WO2019124223A1 - 架橋成形体およびその製造方法 - Google Patents
架橋成形体およびその製造方法 Download PDFInfo
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- WO2019124223A1 WO2019124223A1 PCT/JP2018/045938 JP2018045938W WO2019124223A1 WO 2019124223 A1 WO2019124223 A1 WO 2019124223A1 JP 2018045938 W JP2018045938 W JP 2018045938W WO 2019124223 A1 WO2019124223 A1 WO 2019124223A1
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- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/04—Monomers containing three or four carbon atoms
- C08F210/08—Butenes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0222—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould the curing continuing after removal from the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/20—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds unconjugated
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- C08J3/00—Processes of treating or compounding macromolecular substances
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- C08J3/243—Two or more independent types of crosslinking for one or more polymers
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- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
- C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
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- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29K2019/00—Use of rubber not provided for in a single one of main groups B29K2007/00 - B29K2011/00, as moulding material
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
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- B29K2105/0014—Catalysts
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
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- B29K2105/0041—Anti-odorant agents, e.g. active carbon
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
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- B29K2105/243—Partially cured
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- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
- C08F210/18—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers with non-conjugated dienes, e.g. EPT rubbers
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08J2323/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
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- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
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- C08K2003/265—Calcium, strontium or barium carbonate
Definitions
- the present invention relates to a method of producing a crosslinked molded article comprising a composition containing a polymer having a terminal double bond, preferably a composition containing an ethylene / ⁇ -olefin / nonconjugated polyene copolymer, by two-step crosslinking.
- a copolymer composition obtained by hydrosilyl crosslinking ethylene / ⁇ -olefin / nonconjugated polyene random copolymer (hereinafter sometimes abbreviated as EPDM) is sulfur vulcanized or peroxide crosslinked It is superior in mechanical strength, heat aging resistance, compression set, bloom property, and capable of continuous crosslinking as compared with the above, and is expected to be applied to sealing parts such as packings and gaskets.
- injection molding machine injection molding machine
- injection molding machine injection molding machine
- the molding time is extremely long as compared to the time for obtaining a molding such as polyethylene or polypropylene which is easily cooled and solidified in the molding die.
- the rubber composition described in Patent Document 1 has a short scorch time and a slow crosslinking rate, so even if it is intended to obtain a crosslinked molded article using an injection molding machine, injection molding In-machine cross-linking starts, which reduces the processability of extrusion-injection molding, and in order to cross-link, it is necessary to hold the molding in a mold for a relatively long time, in any case There were problems in obtaining a crosslinked molded product by injection molding.
- the present invention is capable of shortening one cycle in injection molding when injection molding to obtain a crosslinked molded product, and a method of producing a crosslinked molded product having less compression set and a crosslinked molded product having less compression set. It is to provide.
- the present invention is a polymer having a terminal double bond which is excellent in curing characteristics when crosslinking is performed, preferably the ethylene / ⁇ -olefin / nonconjugated polyene copolymer described in the present invention, and excellent in control of the crosslinking behavior. It has been found that it is possible to solve the above-mentioned problems by combining the cross-linking agent of and the cross-linking method in two stages.
- the present invention relates to the following items [1] to [6].
- [1] Polymer having terminal double bond, hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups in one molecule, platinum-based catalyst (Z) for hydrosilicon crosslinking, and reaction inhibitor (D)
- the melt-kneaded polymer composition is melt-kneaded, injection-molded into a mold, primary crosslinking is carried out in the mold, and the primary-crosslinked molded article is removed from the mold and A method for producing a crosslinked molded article, characterized in that the following crosslinking is carried out.
- the polymer having a terminal double bond is selected from the group consisting of ethylene (A), an ⁇ -olefin having 3 to 20 carbon atoms (B), and the following general formulas (I) and (II) Have a structural unit derived from a nonconjugated polyene (C) containing two or more partial structures in total in the molecule,
- the molar ratio of ethylene / ⁇ -olefin is 40/60 to 99.9 / 0.1.
- the weight fraction of the structural unit derived from the nonconjugated polyene (C) is 0.07% to 10% by weight in 100% by weight of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is there.
- the polymer composition comprises 0.1 to 100 parts by mass of the hydrosilyl group-containing compound (Y) and 100 parts by mass of the polymer having the terminal double bond, and the platinum-based catalyst (Z)
- the temperature during melt-kneading is in the range of 50 to 130 ° C.
- the temperature of the injection mold is in the range of 90 to 220 ° C.
- the temperature of the heat medium is in the range of 90 to 220 ° C.
- [5] The process for producing a crosslinked molded article according to any one of the above [1] to [4], wherein the primary crosslinking time is in the range of 0.5 to 60 seconds.
- the present invention it is possible to shorten the molding time (one cycle) of injection molding of a crosslinked molded article, and to provide a crosslinked molded article with less compression set.
- the method for producing a crosslinked molded article of the present invention comprises a polymer having a terminal double bond, preferably an ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S), and at least two hydrosilyl groups in one molecule.
- a polymer composition containing a hydrosilyl group-containing compound (Y), a platinum catalyst (Z) for hydrosilicon crosslinking, and a reaction inhibitor (D) is melt-kneaded and injection molded into a mold. It is characterized in that it is briefly crosslinked in the mold and then further crosslinked in a heat medium.
- any polymer having a terminal double bond can be used without any limitation, but in particular, ethylene, ⁇ -olefin, non-conjugated as described below Polyene copolymer (S) is preferred.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) used in the method for producing the molded article of the present invention comprises ethylene (A), an ⁇ -olefin having 3 to 20 carbon atoms (B), It has a constituent unit derived from a nonconjugated polyene (C) including two or more partial structures selected from the group consisting of general formulas (I) and (II) in total in the molecule.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is further added to the structural units derived from (A), (B) and (C) above, and It may have a constituent unit derived from a non-conjugated polyene (D) containing only one partial structure selected from the group consisting of I) and (II) in the molecule.
- Examples of the ⁇ -olefin (B) having 3 to 20 carbon atoms include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1- Examples thereof include decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-eicosene and the like.
- ⁇ -olefins of 3 to 8 carbon atoms such as propylene, 1-butene, 1-hexene and 1-octene are preferable, and propylene is particularly preferable.
- Such ⁇ -olefins are relatively inexpensive in raw material cost, and the resulting ethylene / ⁇ -olefin / nonconjugated polyene copolymer exhibits excellent mechanical properties and further provides a molded article having rubber elasticity. It is preferable because it can be These ⁇ -olefins may be used alone or in combination of two or more.
- the ethylene / ⁇ -olefin / non-conjugated polyene copolymer (S) contains a structural unit derived from at least one ⁇ -olefin having 3 to 20 carbon atoms (B), It may contain a constitutional unit derived from two or more kinds of ⁇ -olefins of 3 to 20 carbon atoms (B).
- nonconjugated polyene (C) containing two or more partial structures totally selected from the group consisting of the above general formulas (I) and (II) in the molecule. 1,4-hexadiene, dicyclopentadiene and the like.
- the nonconjugated polyene (C) contains VNB because the availability is high, the hydrosilyl crosslinking is good, and the heat resistance of the polymer composition is easily improved, and the nonconjugated polyene (C) Is more preferably VNB.
- the nonconjugated polyene (C) may be used alone or in combination of two or more.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is derived from ethylene (A), an ⁇ -olefin having 3 to 20 carbon atoms (B) and the nonconjugated polyene (C) In addition to the constituent units, it may further contain a constituent unit derived from a nonconjugated polyene (D) containing only one partial structure selected from the group consisting of the general formulas (I) and (II) in the molecule. Good.
- ENB is preferable because it is easily available, it is easy to control the crosslinking rate at the time of hydrosilyl crosslinking, and easy to obtain good mechanical properties.
- the nonconjugated polyene (D) may be used alone or in combination of two or more.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer of the present invention comprises a nonconjugated polyene (D) containing only one partial structure selected from the group consisting of the general formulas (I) and (II) in the molecule.
- the ratio is not particularly limited as long as the object of the present invention is not impaired, but usually 0 to 20% by weight, preferably 0 to 8% by weight, more preferably 0. It is contained in a weight fraction of about 01 to 8% by weight (provided that the total of the weight fractions of (A), (B), (C) and (D) is 100% by weight).
