US2011251347A1PendingUtilityA1

Styrene/butadiene diblock copolymer-containing blends that are not an agglomeration and a process for preparation

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Individually held — no corporate assignee on recordPriority: Aug 5, 2008Filed: Aug 5, 2009Published: Oct 13, 2011
Est. expiryAug 5, 2028(~2 yrs left)· nominal 20-yr term from priority
Inventors:Daniel F. GravesPeter W. BoernerJohn R. SchrefflerChristine Rademacher
C08L 2205/025C08L 2205/02C08J 2353/02C08J 2325/10C08J 3/005C08F 297/044C08F 297/04C08L 25/10C08L 3/20C08F 279/02C08F 236/10C08L 53/02
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Claims

Abstract

A process for producing a styrene-butadiene diblock copolymer-containing blend that is not an agglomeration, that involves mixing a styrene-butadiene multiblock thermoplastic elastomer solution with a styrene-butadiene diblock copolymer solution. Blends comprising a styrene-butadiene diblock copolymer and a styrene-butadiene multiblock thermoplastic elastomer, which blends are not an agglomeration.

Claims

exact text as granted — not AI-modified
1 . A process for producing a styrene-butadiene diblock copolymer-comprising blend that is not an agglomeration comprising mixing a first solution of the styrene-butadiene diblock copolymer with a second solution of a styrene-butadiene multiblock thermoplastic elastomer, and drying the resultant mixture, wherein the styrene-butadiene diblock copolymer has a bound styrene content of about 5% to about 60% based on the copolymer, and a block styrene content of about 5% to about 60% based on the copolymer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole, and the styrene-butadiene multiblock thermoplastic elastomer has a bound styrene content of about 20% to about 60% based on the elastomer, a block styrene content of about 20% to about 60% based on the elastomer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole. 
     
     
         2 . The process of  claim 1  wherein the first and second solutions are prepared separately. 
     
     
         3 . The process of  claim 1  wherein the styrene-butadiene diblock copolymer is present in an amount of from about 60% to about 90%, and the styrene-butadiene multiblock thermoplastic elastomer is present in an amount of from about 10% to about 40%. 
     
     
         4 . The process of  claim 1  wherein the styrene-butadiene diblock copolymer has a bound styrene content of about 5% to about 60% based on the copolymer, and a block styrene content of about 5% to about 60% based on the copolymer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole, and wherein the styrene-butadiene multiblock thermoplastic elastomer has a bound styrene content of about 20% to about 60% based on the elastomer, a block styrene content of about 20% to about 60% based on the elastomer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole. 
     
     
         5 . The process of  claim 1  wherein the bound styrene content of the diblock copolymer differs from the bound styrene content of the elastomer. 
     
     
         6 . The process of  claim 1  wherein the block styrene content of the diblock copolymer differs from the block styrene content of the elastomer. 
     
     
         7 . The process of  claim 1  wherein the number average molecular weight (M n ) of the elastomer ranges from about 0.1 to about 2 times the number average molecular molecular weight (M n ) of the diblock copolymer. 
     
     
         8 . A blend comprising a styrene-butadiene diblock copolymer and a styrene-butadiene multiblock thermoplastic elastomer, which blend is not an agglomeration, and wherein the bound styrene content of the diblock copolymer differs from the bound styrene content of the elastomer, and wherein the number average molecular weight (M n ) of the blend ranges from about 40,000 to about 250,000 g/mole. 
     
     
         9 . The blend of  claim 8  wherein the number average molecular weight (M n ) of the thermoplastic elastomer ranges from about 0.5 to about 2 times the number average molecular weight (M n ) of the diblock copolymer. 
     
     
         10 . The blend of  claim 8  wherein the bound styrene content of the thermoplastic elastomer exceeds the bound styrene content of the diblock copolymer. 
     
     
         11 . The blend of  claim 8  wherein the styrene-butadiene diblock copolymer has a bound styrene content of about 5% to about 60% based on the copolymer, a block styrene content of about 5% to about 60% based on the copolymer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole, and the styrene-butadiene multiblock thermoplastic elastomer has a bound styrene content of about 20% to about 60% based on the elastomer, a block styrene content of about 20% to about 60% based on the elastomer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole. 
     
     
         12 . The blend of  claim 8  wherein the styrene-butadiene diblock copolymer is present in an mount of from about 60% to about 90%, and the styrene-butadiene multiblock thermoplastic elastomer is present in an amount of from about 10% to about 40%. 
     
     
         13 . The blend of  claims 8  not being produced in situ in a process. 
     
     
         14 . The blend of  claim 8  not having been produced by a coupling type reaction. 
     
     
         15 . A blend comprising a styrene-butadiene diblock copolymer and a styrene-butadiene multiblock thermoplastic elastomer, which blend is not an agglomeration, and wherein the number average molecular weight (M n ) of the styrene-butadiene multiblock thermoplastic elastomer ranges from about 0.5 to about 2 times the number average molecular weight (M n ) of the styrene-butadiene diblock copolymer. 
     
     
         16 . The blend of  claim 15  wherein the number average molecular weight (M n ) of the elastomer is about equal to the number average molecular weight (M n ) of the diblock copolymer. 
     
     
         17 . The blend of  claim 15  wherein the styrene-butadiene diblock copolymer has a bound styrene content of about 5% to about 60% based on the copolymer, a block styrene content of about 5% to about 60% based on the copolymer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole and the styrene-butadiene multiblock thermoplastic elastomer has a bound styrene content of about 20% to about 60% based on the elastomer, a block styrene content of about 20% to about 60% based on the elastomer, and a number average molecular weight (M n ) of about 40,000 to about 250,000 g/mole. 
     
     
         18 . The blend of  claim 15  wherein the styrene-butadiene diblock copolymer is present in an amount of from about 60% to about 90%, and the styrene-butadiene multiblock thermoplastic elastomer is present in an amount of from about 10% to about 40%. 
     
     
         19 . The blend of  claim 15  not having been produced in situ in a process. 
     
     
         20 . The blend of  claim 15  not having been produced by a coupling type reaction. 
     
     
         21 . The process of  claim 1  wherein the number average molecular weight (M n ) of the styrene-butadiene diblock copolymer is from about 60,000 to about 80,000 g/mole. 
     
     
         22 . The process of  claim 1  wherein the number average molecular weight (M n ) of the styrene-butadiene thermoplastic elastomer is from about 60,000 to about 80,000 g/mole. 
     
     
         23 . A blend produced in accordance to the process of  claim 1 . 
     
     
         24 . The blend of  claim 23  wherein the bound styrene content of the diblock copolymer differs from the bound styrene content of the elastomer by an amount greater than at least about 2%. 
     
     
         25 . A composition comprising a styrene-butadiene diblock copolymer and a styrene-butadiene multiblock thermoplastic elastomer, which composition is not an agglomeration, and wherein the bound styrene content of the diblock copolymer differs from the bound styrene content of the elastomer, and wherein the number average molecular weight (M n ) of the composition is from about 40,000 to about 250,000 g/mole, and wherein the composition comprises at least 95% styrene-butadiene copolymer.

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