% by mass. It was found that 55% by mass is more preferable.
- the specific surface area of the phosphorus compound (B) is in the range of 1 m 2 / g to 50 m 2 / g, preferably in the range of 5 m 2 / g to 20 m 2 / g, from the viewpoint of flame retardancy and moldability. It is thought that it is good.
- the decomposition temperature is preferably 190 ° C. or higher, particularly 195 to It has been found that it is preferable to use a foaming agent at 300 ° C., particularly 200 to 250 ° C.
- the blending amount of the foaming agent (C) is determined in terms of flame retardancy, adhesiveness, mechanical properties (film strength, etc.), etc. From the results, it was found that blending at a ratio of 0.1 to 10% by mass, particularly 1 to 8% by mass, especially 3 to 5% by mass is further preferable.
- the thickness of the flame-retardant resin laminated film from Examples 1-1 to 1-13 and experience carried out in other than these examples, even if the total thickness of the flame-retardant resin laminated film is 500 ⁇ m or less, It has been found that if the ratio of the thickness of the adhesive film to the total thickness is 20 to 70%, flame retardancy can be obtained. Further, from the results of Examples 1-14 and 1-15, the film laminated on the flame retardant adhesive composition layer comprising the present flame retardant adhesive composition is the same even if it is a resin film of PET or less. It was confirmed that the effect was obtained.
- Examples 2-1 to 2-9 and Comparative Examples 2-1 to 2-4 ⁇ Examples 2-1 to 2-9 and Comparative Examples 2-1 to 2-4> Next, the raw materials used in Examples 2-1 to 2-9 and Comparative Examples 2-1 to 2-4, that is, epoxy resin (a), polyamidoamine (b), phosphorus compound (B), and foam The agent (C) will be described.
- Epoxy resin (a) -1 ADEKA EPU-11 (liquid urethane-modified epoxy resin)
- Polyamideamine (b) -1 Versamide 100 (liquid polyamidoamine, amine value: 90) manufactured by Cognis Japan Polyamidoamine (b) -2: Versamide 115 (liquid polyamidoamine, amine value: 240) manufactured by Cognis Japan Polyamidoamine (b) -3: Versamide 125 (liquid polyamidoamine, amine value: 350) manufactured by Cognis Japan
- the “amine value of (b)” shown in the table is the amine value of the mixture, that is, the “amine value” of each polyamidoamine when a mixture of two polyamidoamines is used as the polyamidoamine (b).
- Value ⁇ mixing ratio ” (for example, 90 ⁇ 10/38 + 240 ⁇ 28/38 in Example 2-1).
- Phosphorus compound (B) -1 EXOLIT OP930 manufactured by Clariant (aluminum diethylphosphinate, average particle size: 5 ⁇ m, solid state at 250 ° C.)
- Phosphorus compound (B) -2 SP-703H (condensed phosphoric ester amide, average particle size: 1.6 ⁇ m, melting temperature: 180 ° C.) manufactured by Shikoku Kasei Kogyo Co., Ltd.
- Foaming agent (C) -1 Cell microphone 417 manufactured by Sankyo Kasei Co., Ltd. (endothermic foaming agent, inorganic foaming agent, decomposition temperature: 208 ° C.)
- Foaming agent (C) -2 Sankyo Kasei Co., Ltd. Cellmic C-2 (endothermic foaming agent, addicarbonamide, decomposition temperature 204 ° C.)
- Example 2-1 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and blowing agent (C) -1 were mixed at a mass ratio of 15/10/28. The mixture was melted under heating at 120 ° C. at a ratio of / 45/2 to obtain an adhesive resin composition. Next, the obtained adhesive resin composition was hot-pressed at 120 ° C. to obtain an adhesive film having a thickness of 30 ⁇ m.
- a part of the obtained adhesive film (thickness 30 ⁇ m) was sandwiched between two polyethylene terephthalate films with a thickness of 38 ⁇ m from both sides, and then hot pressed at 120 ° C. to obtain a laminated film with a total layer of 100 ⁇ m.
- the biaxially stretched film manufactured as follows was used for said polyethylene terephthalate film.
- this Novapex (IV: 0.65) manufactured by Mitsubishi Chemical Corporation as the polyethylene terephthalate resin
- this Novapex was kneaded at 260 ° C. with a 40 mm ⁇ single-screw extruder, then extruded from the die, and then rapidly cooled with a casting roll at about 40 ° C.
- an amorphous sheet having a thickness of 342 ⁇ m was produced.
- the paper is passed through a sequential biaxial tenter manufactured by Mitsubishi Heavy Industries, Ltd., and stretched at 95 ° C.
- the film was stretched twice, and then heat-treated at 160 ° C. for 15 seconds to obtain a biaxially stretched film having a thickness of 38 ⁇ m.
- the adhesive film and the laminated film obtained as described above were each allowed to stand in a baking test apparatus (DKS-5S manufactured by Daiei Kagaku Seisaku Seisakusho) and heat-treated at 80 ° C. for 24 hours.
- the adhesive resin composition obtained in the above production process is evaluated for fluidity, and the adhesive film is checked for foaming / non-foaming of the foaming agent and subjected to a flame retardancy test.
- the film was evaluated for peel strength as well as flame retardancy, and the results are shown in Table 3.
- Example 2-2 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and blowing agent (C) -1 were mixed at a mass ratio of 10/10/18 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 60/2. The results are shown in Table 3.
