US5369175A
Expired / Lapsed
US
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Method for preparing asymmetric radial copolymers having four first arms and two second arms
Assignee: Kraton Polymers US LLC
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Filing: 1993-11-09
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Granted: 1994-11-29
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Expires: 2013-11-09
Abstract
Abstract A method for preparing asymmetric radial polymers wherein the different polymeric arms are contacted sequentially with a coupling agent. The method narrows the relative arm distribution of the several asymmetric radial polymers produced and significantly increases the amount of total product having the desired ratio of polymeric arms. Any coupling agent known in the prior art to be useful in the production of asymmetric radial polymers may be used in the method of this invention but coupling agents having from three to about twelve functional groups are most effective.
Inventors
- 👤 Ronald J. Hoximeier
- 👤 Bridget A. Spence
- 👤 Steven S. Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:34
CPC Classifications
C; C08; C08L; C08L53/00; C08L53/02; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
147 words
A method for preparing an asymmetric radial polymer comprising the steps of: (a) contacting a first conjugated diene polymer having a single reactive end group per molecule with a coupling agent containing six functional groups which will react with the reactive end group such that said first conjugated diene polymer reacts with four of the functional groups on each molecule of the coupling agent; (b) contacting a second conjugated diene polymer having a single reactive end group per molecule with the reaction product from step (a) under conditions such that reaction between said second polymer and the reaction product from step (a) proceeds substantially to completion; and (c) recovering an asymmetric radial polymer having at least 75% by weight of six-arm radial polymer molecules having a ratio of four polymeric arms from the first conjugated diene polymer to two polymeric arms from the second conjugated diene polymer.
Claim 2
Independent Claim
147 words
A method for preparing an asymmetric radial polymer comprising the steps of: (a) contacting a first conjugated diene polymer having a single reactive end group per molecule with a coupling agent containing six functional groups which will react with the reactive end group such that said first conjugated diene polymer reacts with four of the functional groups on each molecule of the coupling agent; (b) contacting a second conjugated diene polymer having a single reactive end group per molecule with the reaction product from step (a) under conditions such that reaction between said second polymer and the reaction product from step (a) proceeds substantially to completion; and (c) recovering an asymmetric radial polymer having at least 75% by weight of six-arm radial polymer molecules having a ratio of four polymeric arms from the first conjugated diene polymer to two polymeric arms from the second conjugated diene polymer.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the coupling agent comprises six halogen functional groups.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein the first conjugated diene polymer comprises living isoprene homopolymer and the second conjugated diene polymer comprises living polystyrene-polyisoprene diblock copolymers.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein said coupling agent contains six chlorine functional groups.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein said coupling agent is Cl 3 Si--(CH 2 ) 2 --SiCl 3 .
Claim 7
Dependent Claim
32 words
The method of claim 5 wherein the living isoprene homopolymers have weight average molecular weights from 1,000 to 150,000, the living block copolymers have weight average molecular weights from 1,000 to 150,000.
Claim 8
Dependent Claim
147 words
An asymmetric radial polymer prepared with a method comprising the steps of: (a) contacting a first conjugated diene polymer having a single reactive end group per molecule with a coupling agent containing six functional groups which will react with the reactive end group such that said first conjugated diene polymer reacts with four of the functional groups on each molecule of the coupling agent; (b) contacting a second conjugated diene polymer having a single reactive end group per molecule with the reaction product from step (a) under conditions such that reaction between said second polymer and the reaction product from step (a) proceeds substantially to completion; and (c) recovering an asymmetric radial polymer having at least 75% by weight of six-arm radial polymer molecules having a ratio of four polymeric arms from the first conjugated diene polymer to two polymeric arms from the second conjugated diene polymer.
Claim 9
Dependent Claim
147 words
An asymmetric radial polymer prepared with a method comprising the steps of: (a) contacting a first conjugated diene polymer having a single reactive end group per molecule with a coupling agent containing six functional groups which will react with the reactive end group such that said first conjugated diene polymer reacts with four of the functional groups on each molecule of the coupling agent; (b) contacting a second conjugated diene polymer having a single reactive end group per molecule with the reaction product from step (a) under conditions such that reaction between said second polymer and the reaction product from step (a) proceeds substantially to completion; and (c) recovering an asymmetric radial polymer having at least 75% by weight of six-arm radial polymer molecules having a ratio of four polymeric arms from the first conjugated diene polymer to two polymeric arms from the second conjugated diene polymer.
Claim 10
Dependent Claim
16 words
The asymmetric radial polymer of claim 7 wherein the coupling agent comprises six halogen functional groups.
Claim 11
Dependent Claim
28 words
The asymmetric radial polymer of claim 8 wherein the first conjugated diene polymer comprises living isoprene homopolymer and the second conjugated diene polymer comprises living polystyrene-polyisoprene diblock copolymers.
Claim 12
Dependent Claim
16 words
The asymmetric radial polymer of claim 9 wherein said coupling agent contains six chlorine functional groups.
Claim 13
Dependent Claim
21 words
The asymmetric radial polymer of claim 10 wherein said coupling agent is Cl 3 Si--(CH 2 ) 2 --SiCl 3 .
Claim 14
Dependent Claim
34 words
The asymmetric radial polymer of claim 11 wherein the living isoprene homopolymers have weight average molecular weights from 1,000 to 150,000, the living block copolymers have weight average molecular weights from 1,000 to 150,000.
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