JP5735827B2 - 粘度指数向上剤、潤滑油用添加剤および潤滑油組成物 - Google Patents
粘度指数向上剤、潤滑油用添加剤および潤滑油組成物 Download PDFInfo
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- JP5735827B2 JP5735827B2 JP2011064151A JP2011064151A JP5735827B2 JP 5735827 B2 JP5735827 B2 JP 5735827B2 JP 2011064151 A JP2011064151 A JP 2011064151A JP 2011064151 A JP2011064151 A JP 2011064151A JP 5735827 B2 JP5735827 B2 JP 5735827B2
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- lubricating oil
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- methacrylate
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- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N naphthalene-acid Natural products C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- CQRYARSYNCAZFO-UHFFFAOYSA-N o-hydroxybenzyl alcohol Natural products OCC1=CC=CC=C1O CQRYARSYNCAZFO-UHFFFAOYSA-N 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- BVJSUAQZOZWCKN-UHFFFAOYSA-N p-hydroxybenzyl alcohol Chemical compound OCC1=CC=C(O)C=C1 BVJSUAQZOZWCKN-UHFFFAOYSA-N 0.000 description 1
- YOTGRUGZMVCBLS-UHFFFAOYSA-N pentadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCOC(=O)C(C)=C YOTGRUGZMVCBLS-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920013639 polyalphaolefin Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 238000012712 reversible addition−fragmentation chain-transfer polymerization Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- ATZHWSYYKQKSSY-UHFFFAOYSA-N tetradecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCOC(=O)C(C)=C ATZHWSYYKQKSSY-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- KRLHYNPADOCLAJ-UHFFFAOYSA-N undecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCOC(=O)C(C)=C KRLHYNPADOCLAJ-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
- C10M145/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M145/10—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate
- C10M145/12—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate monocarboxylic
- C10M145/14—Acrylate; Methacrylate
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1818—C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate
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- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
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- C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