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is, as described above, ethylene (A), ⁇ -olefin having 3 to 20 carbon atoms (B), and the above nonconjugated polyene A copolymer having a structural unit derived from (C) and, if necessary, the above non-conjugated polyene (D), which satisfies the following requirements (i) to (v).
- the molar ratio of ethylene / ⁇ -olefin is 40/60 to 99.9 / 0.1.
- the weight fraction of the structural unit derived from the non-conjugated polyene (C) is 0.07% by weight to 10% by weight.
- Weight average molecular weight (Mw) of ethylene / ⁇ -olefin / nonconjugated polyene copolymer and weight fraction of (C) weight fraction of constituent unit derived from nonconjugated polyene (C) (% by weight
- the molecular weight of the nonconjugated polyene (C) (molecular weight of (C)) satisfy the following formula (1).
- the requirement (i) is that the ethylene / ⁇ -olefin molar ratio in the ethylene / ⁇ -olefin / non-conjugated polyene copolymer (S) according to the present invention satisfies 40/60 to 99.9 / 0.1.
- the molar ratio is preferably 50/50 to 90/10, more preferably 55/45 to 85/15, and still more preferably 55/45 to 78/22.
- Such ethylene / ⁇ -olefin / nonconjugated polyene copolymer of the present invention is preferable because molded articles obtained by hydrosilyl crosslinking show excellent rubber elasticity and excellent mechanical strength and flexibility. .
- composition derived from the amount of ethylene (the content of the structural unit derived from ethylene (A)) and the amount of ⁇ -olefin ( ⁇ -olefin (B) in the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S)
- the content of units can be determined by 13 C-NMR.
- Requirement (ii) is that in the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention, the weight fraction of the structural unit derived from the nonconjugated polyene (C) is ethylene / ⁇ -olefin ⁇ Specified in the range of 0.07% by weight to 10% by weight in 100% by weight of the nonconjugated polyene copolymer (S) (that is, in 100% by weight of the total of the weight fractions of all constituent units) is there.
- the weight fraction of the structural unit derived from this non-conjugated polyene (C) is preferably 0.1% by weight to 8.0% by weight, more preferably 0.5% by weight to 5.0% by weight desirable.
- the crosslinked molded article according to the present invention has sufficient hardness and is excellent in mechanical properties In the case of hydrosilyl crosslinking, a rapid crosslinking rate is exhibited, and the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention is suitable for the production of a crosslinked molded article. It is preferable because
- the amount of nonconjugated polyene (C) (content of constituent units derived from nonconjugated polyene (C)) in ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is determined by 13 C-NMR. Can.
- the requirement (iii) is that in the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention, the weight average molecular weight (Mw) of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer and the copolymer weight
- Mw weight average molecular weight
- Mw molecular weight of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer
- the weight fraction of the constituent unit derived from the nonconjugated polyene (C) (the weight fraction of (C): weight%) and the molecular weight of the nonconjugated polyene (C) (molecular weight of (C)) It is specified that the following relational expression (1) is satisfied.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention satisfy the following relational expression (1 ′).
- the weight average molecular weight (Mw) of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) can be determined as a polystyrene-converted numerical value measured by gel permeation chromatography (GPC).
- weight fraction of Mw ⁇ (C) / 100 / (C) molecular weight is the above formula (1) or (1 ′)
- the degree of crosslinking becomes appropriate, and by using this, it is possible to produce a molded article excellent in mechanical properties and heat aging resistance in a well-balanced manner.
- the weight fraction of Mw ⁇ (C) / 100 / (C) is too small, the crosslinkability may be insufficient upon hydrosilylation crosslinking, which may result in a slow crosslinking rate.
- it is too large crosslinking may occur excessively to deteriorate mechanical properties.
- intrinsic viscosity [ ⁇ ]
- weight fraction of constituent units derived from the nonconjugated polyene (C) weight fraction of (C): weight%
- C weight fraction of (C): weight%
- ethylene / ⁇ -olefin / nonconjugated polyene copolymers tend to contain more long chain branches as the content of constituent units derived from nonconjugated polyene increases, but ethylene / ⁇ -olefins according to the present invention It is considered that the non-conjugated polyene copolymer (S) can satisfy the above formula (2) by having less long chain branching than conventionally known ethylene / ⁇ -olefin / non-conjugated polyene copolymer.
- the P value is a complex viscosity at 0.1 rad / s, which is obtained by measurement using a viscoelasticity measuring apparatus Ares (manufactured by Rheometric Scientific) under conditions of 190 ° C., strain 1.0% and frequency change.
- the ratio ( ⁇ * ratio) is obtained from the complex viscosity at 100 rad / s and the complex viscosity at 100 rad / s.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention preferably satisfies the following formula (2 ′).
- the intrinsic viscosity [ ⁇ ] means a value measured in decalin at 135 ° C.
- ⁇ Requirement (v)> is the number of long chain branches per 1000 carbon atoms (LCB 1000 C ) obtained by using 3D-GPC of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention It is specified that the natural logarithm [Ln (Mw)] of the weight average molecular weight (Mw) satisfies the following formula (3).
- Such ethylene / ⁇ -olefin / non-conjugated polyene copolymer (S) has a small proportion of long chain branching contained and is excellent in the curing characteristics when hydrosilyl crosslinking is carried out, and a molded product obtained using this Is preferable because it is excellent in heat aging resistance.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention preferably satisfies the following formula (3 ′).
- LCB 1000 C ⁇ 1 ⁇ 0.071 ⁇ L n (Mw) .. Formula (3 ′)
- Mw and the number of long chain branches per 1000 carbon atoms can be determined by structural analysis using 3D-GPC. In the present specification, specifically, it was determined as follows.
- the absolute molecular weight distribution was determined using a 3D-high temperature GPC apparatus PL-GPC 220 (manufactured by Polymer Laboratories), and at the same time, the limiting viscosity was determined with a viscometer.
- the main measurement conditions are as follows.
- each average value was calculated from the following formulas (v-2), (v-3) and (v-4) as g ′.
- Trendline assumed to have only short chain branching was determined for each sample.
- the branch number BrNo per molecular chain, the number of long-chain branches LCB 1000C per 1000 carbons, and the degree of branch ⁇ per unit molecular weight were calculated.
- the BrNo calculation uses the Zimm-Stockmayer equation (v-5), and the LCB 1000C and ⁇ use the equations (v-6) and (v-7).
- g is a long chain branching parameter determined from the radius of inertia Rg, and the following simple correlation is made with g 'determined from the limiting viscosity.
- various values have been proposed according to the form of the molecule.
- ⁇ Br No / M (V-6)
- LCB 1000 C ⁇ ⁇ 14000 (V-7)
- 14000 represents a molecular weight equivalent to 1000 units of methylene (CH 2 ).
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention preferably has an intrinsic viscosity [ ⁇ ] of 0.1 to 5 dL / g, more preferably 0.5 to 5.0 dL / g, More preferably, it is 0.9 to 4.0 dL / g.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) preferably has a weight average molecular weight (Mw) of 10,000 to 600,000, more preferably 30,000 to 500,000, More preferably, it is 50,000 to 400,000.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention satisfy both the above-mentioned intrinsic viscosity [ ⁇ ] and the weight average molecular weight (Mw).
- the nonconjugated polyene (C) preferably contains VNB, more preferably VNB. That is, in the formula (1), the formula (2), the formula (4) described later, etc., it is preferable that "weight fraction of (C)" is "weight fraction of VNB” (% by weight).
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention is, as described above, in addition to the structural units derived from the above (A), (B) and (C), A weight fraction of 0 to 20% by weight of a structural unit derived from a nonconjugated polyene (D) containing only one partial structure selected from the group consisting of general formulas (I) and (II) in the molecule
- the total of the weight fractions of (A), (B), (C) and (D) be 100% by weight). In this case, it is preferable to satisfy the following requirement (vi).
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) containing the structural unit derived from the above (D) satisfies the formula (4)
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) The hydroxy crosslinked molded product obtained from the composition of (1) is preferable because it exhibits excellent mechanical properties and heat aging resistance.
