TWI238842B - Damping resin composition - Google Patents

Abstract

The present invention provides a damping resin composition having both excellent damping properties and rigidity, and further to provide a molded product of the composition. This damping resin composition comprises (A) a liquid crystal polymer and (B) a thermoplastic resin, and satisfies the relation between a loss factor eta at 1,000 Hz frequency and a flexural modulus E represented by the formula (I): etaxE (GPa) >= 0.07 (GPa).

Description

Case No. 91105141_year month__ V. Description of the invention (1) [Field of the invention] A formed body using the vibration-damping resin composition of the present invention has both good vibration-damping properties and rigidity. [Background of the Invention] Synthetic resins are widely used in the molding materials of various electrical and electronic products. However, depending on the purpose of use, sometimes it is required to have vibration reduction (attenuating the vibration when it is applied to the molded body) Nature) and rigidity (the nature of an object that resists load deformation by bending elasticity, etc.). Although soft materials have good vibration damping properties, they have poor rigidity and rigid materials have opposite properties. Therefore, it is virtually impossible to obtain high-level vibration damping properties and the opposite properties of rigidity by using synthetic resin alone. The traditional method is to use a damping material with a laminated structure such as metal and resin. However, the manufacturing steps of such a laminated vibration-damping material are complicated because they must be laminated, and because they contain metal, they have a problem of weight increase. Therefore, it is required to have high-level vibration damping and rigidity without metal. Of synthetic resin.

T23884S 9mMzn

V. Description of the invention (2) Although it is developed for laser printers, facsimile devices, photocopiers, display devices, and scanning optical devices combined with liquid crystal products (Japan, Kaiping 5 3 4 1 2 1 9 Japanese Patent Application Laid-Open No. 9 _ 丨 3 3 8 8 6 Japanese Patent Application No. 1I requires high-vibration damping and rigidity for the resin material used in the optical box used in the aforementioned device. [Objective of the Invention and Overview] The achievement of 3: if is to solve the problem of providing high-level vibration damping and rigid fat composition%, and using the aforementioned resin composition to produce a molded body and a molded optical device. The object τ @ ΐ t ϋ The secondary purpose is to provide (A) liquid crystal polymer and (B plastic resin, frequency j OOn H, β) heat.

Under turbulent foot, f 々 々, τ, 0 0 Η Cognitive loss coefficient 77 and flexural modulus P

A vibration-damping resin composition that satisfies the relationship shown in the following formula (1). Feng E l x E (GPa) = ° · 07 (GPa) ⑴ The loss coefficient 77 is supported by the central curvature elasticity n E (GPa) according to the second; two = law material The other-purpose of the present invention is to measure two. A molded body and a molded body for an optical device. The above-mentioned vibration-damping resin composition body = f invention provides-a kind of vibration-damping resin composition composed of a point along the body, that is, provided with the optical axis, the composition of the composition test requirements of the following () and /, 5 ′, the vibration-absorbing body with the inner axis deviating. (A) and / or (b) Shaping optical device molding The maximum distance d of the optical axis vibration is 2 mm or less. Optical axis of the body after annealing in peach and i hours㈣m2mm

Page 6 1238842 Case No. 91105141_ Year, Month, and Day Five. Description of the invention (3) [Simplified description of drawing number] 10 Optical table 12 Mirror holder 14 First reflector 16 Speech test box 18 Second reflector 20 Motor 22 Half mirror 24 He-Ne laser vibrator 26 Screen [Details] The (A) liquid crystal polymer used in the present invention is aromatic-aliphatic polyester, fully aromatic polyester, aromatic polyimide, Polyimide ester and the like are selected among compounds having an anisotropic molten state. Aromatic-aliphatic polyesters include copolymers of polyethylene terephthalate and benzene (methane) acid. Completely aromatic polyesters include copolymers of P-Hydroxybenzoic Acid and 6-hydroxy-2-naphthalene (m) acid, and copolymers of p-Hydroxybenzoic Acid, terephthalic acid, and 6-hydroxy-2-naphthyl Wait. Polyazomethylene (Polyazomethylene) has Poly (cyano-2-methyl-1,4-phenylene nitroethy riden) and so on. Polyimide esters include copolymers of 2,6-naphthalenedicarboxylic acid, terephthalic acid, and 4 (4-hydroxyphthalimidine tetraimine) phenol, and biphenol and 4-(4- Copolymers of hydroxyphthalic acid, terbium imine, benzene (methane) acid, etc.

