Butadiene polymers having terminal functional groups
View Patent ↗Hydrogenated butadiene polymers having terminal functional groups have minimum viscosity at any molecular weight when the 1,2-addition is between 30% and 70%. Hydrogenated butadiene polymers having about two terminal hydroxyl groups per molecule have surprisingly lower viscosities at 30% to 70% 1,2-addition than similar polymers having either higher or lower amounts of 1,2-addition. The polymers are useful in making coatings, sealants, binders, and block copolymers with polyesters, polyamides, and polycarbonates.
1. A polymer, consisting essentially of:
polymerized 1,3-butadiene having a peak molecular weight between 500 and 20,000, 1,2-addition between 30% and 70%, and hydrogenation of at least 90% of the unsaturation;
the polymer has a ratio of viscosity ( poise at room temperature ) to peak molecular weight raised to the 3 . 4 power of at most 2 . 0 .times. 10 −9 ; and
one the polymer has about two or more terminal functional groups per molecule.
2. The polymer of claim 1 6 , wherein the terminal functional groups are selected from a group consisting of hydroxyl, carboxyl, phenol, epoxy, and amine groups.
3. The polymer of claim 2 , wherein the polymer has a ratio of viscosity (poise at room temperature) to peak molecular weight raised to the 3.4 power of at most 2.0×10 −9 .
4. The polymer of claim 3 1 , wherein the polymerized butadiene has a peak molecular weight between 1,000 and 10,000.
5. The polymer of claim 4 , wherein the polymerized butadiene is at least 95% hydrogenated.
6. The polymer of claim 5 1 , wherein the ratio of viscosity to peak molecular weight raised to the 3.4 power is less than 1.0× .times. 10 −9 .
7. The polymer of claim 6 , wherein the terminal functional groups consist of about two hydroxyl groups per molecule.
8. The polymer of claim 1 6 , wherein the peak molecular weight is between 1000 and 10000.
9. The polymer of claim 8 , wherein the 1,2-addition of the polymerized butadiene is between 40% and 60%.
10. A polymer, comprising:
polymerized 1,3-butadiene having a peak molecular weight between 500 and 20000, hydrogenation of at least 90% of the unsaturation, and 1,2-addition between 30% and 70%;
the polymer has a ratio of viscosity ( poise at room temperature ) to peak molecular weight raised to the 3 . 4 power of at most 2 . 0 .times. 10 −9 ; and
the polymer has about two terminal functional groups per molecule.
11. The polymer of claim 10 17 , wherein the terminal functional groups are selected from a group consisting of hydroxyl, carboxyl, phenol, epoxy, and amine groups.
12. The polymer of claim 11 , wherein the polymerized butadiene is at least 95% hydrogenated.
13. The polymer of claim 12 , wherein the ratio of viscosity (poise at room temperature) to peak molecular weight raised to the 3.4 power is at most 2.0×10 −9 .
14. The polymer of claim 13 12 , wherein the terminal functional groups are hydroxyl groups.
15. The polymer of claim 14 , wherein the peak molecular weight is between 1000 and 10000.
16. The polymer of claim 15 , wherein the 1,2-addition of the polymerized butadiene is between 40% and 60%.
17. The polymer of claim 10 , wherein the ratio of viscosity to peak molecular weight raised to the 3 . 4 power is less than 1 . 0 .times. 10 −9 .
18. The polymer of claim 4 wherein the wherein the polymerized butadiene has a peak molecular weight of about 10 , 000 .
19. The polymer of claim 4 wherein the wherein the polymerized butadiene has a peak molecular weight of about 5 , 000 .
20. The polymer of claim 4 wherein the wherein the polymerized butadiene has a peak molecular weight of about 3 , 000 .
21. The polymer of claim 4 wherein the wherein the polymerized butadiene has a peak molecular weight of about 2 , 000 .
22. The polymer of claim 15 wherein the wherein the polymerized butadiene has a peak molecular weight of about 10 , 000 .
23. The polymer of claim 15 wherein the wherein the polymerized butadiene has a peak molecular weight of about 5 , 000 .
24. The polymer of claim 15 wherein the wherein the polymerized butadiene has a peak molecular weight of about 3 , 000 .
25. The polymer of claim 15 wherein the wherein the polymerized butadiene has a peak molecular weight of about 2 , 000 .
26. The polymer of claim 10 wherein the polymer has 1 . 7 terminal functional groups per molecule.
27. The polymer of claim 10 wherein the polymer has 1 . 9 terminal functional groups per molecule.