- the apparent iodine value derived from the nonconjugated polyene (C) can be determined by the following equation.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) preferably contains a sufficient amount of constituent units derived from the nonconjugated polyene (C), and
- the weight fraction of the constituent unit derived from the conjugated polyene (C) (the weight fraction of (C) (% by weight)) and the weight average molecular weight (Mw) of the copolymer satisfy the following formula (6) Is preferred.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) has the number (n C ) of structural units derived from the nonconjugated polyene (C) per weight average molecular weight (Mw). Preferably, it is 6 or more, more preferably 6 or more and 40 or less, further preferably 7 or more and 39 or less, and further preferably 10 or more and 38 or less.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention contains a sufficient amount of structural units derived from nonconjugated polyene (C) such as VNB, and contains long chain branching.
- C nonconjugated polyene
- the amount is small, the curing characteristics in the case of crosslinking using a peroxide are excellent, the moldability is good, the balance of physical properties such as mechanical characteristics is excellent, and in particular, the heat aging resistance is excellent.
- the number (n D ) of structural units derived from the nonconjugated polyene (D) per weight average molecular weight (Mw) is Preferably, the number is 29 or less, more preferably 10 or less, and even more preferably less than 1.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention is in such a range that the content of the constituent unit derived from the nonconjugated polyene (D) such as ENB does not impair the object of the present invention It is preferable because it is suppressed to be difficult to cause post-crosslinking, and has sufficient heat aging resistance.
- the number (n D ) of the structural units derived from C) is the molecular weight of the nonconjugated polyene (C) or (D) and the structural unit derived from the nonconjugated polyene (C) or (D) in the copolymer From the weight fraction (weight fraction (% by weight) of (C) or (D)) and the weight average molecular weight (Mw) of the copolymer, it can be determined by the following equation.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is derived from nonconjugated polyenes (C) and (D) per weight average molecular weight (Mw)
- the ethylene / ⁇ -olefin / non-conjugated polyene copolymer (S) contains long chain branch-containing
- the composition containing a small amount of ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) is subjected to
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) comprises ethylene (A), an ⁇ -olefin having 3 to 20 carbon atoms (B), the above general formulas (I) and (C) And a partial structure selected from the group consisting of the above general formulas (I) and (II) according to need: a nonconjugated polyene (C) containing in the molecule at least two partial structures selected from the group consisting of II).
- the copolymer is obtained by copolymerizing a monomer consisting of a nonconjugated polyene (D) containing only one in the molecule in total.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention may be prepared by any preparation method as long as the above requirements (i) to (v) are satisfied. It is preferable that it is obtained by copolymerizing the monomer in the presence of and is more preferably obtained by copolymerizing the monomer in the presence of the catalyst system containing the metallocene compound.
- the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) according to the present invention is produced, for example, by employing the method described in the metallocene catalyst described in WO 2015/122495. can do.
- hydrosilyl group-containing compound (Y) reacts with a polymer having a terminal double bond such as ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) to act as a crosslinking agent.
- This hydrosilyl group-containing compound (Y) can be used in any of its structures such as resinous substances having a linear, cyclic or branched structure or a three-dimensional network structure which are conventionally produced and marketed.
- the hydrosilyl group-containing compound (Y) used in the present invention must contain at least two hydrosilyl groups in one molecule.
- Such a hydrosilyl group-containing compound (Y) generally has the following general compositional formula R 4 b H c SiO (4-bc) / 2
- the compounds represented by can be used.
- R 4 is a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, particularly 1 to 8 carbon atoms, excluding an aliphatic unsaturated bond, and such a 1
- trifluoropropyl can be exemplified.
- a methyl group, an ethyl group, a propyl group, a phenyl group and a trifluoropropyl group are preferable, and a methyl group is particularly preferable.
- b is 1 ⁇ b ⁇ 3, preferably 0.6 ⁇ b ⁇ 2.2, and particularly preferably 1.5 ⁇ b ⁇ 2
- c is 1 ⁇ c ⁇ 3 preferably Is 1 ⁇ c ⁇ 2
- b + c is 0 ⁇ b + c ⁇ 3, preferably 1.5 ⁇ b + c ⁇ 2.7.
- the hydrosilyl group-containing compound (Y) according to the present invention is preferably an organohydrogenpolysiloxane having 2 to 1000, particularly preferably 2 to 300, and most preferably 4 to 200 silicon atoms in one molecule. Specifically, 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyltetracyclosiloxane, 1,3,5,7,8-pentamethylpentacyclosiloxane, etc.
- Siloxane oligomers methyl chain polysiloxanes blocked by both terminal methylsiloxy groups, both chain terminated trimethylsiloxy groups, dimethyl siloxane / methyl hydrogen siloxane copolymers, chain chain terminated silanol groups and methyl hydrogen polysiloxanes, Molecular chain both terminal silanol-blocked dimethyl siloxane ⁇ methyl Hydrogen siloxane copolymer, Dimethylhydrogensiloxy group-capped dimethylpolysiloxane with molecular chain, Dimethylhydrogensiloxy group-capped methylhydrogenpolysiloxane with molecular chain, Dimethylhydrogensiloxy group-capped dimethylsiloxane with molecular chain Methyl hydrogen siloxane copolymer, consisting of R 2 2 (H) SiO 1/2 units and SiO 4/2 units, optionally R 2 3 SiO 1/2 units, R 2 2 SiO 2/2 units, R Mention may be made of silicone resins which may contain 2 (
- methylhydrogenpolysiloxanes blocked with a methyl chain and terminated with a molecular chain at both ends include a compound represented by the following formula, and further, some or all of the methyl groups in the following formula may be ethyl, propyl, phenyl, trifluoropropyl And the like.
- methylhydrogenpolysiloxanes blocked with dimethylhydrogensiloxy groups at both ends of the molecular chain include compounds represented by the following formula, and further, some or all of the methyl groups in the following formula may be ethyl, propyl, phenyl, trifluoro The compound etc. which were substituted by the propyl group etc. are mentioned.
- dimethylhydrogensiloxy group-capped dimethylsiloxane / methylhydrogensiloxane copolymer having both ends of molecular chain examples include a compound represented by the following formula, and further, some or all of methyl groups in the following formula may be an ethyl group, a propyl group, The compound etc. which were substituted by the phenyl group, the trifluoropropyl group, etc. are mentioned.
- E and h in the formula are each an integer of 1 or more.
- the compounds as described above can be prepared by known methods, for example, octamethylcyclotetrasiloxane and / or tetramethylcyclotetrasiloxane, and hexamethyldisiloxane or 1,3-dihydro-1 which can be an end group.
- the amount of the hydrosilyl group-containing compound (Y) according to the present invention is usually a polymer having terminal double bonds, preferably 100 parts by weight of the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S). 0.1 to 100 parts by weight, preferably 0.1 to 75 parts by weight, more preferably 0.1 to 50 parts by weight, even more preferably 0.2 to 30 parts by weight, even more preferably 0.2 to 20 parts by weight Is used in a proportion of 0.5 to 10 parts by weight, most preferably 0.5 to 5 parts by weight. It is not preferable to use the hydrosilyl group-containing compound (Y) in a proportion exceeding 100 parts by weight, because it is disadvantageous in cost.
- the platinum-based catalyst (Z) for hydrosilicone crosslinking used in the present invention is an addition reaction catalyst, and is a polymer having a terminal double bond, preferably the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) No particular limitation is imposed as long as it promotes the addition reaction (hydrosilylation reaction of an alkene) of the alkenyl group possessed by and the hydrosilyl group of the hydrosilyl group-containing compound (Y) with no particular limitation.
- the specific platinum-based catalyst may be a known one usually used for addition curing type curing, for example, a finely powdered metal platinum catalyst described in US Pat. No. 2,970,150, US Pat. And platinum-hydrocarbon complexes described in U.S. Pat. Nos. 3,159,601 and 159,662, U.S. Pat.
- platinum alone platinum black
- chloroplatinic acid platinum-olefin complex
- platinum-alcohol complex platinum-alcohol complex
- alumina silica, etc. on which platinum support is supported
- the amount of platinum-based catalyst (Z) for hydrosilicon crosslinking is usually 0.1 for a polymer having terminal double bonds, preferably relative to the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S). It is used in a proportion of up to 100 000 ppm by weight, preferably 0.1 to 10000 ppm by weight, more preferably 1 to 5000 ppm by weight, particularly preferably 5 to 1000 ppm by weight. If it is less than 0.1 ppm by weight, the crosslinking rate tends to be slow, and if it exceeds 100000 ppm by weight, it is not preferable because it is disadvantageous in cost.