- Example 2-3 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and blowing agent (C) -1 were mixed at a mass ratio of 15/10/26 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/4. The results are shown in Table 3.
- Example 2-4 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -3, phosphorus compound (B) -1 and blowing agent (C) -1 were mixed at a mass ratio of 15/23/15 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/2. The results are shown in Table 3.
- Example 2-5 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and foaming agent (C) -1 were mixed at a mass ratio of 10/5/38 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/2. The results are shown in Table 3.
- Example 2-6 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and blowing agent (C) -1 were mixed at a mass ratio of 10/38/5 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/2. The results are shown in Table 3.
- Example 2--7 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and foaming agent (C) -1 were mixed at a mass ratio of 30/10/13 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/2. The results are shown in Table 3.
- Example 2-8 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -2 and blowing agent (C) -1 were mixed at a mass ratio of 10/10/18 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 60/2. The results are shown in Table 3.
- Example 2-9 Epoxy resin (a) -1, polyamidoamine (b) -1, polyamidoamine (b) -2, phosphorus compound (B) -1 and foaming agent (C) -2 were mixed at a mass ratio of 15/10/28 / A sample was prepared and evaluated in the same manner as in Example 2-1, except that an adhesive resin composition was prepared by mixing and melting at a ratio of 45/2. The results are shown in Table 3.
- Example 2-4 Cognis Japan Versamide 150 (polyamidoamine, amine value 385) was used, epoxy resin (a) -1, polyamidoamine (b) -1, versamide 150, phosphorus compound Example (B) -1 and foaming agent (C) -1 were the same as Example 2-1 except that an adhesive resin composition was prepared by mixing and melting at a mass ratio of 15/10/28/45/2. Samples were prepared and evaluated by this method. The results are shown in Table 4.
- thermosetting adhesive resin composition (A) and the phosphorus compound (B) are compared with the comparative example lacking either the phosphorus compound (B) or the foaming agent (C).
- Examples 2-1 to 2-9 containing the foaming agent (C) were found to be excellent in flame retardancy and all evaluated as acceptable products.
- any of the adhesive films of Examples 2-1 to 2-9 had a thickness of 30 ⁇ m, and was a film extremely thinner than 1 mm.
- a flame retardant adhesive composition is obtained by using a polyamidoamine (b) having an amine value of 100 to 225. It was found that not only can the film be produced efficiently, but also the followability of the obtained film is increased, so that the film can be laminated without causing wrinkles. . From the results of Examples 2-1 to 2-9 and other examples, it was found that the amine value of polyamidoamine (b) is preferably 130 to 180, more preferably 150 to 200. It was.
- the ratio of the polyamidoamine (b) in the thermosetting adhesive resin composition (A) has an appropriate fluidity. From the viewpoint of obtaining, it was found that the content is preferably 30 to 90% by mass, particularly 40 to 80% by mass, and more preferably 50 to 70% by mass. Furthermore, from Examples 2-1 to 2-9 and experience other than those examples, polyamidoamine ( ⁇ -1) having an amine value of 50 to 95 and polyamidoamine having an amine value of 230 to 360 ( ⁇ - 2), the ratio of the polyamidoamine ( ⁇ -1) to the polyamidoamine ( ⁇ -2) is 10 to 10% of the total polyamidoamine (b).
- the content was preferably 90% by mass, particularly 20 to 80% by mass, and more preferably 30 to 70% by mass.
- the specific surface area of the phosphorus compound (B) is in the range of 1 m 2 / g to 50 m 2 / g, preferably in the range of 5 m 2 / g to 20 m 2 / g, from the viewpoint of flame retardancy and moldability. It is thought that it is good.
- phosphinic acid salts such as aluminum diethylphosphinate were used as phosphorus compounds (B) compared to other phosphorus compounds. From the viewpoint that flame retardancy can be obtained even at a low concentration, it has been found preferable. Further, from Examples 2-1 to 2-9 and experience other than those examples, regarding the blending amount of the phosphorus compound (B), imparting flame retardancy, mechanical properties such as film strength, and further molding From the viewpoint of increase in viscosity at the time, the content of the flame retardant adhesive composition is preferably 30 to 70% by mass, more preferably 35 to 60% by mass, especially 40 to 50%. It turned out that it is more preferable that it is the mass%.
- the decomposition temperature is preferably 190 ° C. or higher, particularly 195 to It has been found that it is preferable to use a foaming agent at 300 ° C., particularly 200 to 250 ° C.
- the blending amount of the foaming agent (C) is determined in terms of flame retardancy, adhesiveness, mechanical properties (film strength, etc.), etc.
- the flame retardant adhesive composition is preferably blended in the flame retardant adhesive composition in a proportion of 0.1 to 5% by mass, particularly in a proportion of 0.5 to 4% by mass, particularly in a proportion of 1 to 3% by mass. It has been found that it is more preferable to do this.
- the thickness of the flame retardant resin laminated film from Examples 2-1 to 2-9 and experience conducted in other than these examples, even if the total thickness of the flame retardant resin laminated film is 500 ⁇ m or less, It has been found that if the ratio of the thickness of the adhesive film to the total thickness is 20 to 80%, flame retardancy can be obtained.
