JP2001335700A - Impact resistance improver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impact resistance improver capable of imparting both impact resistance and flame-retardancy to a resin by adding a small amount of it without affecting the balance of physical properties of the resin, and to provide an impact resistant resin containing the improver. SOLUTION: This impact resistance improver comprises a polymer having Si-O bond and B-O bond. This impact resistant resin composition contains 0.1 to 50 pts.wt. of the impact resistance improver to 100 pts.wt. of the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact modifier for imparting impact resistance to a resin, and to an impact resin composition containing the impact modifier.

[0002]

2. Description of the Related Art In general, resins used in electronic, electric and OA equipment are required to be inexpensive and have physical properties such as rigidity, impact resistance, heat resistance, moldability and flame retardancy. Polycarbonate resins have well-balanced physical properties and are used for various products, but have a problem that they have high melt viscosity and are inferior in molding processability or inferior in chemical resistance. In order to solve this problem, alloying with a polyester resin such as polyethylene terephthalate or polybutylene terephthalate, or a polystyrene resin such as an acrylonitrile-butadiene-styrene copolymer resin or a rubber-modified polystyrene resin has been performed.

However, when a crystalline polyester resin is alloyed with a polycarbonate resin, which is a non-crystalline resin, a problem arises in that impact resistance is reduced due to compatibility of the resin. Further, when the polystyrene resin is alloyed, the impact resistance of simple polystyrene is reduced, and even if the impact properties are improved by a rubber-modified polystyrene resin, the flame retardancy is significantly impaired. .

[0004] Silicone compounds are known as additives for imparting both impact resistance and flame retardancy to resins. For example, Japanese Patent Application Laid-Open No. 8-113712 discloses that a substance comprising a polydimethylsiloxane gum having a functional group such as a hydroxyl group or a vinyl group and a silica filler have both effects, but the impact resistance is improved. However, the effect is low in flame retardancy, and the resin itself, such as polyphenylene ether, has high flame retardancy.
It was not versatile so as to conform to L-94 V-0 (US Underwriters Laboratory Standard).

[0005]

DISCLOSURE OF THE INVENTION In view of the above situation, the present invention provides an impact-resistant resin which imparts both impact resistance and flame retardancy to a resin by adding a substantially small amount without impairing the balance of physical properties of the resin. An object of the present invention is to provide an improver and an impact-resistant resin composition containing the same.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies for the purpose of maintaining the impact resistance specific to silicone compounds and improving the flame retardancy to practical performance.
The present inventors have found that a specific compound comprising a siloxane unit and a boric acid unit remarkably improves the impact resistance of the resin and expresses a high degree of flame retardancy, and completed the present invention.

That is, the present invention provides an impact modifier comprising a polymer having a Si—O bond and a BO bond, and the impact modifier is added to 100 parts by weight of a resin. It is intended to provide an impact-resistant resin composition containing 0.1 to 50 parts by weight.

Hereinafter, the present invention will be described in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The impact modifier of the present invention comprises silicon, boron and oxygen and has a skeleton substantially formed from Si—O bonds and BO bonds.
It is a polymer having a skeleton in which a silicon atom or a boron atom is bonded to another silicon atom or a boron atom via an oxygen atom. In this case, the skeleton of the polymer may include not only the Si—O—B bond but also a Si—O—Si bond or a B—O—B bond, but the polymer has a Si—O skeleton in the molecule. This makes it possible to maintain the impact resistance specific to the silicone compound and further improve the flame retardancy by having a BO skeleton, and therefore, it is preferable that the silicone compound contains a Si-OB bond.

Such a polymer can be produced by a known method. For example, JP-A-53-50299, JP-A-54-83100, JP-A-57-23629 and JP-A-5-23629.
It can be produced by the method described in 8-201821 or the like.

It is important that the impact modifier of the present invention has an organic group in the molecule in order to improve the compatibility and dispersibility with the resin, and the organic group has 1 to 20 carbon atoms. The group is not particularly limited as long as it is selected from the group consisting of an alkyl group, an alkoxy group, an acyloxy group, and an aromatic group having 6 to 20 carbon atoms. In order to express impact resistance and flame retardancy in a well-balanced manner, it is preferable that at least one aromatic ring is present in the molecule, and the aromatic ring in the molecule is one or both of a silicon atom and a boron atom. Is more preferable in order to improve the flame retardancy. The method for introducing an aromatic ring into a molecule is not particularly limited.

