Adhesive compositions comprising ethylene/polar monomer copolymer and an elastomer
First Claim
1. An adhesive composition comprising(a) a normally adhesive copolymer of ethylene and at least one monoolefinically unsaturated polar comonomer, said copolymer containing at least about 50% by weight of combined ethylene, and(b) an ethylene-propylene elastomer which(i) has a substantially or fully saturated backbone;
- (ii) has a Mooney viscosity at 250°
F. of less than about 70;
(iii) contains less than about 55% by weight of combined ethylene; and
(iv) is present in amount 15 to 50 parts by weight per 100 parts by weight of the elastomer and the normally adhesive copolymer together.
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Abstract
Compositions comprising a mixture of an adhesive copolymer of ethylene and a monoolefinically unsaturated polar comonomer, for example, vinyl acetate, in combination with an olefin rubber, preferably a rubbery copolymer of ethylene and propylene, exhibit excellent adhesive properties, particularly when applied to non-porous surfaces such as metals. Creep resistance can be improved by lightly crosslinking the composition with radiation. Typically thermoplastic in nature, these compositions can be made thermosetting by including in the composition a heat activated crosslinking system. The compositions also exhibit resistance to blocking and flexibility at low temperatures.
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Citations
27 Claims
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1. An adhesive composition comprising
(a) a normally adhesive copolymer of ethylene and at least one monoolefinically unsaturated polar comonomer, said copolymer containing at least about 50% by weight of combined ethylene, and (b) an ethylene-propylene elastomer which (i) has a substantially or fully saturated backbone; -
(ii) has a Mooney viscosity at 250°
F. of less than about 70;(iii) contains less than about 55% by weight of combined ethylene; and (iv) is present in amount 15 to 50 parts by weight per 100 parts by weight of the elastomer and the normally adhesive copolymer together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An adhesive composition comprising
(a) a normally adhesive copolymer which (i) contains 50 to 85% by weight of units derived from ethylene, with the balance of the copolymer being units derived from at least one monoolefinically unsaturated polar comonomer, and (ii) has a melt index at 190° - C. and 2160 gms of 4 to 500; and
(b) an ethylene-propylene elastomer which (i) has a substantially or fully saturated backbone; (ii) has a Mooney viscosity at 250°
F. of about 45 or less;(iii) contains 40 to 55% by weight of units derived from ethylene and 2 to 10% by weight of units derived from a non-conjugated diene, with the balance of the elastomer being units derived from propylene; and (iv) is present in amount 15 to 50 parts by weight per 100 parts by weight of the copolymer (a) and the elastomer (b) together. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
- C. and 2160 gms of 4 to 500; and
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25. An adhesive composition wherein the polymeric constituents consist essentially of
(a) a normally adhesive copolymer of ethylene and at least one monoolefinically unsaturated polar comonomer, said copolymer containing at least about 50% by weight of combined ethylene; (b) a polyolefin elastomer which (i) has a substantially or fully saturated backbone, (ii) has a Mooney viscosity at 250°
F. of less than about 70, and(iii) is present in amount 15 to 50 parts by weight per 100 parts by weight of the elastomer and the normally adhesive copolymer together; and
optionally(c) a tackifier. - View Dependent Claims (26, 27)
Specification
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- Resources
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Current AssigneeRaychem Corporation (TE Connectivity Limited)
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Original AssigneeRaychem Corporation (TE Connectivity Limited)
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InventorsBerejka, Anthony J.
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Primary Examiner(s)SECCURO JR, CARMAN J
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Application NumberUS06/152,433Time in Patent Office740 DaysField of Search525/211, 525/221, 525/222, 525/227, 204/159.2US Class Current525/211CPC Class CodesC08L 2666/04 Macromolecular compounds ac...C09J 123/08 Copolymers of ethene C09J12...