- C10M159/005—Macromolecular compounds, e.g. macromolecular compounds composed of alternatively specified monomers not covered by the same main group
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- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/08—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing non-conjugated dienes
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
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- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
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- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
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- C10N2010/12—Groups 6 or 16
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- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/04—Molecular weight; Molecular weight distribution
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- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/073—Star shaped polymers
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- C10N2030/54—Fuel economy
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/68—Shear stability
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- C10N2070/00—Specific manufacturing methods for lubricant compositions
Description
[1]ジビニルベンゼンと、ステアリルメタアクリレート(n−オクタデシルメタアクリレート、メタクリル酸ステアリルまたはメタクリル酸n−オクタデシルとも呼ばれる)を含むアルキルメタアクリレートとを反応させて得られる、ジビニルベンゼンに由来するコア部およびアルキルメタアクリレートの重合鎖であるアーム部を有する星型重合体を含有する、粘度指数向上剤。
[2]上記アルキルメタアクリレートに占めるステアリルメタアクリレートの比率が、アルキルメタアクリレート全量を基準として、40〜100質量%である、[1]に記載の粘度指数向上剤。
[3]上記アルキルメタアクリレートに占めるメチルメタアクリレートの比率が、アルキルメタアクリレート全量を基準として、0〜50質量%である、[1]または[2]に記載の粘度指数向上剤。
[4]上記アルキルメタアクリレートに占める炭素数10〜16のアルキル基を有するアルキルメタアクリレートの比率が、アルキルメタアクリレート全量を基準として、0〜40質量%である、[1]〜[3]のいずれか一項に記載の粘度指数向上剤。
[5]上記アーム部の数平均分子量が10,000〜60,000である、[1]〜[4]のいずれか一項に記載の粘度指数向上剤。
[6]上記星型重合体の数平均分子量が50,000〜1,000,000である、[1]〜[5]のいずれか一項に記載の星型粘度指数向上剤。
[7][1]〜[6]のいずれか一項に記載の粘度指数向上剤を含む潤滑油用添加剤。
[8]潤滑油基油と、[1]〜[6]のいずれか一項に記載の粘度指数向上剤とを含有する潤滑油組成物
[9]150℃におけるHTHS粘度が1.4mPa・s以上であり、かつ100℃におけるHTHS粘度が5.4mPa・s未満である、[8]に記載の潤滑油組成物。
さらに、本発明によれば、内燃機関に使用される燃料がガソリンまたはディーゼル燃料のいずれであるかを問わず、上記の効果を得ることができる。
本発明の第1実施形態に係る粘度指数向上剤は、ジビニルベンゼンと、ステアリルメタアクリレートを含むアルキルメタアクリレートとを反応させて得られる、ジビニルベンゼンに由来するコア部およびアルキルメタアクリレートの重合鎖であるアーム部を有する星型重合体を含有する。
ATRP重合の重合体機構の論述は、Matyjaszewskiらの524ページの反応スキーム11.1、566ページの反応スキーム11.4、571ページの反応スキーム11、7、572ページの反応スキーム11.8および575ページの反応スキーム11.9で示されている。
RAFT重合の重合体機構の論述は、Matyjaszewskiらの12.4.4節の664〜665ページで示されている。