Here, the aromatic ring is a general term for rings belonging to aromatic groups, and is not particularly limited. Various substituents may be attached on the aromatic ring. Preferred aromatic rings include a phenyl group, a cresyl group, a xylenyl group, a naphthyl group, and an anthracenyl group. Further, it may be an aromatic ring substituted with a halogen atom.

The silicon atom in the skeleton of the flame retardant polymer is S
iO _4/2 unit, SiRO _3/2 unit, SiR ₂ O _2/2 unit or SiR ₃ O _1/2 unit (wherein R represents a substituent capable of bonding to Si, and a plurality of Rs may be the same. Or at least one of a plurality of R's is a hydrocarbon having an aromatic ring.)

[0014] Although there is no particular limitation on the proportions of these units, preferably of silicon atoms total number, SiRO _3/2 units 10 mol% or more, more preferably a SiRO _3/2 units 30 mol% or more, further Preferably, it contains at least 50 mol% of SiRO _3/2 units. If the SiRO _3/2 unit is less than 10 mol%, the resulting resin composition may not have sufficient flame retardancy. Further, preferably out of silicon atoms total number, SiO _4/2 units is less than 50 mol%, more preferably less than SiO _4/2 units 30 mole%, more preferably SiO _4/2 units is less than 10 mol% . SiO
_{If the 4/2} unit exceeds 50 mol%, the resulting resin composition tends to have reduced impact resistance and reduced flame retardancy. Preferably, among all the silicon atoms, Si
R ₂ O _2/2 units are less than 80 mol%, more preferably Si
R ₂ O _2/2 units are less than 50 mol%, more preferably Si
R ₂ O _2/2 units are less than 20 mol%. SiR ₂ O
_{When the 2/2} unit exceeds 80 mol%, the flame retardancy of the obtained resin composition tends to decrease.

The impact modifier of the present invention contains Si in the skeleton.
RO _3/2 unit (wherein R represents a substituent capable of bonding to Si, a plurality of Rs may be the same or different, and at least one of the Rs has an aromatic ring It is preferable to use a three-dimensionally crosslinked polymer containing a hydrocarbon and a BO _3/2 unit, since more excellent impact resistance and flame retardancy can be obtained. In this case, SiRO
_It may contain silicon-containing units other than _3/2 units,
_It may contain boron-containing units other than _3/2 units.

Such a polymer may be, for example, one or more boron compounds selected from boric acid, boron oxide, metal borate salts, boron halides, borate esters, and the like;
iRX ₃ (wherein, R represents a monovalent hydrocarbon group. X is at least one member selected from halogen, a hydroxyl group, and a dehydration condensate of a hydroxyl group. May be synthesized by mixing with at least one silicon compound represented by the formula (1) in the presence or absence of a solvent while heating as necessary. At this time, among the compounds represented by SiRX ₃ , R
By using part of a compound having an aromatic ring, SiRO _3/2 units in the backbone (wherein R represents a bondable substituents with Si, be different even a plurality of R each identical Good, and at least one of a plurality of Rs is a hydrocarbon having an aromatic ring.) And a three-dimensional crosslinked polymer containing BO _3/2 units.

Further, SiRX ₃ (wherein R is a monovalent hydrocarbon group, X is at least one selected from halogen, hydroxyl group and dehydration condensate of hydroxyl group, and a plurality of Xs are different even if they are the same. Other than the compound represented by the formula: SiX ₄ , SiR ₂ X ₂ , SiR ₃ X (wherein R is 1
The divalent hydrocarbon group and X are one or more selected from halogen, a hydroxyl group, and a dehydration condensate of a hydroxyl group, and a plurality of Xs may be the same or different from each other. ), BRX ₃ (wherein R is a monovalent hydrocarbon group, X is a halogen, a hydroxyl group and a hydroxyl group), in addition to the boron compound. One or more selected from dehydration condensates, and a plurality of Xs may be the same or different from each other.) It is possible to synthesize improvers. In particular, a polymer having a desired molecular weight can be synthesized by using an appropriate amount of a compound represented by SiR ₃ X as a terminator for the synthesis reaction.

The silicon atom: boron atom ratio contained in the impact modifier of the present invention is not particularly limited, but the silicon atom: boron atom ratio is preferably from 100: 1 to 1: 4, and more preferably from 70: 1 to 1: 1. 1: 3 is more preferred, and 50: 1.
１ ： 1: 2 is most preferred. If the silicon atom: boron atom ratio is higher than 100: 1, the resulting impact resistance and flame retardancy may not be sufficient. When the silicon atom: boron atom ratio is higher than 1: 4, the resulting polymer tends to be unstable, such as being easily hydrolyzed.