- Ethylene / ⁇ -olefin / non-conjugated polyene co-weight capable of forming a crosslinked molded article having an appropriate crosslinking density and excellent in strength characteristics and elongation characteristics by using a platinum-based catalyst (C) for hydrosilicone crosslinking in the ratio within the above range A combined composition is obtained.
- the reaction inhibitor (D) used in the present invention is a polymer having a terminal double bond, preferably an alkenyl group which the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S) has, and a hydrosilyl group-containing compound ( Inhibit the crosslinking reaction of Y) with the hydrosilyl group (hydrosilylation addition reaction to alkenes).
- the suppression of the crosslinking reaction is necessary in order to stabilize the processability at the time of kneading and molding.
- the reaction inhibitor (D) used in the present invention is benzotriazole, ethynyl group-containing alcohol (eg ethynyl cyclohexanol etc.), acrylonitrile, amide compound (eg N, N-diallylacetamide, N, N-diallylbenzamide, N, N , N ', N'-tetraallyl-o-phthalic acid diamide, N, N, N', N'- tetraallyl-m-phthalic acid diamide, N, N, N ', N'- tetraallyl- p-phthalic acid diamide Etc., sulfur, phosphorus, nitrogen, amine compounds, sulfur compounds, phosphorus compounds, tin, tin compounds, organic peroxides such as tetramethyltetravinylcyclotetrasiloxane, hydroperoxide and the like.
- amide compound eg N, N-diallylacetamide, N, N-diallylbenz
- the amount of the reaction inhibitor (D) is usually 0.05 to 5 with respect to 100 parts by weight of the polymer having a terminal double bond, preferably the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S). Parts by weight, preferably 0.07 to 5 parts by weight, more preferably 0.07 to 4.5 parts by weight, still more preferably 0.1 to 4.5 parts by weight, particularly preferably 0.1 to 3.0 parts by weight It is used in parts, most particularly preferably in a proportion of 0.1 to 1.0 parts by weight. If the amount is less than 0.05 parts by weight, the crosslinking rate may be too fast, and if the reaction inhibitor (D) is used at a ratio exceeding 5 parts by weight, the effect of suppressing the reaction may be large and crosslinking may be difficult to occur.
- S ethylene / ⁇ -olefin / nonconjugated polyene copolymer
- a reinforcing agent in addition to the above-mentioned essential compounding agents, if necessary, a reinforcing agent, an inorganic filler, a softener, an antiaging agent (stabilizer), a processing aid, and a foam.
- Agents, foaming aids, plasticizers, colorants, other rubber compounding agents, rubbers, resins, etc. can be blended as other components.
- the kind and content of these compounding agents are appropriately selected depending on the application, it is particularly preferable to use a reinforcing agent, an inorganic filler, a softener and the like among them.
- examples of the resin used as needed include general-purpose resins such as polyethylene, polypropylene and polystyrene.
- general-purpose resins such as polyethylene, polypropylene and polystyrene.
- rubbers used as needed silicone rubber, ethylene-propylene random copolymer rubber (EPR), natural rubber, styrene-butadiene rubber, isoprene rubber, butadiene rubber, chloroprene rubber, etc. are blended.
- EPR ethylene-propylene random copolymer rubber
- natural rubber styrene-butadiene rubber
- isoprene rubber butadiene rubber
- chloroprene rubber etc.
- rubber (EPT) which is different from but similar to the above-mentioned copolymer (A), and furthermore, the molar ratio of ethylene / ⁇ -olefin having 3 to 20 carbon atoms even between the above-mentioned copolymers (A)
- the above-mentioned copolymers (A) having different iodine values or intrinsic viscosities [ ⁇ ⁇ ⁇ ] may be used as a mixture of two or more.
- a mixture of a low intrinsic viscosity component and a high intrinsic viscosity may be mentioned.
- the polymer composition according to the present invention is a polymer having a terminal double bond, preferably the ethylene / ⁇ -olefin / nonconjugated polyene copolymer (S), the above hydrosilyl group-containing compound (Y), and the above platinum-based It is a composition containing a catalyst (Z) and a reaction inhibitor (D).
- the preferred amount of each component contained in the polymer composition according to the present invention is as described above.
- the method for producing a crosslinked molded article according to the present invention comprises melt-kneading the polymer composition according to the present invention in a temperature range of usually 50 to 130 ° C., preferably 70 to 110 ° C., usually 90 to 220 ° C.
- the primary crosslinking time in the mold is usually 0.5 to 60 seconds, preferably 0.6 to 40 seconds, and more preferably 0.7 to 20 seconds.
- the temperature of the heat medium is usually 90 to 220 ° C., preferably 100 to 200 ° C.
- the time of secondary crosslinking (heating in the heat medium) The time) is usually about 5 to 120 minutes, preferably about 10 to 60 minutes.
- the crosslinking time in the mold can be shortened, and the injection molding cycle can be shortened to increase the manufacturing efficiency.
- the method of melt-kneading the polymer composition is a polymer having terminal double bonds in an extruder equipped with an injection molding machine, preferably the ethylene / ⁇ -olefin / non-polymer mentioned above.
- a predetermined amount of conjugated polyene copolymer (S) or the like may be measured and then melt-kneaded in the above temperature range, but a polymer having a terminal double bond separately, preferably, the ethylene / ⁇ -olefin / non-conjugated polyene
- After measuring a predetermined amount of the copolymer (S) and the like it may be melt-kneaded in advance using internal mixers such as a Banbury mixer, a kneader, and an intermix, and may be introduced into an injection molding machine.
- a method for secondary crosslinking of the molded product for example, heating such as hot air, glass bead fluidized bed, UHF (ultrahigh frequency electromagnetic wave), steam or LCM (hot molten salt tank) It can be carried out using a form of crosslinking tank. If the heating in the secondary crosslinking is performed relatively slowly using a heating medium such as heated air or heated steam in an oven etc., the crosslinking tends to proceed uniformly, and the crosslink density of the surface portion of the crosslinked molded article This is preferable because the difference with the internal crosslinking density can be controlled small.
- the step of secondary crosslinking may be batchwise or continuous.
- the crosslinked molded product when heating, radiation such as light, ⁇ -rays, or electron beams may be emitted.
- radiation such as light, ⁇ -rays, or electron beams may be emitted.
- the crosslinked molded product by performing secondary crosslinking, the crosslinked molded product can be uniformly crosslinked to the inside without being held for a long time in the mold, and the crosslink density between the central portion and the surface portion of the molded product A crosslinked molded article with a small difference can be obtained.
- the crosslinked molded article according to the present invention comprises the polymer composition described above, and preferably satisfies the following requirement (I).
- the center of the crosslinked molded article means the point most distant from the mold contact surface at the time of primary crosslinking.
- the center is in a plane bisected in the thickness direction, and the plate-shaped crosslinked molded article is trisected in the thickness direction, surface portion / internal / surface
- the crosslink density (A) of the surface part and the crosslink density (B) inside satisfy the above relational expression (7), and it is more preferable to satisfy the above relational expression (7 ′).
- Such a cross-linked molded article of the present invention has uniform cross-sectional density between the surface portion and the inner portion despite the short cross-linking time in the injection molding mold, and has homogeneous and stable mechanical properties. Especially the compression set is small.
- the crosslinked molded article of the present invention includes, for example, hoses, rubber for tires, O-rings, industrial rolls, packing (for example, capacitor packing), gaskets, vibration-proof rubber, vibration-proof material or vibration-proof material (for example, engine mount, It is suitably used for motor mounts, muffler hangers, sponges (for example, heat insulation sponges, protect sponges, fine foam sponges), color skins, paper feed rolls and the like. Among these, it is suitably used for automotive interior and exterior parts and applications requiring heat resistance, and is suitable for hoses, O-rings, packings, sponges, anti-vibration rubbers, and sponge applications.
- Weight average molecular weight (Mw), number average molecular weight (Mn), molecular weight distribution (Mw / Mn) are polystyrene equivalent values measured by gel permeation chromatography (GPC).
- the measuring device and conditions are as follows.
- the molecular weight was calculated based on a conversion method by preparing a calibration curve using commercially available monodispersed polystyrene.