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Abstract
Description
よって、本発明の難燃性接着剤組成物は、これを用いてなる接着剤組成物層の厚さが小さくても十分な難燃性を付与することができるし、また、ポリエチレンテレフタレートなどの非難燃性樹脂からなる層の少なくとも片面に、本発明の難燃性接着剤組成物からなる接着剤組成物層を積層して積層フィルムを形成することにより、十分な難燃性を積層フィルムに付与することができる。
本難燃性接着剤組成物は、熱硬化型接着性樹脂組成物(A)、リン系化合物(B)、及び、未発泡状態の発泡剤(C)を含有してなる難燃性接着剤組成物である。
熱硬化型接着性樹脂組成物(A)は、熱硬化性樹脂を主成分とする接着性樹脂組成物であればよく、このような熱硬化性樹脂としては、例えばエポキシ樹脂、フェノール樹脂、不飽和ポリエステル樹脂、ポリウレタン樹脂、シリコーン、ポリイミド樹脂、フッ素樹脂、ユリア樹脂、メラミン樹脂、レゾシノール樹脂などを挙げることができる。中でも、接着性、耐熱性、コスト等のバランスからエポキシ樹脂及び硬化剤を主成分とするエポキシ系接着剤組成物が好ましい。
商業的に入手可能なエポキシ樹脂としては、ジャパンエポキシレジン社製「827、828、828EL、834」、ADEKA社製「アデカレジン」シリーズ、スリーボンド社製「スリーボンド2000」シリーズ等を挙げることができる。
商業的に入手可能なエポキシ樹脂の硬化剤としては、ジャパンエポキシレジン社製「ST」シリーズ、日立化成工業社製「HN-2200、HN-2000、HN-5500」、スリーボンド社製「スリーボンド2105C」、コグニスジャパン社製「バーサミド」シリーズ等を挙げることができる。
硬化剤として用いるポリアミドアミンは、アミン価が50~350のものが好ましく、特に80~300のものがより好ましく、中でも100~225のポリアミドアミンを用いるのが好ましい。
アミン価が100~225のポリアミドアミンをエポキシ樹脂の硬化剤として用いることにより、難燃性接着剤組成物の粘度が適度になって流動性が高まるため、フィルムを効率良く製造することができるばかりか、得られたフィルムの追随性が高まるため、皺を生じさせることなく積層することができる。かかる観点から、ポリアミドアミンのアミン価は、130~180であるのがより好ましく、さらに好ましくは150~200である。
2種類以上のポリアミドアミンの混合物を用いる場合には、混合物としてのアミン価、すなわち各ポリアミドアミンの「アミン価×混合比率」の合計値を上記範囲に調整するのが好ましい。
ポリアミドアミン(β-1)により、優れた硬化性、2次加工性(折り曲げ、うち抜き)を付与することができる一方、ポリアミドアミン(β-2)により、優れた接着性、可撓性を付与することができるから、硬化性、2次加工性、接着性および可撓性をバランス良く高めることができる。
このような観点から、ポリアミドアミン(β-1)のアミン価は70~93であるのがさらに好ましく、特に80~90であるのがより一層好ましい。他方、ポリアミドアミン(β-2)のアミン価は230~320であるのがさらに好ましく、特に230~280であるのがより一層好ましい。
商業的に入手可能なポリアミドアミンとしては、コグニスジャパン社製「バーサミド」シリーズ、三洋化成工業社製「ポリマイド」シリーズ、DIC社製「ラッカマイド」シリーズ等を用いることができ、それぞれアミン価の異なるグレードのポリアミドアミンを入手することができる。
そのほか、接着性樹脂組成物に通常配合する他の添加剤を配合することは任意である。
なお、エポキシ樹脂及び硬化剤のほかに、接着性樹脂組成物に通常配合する他の添加剤を配合することは任意である。
リン系化合物(B)は、リンを含有する化合物であって、融解温度が170℃以上である化合物であるのが好ましい。但し、融解温度が170℃以上であるリン系化合物には、より高温(例えば250℃付近)で固体状態にあるリン系化合物が包含されるものとする。
本難燃性接着剤組成物は、原料混合工程を含めた製造工程において120~150℃程度に加熱されるため、融解温度が170℃より低いと、難燃性が悪くなるばかりか、リン系化合物が溶融して熱硬化型接着性樹脂組成物(A)と相分離する可能性がある。よって、リン系化合物(B)の融解温度は170℃以上であるのが好ましい。
さらに、本難燃性接着剤組成物は190℃以上に加熱しながら加工したり、或いは加工時に190℃以上にエージング処理したりすることが想定されるため、融解温度が190℃以上であるリン系化合物(B)を用いることにより、このような加工時においても、熱硬化型接着性樹脂組成物(A)との相分離や、リン系化合物の成形品表面へのブリードアウトを抑制することができる。よって、リン系化合物(B)としては、融解温度が190℃以上であるリン系化合物を用いることがより好ましい。但し、融解温度が190℃以上であるリン系化合物には、より高温(例えば250℃付近)で固体状態にあるリン系化合物が包含されるものとする。
商業的に入手可能なホスフィン酸塩としては、例えばクラリアントジャパン社製EXOLIT OP1230、930、935、縮合リン酸エステルアミドとしては、四国化成工業社製SP703H、ポリリン酸アンモニウムとしては、CHITEC社製ZURAN484を挙げることができる。
リン系化合物(B)の比表面積が、5m2/g以上であれば十分な難燃性を付与することが可能であり、20m2/g以下であれば粘度上昇に伴う分散不良、成形不良等の問題を生じることがない。
かかる範囲で、リン系化合物(B)、特にホスフィン酸塩を配合すれば、リン系化合物(B)が少な過ぎて難燃性が得られないことがない一方、リン系化合物(B)が多過ぎて、機械物性、例えばフィルム強度などが低下したり、成形時に粘度が過度に上昇したりすることもないから、好ましい。
発泡剤(C)は、未発泡状態で本難燃性接着剤組成物に含有されていることが重要である。本難燃性接着剤組成物が未発泡状態の発泡剤を含有していれば、本難燃性接着剤組成物を加熱して燃焼させた時に、発泡剤が速やかに分解して発泡し、分解時の吸熱作用と、窒素或いは二酸化炭素等の不活性ガスによる可燃性ガスの希釈効果とによって、難燃性を高めることができる。しかも、発泡によって断熱層が形成されるため、格別に優れた難燃性を実現することができる。
