公开(公告)号：WO1996025442A1

公开(公告)日：1996-08-22

申请号：PCT/US1996001852

申请日：1996-02-12

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  WOODSON, Gary, E. ,  ESNEAULT, Calvin, P. ,  MYERS, Michael, O. ,  MARCHAND, Gary, R.

IPC: C08F297/04

CPC classification number: C08F297/04

Abstract: The invention is a process for the preparation of tapered block copolymers according to one of the formulae: B-t-A or A-B-t-A, wherein A comprises a polymer block derived from one or more monovinylidene aromatic monomers, B comprises a polymer block derived from one or more conjugated dienes, and t is a tapered polymer block derived from one or more monovinylidene aromatic monomers and one or more conjugated dienes wherein the portion of the block closest to block A is rich in monovinylidene aromatic monomer units, the portion of the block closest to block B is rich in conjugated diene units and the relative amount of conjugates diene and monovinylidene aromatic monomer units gradually changes along the backbone of the tapered block, comprising: a) contacting one or more conjugated dienes with a monofunctional lithium alkyl initiator or a polymer block derived from monovinylidene aromatic monomers with a terminal living lithium anion capable of initiating anionic polymerization and a hydrocarbon solvent, in a closed reactor equipped with a reflux condenser under conditions of reflux; b) partially polymerizing the one or more conjugated dienes; and c) after step b), contacting with the reaction mixture one or more monovinylidene aromatic monomers under conditions such that the unreacted conjugated diene and monovinylidene monomers polymerize; wherein the materials condensed during the process are recycled to the reactor.

Abstract translation: 本发明是一种制备根据下式之一的锥形嵌段共聚物的方法：BtA或ABtA，其中A包含衍生自一种或多种单亚乙烯基芳族单体的聚合物嵌段，B包含衍生自一种或多种共轭二烯 ，t是衍生自一种或多种单亚乙烯基芳族单体和一种或多种共轭二烯的渐缩聚合物嵌段，其中最接近嵌段A的嵌段的部分富含单亚乙烯基芳族单体单元，最接近嵌段B的嵌段的部分为 富含共轭二烯单元和共轭二烯和单亚乙烯基芳族单体单元的相对量沿着锥形嵌段的主链逐渐变化，包括：a）使一种或多种共轭二烯与单官能的烷基锂引发剂或衍生自单亚乙烯基的聚合物嵌段 具有末端活性的锂离子能引发阴离子聚合的芳族单体和 在回流条件下装备有回流冷凝器的封闭反应器中; b）部分聚合所述一种或多种共轭二烯; 和c）在步骤b）之后，使反应混合物与一种或多种单亚乙烯基芳族单体在未反应的共轭二烯和单亚乙烯基单体聚合的条件下接触; 其中在该过程中冷凝的材料被再循环到反应器中。

公开(公告)号：WO1996016122A1

公开(公告)日：1996-05-30

申请号：PCT/US1995012873

申请日：1995-10-18

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  ESNEAULT, Calvin, P. ,  UZEE, Andre, J. ,  CALLAGHAN, Thomas, A.

IPC: C08L53/02

CPC classification number: C08J5/18 ,  C08J2325/08 ,  C08J2353/02 ,  C08L53/02 ,  D01F6/46 ,  D01F6/56 ,  D04H1/42 ,  C08L2666/04

Abstract: The invention is a composition useful in preparing elastomeric articles which comprises: (a) from 70 to 95 parts by weight of one or more monovinylidene aromatic monomer conjugated diene block copolymer(s) and (b) from 5 to 30 parts by weight of a thermoplastic polymer comprising one or more of: i) a copolymer comprising a monovinylidene aromatic monomer and an anhydride; ii) polystyrene; iii) polyethylene; iv) an ethylene vinyl acetate copolymer, or a mixture thereof. At least 40 percent by weight of the block copolymers have the conjugated diene block comprised of isoprene. The weight percent of monovinylidene aromatic monomer in the block copolymer is from 10 to 35 percent by weight and the total block copolymer composition contains no more than 4 percent by weight of a diblock. The total parts of block copolymer and thermoplastic polymer is 100 parts. Films prepared from the composition exhibit a creep compliance of 1.5 MPa or less, a retention of 60 percent or greater as measured according to ASTM-D2991 at 30 minutes, and a permanent deformation of 10 percent or less as measured according to ASTM-D4649. In another embodiment, the invention comprises elastomeric articles comprising the composition of the invention.

Abstract translation: 本发明是一种可用于制备弹性体制品的组合物，其包括：（a）70至95重量份的一种或多种单亚乙烯基芳族单体共轭二烯嵌段共聚物和（b）5至30重量份的 包含以下一种或多种的热塑性聚合物：i）包含单亚乙烯基芳族单体和酸酐的共聚物; ii）聚苯乙烯; iii）聚乙烯; iv）乙烯乙酸乙烯酯共聚物或其混合物。 至少40重量％的嵌段共聚物具有由异戊二烯组成的共轭二烯嵌段。 嵌段共聚物中单亚乙烯基芳族单体的重量百分数为10至35重量％，并且总嵌段共聚物组合物含有不超过4重量％的二嵌段。 嵌段共聚物和热塑性聚合物的总份数为100份。 由组合物制备的薄膜在30分钟时显示出1.5MPa -1以下的蠕变柔量，根据ASTM-D2991测定的保持率为60％以上，永久变形为10％以下，根据 ASTM-D4649。 在另一个实施方案中，本发明包括包含本发明组合物的弹性制品。