The type of the group other than the oxygen atom directly bonded to one or both of the silicon atom and the boron atom contained in the impact modifier of the present invention is not particularly limited. Is preferably a hydrocarbon group containing an aromatic ring. Among them, a hydrocarbon group in which an aromatic ring is directly bonded to a silicon atom is preferable. Further, a hydrocarbon group containing no aromatic ring may be bonded to one or both of a silicon atom and a boron atom. Examples of the hydrocarbon group containing no aromatic ring include a monovalent linear or cyclic alkyl group, and those having a small number of carbon atoms in the alkyl group are preferable for obtaining better flame retardancy. A particularly preferred alkyl group is a methyl group. The ratio of the hydrocarbon group directly bonded to one or both of the silicon atom and the boron atom is not particularly limited, but in order to obtain better impact resistance and flame retardancy, at least 10 mol% of the hydrocarbon group is aromatic. It is preferably a hydrocarbon group having a ring.
More preferably, 1% or more is a hydrocarbon group having an aromatic ring, and most preferably, 50% or more of the hydrocarbon group is a hydrocarbon group having an aromatic ring.

The impact modifier of the present invention can be used to enhance the affinity with a resin or to impart various properties, by copolymerizing various compounds within the range not impairing the purpose of the present invention, or by adding various functional groups. Can be metamorphosed. The method for copolymerizing various compounds is not particularly limited, and examples thereof include a graft copolymer, a block copolymer, a random copolymer, and a copolymer having only a terminal substituted. The method of modification with various functional groups is also not particularly limited, and examples thereof include a method of copolymerizing a functional group-containing compound and a method of modifying by a chemical reaction. The compound to be copolymerized is not particularly limited as long as the purpose of the present invention is not impaired. Examples of the compound to be copolymerized, an epoxy group-containing compound, a vinyl group-containing compound, a hydroxyl group-containing compound, a carbonyl group-containing compound, a carboxyl group-containing compound, an alkoxyl group-containing compound,
Phenyl group-containing compound, amino group-containing compound, amide group-containing compound, imide group-containing compound, mercapto group-containing compound, nitrile group-containing compound, ether group-containing compound,
Examples include an ester group-containing compound, various polymer compounds, and the like. In particular, by copolymerizing a compound or a polymer having a substituent having a high affinity with the resin to be added, it is possible to maintain various properties of the obtained resin composition.

The weight average molecular weight of the impact modifier of the present invention is not particularly limited, but is preferably 800 to 10,000,000, more preferably 1200 to 1,000,000,
Most preferably, it is 2000 or more and 200,000 or less. When the weight average molecular weight is less than 800, the flame retardancy may not be sufficient, and when the weight average molecular weight exceeds 10,000,000, the obtained impact resistance and flame retardancy tend to decrease.

The shape of the impact resistance improver of the present invention is not particularly limited, and may be any shape such as oil, gum, varnish, powder, and pellet. When using the impact modifier of the present invention, only one type may be used alone, or two or more types may be used in combination. The combination of two or more types is not particularly limited, and those having different polymerization components and molar ratios, those having different molecular weights, and the like can be used in any combination. Further, it is not excluded that the impact resistance improver of the present invention contains other additives within a range not to impair the purpose of the present invention.

The desired object can be achieved by adding 0.1 to 50 parts by weight of the impact modifier of the present invention to 100 parts by weight of the resin. If the amount is less than 0.1 parts by weight, the effect of improving impact resistance and flame retardancy may not be obtained,
If it exceeds 50 parts by weight, the surface properties, moldability and the like tend to deteriorate. Preferably 0.3 to 30 parts by weight,
More preferably, it is 0.5 to 20 parts by weight. Incidentally, by using the impact modifier of the present invention in combination with other known various impact modifiers or various flame retardants, it is possible to obtain even higher flame retardancy. The impact resistance and flame retardancy can be obtained even with a small addition amount without being limited to the above-mentioned usage amount.

When the impact modifier of the present invention has another additive component, the amount of the polymer may be adjusted to fall within the above range.

