Acrylic-containing diene copolymers in adhesives, sealants and coatings

Abstract

A hot melt adhesive composition comprising a tackifying resin and a polymer which comprises at least one conjugated diolefin and at least one acrylic monomer such as an alkyl methacrylate.

I claim: 
     
       1. A hot melt adhesive composition comprising a tackifying resin and a block comprising at least one conjugated diolefin block having a molecular weight from 20,000 to 175,000, at least one vinyl aromatic hydrocarbon block having a molecular weight from 4,000 to 30,000 and at least one acrylic monomer block having a molecular weight from 100 to 30,000 with the structure ##STR3## wherein R 1  is selected from the group consisting of hydrogen, phenyl and alkyl radicals which are linear or branched and contain from 1 to 10 carbon atoms, and R 2  is a cyclic or non-cyclic alkyl radical which is branched at the first carbon atom, contains from 1 to 14 carbon atoms and may contain a tertiary amine or an ether linkage. 
     
     
       2. The composition of claim 1 wherein the tackifying resin comprises from about 10 parts to about 400 parts by weight per 100 parts rubber. 
     
     
       3. The composition of claim 1 wherein the acrylic monomer block is derivatized and is selected from the group consisting of polyacrylic acids, polyacrylic anhydrides, unconverted ester functional forms and mixtures thereof. 
     
     
       4. The composition of claim 1 wherein the polymer is selectively hydrogenated. 
     
     
       5. An assembly adhesive composition comprising the composition of claim 1. 
     
     
       6. A mastic comprising the composition of claim 1 and a solvent. 
     
     
       7. A sealant composition comprising the composition of claim 1 and a solvent. 
     
     
       8. A coating composition comprising the composition of claim 1 and a solvent. 
     
     
       9. A high temperature pressure sensitive adhesive made with the composition of claim 1 and a suitable crosslinking agent. 
     
     
       10. The composition of claim 1 which additionally comprises from 10 to 60 weight % of a diblock of the vinyl aromatic hydrocarbon and the conjugated diolefin. 
     
     
       11. The composition of claim 1 wherein the acrylic monomer is an alkyl methacrylate. 
     
     
       12. The composition of claim 11 wherein the alkyl methacrylate is tertiary butyl methacrylate. 
     
     
       13. A pressure sensitive made with the composition of claim 1. 
     
     
       14. A tape comprising the composition of claim 13 and a backing material. 
     
     
       15. A label comprising the composition of claim 13 and a backing material. 
     
     
       16. The composition of claim wherein the polymer is a linear A-B-A-acrylic monomer block copolymer wherein A is a vinyl aromatic hydrocarbon and B is a conjugated diene. 
     
     
       17. The composition of claim 16 which additionally comprises 15 to 50 weight % of a coupled A-B-A-acrylic monomer-A-B-A block copolymer. 
     
     
       18. The composition of claim 16 wherein A is styrene and B is isoprene. 
     
     
       19. The composition of claim 18 wherein the acrylic monomer is an alkyl methacrylate. 
     
     
       20. The composition of claim 19 wherein the alkyl methacrylate is tertiary butyl methacrylate.