- the measuring method of evaluation of the copolymer composition used by the Example and the comparative example is as follows.
- Production Example 1 The polymerization reaction of ethylene, butene and 5-vinyl-2-norbornene (VNB) was continuously performed at 95 ° C. using a 300-L volume polymerization vessel equipped with a stirring blade.
- VNB 5-vinyl-2-norbornene
- the ethylene feed amount is 4.5 kg / h
- the butene amount is 14.4 kg / h
- the VNB feed amount is 420 g / h and continuously.
- the polymerizer was continuously fed such that the hydrogen feed amount was 40.0 NL / h.
- di (p-tolyl) methylene (cyclopentadienyl) (octamethyloctahydrodibenzofluorenyl) zirconium dichloride as the main catalyst while maintaining the polymerization pressure at 1.65 MPaG and the polymerization temperature at 95 ° C. It supplied continuously to the polymerization vessel so that it might be 0.0052 mmol / h.
- an ethylene.butene.VNB copolymer (S-1) formed of ethylene, butene and VNB was obtained at a rate of 6.0 kg / h.
- ⁇ Tension test> A tensile test was conducted in accordance with JIS K 6251 at a measurement temperature of 23 ° C. and a tensile speed of 500 mm / min to measure the breaking strength (TB) [MPa] and breaking elongation (EB) [%] of the sheet. That is, a sheet-like crosslinked molded product was punched out to prepare a No. 3 dumbbell test piece described in JIS K 6251 (2001).
- a tensile test is carried out under the conditions of a measuring temperature of 25 ° C and a tensile speed of 500 mm / min according to the method defined in the same JIS K 6251, tensile stress at break (TB) and tensile elongation at break (EB) was measured.
- the crosslinking density ⁇ was calculated from the Flory-Rehner equation (a) using the following equilibrium swelling.
- V R in the formula (a) was determined by swelling / extracting a crosslinked 2 mm sheet with toluene under the condition of 37 ° C. ⁇ 72 h.
- the surface crosslink density (A) and the internal crosslink density (B) were obtained by dividing the cross-linked molded sheet prepared to a thickness of 2 mm into three into three 0.67 mm thick sheets (two outer sheets, The surface sheet crosslink density (A) was measured using the outer sheet, and the inner crosslink density (B) was measured using the inner sheet in the same manner.
- the height of the sample shall be the sum of 5 sheets measured one by one, and compressed 25% against the height of the specimen (about 10 mm) before applying the load, and the compression plate holder together with the specified temperature in the oven It set and heat-treated for the designated time. Next, the test piece was opened, allowed to cool for 30 minutes, and then the height of the test piece was measured, and the compression set (%) was calculated by the following formula.
- Compression set (%) ⁇ (t0 ⁇ t1) / (t0 ⁇ t2) ⁇ ⁇ 100 t0: height of the test piece before the test t1: height of the test piece after heat treatment and allowed to cool for 30 minutes t2: measurement of the test piece Height in a state of being attached to the mold
- [Reference Example 1] 100 parts by mass of the ethylene / butene / VNB copolymer (S-1) obtained in Production Example 1 was masticated for 1 minute using Mixtron BB-4 type mixer (manufactured by Kobe Steel, Ltd.), and then carbon was added thereto 40 parts by mass of black (Asahi # 60 G, manufactured by Asahi Carbon Co., Ltd.), 30 parts by mass of ground calcium carbonate (Whiteton SB (manufactured by Shiroishi Calcium Co., Ltd.)), Paraffinic process oil (Diana Process PW-380, 40 parts by mass of Idemitsu Kosan Co., Ltd.
- the resulting composition was press-crosslinked at 180 ° C. for 20 minutes to obtain a 150 ⁇ 150 ⁇ 2 mm flat crosslinked molded article.
- Each physical property of the obtained crosslinked molded article is shown in Table 2.
- Examples 1 to 3 As a first step, 100 parts by mass of the ethylene-butene-VNB copolymer (S-1) obtained in Production Example 1 is masticated for 1 minute using a Mixtron BB-4 mixer (manufactured by Kobe Steel) Subsequently, 40 parts by mass of carbon black (Asahi # 60 G, manufactured by Asahi Carbon Co., Ltd.), 30 parts by mass of ground calcium carbonate (Whiteton SB [Shiroishi calcium Co., Ltd.]), paraffinic process oil (Diana Process PW-380, 40 parts by mass of Idemitsu Kosan Co., Ltd., and 10 parts by mass of specially treated calcium oxide (Vesta PP (manufactured by Inoue Lime Industry Co., Ltd.)) were added and kneaded at 140 ° C. for 2 minutes. Thereafter, the ram was raised and cleaned, and kneading was further carried out for 1 minute, and the mixture was discharged at