The resin used in the impact-resistant resin composition of the present invention is not particularly limited, and various polymer compounds to which a flame retardant can be mixed can be used. The resin may be a thermoplastic resin or a thermosetting resin,
The resin may be a synthetic resin or a resin existing in nature. Examples of such synthetic resins include polyvinyl chloride resin, polymethyl methacrylate resin, acrylonitrile-styrene copolymer resin, methyl methacrylate-styrene copolymer resin, polystyrene resin, polypropylene resin, polyethylene resin, cyclic olefin copolymer resin, and polycarbonate. Resin, polyester resin, polyamide resin, polyphenylene ether resin, polyacetal resin, polysulfone resin, polyphenylene sulfide resin, polyimide resin, polyamideimide resin, polyetherimide resin, polyetheretherketone resin or polyarylate resin, and at least one of these And at least one selected from the group consisting of two types of polymer alloys. When it is difficult to obtain sufficient impact resistance improving property and flame retardancy by using the impact modifier of the present invention alone, other known various impact modifiers or various flame retardants are combined. Thereby, high impact resistance improvement and flame retardancy can be exhibited.

Among resins, it is easy to improve the impact resistance and to make it flame-retardant by using the present invention.
It is preferable to use an aromatic resin as the resin. The aromatic resin indicates a resin having at least one aromatic ring in a molecule.

Among the aromatic resins, aromatic polycarbonate resins, aromatic polyester resins, polyphenylene ether resins, aromatic vinyl resins, polyphenylene sulfide resins, N-aromatic substituted maleimide resins, and polyimide resins It is preferable to use at least one selected from the group consisting of These resins may be used alone or as an alloy with other various resins.

The resin composition of the present invention may further comprise a polymer other than the polymer of the present invention within a range not impairing the properties of the present invention, in order to further enhance the molding fluidity and to improve the impact resistance and flame retardancy. Silicone or the like can be added.

The silicone other than the polymer of the present invention means a polyorganosiloxane in a broad sense excluding the flame retardant polymer of the present invention, and specifically, (poly) siloxane such as dimethylsiloxane and phenylmethylsiloxane. Diorganosiloxane compounds; (poly) organosilsesquioxane compounds such as methylsilsesquioxane and phenylsilsesquioxane; (poly) triorganosylhemiokis such as trimethylsilhemioxane and triphenylsilhemioxane Sun compounds; copolymers obtained by polymerizing these; polydimethylsiloxane, polyphenylmethylsiloxane and the like. In the case of polyorganosiloxane, the molecular terminals are epoxy groups, hydroxyl groups, carboxyl groups,
Modified silicones substituted with a mercapto group, amino group, ether group, etc. are also useful. The shape of the silicone is not particularly limited, and any shape such as an oil, a gum, a varnish, a powder, and a pellet can be used.

Further, the flame-retardant resin composition of the present invention is used for further improving molding fluidity and improving low-temperature impact resistance.
Rubber components other than the polymer of the present invention can be added as long as the properties of the present invention are not impaired.

As the rubber component other than the polymer of the present invention,
Ethylene-vinyl acetate copolymer, methyl methacrylate-butadiene-styrene copolymer (MBS resin), acrylonitrile-butadiene-styrene copolymer (ABS
Resin), butyl acrylate-methyl methacrylate copolymer, butyl acrylate-styrene-methyl methacrylate copolymer, butyl acrylate-methyl methacrylate copolymer, epoxy-modified ethylene-propylene copolymer, styrene-butadiene copolymer Styrene-isoprene copolymer, styrene-ethylene-butylene copolymer, styrene-ethylene-propylene copolymer and the like.

In order to improve the performance of the resin composition of the present invention, antioxidants such as phenolic antioxidants and thioether antioxidants; heat stabilizers such as phosphorus stabilizers; It is preferable to use only one type or two or more types together. Further, if necessary, usually well-known,
Lubricants, release agents, plasticizers, flame retardants such as phosphorus compounds, flame retardant aids, anti-dripping agents, ultraviolet absorbers, light stabilizers, pigments, dyes, antistatic agents, conductivity-imparting agents, dispersants, Additives such as compatibilizers and antibacterial agents can be used alone or in combination of two or more.

The method for producing the impact-resistant resin composition of the present invention is not particularly limited. For example, it can be produced by a method in which the above-mentioned components are dried as necessary, and then melt-kneaded by a melt-kneading machine such as a single-screw or twin-screw extruder. When the compounding agent is a liquid, it can be manufactured by adding the compounding agent to a twin screw extruder in the middle using a liquid supply pump or the like.

