Adhesives comprising olefin polymers
First Claim
Patent Images
1. A pressure sensitive adhesive comprising:
- (a) from 5 to 95 weight percent of at least one interpolymer, which is a homogeneous ethylene/α
-olefin interpolymer, characterized as having a density from 0.850 to 0.885 g/cm3 and a weight average molecular weight (Mw) of less than 20,000;
(b) from 0 to 95 weight percent of at least one tackifier;
(c) from 0 to about 90 weight percent of at least one plasticizer; and
(d) from 0 to 90 weight percent of at least one wax;
wherein the sum of components (b), (c), and (d) comprises 5 to 95 weight percent of said adhesive composition, wherein said adhesive is characterized as having a storage modulus (G′
), at 25°
C., of less than 1×
107 dynes/cm2 (1 MPa), and a glass transition temperature (Tg) from −
65°
C. to 30°
C., andwherein the α
-olefin is randomly distributed within the ethylene/α
-olefin interpolymer.
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Accused Products
Abstract
Disclosed are adhesives and processes for preparing the same, comprising at least one first homogeneous ethylene/α-olefin interpolymer, and optionally at least one tackifier, and optionally at least one plasticizer. The claimed adhesives are useful as adhesives such as are employed in various applications, such as in masking tape, clear office tape, labels, decals, bandages, decorative and protective sheets (such as shelf and drawer liners), floor tiles, sanitary napkin/incontinence device placement strips, sun control films, the joining of gaskets to automobile windows, packaging, bookbinding, construction of nonwoven articles, and insulation bonding.
119 Citations
25 Claims
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1. A pressure sensitive adhesive comprising:
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(a) from 5 to 95 weight percent of at least one interpolymer, which is a homogeneous ethylene/α
-olefin interpolymer, characterized as having a density from 0.850 to 0.885 g/cm3 and a weight average molecular weight (Mw) of less than 20,000;(b) from 0 to 95 weight percent of at least one tackifier; (c) from 0 to about 90 weight percent of at least one plasticizer; and (d) from 0 to 90 weight percent of at least one wax; wherein the sum of components (b), (c), and (d) comprises 5 to 95 weight percent of said adhesive composition, wherein said adhesive is characterized as having a storage modulus (G′
), at 25°
C., of less than 1×
107 dynes/cm2 (1 MPa), and a glass transition temperature (Tg) from −
65°
C. to 30°
C., andwherein the α
-olefin is randomly distributed within the ethylene/α
-olefin interpolymer.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
wherein the at least one tackifier is provided in an amount from 0 to 70 weight percent.
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8. The adhesive of claim 1, wherein the adhesive further comprises a modifying or extending composition, selected from the group consisting of wax, styrenic block copolymers, polyamides, interpolymers or ionomers of ethylene and mixtures thereof.
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9. The adhesive of claim 8, wherein the modifying or extending composition is selected from the group consisting of ethylene/acrylic acid, ethylene/methyl acrylate, ethylene/isobutyl acrylate, ethylene/n-butyl acrylate, ethylene/methyl methacrylate copolymers and mixtures thereof.
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10. The adhesive of claim 1, further comprising a polyethylene having molecular weight of greater than 3,000.
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11. The adhesive of claim 10, wherein the amount of the polyethylene ranges from about 20 to about 60 weight percent.
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12. The adhesive of claim 1, wherein the homogeneous ethylene/α
- -olefin interpolymer is an interpolymer of ethylene, having greater than 30 weight percent, as determined by mass balance, of an α
-olefin comonomer having from 3 to 20 carbon atoms.
- -olefin interpolymer is an interpolymer of ethylene, having greater than 30 weight percent, as determined by mass balance, of an α
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15. The adhesive of claim 1, wherein the ethylene/α
- -olefin interpolymer is a copolymer of ethylene and one α
-olefin.
- -olefin interpolymer is a copolymer of ethylene and one α
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16. The adhesive of claim 1, wherein the ethylene/α
- -olefin interpolymer comprises 9.1 to 12.5 mole percent of the α
-olefin.
- -olefin interpolymer comprises 9.1 to 12.5 mole percent of the α
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17. The adhesive of claim 1, wherein the adhesive comprises 10 to 75 weight percent of at least one tackifier.
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18. The adhesive of claim 1, wherein the adhesive comprises 10 to 50 weight percent of at least one plasticizer (solid).
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19. The adhesive of claim 17, wherein the adhesive comprises 10 to 50 weight percent of at least one plasticizer (solid).
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20. The adhesive of claim 1, wherein the composition further comprises at least one additive selected from the group consisting of antioxidants, antiblock additives, pigments and fillers.
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21. The adhesive of claim 1, wherein the composition further comprises at least one antioxidant.
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22. The adhesive of claim 17, wherein the composition further comprises at least one additive selected from the group consisting of antioxidants, antiblock additives, pigments and fillers.
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23. The adhesive of claim 17, wherein the composition further comprises at least one antioxidant.
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24. The adhesive of claim 18, wherein the composition further comprises at least one additive selected from the group consisting of antioxidants, antiblock additives, pigments and fillers.
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25. The adhesive of claim 19, wherein the composition further comprises at least one additive selected from the group consisting of antioxidants, antiblock additives, pigments and fillers.
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13. A pressure sensitive adhesive consisting essentially of:
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(a) from 5 to 95 weight percent of a least one homogeneous ethylene/α
-olefin interpolymer having a density from 0.850 to 0.885 g/cm3 and a weight average molecular weight (Mw) of less than 20,000;(b) from 0 to 95 weight percent of at least one tackifier; (c) from 0 to 95 weight percent of at least one plasticizer; (d) from 0 to 95 percent of at least one wax; (e) at least one antioxidant; and wherein the sum of component (b), (c), and (d) comprises 5 to 95 percent of the adhesive composition, and wherein said adhesive is characterized as having a storage modulus (G′
), at 25°
C., of less than 1×
107 dynes/cm2 (1 MPa), and a glass transition temperature (Tg) from −
65°
C. to 30°
C., andwherein the α
-olefin is randomly distributed within the ethylene/α
-olefin interpolymer.
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14. A pressure sensitive adhesive consisting essentially of:
-
(a) from 5 to 95 weight percent of at least one interpolymer, which is a homogeneous ethylene/α
-olefin interpolymer, characterized as having a density from 0.850 to 0.885 g/cm3 and a weight average molecular weight (Mw) of less than 20,000;(b) from 0 to 95 weight percent of at least one tackifier; (c) from 0 to about 90 weight percent of at least one plasticizer; and (d) from 0 to 90 weight percent of at least one wax; and wherein the sum of components (b), (c), and (d) comprises 5 to 95 weight percent of said adhesive composition, and wherein said adhesive is characterized as having a storage modulus (G′
), at 25°
C., of less than 1×
107 dynes/cm2 (1 MPa) and a glass transition temperature (Tg) from −
65°
C. to 30°
C., andwherein the α
-olefin is randomly distributed within the ethylene/α
-olefin interpolymer.
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Specification