Cycloolefin block copolymers and a process for their preparation

• US 5,475,060 A
• Filed: 05/10/1994
• Issued: 12/12/1995
• Est. Priority Date: 02/18/1993
• Status: Expired due to Fees

• Current Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Rohrmann, Jurgen, Osan, Frank, Brekner, Michael-Joachim
• Primary Examiner(s): JAGANNATHAN, VASUDEVAN SALEM
• Application Number:
  US08/240,823
• Time in Patent Office: 581 Days
• Field of Search: 525/289, 525/297, 525/88, 525/95, 525/97
• US Class Current: 525/289
• CPC Class Codes: C08F 210/02 Ethene
• CPC Class Codes: C08F 232/00 Copolymers of cyclic compounds containing no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic ring system
• CPC Class Codes: C08F 2500/03 Narrow molecular weight distribution, i.e. Mw/Mn < 3
• CPC Class Codes: C08F 2500/25 Cycloolefine
• CPC Class Codes: C08F 297/08 polymerising mono-olefins

Abstract

Cycloolefin block copolymers and a process for their preparation Cycloolefin block copolymers, which in particular are suitable as phase promoters, are preferably obtained by copolymerization of polycyclic olefins, such as norbornene, with acyclic olefins, such as ethylene, by, at a molecular weight distribution M_w /M_n of the polymer block forming of less than 2, changing the reaction conditions one or more times in such a way that the monomer/comonomer ratio changes by at least 10% or a further polymerizable monomer is metered into the monomer or the monomers.

Claims

1. A norbornene/ethylene block copolymer, in which each polymer block is made up of a copolymer of norbornene and ethylene.

2. A polymer composition comprising a plurality of phases, said composition containing a cycloolefin block copolymer as claimed in claim 1 as a phase promoter.

3. A method of blending cycloolefin copolymers, comprising:

introducing a cycloolefin block copolymer as claimed in claim 1, into a polymer blend comprising a cycloolefin copolymer as a blending compound therefor.

4. A tetracyclododecene/ethylene block copolymer, in which each polymer block is made up of a copolymer of tetracyclododecene and ethylene.

5. A polymer composition comprising a plurality of phases, said composition containing a cycloolefin block copolymer as claimed in claim 4 as a phase promoter.

6. A method of blending cycloolefin copolymers, comprising:

introducing a cycloolefin block copolymer as claimed in claim 4, into a polymer blend comprising a cycloolefin copolymer as a blending compound therefor.