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1. 发明授权

US5118875A Method of preparing alkyl phenol-formaldehyde condensates 失效
标题翻译：制备烷基酚 - 甲醛缩合物的方法
公开(公告)号：US5118875A
公开(公告)日：1992-06-02
申请号：US595228
申请日：1990-10-10
申请人： David J. Martella , John J. Jaruzelski , Frank J. Chen
发明人： David J. Martella , John J. Jaruzelski , Frank J. Chen
IPC分类号： C08G8/04 , C10L1/14 , C10L1/16 , C10L1/18 , C10L1/198 , C10L1/20 , C10L1/22 , C10L1/24 , C10L1/26 , C10L1/30 , C10M145/20 , C10M151/04
CPC分类号： C10L1/1981 , C08G8/04 , C10L1/143 , C10L1/2493 , C10M145/20 , C10M151/04 , C10L1/1616 , C10L1/1641 , C10L1/165 , C10L1/1658 , C10L1/1666 , C10L1/1814 , C10L1/1828 , C10L1/1881 , C10L1/1883 , C10L1/1886 , C10L1/189 , C10L1/1963 , C10L1/1966 , C10L1/198 , C10L1/207 , C10L1/223 , C10L1/2364 , C10L1/2368 , C10L1/238 , C10L1/2383 , C10L1/2412 , C10L1/2425 , C10L1/2437 , C10L1/2481 , C10L1/265 , C10L1/2691 , C10L1/301 , C10L1/303 , C10M2209/101 , C10M2221/00 , C10M2221/041 , C10N2240/02 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106
摘要： Additives of improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the alkylation of a phenol in the presence of a polar aprotic cosolvent to produce an essentially linear alkylated phenol which is condensed with an aldehyde to produce the low temperature flow improver wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole percent of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole percent of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties and oxidative stability are significantly improved thereby, are also disclosed.
摘要翻译：公开了改进烃油的低温流动性能和氧化稳定性的添加剂，其包括在极性非质子共溶剂存在下苯酚的烷基化以产生基本上线性的烷基化苯酚，其与醛缩合以产生低温流动改进剂，其中：（a）聚合物组合物具有至少约3,000的数均分子量和至少约1.5的分子量分布; （b）在烷基化酚反应物中，烷基（i）基本上是线性的; （ii）具有6至50个碳原子; 和（iii）平均碳原子数在约12和26之间; 和（c）不超过约10摩尔％的烷基化苯酚上的烷基具有小于12个碳原子，不超过约10摩尔％的烷基化苯酚上的烷基具有多于26个碳原子。添加剂也可以以支链骨架形式制备，其中单体反应物与某些三官能或四官能团共聚单体共聚。还公开了这些添加剂与各种烃油的混合物，特别是各种中间馏分和润滑油组合物，其低温流动性能和氧化稳定性由此显着提高。

2. 发明授权

US5268524A Preparation of linear alkyl aromatics 失效
标题翻译：线性烷基芳烃的制备
公开(公告)号：US5268524A
公开(公告)日：1993-12-07
申请号：US950866
申请日：1992-09-24
申请人： David J. Martella , John J. Jaruzelski , Frank J. Chen
发明人： David J. Martella , John J. Jaruzelski , Frank J. Chen
IPC分类号： C07B37/02 , C07B37/04 , C07C2/66 , C07C37/14
CPC分类号： C07C37/14 , C07B37/02 , C07B37/04 , C07C2/66 , C07C2529/06
摘要： Essentially linear alkyl aromatics wherein the alkyl is attached to the aromatic ring at the .beta.-position are produced by the process wherein a linear hydrocarbon selected from the group consisting of linear .alpha.-olefins, linear .alpha.-substituted alkyl halides or linear .alpha.-substituted alkyl alcohol or mixtures of such olefins, halides or alcohols are reacted with an aromatic compound in the presence of an aprotic-polar cosolvent.
摘要翻译：其中烷基连接到β-位上的芳香环的基本上直链的烷基芳族化合物是通过以下方法生产的，其中选自直链α-烯烃，直链α-取代的烷基卤化物或直链α-取代的烷基在非质子极性助溶剂的存在下，醇或这些烯烃，卤化物或醇的混合物与芳族化合物反应。

