Patent ID: 12215214

EXAMPLES

Twenty-five example compositions were prepared, and polymer characteristics of each were measured. Each of the example compositions was a blend of a LDPE homopolymer and an acid copolymer. The properties of the LDPE homopolymers are listed in Table 1.

TABLE 1Polymer Properties of the LDPE homopolymerMelt IndexMWDDensityProduct(dg/min)(Mw/Mn)(g/cm3)AGILITY EC 70302.58.970.918AGILITY EC 70003.98.820.919LDPE 50055.79.290.922LDPE PG 70087.58.830.918LDPE 62112.311.000.918LDPE 7228.010.810.918LDPE 40101011.890.917LDPE 4016169.540.919

Example 1 was a polymer blend prepared from 95% by weight AGILITY™ EC 7030 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, 6% by weight iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min. Example 2 was a polymer blend prepared from 95% by weight AGILITY™ EC 7030 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, 10% by weight iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 3 was a polymer blend prepared from 95% by weight AGILITY™ EC 7030 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 4 was a polymer blend prepared from 95% by weight AGILITY™ EC 7000 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 5 was a polymer blend prepared from 95% by weight AGILITY™ EC 7000 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 6 was a polymer blend prepared from 95% by weight LDPE 5005 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 7 was a polymer blend prepared from 95% by weight LDPE PG 7008 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 8 was a polymer blend prepared from 95% by weight LDPE 4016 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 9 was a polymer blend prepared from 95% by weight LDPE 6211 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 10 was a polymer blend prepared from 95% by weight LDPE 722 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 11 was a polymer blend prepared from 95% by weight LDPE 4010 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 2% by weight methacrylic acid, and 6% of iso-butyl acrylate, and 92% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 12 was a polymer blend prepared from 95% by weight LDPE 6211 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 13 was a polymer blend prepared from 95% by weight LDPE 5005 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 14 was a polymer blend prepared from 95% by weight LDPE 722 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 15 was a polymer blend prepared from 95% by weight LDPE PG 7008 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 16 was a polymer blend prepared from 95% by weight LDPE 4010 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 17 was a polymer blend prepared from 95% by weight LDPE 4016 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 9% by weight methacrylic acid, and 91% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 18 was a polymer blend prepared from 95% by weight LDPE 6211 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 19 was a polymer blend prepared from 95% by weight LDPE 5005 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 20 was a polymer blend prepared from 95% by weight LDPE 722 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 21 was a polymer blend prepared from 95% by weight LDPE PG 7008 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 22 was a polymer blend prepared from 95% by weight LDPE 4010 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 23 was a polymer blend prepared from 95% by weight LDPE 4016 manufactured by Dow, Inc. as the LDPE component and 5% by weight acid copolymer. The acid copolymer included 10% by weight methacrylic acid, and 10% of iso-butyl acrylate, and 80% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 10 dg/min.

Example 24 was a polymer blend prepared from 97% by weight AGILITY™ EC 7030 manufactured by Dow, Inc. as the LDPE component and 3% by weight acid copolymer. The acid copolymer included 4% by weight methacrylic acid, and 15% of iso-butyl acrylate, and 81% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 27 dg/min (g/10 mins).

Example 25 was a polymer blend prepared from 97% by weight AGILITY™ EC 7000 manufactured by Dow, Inc. as the LDPE component and 3% by weight acid copolymer. The acid copolymer included 4% by weight methacrylic acid, and 15% of iso-butyl acrylate, and 81% by weight ethylene based on the total weight of the monomers of the acid copolymer and had a melt index of 27 dg/min (g/10 mins).

Characteristics of each of the polymer blends and comparative polymers are summarized in Table 2.

TABLE 2Polymer Blend Peel StrengthAverage peel strengthPeel strengthPeel Strengthmean (N/in)improvedimprovedRunAbsolute*(N/in)**(%)***LDPE HomopolymersAgility EC 70301.56——Agility EC 70000.62——LDPE 50050.20——LDPE 7220.11——LDPE PG 70080.12——LDPE 40100.06LDPE 40160.07ExamplesExample 12.100.635Example 22.490.960Example 32.561.065Example 41.721.1175Example 52.962.3375Example 61.020.8418Example 70.800.7591Example 80.750.71012Example 9Not processable****Example 100.550.4401Example 110.160.1163Example 12Not processable****Example 130.250.0527Example 140.200.187Example 150.470.4302Example 160.140.07119Example 170.410.3510Example 18Not processable****Example 190.320.1224Example 200.170.0653Example 210.320.21178Example 220.120.06100Example 230.290.22334Example 242.35NA****NAExample 252.962.3375*Peel bond strength is reported in average peel strength from 1 inch of extension to 4 inches of extension or until the sample fails if less than 4 inches; and the bonded substrate was an aluminum foil laminate.**The Peel strength improved is the calculated by the difference between the peel strength of the pure LDPE and the peel strength of the LDPE and acid copolymer.***The Peel strength improved (%) was calculated by the following formula:(adhesion⁢strength⁢of⁢LDPE+ACR)-(adhesion⁢strength⁢of⁢pure⁢LDPE)peel⁢strength⁢of⁢pure⁢LDPE*100****The blend cannot be run in an extrusion coating line with line speed of greater than 440 ft/min (134 meters per minute).

The addition of 5% by weight of an acid copolymer to a LDPE polymer resulted in a polymer blend having a greater peel strength than the LDPE polymer.