Crosslinked compositions, method of making them, and articles comprising them
AssigneeExxonMobil Chemical Patents Inc.
InventorSunny Jacob
Life of this patent
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Abstract
The present invention relates to a composition comprising at least one propylene-based polymer comprising less than 0.1 wt. % diene-derived units based on the weight of the propylene-based polymer, an antioxidant, and a co-agent. The composition can be at least partially crosslinked by electron beam irradiation in a dose of less than 200 kGy, and may be further formed into articles including fibers, yarns, films, and nonwovens, among others. The propylene-based polymer of the present invention may be a polymer blend formed by forming a reactor blend from of two or more polymers produced in two or more reactors.
Claims24
A method for making a crosslinked composition comprising the step of crosslinking the composition using electron beam radiation having an electron beam dose of about 200 kGy or less, the composition comprising:
- i) one or more propylene-based polymers each comprising from about 75 wt. % to about 99 wt. % propylene-derived units, and from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units;
- wherein at least one of the one or more propylene-based polymers is a polymer blend formed by forming a reactor blend of a first polymer formed in a first reactor and a second polymer formed in a second reactor, the first polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.1 wt. % diene-derived units, based on the weight of the first polymer;
- and the second polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.1 wt. % diene-derived units, based on the weight of the second polymer;
- ii) at least one of a multifunctional acrylate, multifunctional methacrylate, functionalized polybutadiene resin, functionalized cyanurate, and allyl isocyanurate;
- and
- iii) at least one of a hindered phenol, phosphite, and hindered amine;
- wherein each propylene-based polymer in the composition comprises less than 0.1 wt. % diene derived units, based on the weight of that propylene-based polymer.
A composition comprising:
- i) a polymer blend formed by forming a reactor blend of a first polymer formed in a first reactor and a second polymer differing in olefin content from the first polymer and formed in a second reactor, the first polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.05 wt. % diene-derived units based on the weight of the first polymer;
- and the second polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.05 wt. % diene-derived units based on the weight of the second polymer;
- ii) at least one of a multifunctional acrylate, multifunctional methacrylate, functionalized polybutadiene resin, functionalized cyanurate, and allyl isocyanurate;
- and
- iii) at least one of a hindered phenol, phosphite, and hindered amine.
A crosslinked composition, comprising:
- i) one or more propylene-based polymers each comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units;
- wherein at least one of the one or more propylene-based polymers is a polymer blend formed by forming a reactor blend of a first polymer formed in a first reactor and a second polymer formed in a second reactor, the first polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.1 wt. % diene-derived units, based on the weight of the first polymer;
- and the second polymer comprising from about 75 wt. % to about 99 wt. % propylene-derived units, from about 1 wt. % to about 25 wt. % ethylene and/or C4-C20 α-olefin-derived units, and less than 0.1 wt. % diene-derived units, based on the weight of the second polymer;
- ii) at least one of a multifunctional acrylate, multifunctional methacrylate, functionalized polybutadiene resin, functionalized cyanurate, and allyl isocyanurate;
- iii) at least one of a hindered phenol, phosphite, and hindered amine;
- and
- iv) a polyolefinic thermoplastic resin,
- wherein the crosslinked composition has greater than 40% xylene insolubles as measured according to ASTM-D 5492;
- and
- wherein each propylene-based polymer in the composition comprises less than 0.1 wt. % diene derived units, based on the weight of that propylene-based polymer.
Dependencies are inferred from the claim text.