Page 7 No. 91105141_year month__ V. Description of the invention (4) To determine whether these copolymers are liquid crystal polymers, the optical anisotropy is confirmed in the molten state of the liquid crystal polymer. For example, a test piece adjusted to a thickness of 1 m or less is placed on a heating stage of a deflection microscope, and heating is performed at a temperature increase rate of 2 ° C / min in a nitrogen atmosphere. In this state, the polarizing mirror of the deflection microscope is perpendicular, and it is easy to observe and confirm at a magnification of 40 times and 100 times. With this method, the temperature at which these copolymerizations are transformed into a liquid crystal phase can also be measured at the same time. This transition temperature can also be measured by differential scanning calorimetry (DSC).

The thermoplastic resin of the component (B) used in the present invention is selected from polycarbonate resins, polystyrene resins, polyolefin resins, polyamide resins, and biphenyl sulfide resins. 1 or more. The component (B) is preferably a combination of a polycarbonate resin alone, or a polycarbonate resin and a polystyrene resin, especially ABS resin or ASA; The polycarbonate resin can be obtained by reacting a divalent phenol and a carbonate precursor by a known solution method or melt method.

Divalent phenols range from 2, 2-bis (4-hydroxyphenyl) propane (bisphenol A), bis (4-hydroxyphenyl) methane, 1,2-bis (4-hydroxyphenyl) ethane, 2, 2-bis (4-hydroxy-3,5-dimethylphenol) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenol) propane, 2, 2-bis (4-hydroxy- One or more of 3-methylphenol) propane, bis (4- ^ phenylphenyl) sulfide, bis (4-hydroxyphenyl) code, etc.

. Among them, a bis (4-hydroxyphenyl) alkane system is preferred, and a bisphenol A 0 carbonate precursor system is preferred from a diallyl carbonate such as a diphenyl carbonate, a dimethyl carbonate, and a diphenyl carbonate. Dialkyl carbonates such as ethyl carbonate, phosgene

Page 8 T72RR4? Case No. 91105141 Λ_Ά said Amendment 5. The carbonyl halides such as the description of the invention (5), di ha 1 of or mate of divalent phenol, etc., more than one of which is selected from haloformate. Although the number-average molecular weight of the polycarbonate resin is not particularly limited, it is preferably within a range of about 17000 to 3200 in order to provide a molded body composed of a composition with mechanical strength necessary for practical use. Polystyrene resins are polymers of styrene and styrene derivatives such as alpha-substituted and nuclear-substituted styrene. In addition, these substances are mainly single-molecule objects, and also include these substances and ethylene compounds such as butyronitrile, acrylic acid, methyl acrylic acid, and / or conjugated diene such as butadiene and isocene diene. Copolymers of single molecular objects of compounds are included. For example, polystyrene, impact-resistant polystyrene (ΗIPS) resin, acrylonitrile-butadiene-styrene copolymer (AS), acrylonitrile-styrene-ethyl acetate compatibility, polystyrene copolymerization of ethylene Monomers and compounds of essential components of a colloidal polymer obtained by polymerizing an ethylene-based copolymer unsaturated compound are necessary complexes, an ethylene copolymer (ABS) resin, acrylonitrile-styrene resin, and styrene-butane Ethylene copolymers (SBS resin olefin-acrylate copolymers (ASAA resin), etc. In addition, in order to improve the olefinic resins with polyamide resins, they may also contain carboxyl-containing unsaturated compound-based copolymers. Saturated compound copolymers, in the presence of colloidal polymers, and other monomolecular copolymers containing carboxyl and, if necessary, copolymerizable. The specific components are shown below. 1) The carboxyl unsaturated compound is copolymerized. Next, the graft polymerization is made by using aromatic vinyl polymer as the necessary body, or by polymerizing aromatic vinyl and single molecules containing carboxyl unsaturated components.

