Adherent, modified thermoplastic elastomeric blends, articles, and methods
AssigneeSolvay Engineered Polymers
InventorsKevin Cai, Anthony Nguyen, Charles Reid
Life of this patent
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Abstract
A thermoplastic elastomer that is adherent to polar materials may be made from a dynamically vulcanized blend of propylene resin, ethylene/alpha-olefin/non-conjugated diene elastomers, and a bonding agent via a curing system containing a free radical initiator, at least one co-agent including multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures of both, where the elastomer gel content in the modified blend is at least about 97 percent. Reaction mixtures, articles made therefrom, and methods of dynamically vulcanizing are also disclosed.
Claims22
An adherent, reactively modified thermoplastic elastomeric blend formed from the dynamic vulcanization of a material comprising a propylene resin, an ethylene/alpha-olefin/non-conjugated diene copolymeric elastomer component, and a bonding agent, in the presence of a curing system comprising:
- a free radical initiator;
- and
- a co-agent comprising one or more multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures thereof;
- wherein the free radical initiator and the co-agent are collectively present in an amount sufficient to provide a gel content of the elastomeric blend of at least about 97 percent and to provide blends of the invention that are adherent with a minimum peel strength of at least about 650 g/cm to a polar material.
A process for preparing a dynamically vulcanized thermoplastic elastomer composition which comprises:
- blending a mixture of a polypropylene resin, an ethylene/alpha-olefin/non-conjugated diene elastomer component, and a bonding agent at a temperature above the melting point of the polypropylene resin;
- adding a free radical initiator and a co-agent comprising multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures thereof, to form a blend;
- and
- then mixing and shearing the blend sufficiently at a temperature to effect crosslink formation wherein the elastomer has a gel content of at least about 97 percent and to provide the dynamically vulcanized thermoplastic elastomer composition that is adherent to polar materials.
A thermoplastic elastomer curing system comprising:
- a free radical initiator comprising at least one organic peroxide;
- a co-agent comprising multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures thereof;
- wherein the curing system includes sufficient amounts of the free radical initiator and the co-agent, when combined with a polypropylene resin, an ethylene-containing material and a bonding agent, to form a reactively modified thermoplastic elastomer blend having a gel content of the modified elastomer of at least about 97 percent and to provide blends adherent to polar materials.
A vulcanizable mixture comprising a propylene resin, an ethylene/alpha-olefin/non-conjugated diene copolymeric elastomer component, a bonding agent, and a curing system comprising:
- a free radical initiator and a co-agent comprising one or more multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures thereof.
Dependencies are inferred from the claim text.