定量的に判断する場合には、例えば本難燃性接着剤組成物からなる成形物(フィルムや膜含む)から厚さ700Åの薄片を採取し、走査型電子顕微鏡により2000倍にて観察し、実寸法30μm×30μmのサイズ内に1μm以上の空隙が幾つ存在するかを計測し、空隙の数が5個以下となるものを「未発泡状態」と判定することができる。
このような吸熱型発泡剤としては、例えば炭酸水素ナトリウムや炭酸マグネシウム等の無機物を主成分とする無機系発泡剤、或いは、アゾジカルボンアミドを主成分とする有機系発泡剤を挙げることができる。
理想的には、発泡剤(C)が発泡した際に発熱される熱によってリン系化合物(B)の炭化反応が促進されるのが好ましい。よって、発泡剤の分解温度が高過ぎると、発泡剤(C)が発泡する前に、リン系化合物(B)が炭化することになるため、発泡剤(C)の分解温度は350℃以下であるのが好ましい。
このような点を総合すると、発泡剤(C)の分解温度は190~350℃であるのが好ましく、中でも195℃以上或いは300℃以下であるのがより好ましく、その中でも特に200℃以上或いは250℃以下であるのがより好ましい。
なお、発泡剤(C)の分解温度は、例えばRIGAKU社製Thermo Plus TG8120を用いて、発泡剤10mgを昇温速度5℃/分、窒素雰囲気下で加熱し、重量が1%減少した時の温度を分解温度として計測することができる。
中でも、炭酸水素ナトリウム及びアゾジカルボンアミドの何れか、又は、これらの混合物を用いるのが好ましい。
かかる範囲で発泡剤(C)を配合することにより、機械物性(例えばフィルムの強度)を低下させることなく、優れた接着性と難燃性を付与することができる。
本難燃性接着剤組成物は、熱硬化型接着性樹脂組成物(A)、リン系化合物(B)、発泡剤(C)及びその他添加剤を混合溶融させて製造することができる。この際、必要に応じて、樹脂の種類、反応性に応じて適宜選択して加熱しながら混合を行うのが好ましい。
但し、加熱温度は少なくとも発泡剤(C)の分解温度より低温とする必要があり、中でもリン系化合物(B)の融解温度より低温とするのがさらに好ましく、特に130℃以下とするのがより一層好ましい。また、原材料の混合は、必要に応じて窒素雰囲気下で行なうのが好ましい。
養生(エージング)温度は、少なくとも発泡剤(C)の分解温度より低温である必要があり、さらにリン系化合物(B)の融解温度より低温であるのが好ましく、特に130℃以下であるのがより好ましい。また、必要に応じて窒素雰囲気下で行なうのが好ましい。
本難燃性接着剤組成物は、燃焼時に、リン系化合物(B)の炭化反応と共に発泡剤(C)が発泡して断熱層を形成するため、従来、難燃化が困難であった非難燃性樹脂層に、本難燃性接着剤組成物からなる層を積層することによって、優れた難燃性を付与することができる。
この際、非難燃性樹脂層は、例えばオリフィン系樹脂、ポリエチレンテレフタレート、スチレン系樹脂等のように、難燃性樹脂とは認められない非難燃性樹脂から形成することができる。
但し、加工する際の加熱温度は、少なくとも発泡剤(C)の分解温度より低温である必要があり、さらにリン系化合物(B)の融解温度より低温であるのが好ましく、特に130℃以下であるのがより好ましい。
このように加工した後、必要に応じて30~100℃で1~24時間熱処理するなどして養生(エージング)してもよい。
また、本積層フィルムは、例えば液晶ディスプレイ、カーナビゲーション、携帯電話、ゲーム機、オーディオプレイヤー、デジタルカメラ、テレビ、電子辞書、ハードディスクレコーダー、ビデオカメラ等の電子機器に配することができる。例えば電子機器の電池に配する場合は、電池本体を覆うように配することができる。また、例えばパソコン内に配する場合は、絶縁が求められる箇所に挟むか、或いは、粘着テープ等によって固定することによって配することができる。
本発明において「難燃性接着剤組成物」の「難燃性」とは、UL94垂直燃焼試験UL94VTMの判定基準に基づき、少なくともVTM-2規格を満たすものであり、好ましくはVTM-1規格を満たすもの、中でも好ましくはVTM-0規格を満たすものである。
「難燃性接着剤組成物」の形態は、任意であり、例えば層状、膜状、フィルム状、シート状、パネル状、その他のいずれの形態であってもよい。
「非難燃性樹脂層」とは、UL94垂直燃焼試験UL94VTMの判定基準に基づき、VTM-2規格を満たさないものである。
また、本明細書において、「X~Y」(X,Yは任意の数字)と記載した場合、特にことわらない限り「X以上Y以下」の意であり、「好ましくはXより大きい」或いは「好ましくはYより小さい」の意を包含するものである。
また、「X以上」(Xは任意の数字)或いは「Y以下」(Yは任意の数字)と記載した場合、「Xより大きいことが好ましい」或いは「Y未満であるのが好ましい」旨の意図も包含する。
先ず、実施例の評価方法について説明する。
長さ200mm×幅50mm(厚みはそれぞれの試験片により異なる)の評価用サンプルを用いて、Underwriters Laboratories社の安全標準UL94薄手材料垂直燃焼試験の手順に基づき、試験回数5回にて燃焼試験を実施し、燃焼の様子(特に燃焼中における滴下物の有無)を観察すると共に、燃焼時間(試験回数5回の合計燃焼時間)を測定した。なお、試験中にUL94垂直燃焼試験に定められる標線まで燃焼したものについては、燃焼時間を「標線までの燃焼時間の合計時間以上」と表に記載した。
UL94垂直燃焼試験UL94VTMの判定基準に基づき、VTM-0、1、2の規格を満たすか否か判例し、VTM-2を満たさないものは規格外と評価し、VTM-0を満たすものを合格品と評価した。
実施例及び比較例で得られた接着性フィルム(サンプル接着性フィルム)の剥離強度を次のように試験した。
実施例及び比較例で得られた接着性フィルムを、2枚のポリエチレンテレフタレートフィルムで挟んで積層してなる積層フィルムについて、図1に示すように、片側のポリエチレンテレフタレートフィルムを剥がす際の剥離強度を測定することにより、接着性フィルム(サンプル接着性フィルム)の剥離強度を測定した。但し、実施例1-14では、ポリエチレンテレフタレートフィルムの代わりにポリカーボネートフィルムを積層し、剥離した。
