High service temperature adhesives and sealants made with highly functionalized block copolymers

Abstract

The present invention provides high service temperature sealant and adhesive compositions which contain a functionalized selectively hydrogenated block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene to which has been grafted at least 4% by weight of an acid compound or its derivative wherein substantially all of the acid compound or its derivative is grafted to the block copolymer in the conjugated diene blocks. The present invention also contemplates a stable emulsion comprising the above polymer, water and less than 1 part per 100 of the emulsion of a surfactant.

We claim: 
     
       1. A high service temperature sealant composition having a shear adhesion failure temperature of greater than 60° C. and a slump temperature of greater than 70° C. comprising: (a) 100 parts of a functionalized selectively hydrogenated block copolymer of vinyl aromatic hydrocarbon and a conjugated diene to which has been grafted at least 4% by weight of an acid compound or an anhydride, salt, ester, imide, amide, ether, nitrile, acid chloride, thiol, thioacid, glycidyl, cyano, hydroxy, or glycol derivative thereof wherein substantially all of the acid compound or its derivative is grafted to the block copolymer in the conjugated dienes blocks,   (b) 10 to 400 parts of a tackifying resin,   (c) 0 to 150 parts of an endblock reinforcing resin, and   (d) 0 to 150 parts of a plasticizing oil.   
     
     
       2. The sealant composition of claim 1 wherein the acid compound or its derivative is maleic anhydride. 
     
     
       3. A high service temperature adhesive composition having a shear adhesion failure temperature of greater than 60° C. and a slump temperature of greater than 70° comprising: (a) 100 parts of a functionalized selectively hydrogenated block copolymer of vinyl aromatic hydrocarbon and a conjugated diene to which has been grafted at least 4% by weight of an acid compound or an anhydride, salt, ester, imide, amide, ether, nitrile, acid chloride, thiol, thioacid, glycidyl, cyano, hydroxy, or glycol derivative thereof wherein substantially all of the acid compound or its derivative is grafted to the block copolymer in the conjugated dienes blocks,   (b) 10 to 400 parts of a tackifying resin,   (c) 0 to 150 parts of an endblock reinforcing resin, and   (d) 0 to 100 parts of a plasticizing oil.   
     
     
       4. The adhesive composition of claim 3 wherein the acid compound or its derivative is maleic anhydride. 
     
     
       5. A block copolymer emulsion which is stable for at least 7 days comprising: (a) 100 parts of a functionalized selectively hydrogenated block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene to which has been grafted at least 4% by weight of an acid compound or an anhydride, salt, ester, imide, amide, ether, nitrile, acid chloride, thiol, thioacid, glycidyl, cyano, hydroxy, or glycol derivative thereof wherein substantially all of the acid compound or its derivative is grafted to the block copolymer in the conjugated diene blocks,   (d) water, and   (c) less than 1 part per 100 parts of the emulsion of a surfactant.   
     
     
       6. The stable emulsion of claim 5 wherein the acid compound or its derivative is maleic anhydride.