- a 150 x 150 x 2 mm flat mold is attached to a 75 t vertical injection (VI-75 P (B)-40/60 SPR 5 (500) -P, Matsuda Seisakusho Co., Ltd.), nozzle temperature 90 ° C, mold temperature 180 C., injection speed 40 cm 3 / sec, clamping pressure 135 kgf, and curing conditions were varied (listed in the table).
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Abstract
Description
〔1〕末端二重結合を有する重合体、ヒドロシリル基を1分子中に少なくとも2個持つヒドロシリル基含有化合物(Y)、ヒドロシリコン架橋用の白金系触媒(Z)、および反応抑制剤(D)を含む重合体組成物を溶融混練して、金型内に射出成形し、当該金型内で一次架橋を行い、一次架橋を行った成形体を金型から取り出した後、熱媒体中で二次架橋を行うことを特徴とする架橋成形体の製造方法。
〔2〕前記末端二重結合を有する重合体が、エチレン(A)と、炭素原子数3~20のα-オレフィン(B)と、下記一般式(I)および(II)からなる群から選ばれる部分構造を合計で分子中に2つ以上含む非共役ポリエン(C)とに由来する構成単位を有し、
下記(i)~(v)の要件を満たすエチレン・α-オレフィン・非共役ポリエン共重合体(S)である前記〔1〕に記載の架橋成形体の製造方法。
(ii)非共役ポリエン(C)に由来する構成単位の重量分率が、エチレン・α-オレフィン・非共役ポリエン共重合体(S)100重量%中、0.07重量%~10重量%である。
(iii)エチレン・α-オレフィン・非共役ポリエン共重合体(S)の重量平均分子量(Mw)と、非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率(重量%))と、非共役ポリエン(C)の分子量((C)の分子量)とが、下記式(1)を満たす。
(iv)レオメーターを用いて線形粘弾性測定(190℃)により得られた、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)(Pa・sec)と、周波数ω=100rad/sでの複素粘度η* (ω=100)(Pa・sec)との比P(η* (ω=0.1)/η* (ω=100))と、極限粘度[η]と、前記非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率)とが、下記式(2)を満たす。
(v)3D-GPCを用いて得られた、1000炭素原子あたりの長鎖分岐数(LCB1000C)と、重量平均分子量(Mw)の自然対数[Ln(Mw)]とが下記式(3)を満たす。
〔3〕重合体組成物が、上記末端二重結合を有する重合体100質量部に対して、上記ヒドロシリル基含有化合物(Y)が0.1~100質量部、上記白金系触媒(Z)が0.1~100000重量ppm、および上記反応抑制剤(D)が0.05~5質量部の範囲にある前記〔1〕または〔2〕に記載の架橋成形体の製造法。
〔4〕溶融混練する際の温度が、50~130℃の範囲にあり、射出金型の温度が90~220℃の範囲の範囲にあり、熱媒体の温度が90~220℃の範囲にある前記〔1〕~〔3〕のいずれかに記載の架橋成形体の製造方法。
〔5〕一次架橋の時間が、0.5~60秒の範囲にある、前記〔1〕~〔4〕のいずれかに記載の架橋成形体の製造方法。
〔6〕末端二重結合を有する重合体、
ヒドロシリル基を1分子中に少なくとも2個持つヒドロシリル基含有化合物(Y)、
ヒドロシリコン架橋用の白金系触媒(Z)、および
反応抑制剤(D)
を含み、下記要件(I)を満たす架橋成形体。
要件(I):前記架橋成形体の中心となる点を(x)、(x)からの距離が最短となる架橋成形体表面上の点を(z)、(x)と(z)を結ぶ線分を2対1に内分する点を(y)としたとき、架橋成形体の(z)から(y)までの表面部架橋密度(A)と、(x)から(y)までの内部架橋密度(B)とが、次の関係式(7)を満たす。
本発明の成形体を製造する方法に用いるエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、エチレン(A)と、炭素原子数3~20のα-オレフィン(B)と、下記一般式(I)および(II)からなる群から選ばれる部分構造を合計で分子中に2つ以上含む非共役ポリエン(C)とに由来する構成単位を有する。
(i)エチレン/α-オレフィンのモル比が40/60~99.9/0.1である。
(ii)非共役ポリエン(C)に由来する構成単位の重量分率が0.07重量%~10重量%である。
(iii)エチレン・α-オレフィン・非共役ポリエン共重合体の重量平均分子量(Mw)と、非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率(重量%))と、非共役ポリエン(C)の分子量((C)の分子量)とが、下記式(1)を満たす。
(iv)レオメーターを用いて線形粘弾性測定(190℃)により得られた、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)(Pa・sec)と、周波数ω=100rad/sでの複素粘度η* (ω=100)(Pa・sec)との比P(η* (ω=0.1)/η* (ω=100))と、極限粘度[η]と、前記非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率)とが、下記式(2)を満たす。
(v)3D-GPCを用いて得られた、1000炭素原子あたりの長鎖分岐数(LCB1000C)と、重量平均分子量(Mw)の自然対数[Ln(Mw)]とが下記式(3)を満たす。
本明細書において、前記(i)~(v)をそれぞれ、要件(i)~(v)とも記す。また、本明細書において、「炭素原子数3~20のα-オレフィン」を単に「α-オレフィン」とも記す。
要件(i)は、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)中のエチレン/α-オレフィンのモル比が40/60~99.9/0.1を満たすことを特定するものであり、このモル比は好ましくは50/50~90/10、より好ましくは55/45~85/15、さらに好ましくは55/45~78/22を満たすことが望ましい。このような本発明のエチレン・α-オレフィン・非共役ポリエン共重合体は、ヒドロシリル架橋して得られる成形体が優れたゴム弾性を示し、機械的強度ならびに柔軟性に優れたものとなるため好ましい。
要件(ii)は、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)中において、非共役ポリエン(C)に由来する構成単位の重量分率が、エチレン・α-オレフィン・非共役ポリエン共重合体(S)100重量%中(すなわち全構成単位の重量分率の合計100重量%中)、0.07重量%~10重量%の範囲であることを特定するものである。この非共役ポリエン(C)に由来する構成単位の重量分率は、好ましくは0.1重量%~8.0重量%、より好ましくは0.5重量%~5.0重量%であることが望ましい。
要件(iii)は、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)において、エチレン・α-オレフィン・非共役ポリエン共重合体の重量平均分子量(Mw)と、共重合体中における非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率:重量%)と、非共役ポリエン(C)の分子量((C)の分子量)とが、次の関係式(1)を満たすことを特定するものである。
本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)が、要件(iii)を満たす場合、VNBなどの非共役ポリエン(C)に由来する構造単位の含有量が適切であって、十分なヒドロシリル架橋性能を示すとともに、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体組成物を用いて架橋成形体を製造した場合には、架橋速度に優れ、架橋後の成形体が優れた機械特性を示すものとなるため好ましい。
なお、エチレン・α-オレフィン・非共役ポリエン共重合体(S)の重量平均分子量(Mw)は、ゲルパーミエーションクロマトグラフィー(GPC)で測定されるポリスチレン換算の数値として求めることができる。
要件(iv)は、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)の、レオメーターを用いて線形粘弾性測定(190℃)により得られた、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)(Pa・sec)と、周波数ω=100rad/sでの複素粘度η* (ω=100)(Pa・sec)との比P(η* (ω=0.1)/η* (ω=100))と、極限粘度[η]と、前記非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率:重量%)とが、下記式(2)を満たすことを特定するものである。
ここで、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)と、周波数ω=100rad/sでの複素粘度η* (ω=100)との比P(η* (ω=0.1)/η* (ω=100))は、粘度の周波数依存性を表すものであって、式(2)の左辺にあたるP/([η]2.9)は、短鎖分岐や分子量などの影響はあるものの、長鎖分岐が多い場合に高い値を示す傾向がある。一般に、エチレン・α-オレフィン・非共役ポリエン共重合体では、非共役ポリエンに由来する構成単位を多く含むほど、長鎖分岐を多く含む傾向があるが、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、従来公知のエチレン・α-オレフィン・非共役ポリエン共重合体よりも長鎖分岐が少ないことにより上記式(2)を満たすことができると考えられる。本発明において、P値は、粘弾性測定装置Ares(Rheometric Scientific社製)を用い、190℃、歪み1.0%、周波数を変えた条件で測定を行って求めた、0.1rad/sでの複素粘度と、100rad/sでの複素粘度とから、比(η*比)を求めたものである。
