Polyolefin-based compositions, adhesives, and multi-layered structures thereof

Abstract

The present disclosure provides a polyolefin-based composition suitable for use as adhesives and/or tie-layer adhesive compositions as well as a multi-layered structure made from and/or containing the polyolefin-based composition. The polyolefin-based composition is made from and/or contains (a) a grafted polyolefin composition, (b) a first polymer composition, (c) a polypropylene-containing blend composition, and (d) optionally, an additives composition having one or more additives.

What is claimed is: 
     
         1 . A polyolefin-based composition comprising:
 (a) a grafted polyolefin composition comprising a polyolefin grafted with an unsaturated monomer;   (b) a first polymer composition comprising a first polyolefin polymer;   (c) a polypropylene-containing blend composition comprising a polypropylene-containing blend; and   (d) optionally, an additives composition having one or more additives.   
     
     
         2 . The polyolefin-based composition of  claim 1  wherein the polyolefin grafted with an unsaturated monomer is a polypropylene grafted with maleic anhydride. 
     
     
         3 . The polyolefin-based composition of  claim 1  wherein the first polyolefin polymer being selected from the group consisting of polyethylene polymers and polypropylene polymers. 
     
     
         4 . The polyolefin-based composition of  claim 3  wherein the first polyolefin polymer is a polypropylene impact random copolymer. 
     
     
         5 . The polyolefin-based composition of  claim 1  wherein the polypropylene-containing blend comprises:
 (a) from about 10 to about 90 weight percent a semicrystalline polypropylene and 
 (b) from about 10 to about 90 weight percent an ethylene propylene rubber having a total content of ethylene-derived units in an amount from about 20 to about 65 weight percent, based upon the total weight of the ethylene propylene rubber. 
 
     
     
         6 . The polyolefin-based composition of  claim 5  wherein the polypropylene-containing blend is a heterophasic propylene-based copolymer selected from the group consisting of
 (a) an olefin polymer composition consisting essentially of
 (i) from about 10 to about 60 weight percent, based on the total weight of the olefin polymer composition, of
 (A) a propylene homopolymer with isotactic index in the range of about 90 to about 99 percent or 
 (B) a crystalline propylene copolymer with ethylene, a CH 2 ═CHR olefin where R is a 2-8 carbon alkyl radical, or combinations thereof, containing from about 85 to about 99 weight percent of propylene, based on the weight of the crystalline propylene copolymer, and having an isotactic index in the range of about 85 to about 99 percent, 
 
 (ii) from about 8 to about 40 weight percent, based on the total weight of the olefin polymer composition, of a semicrystalline, ethylene copolymer fraction containing ethylene and propylene, having from about 50 to about 99 weight percent of ethylene, based upon of the total weight of the semicrystalline, ethylene copolymer, and being insoluble in xylene at room temperature, and 
 (iii) from about 30 to about 60 weight percent, based on the total weight of the olefin polymer composition, of an amorphous ethylene-propylene copolymer fraction which
 (A) optionally, contains from about 1 to about 10 weight percent of a diene, based on the total weight of the amorphous ethylene-propylene copolymer fraction, 
 (B) is soluble in xylene at room temperature, and 
 (C) contains about 40 to about 70 weight percent of ethylene, based on the total weight of the amorphous ethylene-propylene copolymer fraction, and 
 
 
 (b) an olefin polymer composition consisting essentially of
 (i) from about 10 to about 50 weight percent, based on the total weight of the olefin polymer composition, of
 (A) a propylene homopolymer having an isotactic index greater from about 80 to about 99 percent, or 
 (B) a copolymer selected from the group consisting of
 (1) propylene and ethylene, 
 (2) propylene, ethylene, and a CH 2 ═CHR alpha-olefin where R is a C 2-8  straight or branched alkyl, and 
 (3) propylene and a CH 2 ═CHR alpha-olefin where R is a C 2-8  straight or branched alkyl, 
 
 wherein the copolymer contains from about 80 to about 99 weight percent, based on the total weight of the copolymer, of propylene, and has an isotactic index from about 80 to about 99 percent, 
 
 (ii) from 0 to about 20 weight percent, based on the total weight of the olefin polymer composition, of a copolymer fraction containing ethylene insoluble in xylene at room temperature, and 
 (iii) from about 40 to about 80 weight percent, based on the total weight of the olefin polymer composition, of a copolymer fraction selected from the group consisting of a copolymer of
 (A) ethylene and propylene, wherein the copolymer contains from about 20 to about 40 weight percent, based upon the total weight of the copolymer, of ethylene, 
 (B) ethylene, propylene, and a CH 2 ═CHR alpha-olefin where R is a C 2-8  straight or branched alkyl, the alpha-olefin is present in an amount from about 1 to about 10 weight percent, based upon the total weight of the copolymer, and the total weight of the ethylene and alpha-olefin together is from about 20 to about 40 weight percent, based upon the total weight of the copolymer, and 
 (C) ethylene and a CH 2 ═CHR alpha-olefin where R is a C 2-8  straight or branched alkyl containing from about 20 to about 40 weight percent of the alpha-olefin, based on the total weight of the copolymer, which
 (1) optionally, contains from about 0.5 to about 10 weight percent, based on the total weight of the copolymer, of a diene, 
 (2) is soluble in xylene at room temperature, and 
 (3) has an intrinsic viscosity of from about 1.5 to about 10.0 dl/g, 
 
 
 
 wherein the total of the (bii) and (biii) fractions is from about 50 to about 90 weight percent, based on the total olefin polymer composition and the weight ratio of (bii)/(biii) being from about 0.1 to about 0.4. 
 
     
     
         7 . An adhesive comprising a polyolefin-based composition comprising:
 (a) from about 1 to about 30 weight percent of a grafted polyolefin composition, relative to the total weight of the polyolefin-based composition, comprising a polyolefin grafted with an unsaturated monomer;   (b) from about 10 to about 80 weight percent of a first polymer composition, relative to the total weight of the polyolefin-based composition, comprising a first polyolefin polymer;   (c) from about 10 to about 40 weight percent of a polypropylene-containing blend composition, relative to the total weight of the polyolefin-based composition, comprising a polypropylene-containing blend; and   (d) optionally, an additives composition having one or more additives.   
     
     
         8 . A multi-layered structure comprising a tie-layer adhesive comprising a polyolefin-based composition comprising:
 (a) from about 1 to about 30 weight percent of a grafted polyolefin composition, relative to the total weight of the polyolefin-based composition, comprising a polyolefin grafted with an unsaturated monomer;   (b) from about 10 to about 80 weight percent of a first polymer composition, relative to the total weight of the polyolefin-based composition, comprising a first polyolefin polymer;   (c) from about 10 to about 40 weight percent of a polypropylene-containing blend composition, relative to the total weight of the polyolefin-based composition, comprising a polypropylene-containing blend; and   (d) optionally, an additives composition having one or more additives.