窒素酸化物媒介重合(10章、463〜522ページ)、ATRP(11章、523〜628ページ)およびRAFT(12章、629〜690ページ)の詳細な説明は、「Handbookof Radical Polymerization」(Krzysztof Matyjaszewski and Thomas P.Davis著、著作権2002、JohnWiley and Sons Inc.により出版(以下、「Matyjaszewskiら」と呼ぶ)で示されている。
本発明の第2実施形態に係る潤滑油用添加剤は、上記第1実施形態に係る粘度指数向上剤を含有する。
フェノール系酸化防止剤としては、例えば、4,4'−メチレンビス(2,6−ジ−tert−ブチルフェノール)、4,4’−ビス(2,6−ジ−tert−ブチルフェノール)、4,4'−ビス(2−メチル−6−tert−ブチルフェノール)、2,2'−メチレンビス(4−エチル−6−tert−ブチルフェノール)、2,2'−メチレンビス(4−メチル−6−tert−ブチルフェノール)、4,4'−ブチリデンビス(3−メチル−6−tert−ブチルフェノール)、4,4’−イソプロピリデンビス(2,6−ジ−tert−ブチルフェノール)、2,2’−メチレンビス(4−メチル−6−ノニルフェノール)、2,2'−イソブチリデンビス(4,6−ジメチルフェノール)、2,2’−メチレンビス(4−メチル−6−シクロヘキシルフェノール)、2,6−ジ−tert−ブチル−4−メチルフェノール、2,6−ジ−tert−ブチル−4−エチルフェノール、2,4−ジメチル−6−tert−ブチルフェノール、2,6−ジ−tert−α−ジメチルアミノ−p−クレゾール、2,6−ジ−tert−ブチル−4−(N,N−ジメチルアミノメチルフェノール)、4,4'−チオビス(2−メチル−6−tert−ブチルフェノール)、4,4'−チオビス(3−メチル−6−tert−ブチルフェノール)、2,2'−チオビス(4−メチル−6−tert−ブチルフェノール)、ビス(3−メチル−4−ヒドロキシ−5−tert−ブチルベンジル)スルフィド、ビス(3,5−ジ−tert−ブチル−4−ヒドロキシベンジル)スルフィド、2,2'−チオ−ジエチレンビス[3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート]、トリデシル−3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート、ペンタエリスリチル−テトラキス[3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート]、オクチル−3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート、ステアリル3−(3,5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート、オクチル−3−(3−メチル−5−ジ−tert−ブチル−4−ヒドロキシフェニル)プロピオネート等が好ましく挙げられる。これらは二種以上を混合して使用してもよい。
アミン系酸化防止剤としては、例えば、芳香族アミン化合物、アルキルジフェニルアミン、アルキルナフチルアミン、フェニル−α−ナフチルアミン、アルキルフェニル−α−ナフチルアミン等の潤滑油用として一般に使用されている公知のアミン系酸化防止剤が挙げられる。
本発明の第3実施形態に係る潤滑油組成物は、潤滑油基油と、上記第1実施形態に係る粘度指数向上剤とを含有する。当該潤滑油組成物は、上記第2実施形態の説明で例示した他の添加剤をさらに含有してもよい。
る。
さらに、本添加剤の効果を発揮するため基油のクロマト分析による飽和分は好ましくは80%以上、より好ましくは85%以上、さらに好ましいのは90%以上、最も好ましいのは95%以上である。
窒素入口、中速機械攪拌機、熱電対および水冷式冷却器を備え付けた容器(反応フラスコ)にて、室温、窒素の流量28.3L/hrの条件下で、メチルメタアクリレートおよびステアリルメタアクリレートの混合物(混合比率:メチルメタアクリレート/ステアリルメタアクリレート=60/40(質量比))、AIBN開始剤(1当量)、ジチオ安息香酸クミル(2当量)およびオイルを混合した。このとき、混合を確実にするために、N2ブランケット下にて、20分間撹拌した。その後、窒素の流量を14.2L/hrまで低下させ、混合物を4時間にわたって90℃まで加熱した。次に、容器内にジビニルベンゼンを添加し、その混合物を90℃で12時間撹拌し、目的の星型重合体(以下、場合によりPMA1という。)を得た。
得られた星型重合体について、ゲルパーミエーションクロマトグラフィー(GPC、ポリスチレン換算)により、アーム部及び星型重合体の数平均分子量を測定した。また、星型重合体に添加された重合体の量に基づいて、星形重合体の平均アーム数および星形重合体への転化率を求めた。得られた結果を表1に示す。
分子量の測定方法は以下の通り実施した。得られた星型重合体をTHF溶媒(テトラヒドロフラン)に1mass%になるように溶解し、移動相にTHF、検出器としてRI(屈折率)を用い、流速0.5ml/min、カラム温度40℃にて測定を実施した。検量線は市販標準試薬のポリスチレンを使用し、10000〜500000までのリテンションタイムを測定し分子量分布決定に用いた。
実施例2、3及び比較例1〜3においては、それぞれ実施例1におけるメチルメタアクリレートおよびステアリルメタアクリレートの混合物に代えて、表1に示す組成を有するアルキルメタアクリレートを用いたこと以外は実施例1と同様にして、星型重合体の合成を行った(以下、場合により、得られた星型重合体をPMA2〜6という。)。