この際、剥離強度の測定は、引張試験機(株式会社インテスコ製:恒温槽付き材料試験器201X)を用いて行なった。評価用サンプルには、10mm幅のものを使用し、雰囲気温度23℃、湿度50%、剥離速度10mm/分で180℃剥離試験を実施した。そして、剥離強度が150g/10mm以上のものを合格品と評価した。
実施例・比較例で得た接着性フィルム(サンプル接着性フィルム)から厚さ700Åの薄片を採取し、走査型電子顕微鏡により2000倍にて観察し、実寸法30μm×30μmのサイズ内に、1μm以上の空隙が幾つ存在するかを計測し、空隙の数が5個以下の場合を「未発泡状態」、空隙の数が5個より多い場合を「発泡状態」と判定した。
レオロジー社製MR-300T(コーンプレート型レオメータ)を用い、コーン半径9mm、コーン角度6.28rad/s、測定温度120℃、測定周波数1Hz、測定時間5分にて、実施例2-1~2-9及び比較例2-1~2-4で得た接着剤樹脂組成物の粘度測定を行ない、結果を表3及び表4に示した。
粘度が10,000~50,000mPa・sのものを合格品と評価した。
次に、実施例1-1~1-15及び比較例1-1~1-5で用いた原料、すなわち熱硬化型接着性樹脂組成物(A)、リン系化合物(B)、及び、発泡剤(C)について説明する。
熱硬化型接着性樹脂組成物(A)-2:ADEKA社製EPU-11(ウレタン変性エポキシ樹脂)と、コグニスジャパン社製バーサミド115(ポリアミドアミン、アミン価240)を混合質量比40:60で混合した液状のエポキシ系接着性樹脂。
リン系化合物(B)-2:クラリアント社製EXOLIT OP1230(ジエチルホスフィン酸アルミニウム、平均粒径5~40μm、250℃で固体状態)
リン系化合物(B)-3:四国化成工業社製SP-703H(縮合リン酸エステルアミド、平均粒径:1.6μm、融解温度:180℃)
リン系化合物(B)-4:CHITEC社製ZURAN484(ポリリン酸アンモニウム、平均粒径:8μm、融解温度:280℃)
リン系化合物を10mg程度採取して試験サンプルとし、示差走査熱量計(パーキンエルマー製DSC-7)を用いて、JIS-K7121に基づき、試験サンプルを-40℃から250℃まで10℃/分の速度にて昇温測定を行った。この際、一連の測定は窒素雰囲気下にて行なった。
得られたサーモグラムより融解温度を読み取った。また、融解ピークが得られなかったサンプルは、「250℃で固体状態」と判断した。
発泡剤(C)-2:三協化成社製セルマイク417(吸熱型発泡剤、無機系発泡剤、分解温度:208℃)
発泡剤(C)-3:永和化成工業社製セルテトラP5T(吸熱型発泡剤、5-フェニールテトラゾール、分解温度260℃)
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を混合質量比55/40/5の割合で、120℃の加熱下で溶融混合して接着剤樹脂組成物を得た。次に、得られた接着剤樹脂組成物を120℃で熱プレスし、厚み30μmの接着性フィルムを複数枚得た。
ポリエチレンテレフタレート樹脂として三菱化学社製ノバペックス(IV:0.65)を用い、ノバペックスを40mmφ単軸押出機にて260℃で混練した後、口金から押出し、次いで約40℃のキャスティングロールにて急冷し、厚さ342μmの非晶シートを作製した。次いで、三菱重工株式会社製逐次2軸テンターに通紙し、95℃でMD(長手方向)に延伸倍率で3倍に延伸を行い、続いて110℃でTD(横手方向)に延伸倍率で3倍に延伸を行い、さらにその後、160℃で15秒熱処理を行い、厚さ38μmの二軸延伸フィルムを得た。
このようにして得られた接着性フィルムについて、難燃性試験を行うと共に発泡剤の発泡・未発泡の確認を行う一方、得られた積層フィルムについては、難燃性の評価と共に、剥離強度の評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-2、及び、発泡剤(C)-1を、質量比55/40/5の割合で溶融混合して接着剤樹脂組成物を作製した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-2を、質量比55/40/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比70/25/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比45/50/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比57/40/3の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-2、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比55/40/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-3を、質量比55/40/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比80/15/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比59.8/40/0.2の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、発泡剤(C)-1を、質量比51/40/9の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-3、及び、発泡剤(C)-1を、質量比47/50/3の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-4、及び、発泡剤(C)-1を、質量比47/50/3の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