1238842 ^^ 9iL〇5i4i_ ± _n __ ^ # j £ _ V. Description of the invention (6) 2) In the presence of a colloidal polymer, 'copolymerized by a single molecule containing aromatic ethylene and a carboxyl-containing unsaturated compound as essential components Graft copolymers, 3) Monomer copolymer mixtures of unreinforced rubber-reinforced polystyrene resins containing carboxy unsaturated compounds, monosaturates containing unsaturated compounds, and aromatic ethylene as essential components, • 4) a mixture of copolymers containing 1), 2), a carboxyl-containing unsaturated compound, and aromatic ethylene as essential components, 5) aforesaid 1), 2), 3), 4), and aromatic ethylene A mixture of copolymers of the necessary ingredients. In the foregoing 1) to 5), the 'aromatic ethylene' is preferably styrene, and the monomolecular body copolymerized with the aromatic ethylene is preferably butadiene. The carboxyl group-containing unsaturated compound in the polystyrene resin is preferably a weight percentage of 0.1 to 8 and more preferably 0 to 2 to 7 weight percentage. Polyolefin resins, such as polymers with monomolecular components based on monoolefins having 2 to 8 carbon atoms, are made from low density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, and ethylene. -One or more of propylene random copolymer, ethylene-propylene block copolymer, polymethylpentene, and polybutene-1 are selected. Among them, polypropylene is most preferred. Polyamine resins are polyamine resins and their copolymers composed of di (membered) amines and dicarboxylic acids. Specifically, such as nylon 66 and polydecanehexamethylene diamine (but only 6 · 10) 、 polyhexraethylene dodecanam i do (and Shilun 6.12), poly dodecame thy 1 ene dodecanam i do (and talent 1 2 1 2), * * (Nylon Mx D 6), * * (resistant to 4 6) and its mixtures and co-

Page 10 1238842 Case No. 91105141_year month—day_i ±± _ 5. Description of the invention (7) ^ Polymer; nylon 6/6 6, 6 T 6 Nylon 6 6 / 6 T (6T · polyhexamethylene terephta 1 amid), 6 I with a content of 50 mol% or less, 66/61 (61:? 〇1 丫 116 乂 & 11161: 11716116 isophthalamid), nylon 6T / 6I / 66. Copolymers of Nylon 6T / 6I / 610, etc .; polyhexamethylene terephtalamid (Nylon 6T), polyhexamethylene isophthalamid (and Zilun 61), poly (2-methyl * cyclopentadiene) terephtalamid (Nylon M5T), polymer (2-fluorenylcyclopentane) Copolymers of isophthalamid (Cailon M5I), nylon 6T / 6I, 6T / M5T, etc. Other copolymerized nylons such as amorufasnylon are also possible, while amorufasnylon is terephthalic acid And polycondensates of trimethl hexamethy 1 ene diamine. In addition, ring-opening polymers of cyclic lactam, polycondensates of amino acids, and copolymers composed of these components, such as nylon 6, poly-ω-undecanamid (nylon 11), poly- ω —dodecanamid (resistance theory 1 2) copolymer of urethane aliphatic polyamine resin and its copolymer, and polyamidoamine composed of di (membered) amine and dicarboxylic acid, specifically nylon 6T / 6, Nylon 6T / 1, Nylon 6T / 12, Nylon 6T / 6I / 12, Nylon 6T / 6I / 6 10/12, etc. and their mixtures. The structure of the biphenyl sulfide resin is a repeating unit represented by the formula below 70 mol%, which is essentially a linear structure. It can also be used in combination with other polymers at a ratio of 30 mol% or less. Polymerization is also possible.

The content of (A) component and (B) component in the composition, the (A) component should be 5 to 50 weight percent, 7 to 4 5 weight percent is better, 10 to 40 weight

Case number 91105141_ 年月 日 __ V. Explanation of the invention (8) | The percentage is the best, and the (B) component should be 9 5 ~ 50 0 weight percent, 9 3 ~ 5 5 weight percent is better, 90 ~ 60 The weight percentage is the best. The composition of the present invention is a blendable (C) inorganic filler. The main purpose of this (C) component is to improve the rigidity. Generally speaking, it cannot increase the loss coefficient by 7 ?. However, in (X E) shown in the formula (I), the bending elastic modulus is increased by blending the (C) component, thereby improving the vibration damping performance. ^ (C) The components are fibers, flakes, plates, whiskers, granules, hollow beads, etc., and are generally used as the shape of the thermoplastic resin reinforcement material. The filler material is inorganic [glass, carbon, silicon-containing Compounds (silicon carbide, etc.), metals or metal salts (for example, oxidized oxide, shed acid, osmium, titanium, copper, potassium titanate, zinc carbonate, etc.), etc., and organic matter [polyamide fiber, etc.]. In order to improve the adhesiveness of the resin and the filler, the surface of the filler may be treated with a silane-based, epoxy-based, propylene-based, or titanate-based coupling agent, as long as the purpose of the invention is not impaired. The content of the component (C) in the composition is 100 weight based on the total of the components (A) and (B), and the content should be 1 to 1 2 0, if it can be 5 to 1 0 0 The weight is better, and the weight from 10 to 80 is the best. A flame retardant may be added to the composition of the present invention. The formed body of an optical device usually requires flame resistance, and a flame retardant can be added to form a composition having both vibration damping and flame resistance. As the flame retardant, hydrated metal flame retardants such as aluminum hydroxide and magnesium hydroxide, bromine flame retardants, chlorine flame retardants, thallium flame retardants, and inorganic flame retardants such as antimony trioxide can be used. Among them, It is best to use a flame retardant.