3. 发明授权

US5262508A Process for preparing alkyl phenol-sulfur condensate lubricating oil additives 失效
标题翻译：烷基酚 - 硫磺缩合物润滑油添加剂的制备方法
公开(公告)号：US5262508A
公开(公告)日：1993-11-16
申请号：US930134
申请日：1992-08-13
申请人： David J. Martella , John J. Jaruzelski , Frank J. Chen
发明人： David J. Martella , John J. Jaruzelski , Frank J. Chen
IPC分类号： C07C37/14 , C07G99/00 , C08G75/14 , C10L1/24 , C10M151/04 , F02B75/02 , C08G59/00 , C08G63/78 , C08G65/38 , C10M105/08
CPC分类号： C07C37/14 , C07G17/004 , C08G75/14 , C10L1/2481 , C10M151/04 , C10M2221/02 , C10N2240/00 , C10N2240/02 , C10N2240/06 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106 , C10N2240/22 , C10N2240/30 , C10N2240/50 , C10N2240/52 , C10N2240/54 , C10N2240/56 , C10N2240/58 , C10N2240/60 , C10N2240/66 , C10N2270/02 , F02B2075/025
摘要： Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the alkylation of a phenol in the presence of a dipolar aprotic cosolvent to produce an essentially linear alkylated phenol which is condensated with a sulphurizing agent to produce the low temperature flow improver wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole percent of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole percent of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties and oxidative stability are significantly improved thereby, are also disclosed.
摘要翻译：公开了用于改善烃油的低温流动性能和氧化稳定性的添加剂，其包括在偶极非质子助溶剂存在下苯酚的烷基化以产生基本上线性的烷基化苯酚，其与硫化剂缩合以产生低温度流动改进剂，其中：（a）聚合物组合物具有至少约3,000的数均分子量和至少约1.5的分子量分布; （b）在烷基化酚反应物中，烷基（i）基本上是线性的; （ii）具有6至50个碳原子; 和（iii）平均碳原子数在约12和26之间; 和（c）不超过约10摩尔％的烷基化苯酚上的烷基具有小于12个碳原子，不超过约10摩尔％的烷基化苯酚上的烷基具有多于26个碳原子。添加剂也可以以支链骨架形式制备，其中单体反应物与某些三官能或四官能团共聚单体共聚。还公开了这些添加剂与各种烃油的混合物，特别是各种中间馏分和润滑油组合物，其低温流动性能和氧化稳定性由此显着提高。

4. 发明授权

US5236608A Alkyl phenol-sulfur condensates as fuel and lubricating oil additives 失效
标题翻译：烷基酚 - 硫缩合物作为燃料和润滑油添加剂
公开(公告)号：US5236608A
公开(公告)日：1993-08-17
申请号：US561895
申请日：1990-08-02
申请人： David J. Martella , John J. Jaruzelski
发明人： David J. Martella , John J. Jaruzelski
IPC分类号： C08G75/14 , C10L1/24 , C10M151/04
CPC分类号： C10L1/2475 , C08G75/14 , C10M151/04 , C10M2203/10 , C10M2203/102 , C10M2221/04 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/06 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106 , C10N2240/40
摘要： Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and sulfurizing agent, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole percent of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole percent of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are compolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties and oxidative stability are significantly improved thereby, are also disclosed.
摘要翻译：公开了用于改进烃油的低温流动性能和氧化稳定性的添加剂，其包括烷基化苯酚和硫化剂的缩合反应产物，其中：（a）聚合物组合物的数均分子量为至少约3,000，分子量分布至少约1.5; （b）在烷基化酚反应物中，烷基（i）基本上是线性的; （ii）具有6至50个碳原子; 和（iii）平均碳原子数在约12和26之间; 和（c）不超过约10摩尔％的烷基化苯酚上的烷基具有小于12个碳原子，不超过约10摩尔％的烷基化苯酚上的烷基具有多于26个碳原子。添加剂也可以以支链骨架形式制备，其中单体反应物与某些三官能或四官能团共聚单体共聚。还公开了这些添加剂与各种烃油的混合物，特别是各种中间馏分和润滑油组合物，其低温流动性能和氧化稳定性由此显着提高。