The method of molding the impact-resistant resin composition of the present invention is not particularly limited, and molding methods generally used, for example, injection molding, blow molding, extrusion molding, vacuum molding, press molding, calender molding , Foam molding and the like can be used. The impact-resistant resin composition of the present invention can be suitably used for various applications. Preferred applications include injection molded products such as home appliances, OA equipment components, and automobile components, blow molded products, extruded molded products, and foam molded products.

[0035]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the following, unless otherwise specified, "parts"
Means parts by weight, and "%" means% by weight. Production Example 1 Production of Impact Modifier (S-1) for Resin Addition In a pyridine solution (1 L) containing boric acid (100 g, 1.62 mol), phenyltrichlorosilane (3
42.7 g, 1.62 mol) was added dropwise.
The mixture was heated for a period of time to perform a reflux reaction. Thereafter, trimethylchlorosilane (176 g, 1.62 mol) was added, and the mixture was refluxed for another 3 hours to complete the reaction. The reaction mixture is 2N
-Neutralized with hydrochloric acid and extracted with diethyl ether (500 mL). The resulting solution is dried over anhydrous sodium sulfate,
The target compound was obtained by distilling off the solvent under vacuum.
As a result of GPC analysis, the molecular weight was Mw = 2733 (polystyrene conversion, UV detector). The resulting compound is
As a result of IR analysis, a peak derived from a BO bond was shown around 1360 cm ^-1 , and a peak derived from a Si-Ph bond was shown around 1430 cm ^-1 . As a result of the analysis by NMR, Me ₃ —Si—O _1/2 bond was 13 mol% in the total number of silicon atoms,
The content of Ph-Si-O3 _{/ 2} bonds was 87 mol%. Production Example 2 Production of Impact Modifier (S-2) for Adding Resin To a pyridine solution (1 L) containing boric acid (100 g, 1.62 mol) was added phenyltrichlorosilane (1) under ice-cooling.
62.4 g (0.81 mol) of diphenyldichlorosilane (205.1 g, 0.81 mol) was added dropwise, and a reflux reaction was performed for 5 hours. Thereafter, trimethylchlorosilane (176 g, 1.62 mol) was added, and the mixture was refluxed for another 3 hours to complete the reaction. The reaction mixture was neutralized with 2N-hydrochloric acid and extracted with diethyl ether (500 mL).
The obtained solution was dried over anhydrous sodium sulfate, and the solvent was distilled off under vacuum to obtain the target compound. As a result of GPC analysis, the molecular weight was Mw = 8925 (polystyrene conversion, UV detector). As a result of the analysis by NMR,
14 mol% of Me ₃ —Si—O _1/2 bonds, 51 mol% of Ph—Si—O _3/2 bonds, Ph ₂ −
The amount of Si—O _2/2 bonds was 35 mol%. The raw materials used in Examples and Comparative Examples are summarized below. -PC: bisphenol A type polycarbonate having a viscosity average molecular weight of 22000-PET: polyethylene terephthalate resin having a logarithmic viscosity of 0.70-PBT: polybutylene terephthalate resin having a logarithmic viscosity of 1.20-PS: polystyrene resin (Nippon Steel Chemical Co., Ltd.) ABS: acrylonitrile-butadiene-styrene copolymer resin (trade name, manufactured by Kaneka Chemical Co., Ltd.) Kaneka MUH E-1300 Silicone 1: modified silicone (Shin-Etsu Chemical Co., Ltd.) )
Silicone 2: Silicone rubber (Toray Dow Corning Silicone Co., Ltd. Trefil E-500) Silicone 3: Silicone resin (XR39-B1676 manufactured by Toshiba Silicone Co., Ltd.) Silicone 4: Silicone resin (DC4-7051 manufactured by Toray Dow Corning Silicone Co., Ltd.) Example 1 Preparation of resin composition 100 parts by weight of polycarbonate resin (PC), Production Example 1
3 parts by weight of the impact modifier (S-1) for addition of the resin prepared in the above, and ADK STAB HP-10 and AO-60 (both trade names, manufactured by Asahi Denka) as phosphorus-based and phenol-based stabilizers, respectively. After dry blending 0.1 parts by weight and 0.2 parts by weight of polyflon FA-500 (trade name of Daikin Industries, Ltd.) as tetrafluoroethylene in advance, a vented twin-screw extruder [TEX44] with a cylinder temperature set to 270 ° C (Trade name): manufactured by Nippon Steel Works Co., Ltd.] and melt-extruded to obtain a resin composition. After creating the resulting pellets of the test piece was dried for 5 hours at 120 ° C.,
Using a 35t injection molding machine, a bar having a thickness of 1.6 mm and 3.2 mm (width 12 mm, length 127 mm) was prepared at a cylinder temperature of 270 ° C. and a mold temperature of 50 ° C., and the following evaluation was performed. Table 1 shows the results. Evaluation method Impact resistance: Evaluated by an Izod impact test with a notch of 23 ° C. and a 3.2 mm bar according to ASTM D-256. -Flame retardancy: 0.9 mm thick according to UL-94 standard
The flame retardancy of 1.6 mm bars was evaluated in the V test. Examples 2 to 7 and Comparative Examples 1 to 9 Resin compositions were obtained in the same manner as in Example 1 except that the types of the resin and the impact modifier were changed to the number shown in Table 1. From the pellets thus obtained, each test piece was prepared in the same manner as above. The above evaluation method was performed on these test pieces. Table 1 shows the evaluation results.