1238842 Case No. 91105141 Five. Description of the invention (9) The actinide flame retardant is not particularly limited to compounds that must contain a europium atom, and may be red osmium, organic osmium compounds, such as osmates, phosphonic acids, and the like Derivatives (containing salts), phosphinic acid and its derivatives (containing salts), phosphine, phosphine oxide, bi phosphine, scale salts, ^ sphasen, phosphaf enantren derivatives, inorganic scale salts and the like. The content of the (D) component in the composition is 100% by weight with respect to the total of the (A) & (B) components, and the amount should be 〇. 丨 ~ 50, and a weight of -40 is better. 5 A weight of ~ 30 is best. In the composition of the present invention, it is also possible to add anti-oxidants for heat, light, and oxygen stabilizers (phenol-based compounds, fluorene-based compounds, etc.); benzodiazole-based compounds, dibenzone-based compounds, and water. Salicylic acid phenyl compound # UV absorber 'hi nder ed am i ne stabilizers, heat stabilizers such as tin compounds, epoxy compounds, etc.), plasticizers, sliding modifiers such as polydimethylsiloxane , Lubricants, release agents, antistatic agents, colorants, etc. The composition of the present invention has a loss coefficient 77 and a bending elasticity E at a frequency of 1 000 !! 2 obtained by a specific measurement method, and satisfies the relationship of the following formula (I). η X E (GPa) ^ 〇.07 (GPa) (1) In the present invention, the value represented by the formula (I) should be 1.085 (GPa) or more, and preferably 0 · 10 (Gpa) or more. The respective ranges of the loss coefficient 7 of the present invention and the bending elasticity E can be adjusted according to the required vibration damping and rigidity to meet the relationship of formula (I) according to the application. For example, particularly high rigidity is required without vibration damping

Page 13 T9 No. 42 Case No. 91105141 _ year month day __ V. Description of the invention (10) When the application is too demanding, it can increase the bending elasticity E and reduce the loss within the range satisfying the relationship of the formula (I) Coefficient 7? Conversely, if a particularly high vibration damping property is required without rigidity, the loss coefficient 77 can be increased and the bending elasticity E can be reduced within the range satisfying the relationship of formula (I). The molded body can also be formed by the conventional resin molding method using the aforementioned vibration-damping resin assembly and product. The method of forming the formed body for a scanning optical device is not particularly limited, but the shape of the formed body is different. Generally, an injection molding method and an injection compression molding method are used. Because the formed body of the present invention has good vibration damping properties, it is most suitable for a combination of a scanning optical device in a laser printer, a facsimile device, a photocopier, a display device, a camera, and a video camera, and is particularly suitable for a scanning optical device. Optical box outside the unit. In addition, when used in a molded body for a scanning optical device such as an optical box, a vibration damping test using optical axis vibration or measuring optical axis deviation is performed so that it satisfies One or both parties. (a) The maximum distance d of the optical axis vibration is 2 mm or less, preferably 1.8 mm or less. (b) The optical axis deviation dl of the shaped body after annealing at 80 ° C for 1 hour is 2 mm or less, preferably 1.8 mm or less. With this method, because one or both of (a) and (b) are satisfied, for example, when used in an optical box such as a laser printer or facsimile, the printing deviation will be less, and a sharp image can be obtained. Therefore, it is most suitable for high-resolution optical devices.