5. 发明授权

US5082470A Alkyl phenol-formaldehyde condensates as fuel additives 失效
标题翻译：烷基苯酚 - 甲醛缩合物作为燃料添加剂
公开(公告)号：US5082470A
公开(公告)日：1992-01-21
申请号：US630062
申请日：1990-12-19
申请人： David J. Martella , John J. Jaruzelski
发明人： David J. Martella , John J. Jaruzelski
IPC分类号： C08G8/08 , C10L1/198 , C10L1/24 , C10M145/20 , C10M151/04
CPC分类号： C10L1/1981 , C08G8/08 , C10L1/2475 , C10M145/20 , C10M151/04 , C10M2203/10 , C10M2203/102 , C10M2209/101 , C10M2221/04 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/06 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106 , C10N2240/40
摘要： Additives for improving the low temperature flow properties of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and aldehyde, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole % of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole % of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be sulfurized, or produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties are significantly improved thereby, are also disclosed.
摘要翻译：公开了用于改进烃油的低温流动性质的添加剂，其包括烷基化酚和醛的缩合反应产物，其中：（a）聚合物组合物的数均分子量为至少约3,000，分子量分布至少约1.5; （b）在烷基化酚反应物中，烷基（i）基本上是线性的; （ii）具有6至50个碳原子; 和（iii）平均碳原子数在约12和26之间; 和（c）不超过约10摩尔％的烷基化苯酚上的烷基具有小于12个碳原子，不超过约10摩尔％的烷基化苯酚上的烷基具有多于26个碳原子。添加剂也可以被硫化，或以支链骨架形式制备，其中单体反应物与某些三官能或四官能共聚单体共聚。还公开了这些添加剂与各种烃油，特别是各种中间馏分和润滑油组合物的混合物，其低温流动性能由此显着改善。

6. 发明授权

US5039437A Alkyl phenol-formaldehyde condensates as lubricating oil additives 失效
标题翻译：烷基苯酚 - 甲醛缩合物作为润滑油添加剂
公开(公告)号：US5039437A
公开(公告)日：1991-08-13
申请号：US107507
申请日：1987-10-08
申请人： David J. Martella , John J. Jaruzelski
发明人： David J. Martella , John J. Jaruzelski
IPC分类号： C08G8/08 , C08G8/12 , C10L1/192 , C10L1/198 , C10L1/20 , C10L1/24 , C10L10/08 , C10L10/14 , C10M145/20 , C10M147/04 , C10M151/04 , C10M159/12 , C10N20/04 , C10N30/02 , C10N30/10 , C10N40/04 , C10N40/08 , C10N60/10
CPC分类号： C10L10/16 , C08G8/08 , C10L1/1981 , C10L1/2475 , C10M145/20 , C10M151/04 , C10M2203/10 , C10M2203/102 , C10M2209/101 , C10M2221/04 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106 , C10N2240/40
摘要： Additives for improving the low temperature flow properties of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and aldehyde, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole % of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole % of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be sulfurized, or produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties are significantly improved thereby, are also disclosed.