[0036]

[Table 1] As shown in Table 1, in the examples, the addition of the impact resistance improver of the present invention shows good impact resistance and shows ductile fracture in both cases of alloying with polycarbonate alone or other resins. Was. Further, even though the test piece had a small thickness, it exhibited very good flame retardancy, whereas Comparative Example 1 was inferior in flame retardancy because no flame retardant was used. In Comparative Examples 2 to 4, impact resistance was reduced and flame retardancy was inferior because a resin having low compatibility with polycarbonate was alloyed. In Comparative Example 5, since the rubber-modified styrene resin was alloyed,
The impact resistance was improved, but the flame retardancy was poor. Example 8 and Comparative Examples 6 to 9 were carried out using a polycarbonate resin / polyethylene terephthalate resin (90/10 weight ratio) alloy as the resin and the impact resistance improver of the present invention and a silicone resin modifier other than the present invention. A resin composition was obtained and evaluated in the same manner as in Example 1. Table 2 shows the evaluation results.

[0037]

[Table 2] When the impact resistance improver of the present invention was used, both the impact resistance and the flame retardancy were good. On the other hand, when the silicone compound other than the present invention was similarly added, the silicone 1 of Comparative Example 6 Improves flame retardancy, but poor impact resistance,
Conversely, the silicone compounds of Comparative Examples 7 to 9 have improved impact resistance but are inferior in flame retardancy.

[0038]

EFFECTS OF THE INVENTION The impact modifier of the present invention imparts both excellent impact resistance and flame retardancy by adding a substantially small amount without impairing the physical property balance of the resin, and is inexpensive. It can be relatively easily synthesized using various raw materials.
Such resin additives are very useful industrially.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J002 BB031 BB121 BC031 BC071 BD041 BG061 BG101 BK001 CB001 CF001 CF161 CG001 CH091 CL001 CM041 CN031 CP192 CQ022 FD202 GQ00 4J035 BA01 HA04 LA01 LB20

Claims (5)

[Claims] 1. An impact modifier comprising a polymer having a Si—O bond and a BO bond. 2. An organic group selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an alkoxy group, an acyloxy group, and an aromatic group having 6 to 20 carbon atoms on one or both of silicon and boron atoms. The impact modifier according to claim 1, which has the above. 3. The method according to claim 1, wherein the Si—O—B bond is substantially
A three-dimensional crosslinked structure consisting of RO _3/2 units (wherein R represents an organic group capable of bonding to Si and a plurality of Rs may be the same or different) and BO _3/2 units The impact modifier according to claim 1 or 2, wherein the polymer is a polymer having one or more aromatic rings in the molecule. 4. The impact modifier according to claim 1, which is present in an amount of 0.5 to 5 based on 100 parts by weight of the resin.
An impact-resistant resin composition containing 0 parts by weight. 5. The resin is a polyvinyl chloride resin, a polymethyl methacrylate resin, an acrylonitrile-styrene copolymer resin, a methyl methacrylate-styrene copolymer resin, a polystyrene resin, a polypropylene resin, a polyethylene resin, a cyclic olefin copolymer resin, polycarbonate. Resin, polyester resin, polyamide resin, polyphenylene ether resin, polyacetal resin, polysulfone resin, polyphenylene sulfide resin, polyimide resin, polyamideimide resin, polyetherimide resin,
The impact-resistant resin composition according to claim 4, wherein the impact-resistant resin composition is at least one selected from the group consisting of a polyetheretherketone resin, a polyarylate resin, and a polymer alloy composed of at least two of them.