Page 14 1238842 Case No. 91105141_ Year Month Day Amendment_ Five. Description of the invention (π) Details and measurement methods of each component used in the examples. As shown below. 1. Use component (A) component LCP: liquid crystal polymerization (Product name VECTRA A 9 50: POLY PLASTIC Co., Ltd.) • (B) Ingredients ^ PC: Polycarbonate ABS: ABS Resin (C) Ingredients Glass Fibers · Product Name ECS-03T-129, Nihon Denki Talc manufactured by Glass Co., Ltd .: trade name MICRO WHITE 5 0 0 0 S, Lin Huacheng Chemical Co., Ltd. (D) component flame retardants ·· Trade name FP 50 0, Asahi Denka Kogyo Co., Ltd. 2 · Measurement method (1) Loss coefficient 77 The test device (conceptual diagram) shown in Fig. 1 was used, and a specific constant vibration method (JISG 0 6 2) supported by the center was used to perform the measurement in the following manner. First, injection molding of the resin composition of the examples and comparative examples was performed under the same conditions to obtain a flat test body. Next, in the central part of one side of the test body, fix the mounting screws with the instant adhesive. Thereafter, this test body was placed on the impedance head (imp d a n c h e a d) ′ and fixed to the impedance head with the aforementioned mounting screws, and then mounted on the vibration machine.

Case No. 1238842 91105M1__ 年月 月 __ V. Description of the invention (12) Secondly, ‘swing vibration is performed using a vibrating machine, and the transfer function (vibration degree / vibration force) is measured using the output of the impedance head. First, apply 3116 port 111: 〇3 丨 116 wave below 101 ^ 2 for about 30 seconds, grasp the approximate natural vibration number, and then use the Fourier resolver boom analysis function to The sine wave was scanned around the natural vibration number, and the transfer function was measured. The transfer function measured in this way is processed by a computer using the half-value amplitude method (refer to Figure 2) to calculate the loss coefficient 77 from the following formula: β = (f 2-f D / f 〇. Dimensions vary between 1000 ~ 2000mm in length, 10 ~ 20mm in width, and 2 ~ 5mm in thickness. Using the above measurement method, find the loss coefficients of 50 Hz and 1 1 0 ± 50 Hz for goo soil. The average value of the number of vibrations is taken as a loss coefficient of 1000 Hz. (2) The flexural modulus E (GPa) is measured in accordance with I SO 1 78. (3) (3-1) Vibration damping test (optical axis) (Measurement of vibration) Using the measuring device in Figures 3 and 4, the vibration damping test was performed in the following way. Figure 3 is a plan view of the device and Figure 4 is a front view of the device. The measurement device shown in Fig. 4 will be described. A mirror holder 12 is provided on one end of the optical table 10 with a tripod, and the first reflecting mirror 14 is fixed to the inner inclined surface. The test box 16 is placed in the optical Stage 1 〇 and mirror holder 1 2 phases

Page 16 1238842 Cable No. 91105141 _ Year and Month Five. Description of the Invention (13) A box of 72mm, 124mm in width, 50mm in height, and thickness is placed on the optical table 10 with the opening facing down and fixed by resin. State of contact. This test box 16 is formed by injection molding using the compositions of the examples and comparative examples, and has a vertical length of 6 mm without a cover. The second reflecting mirror 18 is fixed on the outer side of the epoxy test box 16 She will be thundered by touching the inside and side of the part. λ a t ^ 8-blade electric motor 20 is placed inside the test box 16. The motor 20 is fixed on the optical table 20. 2 2 is a half mirror, 24 is a He-Ne laser vibrator, 26 is a screen, and the second half of the screen is the second half of the test. The second mirror is shot on the screen. , And before. At this time, the maximum distance is measured. For the description of using the measuring equipment shown in Figure 3 and Figure 4, A He-Ne laser vibrator radiates light (the optical axis is indicated by a thick solid line in the figure), and changes its direction at 2 2. De Jun, will use a younger mirror 14th, 8th, and 1st mirror 1 4 In order to reflect, the final irradiation point at this time is the origin. As shown, the distance between the mirror 14 and the second reflector 18 is 70 mm, and the distance between the mirror 14 and the curtain 26 is 30 mm. 'At 23 ° C, & 乂, start the electric operation in the test box 16 at 1000 rpm ^ ㈣ rpm for 15 minutes. The same is described. According to the private, laser light is diffracted and mapped. In the labor curtain 26 plus-矣 *, the irradiation point (vibration point) and the original point of the girl ’s car μ vibration (d in the third figure), enter the maximum distance d. If the smaller, the smaller the optical axis deviation ,in