なお、極限粘度[η]は、135℃のデカリン中で測定される値を意味する。
要件(v)は、本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)の、3D-GPCを用いて得られた1000炭素原子あたりの長鎖分岐数(LCB1000C)と、重量平均分子量(Mw)の自然対数[Ln(Mw)]とが下記式(3)を満たすことを特定するものである。
上記式(3)により、エチレン・α-オレフィン・非共役ポリエン共重合体(S)の単位炭素数当たりの長鎖分岐含量の上限値が特定される。
ここで、Mwと1000炭素原子あたりの長鎖分岐数(LCB1000C)は、3D-GPCを用いて構造解析法により求めることができる。本明細書においては、具体的には、次のようにして求めた。
2角度光散乱光度計PD2040型(Precison Detectors社製)
ブリッジ型粘度計PL-BV400型(Polymer Laboratories社製)
カラム:TSKgel GMHHR-H(S)HT×2本+TSKgel GMHHR-M(S)×1本
(いずれも1本当たり内径7.8mmφ×長さ300mm)
温度:140℃
移動相:1,2,4-トリクロロベンゼン(0.025%BHT含有)
注入量:0.5mL
試料濃度:ca 1.5mg/mL
試料濾過:孔径1.0μm焼結フィルターにて濾過
絶対分子量の決定に必要なdn/dc値は標準ポリスチレン(分子量190000)のdn/dc値0.053と単位注入質量あたりの示差屈折率計の応答強度より、試料ごとに決定した。
エチレン・α-オレフィン・非共役ポリエン共重合体(S)の重量平均分子量(Mw)と、非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率(重量%))と、共役ポリエン(D)に由来する構成単位の重量分率((D)の重量分率(重量%))と、非共役ポリエン(C)の分子量((C)の分子量)と、共役ポリエン(D)の分子量((D)の分子量)とが、下記式(4)を満たす。
式(4)では、共重合体1分子中の非共役ジエン((C)と(D)の合計)の含量を特定している。
本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、特に限定されるものではないが、レオメーターを用いて線形粘弾性測定(190℃)により得られた、周波数ω=0.01rad/sでの複素粘度η* (ω=0.01)(Pa・sec)と、周波数ω=10rad/sでの複素粘度η* (ω=10)(Pa・sec)と、非共役ポリエン(c)に由来する見かけのヨウ素価とが、下記式(5)を満たすことが好ましい。
ここで、複素粘度η* (ω=0.01)および複素粘度η* (ω=10)は、要件(vi)における複素粘度η* (ω=0.1)および複素粘度η* (ω=100)と測定周波数以外は同様にして求められる。
上記式(5)において、左辺は長鎖分岐量の指標となる剪断速度依存性を表し、右辺は重合時に長鎖分岐として消費されていない非共役ポリエン(C)の含有量の指標を表す。要件(vii)を満たし、上記式(5)を満たす場合には、長鎖分岐の程度が高すぎないため好ましい。一方上記式(5)を満たさない場合には、共重合した非共役ポリエン(C)のうち、長鎖分岐の形成に消費された割合が多いこと分かる。
また本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、重量平均分子量(Mw)あたりの、非共役ポリエン(C)に由来する構成単位の数(nC)が、好ましくは6個以上、より好ましくは6個以上40個以下、さらに好ましくは7個以上39個以下、またさらに好ましくは10個以上38個以下であることが望ましい。
(nD)=(Mw)×{(D)の重量分率/100}/非共役ポリエン(D)の分子量
本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、重量平均分子量(Mw)あたりの、非共役ポリエン(C)および(D)に由来するそれぞれの構成単位の数(nc)および(nD)が、いずれも上記の範囲を満たす場合には、エチレン・α-オレフィン・非共役ポリエン共重合体(S)が、長鎖分岐含有量が少なく、かつ、エチレン・α-オレフィン・非共役ポリエン共重合体(S)を含む組成物をヒドロキシ架橋を行う場合の架橋速度が速く、得られる架橋成形体の機械的特性などの物性バランスに優れるとともに、後架橋を生じにくく特に耐熱老化性に優れたものとなるため好ましい。
本発明に係るエチレン・α-オレフィン・非共役ポリエン共重合体(S)は、エチレン(A)と、炭素原子数3~20のα-オレフィン(B)と、前記一般式(I)および(II)からなる群から選ばれる部分構造を合計で分子中に2つ以上含む非共役ポリエン(C)と、必要に応じて前記一般式(I)および(II)からなる群から選ばれる部分構造を合計で分子中に1つのみ2含む非共役ポリエン(D)とからなるモノマーを共重合してなる共重合体である。
本発明に係るヒドロシリル基含有化合物(Y)は、エチレン・α-オレフィン・非共役ポリエン共重合体(S)などの末端二重結合を有する重合体と反応して架橋剤として作用する。このヒドロシリル基含有化合物(Y)は、従来から製造・市販されている、例えば、線状、環状、分岐状の各構造あるいは三次元網目状構造の樹脂状物など、その構造においていずれでも使用可能であるが、本発明で用いるヒドロシリル基含有化合物(Y)は、1分子中に少なくとも2個のヒドロシリル基を含んでいなければならない。
R4 bHcSiO(4-b-c)/2
で表わされる化合物を使用することができる。
(式中のdは2以上の整数である。)
分子鎖両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体としては、下式で示される化合物、さらには下式においてメチル基の一部または全部をエチル基、プロピル基、フェニル基、トリフロロプロピル基等で置換した化合物などが挙げられる。
(式中のeは1以上の整数であり、fは2以上の整数である。)
分子鎖両末端シラノール基封鎖メチルハイドロジェンポリシロキサンとしては、例えば下式で示される化合物、さらには下式においてメチル基の一部または全部をエチル基、プロピル基、フェニル基、トリフロロプロピル基等で置換した化合物などが挙げられる。
(式中のeは1以上の整数である。)
分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖メチルハイドロジェンポリシロキサンとしては、例えば下式で示される化合物、さらには下式においてメチル基の一部または全部をエチル基、プロピル基、フェニル基、トリフロロプロピル基等で置換した化合物などが挙げられる。
(式中のeは1以上の整数である。)
分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体としては、例えば下式で示される化合物、さらには下式においてメチル基の一部または全部をエチル基、プロピル基、フェニル基、トリフロロプロピル基等で置換した化合物などが挙げられる。
(式中のeおよびhは、それぞれ1以上の整数である。)
以上のような化合物は、公知の方法により製造することができ、例えばオクタメチルシクロテトラシロキサンおよび/またはテトラメチルシクロテトラシロキサンと、末端基となり得るヘキサメチルジシロキサンあるいは1,3-ジハイドロ-1,1,3,3- テトラメチルジシロキサンなどの、トリオルガノシリル基あるいはジオルガノハイドロジェンシロキシ基を含む化合物とを、硫酸、トリフルオロメタンスルホン酸、メタンスルホン酸等の触媒の存在下に、-10℃~+40℃程度の温度で平衡化させることによって容易に得ることができる。
本発明で用いるヒドロシリコン架橋用の白金系触媒(Z)は、付加反応触媒であり、末端二重結合を有する重合体、好ましくは前記エチレン・α-オレフィン・非共役ポリエン共重合体(S)が有するアルケニル基と、ヒドロシリル基含有化合物(Y)のヒドロシリル基との付加反応(アルケンのヒドロシリル化反応)を促進するものであれば、特に制限はなく使用することができる。
本発明で用いる反応抑制剤(D)は、末端二重結合を有する重合体、好ましくは前記エチレン・α-オレフィン・非共役ポリエン共重合体(S)が有するアルケニル基と、ヒドロシリル基含有化合物(Y)のヒドロシリル基との架橋反応(アルケンへのヒドロシリル化付加反応)を抑制する。この架橋反応の抑制は、混練時および成形時での加工性を安定にする点で必要である。
本発明に係る重合体組成物には、上記の必須の配合剤以外に、必要に応じて、補強剤、無機充填剤、軟化剤、老化防止剤(安定剤)、加工助剤、さらには発泡剤、発泡助剤、可塑剤、着色剤、他のゴム配合剤、ゴム、樹脂などを他の成分として配合することができる。それらの配合剤は、用途に応じて、その種類、含有量が適宜選択されるが、これらのうちでも特に補強剤、無機充填剤、軟化剤などを用いることが好ましい。
本発明に係る重合体組成物は、末端二重結合を有する重合体、好ましくは前記エチレン・α-オレフィン・非共役ポリエン共重合体(S)、上記ヒドロシリル基含有化合物(Y)、上記白金系触媒(Z)および反応抑制剤(D)を含む組成物である。
本発明の架橋成形体の製造方法は、本発明に係る重合体組成物を、通常、50~130℃、好ましくは70~110℃の温度範囲で溶融混練し、通常、90~220℃の範囲、100~200℃、好ましくは110~190℃の温度範囲に設定した金型内に射出成形し、一当該金型内で架橋して一段階目の架橋(一次架橋)を行い、次に、射出成形した成形体を金型から取り出した後、熱媒体中等で加熱して二段階目の架橋(二次架橋)を行うことを特徴とする成形体の製造方法である。金型内で架橋する一次架橋の時間は、通常0.5~60秒、好ましくは0.6~40秒、より好ましくは0.7~20秒程度である。
要件(I):前記架橋成形体の中心となる点を(x)、(x)からの距離が最短となる架橋成形体表面上の点を(z)、(x)と(z)を結ぶ線分を2対1に内分する点を(y)としたとき、架橋成形体の(z)から(y)までの表面部架橋密度(A)と、(x)から(y)までの内部架橋密度(B)とが、次の関係式(7)を満たす。
また本発明の架橋成形体は、より好ましくは次の関係式(7’)を満たす。
ここで、架橋成形体の中心とは、一次架橋時の金型接触面から最も離れた点を意味する。
(1)エチレン・α-オレフィン・非共役ポリエン共重合体の組成