7. 发明授权

US4976882A Alkyl phenol-sulfur condensates as fuel and lubricating oil additives 失效
标题翻译：烷基酚 - 硫缩合物作为燃料和润滑油添加剂
公开(公告)号：US4976882A
公开(公告)日：1990-12-11
申请号：US107457
申请日：1987-10-08
申请人： David J. Martella , John J. Jaruzelski
发明人： David J. Martella , John J. Jaruzelski
IPC分类号： B01J29/06 , C08G75/14 , C10L1/192 , C10L1/198 , C10L1/24 , C10L10/08 , C10L10/14 , C10M151/04 , C10M159/12 , C10N20/04 , C10N30/02 , C10N30/10 , C10N40/04 , C10N60/10
CPC分类号： C10M151/04 , C08G75/14 , C10L1/2475 , C10M2203/10 , C10M2203/102 , C10M2221/04 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/102 , C10N2240/103 , C10N2240/104 , C10N2240/106 , C10N2240/40
摘要： Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and sulfurizing agent, wherein:(a) the polymer composition has a number average molecular weight of at least about 3,000 and a molecular weight distribution of at least about 1.5;(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear; (ii) have between 6 and 50 carbon atoms; and (iii) have an average number of carbon atoms between about 12 and 26; and(c) not more than about 10 mole percent of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than about 10 mole percent of the alkyl groups on the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are copolymerized with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties and oxidative stability are significantly improved thereby, are also disclosed.

8. 发明授权

US06679987B1 Process for decreasing the acid content and corrosivity of crudes 失效
标题翻译：降低原油酸度和腐蚀性的工艺
公开(公告)号：US06679987B1
公开(公告)日：2004-01-20
申请号：US09432742
申请日：1999-11-02
申请人： Saul Charles Blum , Guido Sartori , David William Savage , Martin Leo Gorbaty , Bruce Henry Ballinger , Michael Paul Anderson , Trikur Anantharaman Ramanarayanan , David J. Martella
发明人： Saul Charles Blum , Guido Sartori , David William Savage , Martin Leo Gorbaty , Bruce Henry Ballinger , Michael Paul Anderson , Trikur Anantharaman Ramanarayanan , David J. Martella
IPC分类号： C10G2906
CPC分类号： C10G75/02 , C10G19/00 , C10G19/02
摘要： The invention relates to processes for treating acidic crudes or fractions thereof to reduce or eliminate their acidity and corrosivity by addition of suitable amounts of Group IA or Group IIA oxides, hydroxides and hydrates and Group IIA metal naphthenate salts. The process has the additional benefits of reducing materials handling problems associated with treating acidic crude oils using liquid solvents and in reducing emulsion formation.
摘要翻译：本发明涉及通过加入适量的IA族或IIA族氧化物，氢氧化物和水合物以及IIA族金属环烷酸盐来处理酸性原油或其馏分来降低或消除其酸度和腐蚀性的方法。该方法具有减少与使用液体溶剂处理酸性原油相关的材料处理问题并减少乳液形成的附加益处。

9. 发明授权

US06583247B1 Process for producing free radical polymerized copolymers 有权
标题翻译：制备自由基聚合共聚物的方法
公开(公告)号：US06583247B1
公开(公告)日：2003-06-24
申请号：US09270376
申请日：1999-03-16
申请人： Ariel Alvarino , Ricardo A. Bloch , David J. Martella , John V. Redpath , James M. Gardiner , Steven W. McKeown , Arunas T. Lapinas
发明人： Ariel Alvarino , Ricardo A. Bloch , David J. Martella , John V. Redpath , James M. Gardiner , Steven W. McKeown , Arunas T. Lapinas
IPC分类号： C08J428
CPC分类号： C10L1/1963 , C10L1/1966 , C10L1/1973 , C10M143/02 , C10M145/08 , C10M145/14 , C10M145/16 , C10M2205/022 , C10M2209/062 , C10M2209/084 , C10M2209/086
摘要： Process for the copolymerization of free radical polymerizable comonomers such as vinyl acetate with an unsaturated diester such as diakyl fumarate which is carried out in the presence of water to produce copolymers such as fumarate vinyl acetate copolymers useful as lubricating oil and fuel oil additives, for example, as wax crystal modifiers and flow improvers.
摘要翻译：用于将可自由基聚合的共聚单体如乙酸乙烯酯与不饱和二酯如富马酸二戊酯共聚的方法，其在水存在下进行，以产生共聚物，例如用作润滑油的富马酸乙酸乙烯酯共聚物和燃料油添加剂，例如，作为蜡晶体改性剂和流动改进剂。