得られた各星型重合体についてのアーム部の数平均分子量、星型重合体の数平均分子量、星形重合体の平均アーム数、ならびに星形重合体への転化率を表1に示す。
実施例4〜6および比較例4〜6においては、それぞれ潤滑油基油としてのグループIII基油(SK YUBASE−4)にパッケージ添加剤(8mass%:無灰分散剤3mass%,金属系清浄剤 3mass%、ZDTP 1mass%、MoDTC 0.4mass%、アミン系酸化防止剤 0.6mass%)を配合し、さらに、エンジン油の規格である0W−20を満たすようにPMA1〜6のいずれかを添加して、潤滑油組成物を得た。各潤滑油組成物の組成及び各種性状を表2に示す。なお、表2中、「Y.S.」は降伏応力(Yield Stress)を意味する。
実施例4の潤滑油組成物について、せん断安定性をSONIC法で評価した。試験前後の粘度比(試験後の動粘度を試験前の動粘度で除した値)を表3に示す。
撹拌装置、加熱装置、冷却装置、温度計、窒素吹き込み管および滴下槽を備えた反応容器に、トルエンを1,500質量部仕込み、85℃に温調し窒素置換を60分行った。次に、メタクリル酸メチル1700質量部、メタクリル酸n−ドデシルエステル1020質量部、メタクリル酸2−メチルウンデシルエステル255質量部、メタクリル酸n−トリデシルエステル1020質量部、メタクリル酸2−メチルドデシルエステル255質量部、メタクリル酸n−テトラデシルエステル1224質量部、メタクリル酸2−ドデシルエステル306質量部、メタクリル酸n−ペンタデシルエステル1224質量部、メタクリル酸2−メチルテトラデシルエステル306質量部、およびメタクリル酸n−ヘキサデシルエステル830質量部の混合物(合計8,500質量部)、重合開始剤として2,2’−アゾビス(2,4−ジメチルバレロニトリル)4質量部および2,2’−アゾビス(2−メチルブチロニトリル)17質量部を滴下槽に仕込み、密閉下85℃で2時間かけて等速で滴下槽の溶液を滴下して重合反応を行った。引き続き、85℃で2時間熟成し、120℃、20mmHgの減圧度でトルエンを留去し、直鎖型ポリメタアクリレート(以下、場合によりVM1という)を得た。
次に、得られたVMA1を粘度指数向上剤として用い、表3に示す潤滑油組成物を調製し、上記と同様の超音波せん断安定性試験を実施した。得られた結果を表3に示す。
実施例1におけるメチルメタアクリレートおよびステアリルメタアクリレートの混合物に代えて、C12〜15メタクリレート(70重量%)およびメタクリル酸2−エチルヘキシル(30重量%)の混合物を用いたこと、ならびにAIBN開始剤(1当量)に代えてTrigonox(商標)−21(「T−21」)開始剤(1当量)を用いたこと以外は実施例1と同様にして、星型重合体(以下、場合によりVM2という)を合成した。
次に、得られたVM2を粘度指数向上剤として用い、表3に示す潤滑油組成物を調製し、上記と同様の超音波せん断安定性試験を実施した。得られた結果を表3に示す。
Claims (8)
- ジビニルベンゼンと、ステアリルメタアクリレートおよびメチルメタアクリレートを含むアルキルメタアクリレートとを反応させて得られる、前記ジビニルベンゼンに由来するコア部および前記アルキルメタアクリレートの重合鎖であるアーム部を有する星型重合体を含有し、
前記アルキルメタアクリレートに占める前記ステアリルメタアクリレートの比率が、前記アルキルメタアクリレート全量を基準として、40〜70質量%である、粘度指数向上剤。 - 前記アルキルメタアクリレートに占める前記メチルメタアクリレートの比率が、前記アルキルメタアクリレート全量を基準として、50質量%以下である、請求項1に記載の粘度指数向上剤。
- 前記アルキルメタアクリレートに占める炭素数10〜16のアルキル基を有するアルキルメタアクリレートの比率が、前記アルキルメタアクリレート全量を基準として、0〜40質量%である、請求項1または2に記載の粘度指数向上剤。
- 前記アーム部の数平均分子量が10,000〜60,000である、請求項1〜3のいずれか一項に記載の粘度指数向上剤。
- 前記星型重合体の数平均分子量が50,000〜1,000,000である、請求項1〜4のいずれか一項に記載の粘度指数向上剤。
- 請求項1〜5のいずれか一項に記載の粘度指数向上剤を含む潤滑油用添加剤。
- 潤滑油基油と、請求項1〜5のいずれか一項に記載の粘度指数向上剤とを含有する潤滑油組成物。
- 150℃におけるHTHS粘度が1.4mPa・s以上であり、かつ100℃におけるHTHS粘度が5.4mPa・s未満である、請求項7に記載の潤滑油組成物。
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CN201280014612.5A CN103443258B (zh) | 2011-03-23 | 2012-03-23 | 粘度指数改进剂、润滑油用添加剂以及润滑油组合物 |
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US20150203785A1 (en) * | 2012-07-24 | 2015-07-23 | Jx Nippon Oil & Energy Corporation | Lubricating oil composition |
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