エチレン・α-オレフィン・非共役ポリエン共重合体の、各構成単位の重量分率(重量%)およびエチレンとα-オレフィンのモル比は、13C-NMRによる測定値により求めた。測定値は、ECX400P型核磁気共鳴装置(日本電子製)を用いて、測定温度:120℃、測定溶媒:オルトジクロロベンゼン/重水素化ベンゼン=4/1、積算回数:8000回にて、共重合体の13C-NMRのスペクトルを測定して得た。
極限粘度[η](dl/g)は、(株)離合社製全自動極限粘度計を用いて、温度:135℃、測定溶媒:デカリンにて測定した。
重量平均分子量(Mw)、数平均分子量(Mn)、分子量分布(Mw/Mn)は、ゲルパーミエーションクロマトグラフィー(GPC)で測定されるポリスチレン換算の数値である。測定装置および条件は、以下のとおりである。また、分子量は、市販の単分散ポリスチレンを用いて検量線を作成し、換算法に基づいて算出した。
解析装置:Empower2(Waters社製)、
カラム:TSKgel GMH6-HT×2+TSKgel GMH6-HTL×2(7.5mmI.D.×30cm、東ソー社製)、
カラム温度:140℃、
移動相:o-ジクロロベンゼン(0.025%BHT含有)、
検出器:示差屈折計(RI)、流速:1.0mL/min、
注入量:400μL、
サンプリング時間間隔:1s、
カラム較正:単分散ポリスチレン(東ソー社製)、
分子量換算:旧法EPR換算/粘度を考慮した較正法。
レオメーターとして、粘弾性測定装置Ares(Rheometric Scientific社製)を用い、190℃、歪み1.0%の条件で、周波数ω=0.01rad/sでの複素粘度η* (ω=0.01)、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)、周波数ω=10rad/sでの複素粘度η* (ω=10)および周波数ω=100rad/sでの複素粘度η* (ω=100)(いずれも単位はPa・sec)を測定した。
攪拌翼を備えた容積300Lの重合器を用いて、連続的に、エチレン、ブテン、5-ビニル-2-ノルボルネン(VNB)の重合反応を95℃にて行った。
JIS K 6253に従い、架橋シートの硬度(タイプAデュロメータ、HA)の測定は、平滑な表面をもっている2mmの架橋シート6枚を用いて、平らな部分を積み重ねて厚み約12mmとして行った。ただし、試験片に異物の混入したもの、気泡のあるもの、およびキズのあるものは用いなかった。また、試験片の測定面の寸法は、押針先端が試験片の端から12mm以上離れた位置で測定できる大きさとした。
JIS K 6251に従い、測定温度23℃、引張速度500mm/分の条件で引張試験を行い、シートの破断強度(TB)〔MPa〕および破断伸び(EB)〔%〕を測定した。すなわち、シート状の架橋成形体を打抜いてJIS K 6251(2001年)に記載されている3号形ダンベル試験片を調製した。この試験片を用いて同JIS K 6251に規定される方法に従い、測定温度25℃、引張速度500mm/分の条件で引張り試験を行ない、引張破断点応力(TB)および引張破断点伸び(EB)を測定した。
架橋密度νは下記の平衡膨潤を利用したFlory-Rehnerの式(a)から算出した。式(a)中のVRは、架橋した2mmシートを37℃×72hの条件でトルエンで膨潤・抽出して求めた。
t0:試験片の試験前の高さ
t1:試験片を熱処理し30分間放冷した後の高さ
t2:試験片の測定金型に取り付けた状態での高さ
[参考例1]
Mixtron BB-4型ミキサー(神戸製鋼所製)を用いて、製造例1で得たエチレン・ブテン・VNB共重合体(S-1)100質量部を1分間素練りし、次いでこれに、カーボンブラック(旭#60G、旭カーボン(株)社製)40質量部、重質炭酸カルシウム(ホワイトンSB[白石カルシウム(株)製])30質量部、パラフィン系プロセスオイル(ダイアナプロセスPW-380、出光興産(株)製)40質量部、および特殊処理酸化カルシウム(ベスタPP[井上石灰工業(株)製])10質量部を加え、140℃で2分間混練した。その後、ラムを上昇させ掃除を行ない、さらに、1分間混練を行ない、約150℃で排出して配合物を得た。
第一段階として、Mixtron BB-4型ミキサー(神戸製鋼所製)を用いて、製造例1で得たエチレン・ブテン・VNB共重合体(S-1)100質量部を1分間素練りし、次いでこれに、カーボンブラック(旭#60G、旭カーボン(株)社製)40質量部、重質炭酸カルシウム(ホワイトンSB[白石カルシウム(株)製])30質量部、パラフィン系プロセスオイル(ダイアナプロセスPW-380、出光興産(株)製)40質量部、および特殊処理酸化カルシウム(ベスタPP[井上石灰工業(株)製])10質量部を加え、140℃で2分間混練した。その後、ラムを上昇させ掃除を行ない、さらに、1分間混練を行ない、約150℃で排出し、第一段階の配合物を得た。
架橋条件として、ギアオーブンでの架橋を行わない以外は実施例1と同様に行った。
Claims (6)
- 末端二重結合を有する重合体、ヒドロシリル基を1分子中に少なくとも2個持つヒドロシリル基含有化合物(Y)、ヒドロシリコン架橋用の白金系触媒(Z)、および反応抑制剤(D)を含む重合体組成物を溶融混練して、金型内に射出成形し、当該金型内で一次架橋を行い、一次架橋を行った成形体を金型から取り出した後、熱媒体中で二次架橋を行うことを特徴とする架橋成形体の製造方法。
- 前記末端二重結合を有する重合体が、エチレン(A)と、炭素原子数3~20のα-オレフィン(B)と、下記一般式(I)および(II)からなる群から選ばれる部分構造を合計で分子中に2つ以上含む非共役ポリエン(C)とに由来する構成単位を有し、
下記(i)~(v)の要件を満たすエチレン・α-オレフィン・非共役ポリエン共重合体(S)である請求項1に記載の架橋成形体の製造方法。
(ii)非共役ポリエン(C)に由来する構成単位の重量分率が、エチレン・α-オレフィン・非共役ポリエン共重合体(S)100重量%中、0.07重量%~10重量%である。
(iii)エチレン・α-オレフィン・非共役ポリエン共重合体(S)の重量平均分子量(Mw)と、非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率(重量%))と、非共役ポリエン(C)の分子量((C)の分子量)とが、下記式(1)を満たす。
4.5≦Mw×(C)の重量分率/100/(C)の分子量≦40 … 式(1)
(iv)レオメーターを用いて線形粘弾性測定(190℃)により得られた、周波数ω=0.1rad/sでの複素粘度η* (ω=0.1)(Pa・sec)と、周波数ω=100rad/sでの複素粘度η* (ω=100)(Pa・sec)との比P(η* (ω=0.1)/η* (ω=100))と、極限粘度[η]と、前記非共役ポリエン(C)に由来する構成単位の重量分率((C)の重量分率)とが、下記式(2)を満たす。
P/([η]2.9)≦(C)の重量分率×6 … 式(2)
(v)3D-GPCを用いて得られた、1000炭素原子あたりの長鎖分岐数(LCB1000C)と、重量平均分子量(Mw)の自然対数[Ln(Mw)]とが下記式(3)を満たす。
LCB1000C≦1-0.07×Ln(Mw) ‥ 式(3) - 重合体組成物が、上記末端二重結合を有する重合体100質量部に対して、上記ヒドロシリル基含有化合物(Y)が0.1~100質量部、上記白金系触媒(Z)が0.1~100000重量ppm、および上記反応抑制剤(D)が0.05~5質量部の範囲にある請求項1または2に記載の架橋成形体の製造方法。
- 溶融混練する際の温度が、50~130℃の範囲にあり、射出金型の温度が90~220℃の範囲の範囲にあり、熱媒体の温度が90~220℃の範囲にある請求項1~3のいずれかに記載の架橋成形体の製造方法。
- 一次架橋の時間が、0.5~60秒の範囲にある、請求項1~4のいずれかに記載の架橋成形体の製造方法。
- 末端二重結合を有する重合体、
ヒドロシリル基を1分子中に少なくとも2個持つヒドロシリル基含有化合物(Y)、
ヒドロシリコン架橋用の白金系触媒(Z)、および
反応抑制剤(D)
を含み、下記要件(I)を満たす架橋成形体。
要件(I):前記架橋成形体の中心となる点を(x)、(x)からの距離が最短となる架橋成形体表面上の点を(z)、(x)と(z)を結ぶ線分を2対1に内分する点を(y)としたとき、架橋成形体の(z)から(y)までの表面部架橋密度(A)と、(x)から(y)までの内部架橋密度(B)とが、次の関係式(7)を満たす。
(A)/(B)<1.10 …式(7)
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2021027001A (ja) * | 2019-08-08 | 2021-02-22 | 三井化学株式会社 | 燃料電池用ガスケット |
JP7355550B2 (ja) | 2019-08-08 | 2023-10-03 | 三井化学株式会社 | 燃料電池用ガスケット |
JP7481969B2 (ja) | 2020-09-07 | 2024-05-13 | 三井化学株式会社 | ゴム組成物およびその用途 |
JP7554079B2 (ja) | 2020-09-07 | 2024-09-19 | 三井化学株式会社 | ゴム組成物およびその用途 |
JP7554080B2 (ja) | 2020-09-07 | 2024-09-19 | 三井化学株式会社 | ゴム組成物およびその用途 |
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Publication number | Publication date |
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JPWO2019124223A1 (ja) | 2020-11-19 |
EP3730554A1 (en) | 2020-10-28 |
KR20200087234A (ko) | 2020-07-20 |
US11613594B2 (en) | 2023-03-28 |
TW201932525A (zh) | 2019-08-16 |
EP3730554A4 (en) | 2021-09-01 |
TWI848926B (zh) | 2024-07-21 |
CN111479877A (zh) | 2020-07-31 |
US20210179752A1 (en) | 2021-06-17 |
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