Poly-4-methyl-1-pentene resin laminates and uses thereof

Abstract

A poly-4-methyl-1-pentene resin laminate excellent in not only heat sealing properties and oxygen gas permeability but also blocking resistance is provided. The poly-4-methyl-1-pentene resin laminate comprises a layer made of a 4-methyl-1-pentene polymer (A), an intermediate layer made of an adhesive resin composition (B) and a layer made of a propylene polymer composition (C) comprising 60 to 90 parts by weight of a propylene polymer (c-1) and 10 to 40 parts by weight of a 1-butene polymer (c-2), the total amount of said components (c-1) and (c-2) being 100 parts by weight. This poly-4-methyl-1-pentene resin laminate can be used as a material of freshness-keeping packaging media and culture containers. Also provided is a poly-4-methyl-1-pentene resin laminate having excellent peel resistance and capable of being easily controlled in the oxygen gas permeability. This poly-4-methyl-1-pentene resin laminate comprises a layer made of a 4-methyl-1-pentene polymer (A′), an intermediate layer made of an adhesive resin composition (B′) and a layer made of an olefin polymer (C′). This poly-4-methyl-1-pentene resin laminate can be used as a material of containers for keeping freshness of vegetables and fruits.

What is claimed is:  
     
         1 . A poly-4-methyl-1-pentene resin laminate comprising: 
 (I) a layer made of a 4-methy-1-pentene polymer (A′),    (II) an intermediate layer made of an adhesive resin composition (B′), and    (III) a layer made of an olefin polymer (C′).    
     
     
         2 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   , wherein the adhesive resin composition (B′) is a composition comprising a 4-methyl-1-pentene polymer (b-1) and a 1-butene polymer (b-2).  
     
     
         3 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 2   , wherein the adhesive resin composition (B′) is a composition containing the 4-methyl-1-pentene polymer (b-1) in an amount of 40 to 97.5 parts by weight and the 1-butene polymer (b-2) in an amount of 2.5 to 60 parts by weight, the total amount of said components (b-1) and (b-2) being 100 parts by weight.  
     
     
         4 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   , wherein the olefin polymer (C′) is a propylene polymer (c-1), and the adhesive resin composition (B′) is a composition comprising a 4-methyl-1-pentene polymer (b-1) and a 1-butene polymer (b-2) and containing the 4-methyl-1-pentene polymer (b-1) in an amount of 40 to 97.5 parts by weight and the 1-butene polymer (b-2) in an amount of 2.5 to 60 parts by weight, the total amount of said components (b-1) and (b-2) being 100 parts by weight.  
     
     
         5 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   , wherein the adhesive resin composition (B′) is a composition comprising a 4-methyl-1-pentene polymer (b-1), a 1-butene polymer (b-2) and a propylene polymer (b-3).  
     
     
         6 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 5   , wherein the adhesive resin composition (B′) is a composition containing the 4-methyl-1-pentene polymer (b-1) in an amount of 40 to 97.5 parts by weight and the 1-butene polymer (b-2) in an amount of 2.5 to 60 parts by weight, the total amount of said component (b-1) and (b-2) being 100 parts by weight, and containing the propylene polymer (b-3) in an amount of 1 to 100 parts by weight based on 100 parts by weight of the total amount of the components (b-1) and (b-2).  
     
     
         7 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   , wherein the olefin polymer (C′) is a propylene polymer (c-4), and the adhesive resin composition (B′) is a composition comprising a 4-methyl-1-pentene polymer (b-1), a 1-butene polymer (b-2) and a propylene polymer (b-3), containing the 4-methyl-1-pentene polymer (b-1) in an amount of 40 to 97.5 parts by weight and the 1-butene polymer (b-2) in an amount of 2.5 to 60 parts by weight, the total amount of said components (b-1) and (b-2) being 100 parts by weight, and containing the propylene polymer (b-3) in an amount of 1 to 100 parts by weight based on 100 parts by weight of the total amount of the components (b-1) and (b-2).  
     
     
         8 . The poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   , wherein the olefin polymer (C′) is an ethylene polymer (c-5), and the adhesive resin composition (B′) is a composition comprising a 4-methyl-1-pentene polymer (b-1), a 1-butene polymer (b-2), and ethylene/butene copolymer (b-4), and optionally, a propylene/butene copolymer (b-5) and containing the 4-methyl-1-pentene polymer (b-1) in an amount of 20 to 60 parts by weight, the 1-butene polymer (b-2) in an amount of 5 to 40 parts by weight, the ethylene/butene copolymer (b-4) in an amount of 30 to 60 parts by weight and the propylene/butene copolymer (b-5) in an amount of 0 to 30 parts by weight, the total amount of said components (b-1), (b-2), (b-4) and (b-5) being 100 parts by weight.  
     
     
         9 . A packaging medium having excellent oxygen permeability, which comprises the poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   .  
     
     
         10 . A packaging medium for keeping freshness of vegetables and fruits, which comprises the poly-4-methyl-1-pentene resin laminate as claimed in    claim 1   .