Polymer blends

Abstract

Polymer blends of improved properties for use in packaging applications comprise blends of a crystalline poly(1-butene) and a selectively hydrogenated block copolymer of vinyl aromatic hydrocarbon and conjugated alkadiene of the SEBS type.

What is claimed is: 
     
       1. A laminate film having superior stress-strain and optical properties produced from a polymer blend comprising a crystalline poly(1-butene) and a selectively hydrogenated block copolymer of a vinyl aromatic hydrocarbon and a conjugated alkadiene. 
     
     
       2. The film laminate of claim 1 wherein the blend is a core layer and the outer layers are nylon, polyester, polypropylenes, polyethylene or ethylenically-unsaturated ester copolymers. 
     
     
       3. The film laminate of claim 2 wherein the outer layers are ethylene-vinyl acetate copolymer. 
     
     
       4. The blend of claim 1 wherein the selectively hydrogenated block copolymer is a block copolymer derived from a base block copolymer having at least one block of at least predominantly polymerized styrene or o-methylstyrene and at least one block of at least predominantly polymerized butadiene or isoprene, wherein no more than about 25% of the aromatic unsaturation has been hydrogenated and from about 88% to about 99% of the aliphatic unsaturation has been hydrogenated. 
     
     
       5. The blend of claim 4 wherein the weight ratio of poly(1-butene) to selectivity hydrogenated block copolymer is from about 5:1 to about 1:5. 
     
     
       6. The blend of claim 5 wherein the poly(1-butene) contains up to about 30% mole of other α-olefin of up to 14 carbon atoms inclusive. 
     
     
       7. The blend of claim 6 wherein the base block copolymer from which the selectively hydrogenated block copolymer is derived is of the SBS type. 
     
     
       8. The blend of claim wherein the poly(1-butene) is homopolymeric. 
     
     
       9. The blend of claim 8 wherein the selectively hydrogenated block copolymer is of the SEBS type. 
     
     
       10. A three-layer film laminate wherein the outer layers are nylon, polyester, polypropylenes, polyethylenes or ethylenically-unsaturated ester copolymers and the core layer is the blend of claim 9. 
     
     
       11. The film laminate of claim 10 wherein the outer layers are ethylene-vinyl acetate copolymer.