ポリエチレンテレフタレートフィルムの代わりに、ポリカーボネートフィルムを用いた以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表1に示した。
ポリカーボネート樹脂として三菱エンジニアリングプラスチックス社製ユーピロンH-3000を用い、ユーピロンH-3000を40mmφ単軸押出機にて260℃で混練した後、口金から押出し、次いで約120℃のキャスティングロールにて急冷し、厚さ38μmの無延伸フィルムを得た。
実施例1-1において、1組のポリエチレンテレフタレートフィルムのうちの1枚を三菱化学ポリエステル社製MRF38(片面シリコーン離型処理ポリエチレンテレフタレートフィルム、厚み38μm)に変更し、接着性フィルム(厚み30μm)を、厚み38μmの2枚のポリエチレンテレフタレートフィルム(1枚はMRF38)で両側から挟んだ後、120℃で熱プレスし、全層100μmの積層フィルムを得た。
得られた積層フィルムからMRF38を剥がした全層62μmの積層フィルムについて実施例1-1と同様の評価を行った結果を表1に示した。
熱硬化型接着性樹脂組成物(A)-1、及び、リン系化合物(B)-1を、質量比60/40の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表2に示した。
熱硬化型接着性樹脂組成物(A)-1、及び、リン系化合物(B)-2を、質量比60/40の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表2に示した。
熱硬化型接着性樹脂組成物(A)-1、及び、発泡剤(C)-1を、質量比95/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表2に示した。
発泡剤の代わりに、難燃化助剤として使用されている昭和電工社製ハイジライトH-34(水酸化アルミニウム)を用い、熱硬化型接着性樹脂組成物(A)-1、リン系化合物(B)-1、及び、ハイジライトH-34を、質量比45/25/30の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表2に示した。
リン系化合物(B)-1の代わりに、大八化学社PX-200(縮合リン酸エステル、融解温度92℃)を用い、接着性樹脂(A)-1、PX-200、及び、発泡剤(C)-1を、質量比55/40/5の割合で溶融混合して接着剤樹脂組成物を製造した以外は実施例1-1と同様の方法でサンプルの作製、及び、評価を行ない、結果を表2に示した。
発泡剤を使用した実施例及び比較例(実施例1-1~1-13、比較例1-3及び1-5)で得た接着性フィルムについて、発泡剤の発泡・未発泡の判定を行ったところ、いずれの接着性フィルムも、フィルム内の発泡剤は「未発泡状態」であることが確認された。
また、実施例1-1~1-13並びにこれらの実施例以外で実施した経験から、リン系化合物(B)としては、他のリン系化合物に比べて、低濃度でも難燃性を得ることができるという観点から、ジエチルホスフィン酸アルミニウムなどのホスフィン酸塩が好ましいことが分かった。
さらにまた、実施例1-1~1-13並びにこれらの実施例以外で実施した経験から、リン系化合物(B)の配合量に関しては、難燃性付与、機械物性、例えばフィルム強度、さらには成形時における粘度上昇などの観点から、本難燃性接着剤組成物中の10~70質量%の含有量であるのが好ましく、特に30~60質量%であるのがより好ましく、中でも40~55質量%であるのがさらに好ましいことが分かった。
なお、リン系化合物(B)の比表面積は、難燃性および成形性の観点より、1m2/g~50m2/gの範囲内、好ましくは5m2/g~20m2/gの範囲内であるのがよいと考えられる。
同じく実施例1-1~1-13並びにこれらの実施例以外で実施した経験から、発泡剤(C)の配合量は、難燃性、接着性、機械物性(フィルムの強度等)などの観点から、0.1~10質量%、特に1~8質量%の割合、中でも特に3~5質量の割合で配合することがさらに好ましいことが分かった。
また、実施例1-14及び1-15の結果から、本難燃性接着剤組成物からなる難燃性接着剤組成物層に積層するフィルムは、PET以下の樹脂フィルムであっても同様の効果が得られることが確認できた。
次に、実施例2-1~2-9及び比較例2-1~2-4で用いた原料、すなわちエポキシ樹脂(a)、ポリアミドアミン(b)、リン系化合物(B)、及び、発泡剤(C)について説明する。
ポリアミドアミン(b)-2:コグニスジャパン社製バーサミド115(液状のポリアミドアミン、アミン価:240)
ポリアミドアミン(b)-3:コグニスジャパン社製バーサミド125(液状のポリアミドアミン、アミン価:350)
なお、表に示した「(b)のアミン価」は、ポリアミドアミン(b)として2種類のポリアミドアミンの混合物を用いた場合には、混合物としてのアミン価、すなわち、各ポリアミドアミンの「アミン価×混合比率」の合計値(例えば実施例2-1であれば、90×10/38+240×28/38)である。
リン系化合物(B)-2:四国化成工業社製SP-703H(縮合リン酸エステルアミド、平均粒径:1.6μm、融解温度:180℃)
発泡剤(C)-2:三協化成社製セルマイクC-2(吸熱型発泡剤、アドジカルボンアミド、分解温度204℃)
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)―2、リン系化合物(B)-1および発泡剤(C)-1を、混合質量比15/10/28/45/2の割合で、120℃の加熱下で混合溶融して接着剤樹脂組成物を得た。
次に、得られた接着性樹脂組成物を120℃で熱プレスし、厚み30μmの接着性フィルムを得た。
ポリエチレンテレフタレート樹脂として三菱化学社製ノバペックス(IV:0.65)を用い、このノバペックスを40mmφ単軸押出機にて260℃で混練した後、口金から押出し、次いで約40℃のキャスティングロールにて急冷し、厚さ342μmの非晶シートを作製した。次いで、三菱重工株式会社製逐次2軸テンターに通紙し、95℃でMD(長手方向)に延伸倍率で3倍に延伸を行い、続いて110℃でTD(横手方向)に延伸倍率で3倍に延伸を行い、さらにその後、160℃で15秒熱処理を行い、厚さ38μmの二軸延伸フィルムを得た。
