Patent ID: 6166132
Filing Date: 2000-12-26
Classification: C08L

Abstract:
A composition comprising, wherein all parts and percentages are by weight,(1) 100 parts of a thermoplastic olefin comprising:(a) about 10% to about 60% of a propylene homopolymer having an isotactic index, defined as the percent insoluble in xylene at room temperature, greater than 90, or a crystalline propylene copolymer with ethylene and/or a C.sub.4-8 alpha-olefin having a polymerized propylene content greater than 85% and an isotactic index, defined as the percent insoluble in xylene at room temperature, of greater than 85%;(b) about 30% to about 60% of an amorphous ethylene-propylene or ethylene-butene copolymer, optionally containing about 1% to about 10% of a polymerized diene, which is xylene soluble at room temperature and contains about 30% to about 70% polymerized ethylene;(c) about 2% to about 20% of a semi-crystalline ethylene-propylene or ethylene-butene copolymer that is xylene insoluble at room temperature and contains greater than 75% but less than 92% polymerized ethylene; and(d) about 5% to about 20% of an ethylene polymer having a density of 0.91 to 0.96 g/cm.sup.3 and a melt index of 0.1 to about 100 g/10 min, the ethylene polymer being selected from the group consisting of (i) an ethylene homopolymer and (ii) a copolymer of ethylene and an alph-olefin containing 8% or less of polymerized alpha-olefin;(2) about 8 parts to about 14 parts per hundred parts of the thermoplastic olefin of a maleic anhydride-grafted propylene homopolymer or ethylene/propylene random copolymer having a polymerized ethylene content of about 0.5% to about 4%, the homopolymer and copolymer having a maleic anhydride content of about 2 to about 5% and a number average molecular weight M.sub.n of about 2500 to about 25,000;(3) about 5 parts to about 14 parts per hundred parts of the thermoplastic olefin of a maleic anhydride-grafted olefin polymer material having a maleic anhydride content of at least 0.3% but less than 3%, selected from the group consisting of:(a) a maleic anhydride-grafted polyolefin rubber comprising an ethylene/propylene or ethylene/butene copolymer rubber, optionally containing about 0.5% to about 10% polymerized ethylene, and(b) a maleic anhydride-grafted propylene polymer material, wherein the propylene polymer material consists essentially of:(i) about 10% to about 50% of a propylene homopolymer having an isotactic index, defined as the percent insoluble in xylene at room temperature, of about 80% to about 90%, or a copolymer from monomers selected from the group consisting of (a) propylene and ethylene, (b) propylenem, ethylene and a CH.sub.2 .dbd.CHR alpha-olefin, where R is a C.sub.2-8 straight or branched alkyl group, and (c) propylene and an alpha-olefin as defined above in (i)(b), the copolymer containing about 85% to about 99% polymerized propylene and having an isotactic index, defined as the percent insoluble in xylene at room temperature, of about 80% to about 98%;(ii) about 3% to about 20% of a semi-crystalline, essentially linear copolymer having a crystallinity of about 20% to about 60% by differential scanning calorimetry, wherein the copolymer is from monomers selected from the group consisting of (a) ethylene and propylene containing over 50% polymerized ethylene; (b) ethylene, propylene, and an alpha-olefin as defined above in (i)(b), containing about 1% to about 10% of the polymerized alpha-olefin and over 50% up to 98% of both polymerized ethylene and polymerized alpha-olefin; and (c) ethylene and an alpha-olefin as defined in (i)(b), containing over 50% up to 98% of the polymerized alpha-olefin, which copolymer is insoluble in xylene at room or ambient temperature; and(iii) about 40% to about 80% of a copolymer from monomers selected from the group consisting of (a) ethylene and propylene, wherein the copolymer contains from 20% to less than 40% polymerized ethylene; (b) ethylene, propylene, and an alpha-olefin as defined in (i)(b), wherein the polymerized alpha-olefin is present in an amount of about 1% to about 10%, and the amount of polymerized ethylene and polymerized alpha-olefin present is from 20% to less than 45%; and (c) ethylene and an alpha-olefin as defined in (i)(b), containing from 20% to less than 45% of the polymerized alpha-olefin, and optionally containing about 0.5% to about 10% of a polymerized diene, the copolymer (iii) being soluble in xylene at ambient temperature, and having an intrinsic viscosity of about 1.7 to about 3.0 dl/g, wherein the total amount of (ii) and (iii), based on the total olefin polymer composition is about 65% to about 80%, the weight ratio of (ii)/(iii) is about 0.1 to about 0.3, and the total content of polymerized ethylene or polymerized C.sub.4-8 alpha-olefin or combination thereof in (ii)+(iii) is less than 50%; and(4) a functionalized polymer that is reactive with the anhydride groups of the grafted polymers, selected from the group consisting of:(a) about 2.7 to about 6 parts of an amine-terminated polyalkylene glycol per hundred parts of thermoplastic olefin;(b) about 2 to about 6 parts per hundred parts of the thermoplastic olefin of a hydroxylated polymer selected from the group consisting of:(i) hydroxylated polyethylene,(ii) hydroxylated polybutene, and(iii) hydroxylated polybutadiene; and(c) about 2 to about 6 parts per hundred parts of the thermoplastic olefin of a mixture of (a)+(b), where the ratio of (a) to (b) is about 0.1 to about 0.9,wherein (2)+(3) is at least 16 parts but less than 27 parts per hundred parts of the thermoplastic olefin; and(5) about 4 parts to about 15 parts per hundred parts of the thermoplastic olefin, of a maleic anhydride-grafted ethylene polymer having a maleic anhydride content of about 2% to about 13% and a molecular weight M.sub.n of about 500 to about 3000, wherein (2)+(3)+(5) is at least 16 parts but less than 27 parts per hundred parts of the thermoplastic olefin, and (3)+(5) is equal to or greater than 10 parts per hundred parts of the thermoplastic olefin.