摘要:
The subject invention is directed to polymer compositions which comprise a homogeneous ethylene/&agr;-olefin interpolymer, a wax and a nucleating agent, wherein the nucleating agent is provided in an effective amount such that the percent elongation at break of the polymer composition is at least about fifty percent greater than the percent elongation at break of a comparative composition which lacks the nucleating agent. The polymer compositions of the invention will find utility in applications r equiring high elongation at break, while maintaining a high onset of crystallization temperature, such as in the high-speed coating of fabrics, carpet backing, floor tile and sheeting, and adhesives.
摘要:
The present invention relates to articles and heat storage devices for storage of thermal energy. The articles include a metal base sheet and a metal cover sheet, wherein the metal base sheet and the metal cover sheet are sealingly joined to form one or more sealed spaces. The articles include a thermal energy storage material that is contained within the sealed spaces. The sealed spaces preferably are substantially free of water or includes liquid water at a concentration of about 1 percent by volume or less at a temperature of about 25° C., based on the total volume of the sealed spaces. The articles include one or more of the following features: a) the pressure in a sealed space is about 700 Torr or less, when the temperature of the thermal energy storage material is about 25° C.; b) the metal cover sheet includes one or more stiffening features, wherein the stiffening features include indents into the sealed space, protrusions out of the sealed space, or both, that are sufficient in size and number to reduce the maximum von Mises stress in the cover sheet during thermal cycling; c) the metal cover sheet and/or the metal base sheet includes one or more volume expansion features; or d) the metal cover sheet has a thickness, tc, and the metal base sheet has a thickness, tb, wherein tc is greater than tb; so that the article is durable. For example, the article does not leak after thermal cycling between about 25° C. and about 240° C., for 1,000 cycles.
摘要:
The present invention relates to a thermal energy storage material (TESM) system (and associated methods). The TESM system comprises i) a container having a wall surface; and ii) a TESM in at least partial contact with the wall surface. The TESM may include, consist essentially of, or consist of a metal containing compound comprising at least two different metal cations and one or more polyatomic anions. The at least two metal cations may include lithium cations. The TESM may have a liquidus temperature, TL, from about 100° C. to about 250° C. The TESM may exhibits a heat storage density from 300° C. to 80° C. of at least 1 MJ/l. The TESM system may be free of water. If any water is present in the TESM system, the water concentration preferably is less than about 10 wt. %. Preferably, the TESM system is generally resistant to corrosion at temperatures of about 300° C.
摘要:
The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom, such as high topload blow moldings and transmission and distribution pipes. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (HMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. The composition is characterized as having a bimodal molecular weight distribution, and a ductile-brittle transition temperature, Tdb, of less than −20° C. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.
摘要:
The invention relates to a polyethylene composition with a bimodal molecular weight distribution and articles made therefrom. The composition comprises a low-molecular-weight (LMW) ethylene homopolymer component and a homogeneous, high-molecular-weight (LMW) ethylene interpolymer component, wherein the LMW component is characterized as having a molecular weight distribution, MWDL, of less than about 8. In some embodiments, the HMW component is characterized by a reverse comonomer distribution.
摘要:
A composition of matter comprising: A) from 25 to 90 parts by weight of a syndiotactic, vinylaromatic polymer, B) from 5 to 30 parts by weight of an oil extended, elastomeric polyolefin; C) from 1 to 10 parts by weight of a compatibilizer comprising a styrene containing block copolymer or a hydrogenated derivative thereof; D) from 0 to 25 parts by weight of a domain forming rubbery polymer comprising a styrene/conjugated diene triblock copolymer or a hydrogenated derivative thereof; E) from 0 to 5 parts by weight of a nucleator for the syndiotactic, vinylaromatic thermoplastic resin, F) from 0 to 60 parts by weight of a reinforcing agent, and G) from 0 to 90 parts by weight of a polyarylene ether or polar group modified polyarylene ether.
摘要:
An aqueous polyurethane dispersion compositions are disclosed. The compositions include a polyurethane prepolymer dispersed in an aqueous medium, the polyurethane prepolymer comprising an isocyanate and a crystalline polyester polyol having a hydroxyl content of 20 to 150 mg KOH/g and a melt temperature of less than or equal to 90° C. Methods of forming a laminate are also disclosed. The methods include providing an aqueous polyurethane dispersion, applying the polyurethane dispersion to a surface of the first substrate, bringing the side of the first substrate into contract with a surface of the second substrate, and curing the aqueous dispersion, thereby laminating the first substrate to the second substrate. Laminates formed by the methods and including the compositions are also disclosed.
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:
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:
A method to join pipe is disclosed using a curable one or two part adhesive composition comprising an effective amount of a boron containing initiator compound such as an organoborate, a stabilized organoborane complex, or combinations thereof; one or more monomers, oligomers, polymers or mixtures thereof having olefinic unsaturation which is capable of polymerization by free radical polymerization; and optionally a decomplexing agent.