10. 发明授权

US5939365A Lubricant with a higher molecular weight copolymer lube oil flow improver 失效
标题翻译：润滑剂具有较高分子量共聚物润滑油流动改进剂
公开(公告)号：US5939365A
公开(公告)日：1999-08-17
申请号：US771791
申请日：1996-12-20
申请人： John V. Redpath , Arunas T. Lapinas , David J. Martella , Albert Rossi , William M. Davis
发明人： John V. Redpath , Arunas T. Lapinas , David J. Martella , Albert Rossi , William M. Davis
IPC分类号： C10M101/00 , C10M145/14 , C10M157/00 , C10M169/04 , C10N20/04 , C10N30/02 , C10N40/04 , C10M157/10
CPC分类号： C10M157/00 , C10M169/04 , C10M2203/10 , C10M2203/1006 , C10M2203/102 , C10M2203/1025 , C10M2203/1045 , C10M2203/1065 , C10M2203/1085 , C10M2205/00 , C10M2205/022 , C10M2205/024 , C10M2205/04 , C10M2209/06 , C10M2209/084 , C10M2209/086 , C10N2240/00 , C10N2240/04 , C10N2240/042 , C10N2240/044 , C10N2240/046 , C10N2240/08 , C10N2240/10 , C10N2240/101 , C10N2240/104 , C10N2240/105 , C10N2240/106 , C10N2240/14 , C10N2240/22 , C10N2240/30 , C10N2240/50 , C10N2240/52 , C10N2240/54 , C10N2240/56 , C10N2240/58 , C10N2240/60 , C10N2240/66
摘要： A lubricant which comprises: a mineral oil basestock which has been dewaxed via catalytic cracking and/or catalytic isomerization; an alkylene-alkylene copolymer; and a lubricating oil flow improver formed from the reaction product of: (a) an unsaturated carboxy ester formed via the esterification of an unsaturated carboxylic acid or its corresponding anhydride with a monohydric aliphatic alcohol having an average carbon number of between about 10 to 18, the unsaturated carboxy ester having the formula: ##STR1## wherein R' is selected from the group consisting of hydrogen and COOR and wherein R is a C.sub.6 to C.sub.22 alkyl group; and (b) a monomer selected from the group consisting of(i) a vinyl ester having the formula: ##STR2## wherein R.sub.1 comprises an alkyl group containing from 1 to 18 carbon atoms;(ii) an olefin having the formula ##STR3## wherein R.sub.1 and R.sub.2 can independently be hydrogen, an alkyl having from 1 to 28 carbon atoms, or a substituted aryl group, provided both R.sub.1 and R.sub.2 are not hydrogen,the reaction product having a specific viscosity in the range between about 0.3 to 1.5, or a weight average molecular weight of between about 50,000 to 350,000 Daltons.
摘要翻译：一种润滑剂，其特征在于，包括：通过催化裂化和/或催化异构化脱蜡的矿物油基料; 亚烷基 - 亚烷基共聚物; 和由以下反应产物形成的润滑油流动改进剂：（a）通过不饱和羧酸或其相应的酸酐与平均碳数为约10至18的一元脂族醇的酯化形成的不饱和羧酸酯，所述不饱和羧酸酯具有下式：其中R'选自氢和COOR，并且其中R是C6至C22烷基; 和（b）选自（i）具有下式的乙烯基酯的单体：其中R 1包含含有1至18个碳原子的烷基; （ii）具有下式的烯烃：其中R 1和R 2可以独立地为氢，具有1至28个碳原子的烷基或取代的芳基，只要R1和R2都不为氢，反应产物的比粘度约0.3至1.5的范围，或重量平均分子量在约50,000至350,000道尔顿之间。

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