上記のようにして得られた接着性フィルム及び積層フィルムを、それぞれベーキング試験装置(大栄科学精器製作所製DKS-5S)内に静置し、80℃で24時間熱処理を行った。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比10/10/18/60/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比15/10/26/45/4の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-3、リン系化合物(B)-1及び発泡剤(C)-1を、質量比15/23/15/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比10/5/38/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比10/38/5/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比30/10/13/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-2及び発泡剤(C)-1を、質量比10/10/18/60/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-2を、質量比15/10/28/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表3に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、リン系化合物(B)-1及び発泡剤(C)-1を、質量比15/38/45/2の割合で混合して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表4に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-2、リン系化合物(B)-1及び発泡剤(C)-1を、質量比15/38/45/2の割合で混合して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表4に示す。
エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、ポリアミドアミン(b)-2、及び、リン系化合物(B)-1を、混合質量比10/10/20/60の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表4に示す。
ポリアミドアミン(b)-2の代わりに、コグニスジャパン社製バーサミド150(ポリアミドアミン、アミン価385)を用い、エポキシ樹脂(a)-1、ポリアミドアミン(b)-1、バーサミド150、リン系化合物(B)-1及び発泡剤(C)-1を、質量比15/10/28/45/2の割合で混合溶融して接着剤樹脂組成物を作製した以外は実施例2-1と同様の方法でサンプルの作製、及び、評価を行なった。結果を表4に示す。
実施例2-1~2-9で得た接着性フィルムについて、発泡剤の発泡・未発泡の確認を行ったところ、いずれの接着性フィルムも、フィルム内の発泡剤は「未発泡状態」であることが確認された。
実施例2-1~2-9並びにこれらの実施例以外で実施した経験から、ポリアミドアミン(b)のアミン価は、好ましくは130~180であり、さらに好ましくは150~200であることが分かった。
さらに、実施例2-1~2-9並びにこれらの実施例以外で実施した経験から、アミン価が50~95のポリアミドアミン(β-1)とアミン価が230~360のポリアミドアミン(β-2)との混合物を用いる場合に、ポリアミドアミン(β-1)とポリアミドアミン(β-2)の割合に関しては、ポリアミドアミン(b)全体に占めるポリアミドアミン(β-1)の割合が10~90質量%であるのが好ましく、特に20~80質量%、中でも特に30~70質量%であるのがより好ましいことが分かった。
なお、リン系化合物(B)の比表面積は、難燃性および成形性の観点より、1m2/g~50m2/gの範囲内、好ましくは5m2/g~20m2/gの範囲内であるのがよいと考えられる。
また、実施例2-1~2-9並びにこれらの実施例以外で実施した経験から、リン系化合物(B)の配合量に関しては、難燃性付与、機械物性、例えばフィルム強度、さらには成形時における粘度上昇などの観点から、本難燃性接着剤組成物中の30~70質量%の含有量であるのが好ましく、特に35~60質量%であるのがより好ましく、中でも40~50質量%であるのがさらに好ましいことが分かった。
同じく実施例2-1~2-9並びにこれらの実施例以外で実施した経験から、発泡剤(C)の配合量は、難燃性、接着性、機械物性(フィルムの強度等)などの観点から、本難燃性接着剤組成物中に0.1~5質量%の割合で配合することが好ましく、特に0.5~4質量%の割合、中でも特に1~3質量%の割合で配合することがさらに好ましいことが分かった。
Claims (14)
- 熱硬化型接着性樹脂組成物(A)、融解温度が170℃以上であるリン系化合物(B)、及び、未発泡状態の発泡剤(C)を含有してなる難燃性接着剤組成物からなる難燃性接着剤組成物層の少なくとも1面に樹脂層を備えた積層フィルム。
- 熱硬化型接着性樹脂組成物(A)は、エポキシ樹脂及び硬化剤を主成分とする樹脂組成物であることを特徴とする請求項1記載の積層フィルム。
- 発泡剤(C)は、吸熱型発泡剤であることを特徴とする請求項1又は2に記載の積層フィルム。
- 発泡剤(C)は、分解温度が190℃以上の発泡剤であることを特徴とする請求項1~3の何れかに記載の積層フィルム。
- リン系化合物(B)は、ホスフィン酸塩であることを特徴とする請求項1~4の何れかに記載の積層フィルム。
- リン系化合物(B)は、ジエチルホスフィン酸アルミニウムであることを特徴とする請求項1~5の何れかに記載の積層フィルム。
