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US 2013/0096265 A1Published application
Miktopolymer compositions
AssigneeKraton Polymers U.S. LLC
InventorsDale Lee HANDLIN, JR., Peter PASMAN, Glenn H. FREDRICKSON, Carl L. WILLIS, Robert C. BENING
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Abstract
The present invention provides a block copolymer composition and method of making the same having the structures (A2-B)n-X-(A1) or (A2-B2)n-X-(B1A1), where A1 and A2 are each a polymer block of a monoalkenyl arene and B, B1, and B2 are each a polymer block of one or more conjugated dienes or a hydrogenated diene polymer, n is an integer from 2 to 30 and X is the residue of a coupling agent.
Claims8
1-16. (canceled)
An elastomeric polymer composition comprising miktopolymers of the structure (A2-B2)n-X-(B1-A1), where
- a. A1 and A2 are each a polymer block of a monoalkenyl arene and B1 and B2 are polymer blocks of one or more conjugated dienes or hydrogenated polymer blocks of one or more conjugated dienes;
- b. n is an integer from 2 to 30;
- and
- c. X is the residue of a coupling agent;
- and wherein:
- i. τ is an asymmetry parameter of monoalkenyl arene associated with the A1 and A2 blocks according to the formula τ=NA1/(NA1+NA2) where NA1 is the number of monomer units in the A1 monoalkenyl arene block and NA2 is the number of monomer units in an A2 monoalkenyl arene block;
- ii. f is the volume fraction of monoalkenyl arene in said miktopolymer;
- iii. τ has a value of 0.7 to 0.95;
- iv. f has a value greater than or equal to 0.5;
- v. block A1 has a peak molecular weight of between 10,000 and 300,000, and the ratio of the peak molecular weight of A1 to A2 is greater than or equal to 2;
- and
- vi. B2 has a peak molecular weight of between 20,000 and 150,000 and B1 has a peak molecular weight of between 200 and 5,000.
9 more elements
Dependencies are inferred from the claim text.