摘要:
A closed cell foam material contains a propylene based polymer comprising from about 5% to about 32% by weight α-olefin units. The propylene based polymer has a heat of fusion, as determined by DSC, of less than 80 J/g. The material also contains 0.5 to 5 phr peroxide, 1.0 to 5.0 phr blowing agent, and 0.1 to 10 phr co-agent. The cells of closed cell foam material have a diameter in the range of 0.1 to 1.5 mm.
摘要:
A heterogeneous polymer blend comprises a continuous phase comprising a thermoplastic first polymer having a crystallinity of at least 30% and a dispersed phase comprising particles of a second polymer different from the first polymer dispersed in said continuous phase, the second polymer having a crystallinity of less than 20% and being at least partially cross-linked, and the average particle size of the particles of the second polymer being less than 1 micron.
摘要:
A polymeric laminate comprising (A) a substrate, and (B) a slip layer covering at least a portion of said substrate, where the slip layer consists essentially of (i) a polyethylene blend, where said blend includes (a) from about 3 to about 97 percent by weight, based upon the total weight of said blend, of a first polyethylene resin having a weight average molecular weight from 110,000 to about 140,000 and a polydispersity of less than about 12, (b) from about 3 to about 97 percent by weight, based upon the total weight of said blend, of a second polyethylene resin having a weight average molecular weight from 50,000 up to 109,999 and a polydispersity of less than about 12, and (c) from about 0 to about 40 percent by weight, based upon the total weight of said blend, of a third polyethylene resin having a weight average molecular weight from about 20,000 up to 49,999 and polydispersity of less than about 12, with the proviso that said blend includes at least 60 percent, based upon the total weight of said blend, of said first polyethylene and said second polyethylene combined, (ii) from about 2.5 to about 15 parts by weight, per 100 parts by weight of said polyethylene blend, of a propylene polymer or copolymer having propylene units deriving from propylene monomer, and (iii) from about 4.5 to about 20 parts by weight, per 100 parts by weight of said polyethylene blend, of a dynamically vulcanized rubber.
摘要:
A thermoplastic vulcanizate prepared by dynamically vulcanizing a halogenated butyl rubber within a mixture that includes the halogenated butyl rubber and from about 10 to about 100 parts by weight of a crystalline thermoplastic resin per 100 parts by weight rubber, to thereby form a thermoplastic vulcanizate, where the thermoplastic resin includes a resin other than polyethylene, melt mixing the thermoplastic vulcanizate with about 5 to about 75 parts by weight of polyethylene resin per 100 parts by weight rubber, from about 3 to about 60 parts by weight of a tackifier per 100 parts by weight rubber, and from about 5 to about 250 parts by weight of a block copolymer containing at least the structure S-B/S-S per 100 parts by weight rubber, where the S block of the block copolymer has a glass transition temperature above about 25° C., the B/S block has a glass transition temperature below about 25° C., and the S content of the B/S block is from about 40 to about 60 percent by weight of said S/B block, the diene content of the total block copolymer is less than 40 weight percent, and the B/S block amount to at least 50 weight percent of the total block copolymer.
摘要:
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.
摘要:
Ethylene-vinyl alcohol (EVOH) based thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV) including a cured rubber dispersed therein and an EVOH-rubber compatibilizer.
摘要:
Crosslinked polyolefin blends, methods for their production, and articles made of the same are provided. In at least one specific embodiment, the polyolefin blends comprise a first polymer formed in a first reactor and a second polymer formed in a second reactor. The first and second polymers, as well as the resulting blend, may comprise units derived from propylene, ethylene, and a diene. The blended composition can then be compounded with one or more coagents, antioxidants, UV sensitizers, and/or other additives and crosslinked, preferably by exposure to UV radiation and/or energetic photons. The crosslinked polymers are particularly useful for making fibers, films, and nonwovens.
摘要:
A heterogeneous polymer blend comprises a dispersed phase comprising a thermoplastic first polymer having a crystallinity of at least 30% and a continuous phase comprising a second polymer different from the first polymer. The second polymer has a crystallinity of less than 20% and is at least partially cross-linked.
摘要:
A homogeneous polymer blend comprises a thermoplastic first polymer having a crystallinity of at least 30%; and a second polymer having a crystallinity of more than 5% and being at least partially cross-linked.
摘要:
The invention described relates to formed profiles comprising microcellular TPE foam compositions, and articles therefrom, wherein the TPE are thermoplastic vulcanizates. The foamed thermoplastic elastomer profile comprises a foamable thermoplastic elastomer composition having a) a cross-linkable hydrocarbon rubber in the presence of b) a thermoplastic polyolefin resin having a Tm greater than 120° C. wherein said composition further comprising: a) 25 to 30 wt % of a partially or fully vulcanized reaction product of said cross-linkable hydrocarbon rubber with a cross-linking agent, said reaction product being present as a dispersed phase; b) 7 to 12 wt % of said thermoplastic resin as a continuous phase; c) 8-22 wt % of an elastomeric thermoplastic modifier comprising 1) 3-7 wt. % copolymers of propylene with one or more of ethylene and C4-C10 alpha-olefins, said copolymers having a Tm greater than 20° C. and less than 120° C., and, 2) 5-15 wt. % hydrogenated, triblock styrenic copolymers from styrene and isoprene; and, optionally, d) 3-12 wt. % solid filler; and/or e) 35-45 wt. % of non-aromatic hydrocarbon oil; wherein said wt. % amounts are based upon the total weight of the composition, and where the composition has been prepared by a process comprising dynamically vulcanizing said composition. The foamed thermoplastic elastomer profiles having smooth surfaces, improved low water absorption, improved compression set and compression load deflection.