Arborescent polymers and process for making same

Abstract

The present invention relates to arborescent polymers and to a process for making same. In one embodiment, the present invention relates to arborescent polymers formed from at least one inimer and at least one isoolefin that have been end-functionalized with a polymer or copolymer having a low glass transition temperature (T g ), and to a process for making such arborescent polymers. In another embodiment, the present invention relates to arborescent polymers formed from at least one inimer and at least one isoolefin that have been end-functionalized with less than about 5 weight percent end blocks derived from a polymer or copolymer having a high glass transition temperature (T g ), and to a process for making such arborescent polymers.

What is claimed is: 
     
         1 . An end-functionalized arborescent polymer comprising:
 an arborescent elastomeric polymer having two or more branching points and a low glass transition temperature (T g ); and   less than about 5 weight percent end blocks derived from a polymer or copolymer having a high glass transition temperature (T g ).   
     
     
         2 . The end-functionalized arborescent polymer of  claim 1 , wherein the end-functionalized arborescent polymer exhibits thermoplastic elastomeric properties. 
     
     
         3 . The end-functionalized arborescent polymer of  claim 1 , wherein the arborescent elastomeric polymer comprises an arborescent polyisoolefin core. 
     
     
         4 . The end-functionalized arborescent polymer of  claim 1 , wherein the arborescent elastomeric polymer is formed from at least one inimer of Formula I:
   A-B  (I)
   
       wherein A is: 
       
         
           
           
               
               
           
         
       
       wherein B is: 
       
         
           
           
               
               
           
         
         R 1 , R 2 , R 3 , R 4 , R 5  and R 6  are each independently selected from the group consisting of hydrogen, halogens, linear or branched C 1  to C 10  alkyls and C 5  to C 5  aryls; or 
         R 1 , R 2  and R 3  are hydrogen; and 
         R 4 , R 5  and R 6  are each independently selected from the group consisting of hydrogen, hydroxyl, bromine, chlorine, fluorine, iodine, ester (—O—C(O)—R 7 ), peroxide (—OOR 7 ), and —O—R 7 , wherein R 7  is unsubstituted linear or branched C 1  to C 20  alkyl, unsubstituted linear or branched C 1  to C 10  alkyl, substituted linear or branched C 1  to C 20  alkyl, substituted linear or branched C 1  to C 10  alkyl, aryl group having from 2 to about 20 carbon atoms, aryl group having from 9 to 15 carbon atoms, substituted aryl group having from 2 to about 20 carbon atoms or substituted aryl group having from 9 to 15 carbon atoms; or 
         any one of R 4 , R 5  and R 6  is chlorine or fluorine and any remaining R 4 , R 5  and R 6  are independently selected from unsubstituted linear or branched C 1  to C 20  alkyls, unsubstituted linear or branched C 1  to C 10  alkyls, substituted linear or branched C 1  to C 20  alkyls and substituted linear or branched C 1  to C 10  alkyls; or 
         any two of R 4 , R 5  and R 6  together form an epoxide and a remaining R group is either hydrogen, unsubstituted linear or branched C 1  to C 10  alkyl, or substituted linear or branched C 1  to C 10  alkyl. 
       
     
     
         5 . The end-functionalized arborescent polymer of  claim 6 , wherein the inimer of Formula (I) comprises either an aryl or alkyl group joining A and B. 
     
     
         6 . The end-functionalized arborescent polymer of  claim 6 , wherein the inimer of Formula (I) comprises a benzene ring joining A and B. 
     
     
         7 . The end-functionalized arborescent polymer of  claim 6 , wherein the inimer of Formula (I) comprises a linkage of Formula (II): 
       
         
           
           
               
               
           
         
         wherein n is an integer in the range of 1 to about 12; 
         joining A and B. 
       
     
     
         8 . The end-functionalized arborescent polymer of  claim 6 , wherein the arborescent elastomeric polymer is formed from at least one inimer selected from the group consisting of 4-(2-hydroxyisopropyl)styrene, 4-(2-methoxyisopropyl)styrene, 4-(1-methoxyisopropyl)styrene, 4-(2-chloroisopropyl)styrene, 4-(2-acetoxyisopropyl)styrene, 2,3,5,6-tertamethyl-4-(2-hydroxy isopropyl)styrene, 3-(2-methoxyisopropyl)styrene, 4-(epoxyisopropyl)styrene, 4,4,6-trimethyl-6-hydroxyl-1-heptene, 4,4,6-trimethyl-6-chloro-1-heptene, 4,4,6-trimethyl-6,7-epoxy-1-heptene, 4,4,6,6,8-pentamethyl-8-hydroxyl-1-nonene, 4,4,6,6,8-pentamethyl-8-chloro-1-nonene, 4,4,6,6,8-pentamethyl-8,9-epoxy-1-nonene, 3,3,5-trimethyl-5-hydroxyl-1-hexene, 3,3,5-trimethyl-5-chloro-1-hexene, 3,3,5-trimethyl-5-6-epoxy-1-hexene, 3,3,5,5,7-pentamethyl-7-hydroxyl-1-octene, 3,3,5,5,7-pentamethyl-7-chloro-1-octene, and 3,3,5,5,7-pentamethyl-7,8-epoxy-1-octene. 
     
     
         9 . The end-functionalized arborescent polymer of  claim 6 , wherein the arborescent elastomeric polymer is formed from at least one of 4-(2-methoxyisopropyl)styrene or 4-(epoxyisopropyl)styrene. 
     
     
         10 . The end-functionalized arborescent polymer of  claim 1 , wherein the arborescent elastomeric polymer is formed from at least one isoolefin of Formula (III): 
       
         
           
           
               
               
           
         
       
       wherein R 9  is C 1  to C 4  alkyl. 
     
     
         11 . The end-functionalized arborescent polymer of  claim 1 , wherein the arborescent elastomeric polymer is formed from isobutylene or 2-methyl-1-butene. 
     
     
         12 . The end-functionalized arborescent polymer of  claim 1 , wherein the high glass transition temperature end-blocks comprise one or more diene monomer selected from the group consisting of butadiene-1,3; 2-methylbutadiene-1,3; 2,4-dimethylbutadiene-1,3; piperyline; 3-methylpentadiene-1,3; hexadiene-2,4; 2-neopentylbutadiene-1,3; 2-methlyhexadiene-1,5; 2,5-dimethyhexadiene-2,4; 2-methylpentadiene-1,4; 2-methylheptadiene-1,6; cyclopentadiene; methylcyclopentadiene; cyclohexadiene; 1-vinyl-cyclohexadiene; and mixtures thereof. 
     
     
         13 . The end-functionalized arborescent polymer of  claim 1 , wherein the high glass transition temperature end-blocks comprise monomeric units derived from monomers selected from the group consisting of isoprene, monovinylidiene arenes, and co-polymers and combinations thereof. 
     
     
         14 . The end-functionalized arborescent polymer of  claim 17 , wherein the monovinylidiene arene monomer is selected from the group consisting of styrene, p-methylstyrene, p-tert-butylstyrene, p-chlorostyrene, indene and mixtures thereof. 
     
     
         15 . The end-functionalized arborescent polymer of  claim 1 , wherein the high glass transition temperature end-blocks comprise less than about 5 weight percent monovinylidiene arene content. 
     
     
         16 . The end-functionalized arborescent polymer of  claim 1 , wherein the high glass transition temperature end-blocks have a number average molecular weight of less than about 10,000 g/mol. 
     
     
         17 . The end-functionalized arborescent polymer of  claim 1 , wherein the end-functionalized arborescent polymer is crosslinked or cured to provide a vulcanized article.