No. 91105141_ 年月 日 __ V. Description of the invention (14) The vibration state still has good optical axis stability. (3-2) Vibration damping test (measurement of optical axis deviation after annealing treatment) Set up a test box in the same way as the above (3-1) optical axis deviation measurement method, and confirm the origin of the laser light irradiation point. Then, a movable thermostatic bath was installed, and the test box and the first reflecting mirror were simultaneously placed in the thermostatic bath. The test box was annealed at 80 ° C for 1 hour, and then the thermostatic bath was removed and left at room temperature for 30 minutes. Measure the irradiation point of the laser light, and define the distance d 1 from the origin measured before annealing as the deviation of the optical axis after annealing. The smaller the deviation of the optical axis, the better the optical axis stability of thermal hysteresis. (4) Flame retardancy Evaluation is performed using a test piece with a thickness of 1/8 inch according to the UL94 test method. Examples 1 to 8 and Comparative Examples 1 to 4 Table 1 shows the blending ratio [(A), (B). The components are weight percentages. The others are represented by a weight ratio of (A) and (B) of 100 in total], using a tumbler, mixing other than glass fiber, and then melting and stirring with a biaxial extruder to form small balls shape. The cylinder temperature was brought to 250 ° C, and glass fibers were mixed in from the side feed port in the middle part of the extruder to obtain a spherical vibration-damping resin composition. Using the obtained sphere, injection molding was performed at a cylinder temperature of 25 (TC, mold temperature of 60 ° C), and the above-mentioned measurements (1) to (4) were performed on the molded product.

Page 18 T73RR4? Case No. 91105141_ Year Month Day _ V. Description of the invention (15) _ Table 1 Example Bi Shi J 1 2 3 4 S 6 7 8 1 2 3 4 (A) LCP 30 50 30 30 50 30 30 30 (B) PC 70 50 55 70 50 70 50 70 100 100 70 70 ABS 15 20 30 30 (C) Glass fiber 66 100 66 80 66 66 66 66 66 Talc 10 20 (D) Flame resistance 25 25 Loss coefficient ( ;) 0.036 0.043 0.030 0.016 0.018 0.013 0.010 0.014 0.007 0.004 0.008 0.008 Flexural modulus (E) 4.20 5.20 3.60 11.10 13.40 12.20 13.20 11.90 2.20 9.70 8.10 8.00 ηχ Ε 0.15 0.22 0.11 0.18 0.24 0.16 0.13 0.17 0.02 0.04 0.06 0.06 Optical axis vibration (Caffe) 1.4 1.0 1.6 1.2 0.7 1.4 1.5 1.3 3.5 3.2 2.8 2.7 Deviation of the optical axis of the flame (m) 1.3 1.4 1.8 1.4 0.7 1.3 1.7 1.8 4.1 4.3 4.2 6.2 Μ (UL94) HB HB HB HB HB HB HB V- 0 HB HB HB V-0

IIB11I Page 19 I238842tsfc 91105141_year month day__ 5. Description of the invention (16) The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The equal changes and modifications of the shape, structure, features, and spirit described in the scope of the patent application for invention shall all be included in the scope of patent application for this invention.

Page 20 T73RR4? Case No. 91105141 _ year month day __ Brief description of the drawing _ Figure 1 is a conceptual diagram of a measuring device for the loss coefficient β. Fig. 2 is an explanatory diagram of a method for measuring the loss coefficient π. Fig. 3 is a plan view of a measuring device used for vibration damping test measurement. Fig. 4 is a front view of a measuring device used for vibration damping test measurement.

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Claims (1)

No. 1238842 Case No. 91105141 Amendment 6. Scope of patent application 5 • For the vibration-damping resin composition of item 4 of the patent application scope, in which (D) the flame retardant is a rhenium-based flame retardant. 6 · A shaped body, which is composed of a vibration-damping resin composition according to any one of the scope of claims 1 to 5 of the patent application. 7-A molded body for a scanning optical device, characterized in that it comprises a vibration-damping resin composition according to any one of claims 1 to 5 of the patent application range. 8 · A molded body for a scanning optical device, which is composed of a vibration-damping resin composition according to any one of claims 1 to 5, and is characterized in that the optical axis vibrates or measures the deviation of the optical axis Vibration damping test to meet the requirements of (a) and / or (b) below: (a) The maximum distance d of the optical axis vibration is 2mm or less; (b) The shaped body is annealed at 80 ° C for 1 hour The optical axis deviation dl is 2 mm or less. Lu Page 23