Butadiene polymers having terminal functional groups

Abstract

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 composition, produced by the steps of:
 reacting one or more compounds with the terminal functional groups on a polymer, and said polymer consists 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;  
 a ratio of viscosity ( in poise at room temperature )  to peak molecular weight raised to the  3 . 4  power of at most  2 . 0  times  10     −9 ; and  
 oneabout two or more terminal functional groups per molecule.  
 
 
     
     
       2. The polymer composition of claim  1    6 , wherein the terminal functional groups of the polymer are selected from a  the 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 composition of claim  3    6 , wherein the polymerized  1 , 3 -butadiene has a peak molecular weight between 1,000 and 10,000. 
     
     
       5. The polymer composition of  claim 4 , wherein the polymerized  1 , 3 -butadiene is at least 95% hydrogenated. 
     
     
       6. The polymer composition of claim  5    1 , wherein the ratio of viscosity to peak molecular weight raised to the 3.4 power of the polymer is less than  1.0 ×  times  10 −9 . 
     
     
       7. The polymer composition of  claim 6 , wherein the terminal functional groups of the polymer consist of about two hydroxyl groups per molecule. 
     
     
       8. The polymer composition of  claim 1 , wherein the peak molecular weight of the polymer is between 1000 and 10000. 
     
     
       9. The polymer composition of claim  8    6 , wherein the 1,2-addition of the polymerized  1 , 3 -butadiene is between 40% and 60%. 
     
     
       10. The polymer composition of  claim 1 , wherein the polymerized 1,3-butadiene has about two hydroxyl groups per molecule. 
     
     
       11. The polymeric  polymer composition of  claim 10 , wherein the polymerized 1,3-butadiene is reacted with compounds that form a coating. 
     
     
       12. The polymeric  polymer composition of  claim 10 , wherein the polymerized 1,3-butadiene is reacted with compounds that form a block selected from the group consisting of polyesters, polyamides, and polycarbonates. 
     
     
       13. The polymer composition of  claim 8  wherein the polymer has a peak molecular weight of about  10 , 000 . 
     
     
       14. The polymer composition of  claim 8  wherein the polymer has a peak molecular weight of about  5 , 000 . 
     
     
       15. The polymer composition of  claim 8  wherein the polymer has a peak molecular weight of about  3 , 000 . 
     
     
       16. The polymer composition of  claim 8  wherein the polymer has a peak molecular weight of about  2 , 000 . 
     
     
       17. The polymer composition of  claim 4  wherein the polymer has a peak molecular weight of about  10 , 000 . 
     
     
       18. The polymer composition of  claim 4  wherein the polymer has a peak molecular weight of about  5 , 000 . 
     
     
       19. The polymer composition of  claim 4  wherein the polymer has a peak molecular weight of about  3 , 000 . 
     
     
       20. The polymer composition of  claim 4  wherein the polymer has a peak molecular weight of about  2 , 000 . 
     
     
       21. The polymer composition of  claim 1  wherein the polymerized  1 , 3 - butadiene has  1 . 7  terminal functional groups per molecule.   
     
     
       22. The polymer composition of  claim 1  wherein the polymerized  1 , 3 - butadiene has  1 . 9  terminal functional groups per molecule.