摘要:
Stabilized polyethylene materials which offer an advantageously balanced combination of thermal, mechanical and processing properties, and which maintain their physical properties in chlorinated water environments are disclosed. The materials include an antioxidant system with components to provide extraction resistance in hot water environments and additionally provides oxidation resistance to both chlorine in the water interior of the pipe and oxygen in contact with the pipe's exterior.
摘要:
The invention is related to compositions suitable for the fabrication of pipes, and other articles, with excellent performance properties. The invention provides a composition, comprising a blend, wherein said blend comprises a high molecular weight ethylene-based interpolymer and a low molecular weight ethylene-based interpolymer, and the high molecular weight ethylene-based interpolymer is a heterogeneously branched linear or a homogeneously branched linear ethylene-based interpolymer, and has a density from 0.922 g/cc to 0.929 g/cc, and a high load melt index (I21) from 0.2 g/10 min to 1.0 g/10 min, and the low molecular weight ethylene-based interpolymer is heterogeneously branched linear or a homogeneously branched linear ethylene-based interpolymer, and has a density from 0.940 g/cc to 0.955 g/cc, and a melt index (I2) from 6 g/10 min to 50 g/10 min. The blend has a single peak in an ATREF profile eluting above 30° C., and has a coefficient of viscosity average molecular weight (CM?) less than −0.0032 in the log(calculated Mv) versus elution temperature, said CMv calculated in the range of elution temperatures from 70° C. to 90° C. The Mv is the viscosity average molecular weight.
摘要:
Sulfonated substantially random interpolymers made from monomer components comprise from 1 to 65 mole percent of (a) at least one vinyl or vinylidene aromatic monomer, or (b) at least one hindered aliphatic or cycloaliphatic vinylidene monomer, or (c) a combination of at least one vinyl or vinylidene aromatic monomer and at lest one hindered aliphatic or cycloaliphatic vinylidene monomer, and from 35 to 99 mole percent of at least one aliphatic &agr;-olefin having from 2 to 20 carbon atoms; and optionally, from 0 to 20 mole percent of a diene containing from 4 to 20 carbon atoms; wherein the sulfonated interpolymer contains at least one mer (or moiety) of a group represented by the formula —SO3M where M is hydrogen or a group 1, 7 or 12 metal in ionic form or combination thereof. Blends of these polymers with polyamides and polyolefins are made.
摘要:
This invention includes a process for forming a thermoplastic vulcanizate comprising: (a) admixing a C—H insertion curing agent with at least one elastomeric phase polymer to form a first admixture; (b) admixing at least one non-elastomeric polyolefin with the first admixture to form a second admixture; and (c) heating the second admixture to a temperature at least the decomposition temperature of the curing agent to crosslink the elastomeric phase while mixing the admixture to an extent sufficient to result in the formation of a thermoplastic material, hereinafter referred to as a thermoplastic vulcanizate, and optionally including an additional step (d) of shaping the resulting thermoplastic vulcanizate, especially by heating and foaming or molding the TPV. The C—H insertion curing agent is preferably selected from alkyl and aryl azides (R—N3), acyl azides (R—C(O)N3), azidoformates (R—O—C(O)—N3), sulfonyl azides (R—SO2—N3), phosphoryl azides ((RO)2—(PO)—N3), phosphinic azides (R2—P(O)—N3) and silyl azides (R3—Si—N3), with poly(sulfonyl azide) most preferred. Additionally, the invention includes a thermoplastic vulcanizate comprising a blend of: (1) an elastomeric phase crosslinked using a C—H insertion curing agent dispersed in; (2) at least one non-elastomeric thermoplastic polyolefin. The invention also includes a foamable composition comprising (1) an elastomeric phase crosslinked using a C—H insertion curing agent dispersed in; (2) at least one non-elastomeric thermoplastic polyolefin; and (3) from about 0.1 to about 25 percent by weight based on the combined weight of components (1) and (2) of at least one foaming agent as well as a fabricated part, cable jacket, cable insulation, or foam comprising the thermoplastic vulcanizate or the invention or resulting from the process of the invention.
摘要:
A polymer blend comprising:a) a syndiotactic monovinylidene aromatic polymer,b) a polyamide,c) a compatibilizing polymer for a) and b),d) a rubbery polyolefin impact modifier, optionally extended with an oil,e) a domain forming rubbery polymer,f) a polar group functionalized rubbery polyolefin, andg) optionally, a compatibilizing polymer for a) and d).
摘要:
A composition of matter, being an admixture of polycarbonate and an aliphatic thio compound, molded articles of which release cleanly from, and without adhesion to, a mold.
摘要:
The invention provides a composition comprising the following: A) an ethylene-based polymer; B) a compound selected from Formula 1, as shown herein, wherein R1 and R2 are each independently selected from a C1-C20 alkyl group; X is selected from Cl, Br, I, F, OH, NH2, NHR′ or NR′R″, where R′ and R″ are each independently a C1-C6 alkyl; n is from 1 to 10; and m is from 10 to 30; and wherein this compound is present in an amount greater than, or equal to, 500 ppm, based on the total weight of the composition; C) a compound selected from Formula 2, as shown herein, wherein R1, R2 and R3 are each independently selected N from a C1-C20 alkyl group; R4, R5, R6, R7, R8 and R9 are each independently selected from a C1-C20 alkyl group; X1, X2 and X3 are each independently selected from Cl, Br, I, F, OH, NH2, NHR′ or NR′R″, where R′ and R″ are each independently a C1-C6 alkyl; n is from 1 to 6; m is from 1 to 6; and o is from 1 to 6; and wherein the weight ratio of Component C to Component B (C/B) is greater than 1.
摘要:
Stabilized polyethylene materials which offer an advantageously balanced combination of thermal, mechanical and processing properties, and which maintain their physical properties in chlorinated water environments are disclosed. The materials include an antioxidant system with components to provide extraction resistance in hot water environments and additionally provides oxidation resistance to both chlorine in the water interior of the pipe and oxygen in contact with the pipe's exterior.
摘要:
The present invention relates to an improved process for online measurement of monomer concentration, specifically bisphenol A, in an interfacial polycarbonate manufacturing process. Wherein the measurement is obtained by vibrational spectroscopy for the purpose of improving process control, specifically, controlling the carbonate polymer molecular weight.
摘要:
The invention relates to functionalized interpolymers derived from base olefin interpolymers, which are prepared by polymerizing one or more monomers or mixtures of monomers, such as ethylene and one or more comonomers, to form an interpolymer products having unique physical properties. The functionalized olefin interpolymers contain two or more differing regions or segments (blocks), resulting in unique processing and physical properties.