Adhesive and marking compositions made from interpolymers of ethylene/α-olefins
First Claim
Patent Images
1. A composition comprising:
- (i) at least one ethylene/α
-olefin interpolymer, wherein the ethylene/α
-olefin interpolymer;
(a) has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship;
Tm>
−
2002.9+4538.5(d)−
2422.2(d)2, or(b) has a Mw/Mn from about 1.7 to about 3.5, and is characterized by a heat of fusion, Δ
H in J/g, and a delta quantity, Δ
T, in degrees Celsius, defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of Δ
T and Δ
H have the following relationships;
Δ
T>
−
0.1299(Δ
H)+62.81 for Δ
H greater than zero and up to 130 J/g,
Δ
T≧
48°
C. for Δ
H greater than 130 J/g,
wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30°
C.;
or(c) is characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α
-olefin interpolymer, and has a density, d, in grams/cubic centimeter, wherein the numerical values of Re and d satisfy the following relationship when ethylene/α
-olefin interpolymer is substantially free of a cross-linked phase;
Re>
1481-1629(d);
or(d) has a molecular fraction which elutes between 40°
C. and 130°
C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index, density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the ethylene/α
-olefin interpolymer;
or(e) has a storage modulus at 25°
C., G′
(25°
C.), and a storage modulus at 100°
C., G′
(100°
C.), wherein the ratio of G′
(25°
C.) to G′
(100°
C.) is in the range of about 1;
1 to about 9;
1; and
(ii) at least one tackifier.
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Abstract
An adhesive composition comprises: (i) at least one ethylene/α-olefin interpolymer, (ii) at least one tackifier; and (iii) optionally at least one additive, such as a plasticizer, wax and antioxidant. Preferably, the ethylene/α-olefin interpolymer has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship: Tm≧858.91−1825.3(d)+1112.8(d)2. The composition has relatively higher SAFT temperature and can be used in hot melt adhesives pressure-sensitive adhesives, and thermoplastic marking paints.
-
Citations
47 Claims
-
1. A composition comprising:
-
(i) at least one ethylene/α
-olefin interpolymer, wherein the ethylene/α
-olefin interpolymer;(a) has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship;
Tm>
−
2002.9+4538.5(d)−
2422.2(d)2, or(b) has a Mw/Mn from about 1.7 to about 3.5, and is characterized by a heat of fusion, Δ
H in J/g, and a delta quantity, Δ
T, in degrees Celsius, defined as the temperature difference between the tallest DSC peak and the tallest CRYSTAF peak, wherein the numerical values of Δ
T and Δ
H have the following relationships;
Δ
T>
−
0.1299(Δ
H)+62.81 for Δ
H greater than zero and up to 130 J/g,
Δ
T≧
48°
C. for Δ
H greater than 130 J/g,
wherein the CRYSTAF peak is determined using at least 5 percent of the cumulative polymer, and if less than 5 percent of the polymer has an identifiable CRYSTAF peak, then the CRYSTAF temperature is 30°
C.;
or(c) is characterized by an elastic recovery, Re, in percent at 300 percent strain and 1 cycle measured with a compression-molded film of the ethylene/α
-olefin interpolymer, and has a density, d, in grams/cubic centimeter, wherein the numerical values of Re and d satisfy the following relationship when ethylene/α
-olefin interpolymer is substantially free of a cross-linked phase;
Re>
1481-1629(d);
or(d) has a molecular fraction which elutes between 40°
C. and 130°
C. when fractionated using TREF, characterized in that the fraction has a molar comonomer content of at least 5 percent higher than that of a comparable random ethylene interpolymer fraction eluting between the same temperatures, wherein said comparable random ethylene interpolymer has the same comonomer(s) and has a melt index, density, and molar comonomer content (based on the whole polymer) within 10 percent of that of the ethylene/α
-olefin interpolymer;
or(e) has a storage modulus at 25°
C., G′
(25°
C.), and a storage modulus at 100°
C., G′
(100°
C.), wherein the ratio of G′
(25°
C.) to G′
(100°
C.) is in the range of about 1;
1 to about 9;
1; and(ii) at least one tackifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 44, 45)
-
-
25. A composition comprising:
-
(i) at least one ethylene/α
-olefin interpolymer, wherein the ethylene/α
-olefin interpolymer has;(a) a molecular fraction which elutes between 40°
C. and 130°
C. when fractionated using TREF, characterized in that the fraction has a block index of at least 0.5 and up to about 1;
or(b) an average block index greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than about 1.3; and (ii) at least one tackifier. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 46, 47)
-
Specification