- 熱硬化型接着性樹脂組成物(A)は、ウレタン変性エポキシ樹脂、及びポリアミドアミンを主成分とする樹脂組成物であることを特徴とする請求項1~6の何れかに記載の積層フィルム。
- 熱硬化型接着性樹脂組成物(A)は、エポキシ樹脂、及びアミン価が100~225のポリアミドアミンを主成分とする樹脂組成物であることを特徴とする請求項1~7の何れかに記載の積層フィルム。
- 熱硬化型接着性樹脂組成物(A)に占めるポリアミドアミンの割合が30~90質量%であることを特徴とする請求項7又は8に記載の積層フィルム。
- ポリアミドアミンが、アミン価が50~95のポリアミドアミン(β-1)と、アミン価が230~360のポリアミドアミン(β-2)との混合物であり、該混合物のアミン価が100~225であることを特徴とする請求項7~9の何れかに記載の積層フィルム。
- 熱硬化型接着性樹脂組成物(A)、融解温度が170℃以上であるリン系化合物(B)、及び、未発泡状態の吸熱型発泡剤(C)を含有してなる難燃性接着剤組成物。
- 熱硬化型接着性樹脂組成物(A)が、ウレタン変性エポキシ樹脂及びポリアミドアミンを主成分とする樹脂組成物であることを特徴とする請求項11に記載の難燃性接着剤組成物。
- 前記ポリアミドアミンが、アミン価が50~95のポリアミドアミン(β-1)と、アミン価が230~360のポリアミドアミン(β-2)との混合物であり、該混合物のアミン価が100~225であることを特徴とする請求項11又は12に記載の難燃性接着剤組成物。
- 請求項1~10の何れかに記載の積層フィルムを配した電子機器。
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US12/997,467 US20110177330A1 (en) | 2008-06-11 | 2009-06-08 | Flame-retardant adhesive composition and laminated film |
EP09762249A EP2292713A4 (en) | 2008-06-11 | 2009-06-08 | FLAMMABLE ADHESIVE AND FILM LAMINATE |
CN2009801219066A CN102057012A (zh) | 2008-06-11 | 2009-06-08 | 阻燃性粘接剂组合物及叠层膜 |
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JP2015054935A (ja) * | 2013-09-12 | 2015-03-23 | ソマール株式会社 | 接着剤組成物及び接着シート |
JP2015063646A (ja) * | 2013-09-26 | 2015-04-09 | Dic株式会社 | 難燃性マスターバッチ、難燃性樹脂組成物およびその製造方法 |
CN103540243A (zh) * | 2013-10-16 | 2014-01-29 | 苏州瑞邦塑胶有限公司 | 一种纳米阻燃涂料 |
CN103540257A (zh) * | 2013-10-16 | 2014-01-29 | 苏州瑞邦塑胶有限公司 | 一种聚氨酯阻燃纳米涂料 |
KR20160118277A (ko) * | 2014-01-31 | 2016-10-11 | 소마아루 가부시끼가이샤 | 접착 시트 |
WO2015115570A1 (ja) * | 2014-01-31 | 2015-08-06 | ソマール株式会社 | 接着シート |
JPWO2015115570A1 (ja) * | 2014-01-31 | 2017-03-23 | ソマール株式会社 | 接着シート |
US10113087B2 (en) | 2014-01-31 | 2018-10-30 | Somar Corporation | Adhesive sheet |
KR102254818B1 (ko) | 2014-01-31 | 2021-05-21 | 소마아루 가부시끼가이샤 | 접착 시트 |
JP2016084470A (ja) * | 2014-10-23 | 2016-05-19 | ソマール株式会社 | 接着シート |
JP2019214729A (ja) * | 2014-10-23 | 2019-12-19 | ソマール株式会社 | 接着シート |
JP2018193420A (ja) * | 2017-05-12 | 2018-12-06 | リンテック株式会社 | 粘着樹脂組成物 |
JP2021532233A (ja) * | 2018-07-24 | 2021-11-25 | ヘンケル・アクチェンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト・アウフ・アクチェンHenkel AG & Co. KGaA | 難燃性接着剤組成物 |
JP7295939B2 (ja) | 2018-07-24 | 2023-06-21 | ヘンケル・アクチェンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト・アウフ・アクチェン | 難燃性接着剤組成物 |
WO2021206041A1 (ja) * | 2020-04-06 | 2021-10-14 | パナソニックIpマネジメント株式会社 | 樹脂組成物、樹脂フィルム材、プリント配線板及びプリント配線板の製造方法 |
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JPWO2009150818A1 (ja) | 2011-11-10 |
CN102057012A (zh) | 2011-05-11 |
EP2292713A4 (en) | 2012-08-08 |
TW201004804A (en) | 2010-02-01 |
US20110177330A1 (en) | 2011-07-21 |
EP2292713A1 (en) | 2011-03-09 |
KR20110018938A (ko) | 2011-02-24 |
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