摘要:
The invention provides compositions comprising at least one propylene-based polymer, at least one peroxide and at least one coagent. In a preferred example, a composition comprising at least one propylene-based polymer, at least one peroxide, at least one grafting agent, and at least one coagent, and wherein the at least one coagent has a substituted carbon-carbon double bond structure selected from the group consisting of structures (I), (II), (III), (IV) and (V) as follows, including cis and trans isomers wherein D1, D2, D3 and D4 are each, independently, one of the following: (a) a hydrocarbon substituent containing a heteroatom with a nonbonding pair of electrons, and where the heteroatom with the nonbonding pair is directly attached to the carbon-carbon double bond, or (b) a hydrocarbon substituent containing a carbon-carbon pi bonding pair, and where the first carbon of the carbon-carbon pi bonding pair is directly bonded to the carbon-carbon double bond; and wherein the R1, R2 and R3 are each, independently, H, a hydrocarbon substituent, or a substituted hydrocarbon substituent; and wherein R1, R2 and R3, each, independently, does not have the same chemical structure as D1, D2, D3 or D4; and wherein the molar ratio of the “coagent(s)” to “free radicals formed from the peroxide(s)” is from 0.5:1 to 5:1; and wherein the coagent selected from structures (I)-(V) does not contain only one phenyl group, or does not contain only one furyl group.
摘要:
The invention relates to an improved process for controlling the amount of crosslinking in polyolefin based articles such as fibers or films. The invention relates to mixing silane grafted material together with ungrafted material prior to crosslinking. The article can then be formed and cured, optionally with a curing catalyst which can preferably be applied to the surface of a shaped article. The amount of crosslinking will be controlled in part by the level of silane grafting on the grafted silane material as well as the amount of the grafted material in the blend.
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.
摘要:
An improved process for crosslinking a polyolefin polymer is described. The process involves grafting a silane material onto the polyolefin based polymer in the presence of a free radical generating initiator material and then hydrolyzing the silane material to form crosslinks. By using an effective molar ratio of silane material to free radical of 40 or greater in the grafting reaction, premature crosslinking is controlled and the grafted polymer can be shaped first and then crosslinked. In another aspect of the invention, the crosslinking process is improved by adding a catalyst for the hydrolysis catalyst to the surface of a shaped article made from the grafted polymer. Grafted polymer and articles made from the grafted polymer, particularly fibers, are also disclosed.
摘要:
An optical sensor for monitoring a utility meter having a sweep hand indicator that moves over a meter surface of the utility meter. The optical sensor has a single infrared light emitter and two photo diodes detectors. The infrared light emitter is positioned at an angle with respect the meter surface and the sweep hand indicator of the utility meter so that the sweep hand indicator is illuminated from an angle to provide a shadow of the sweep hand indicator. The photo detectors detect changes in the intensity of light reflected on the sweep hand indicator and the background surface as well as the shadow of the sweep hand indicator. The two photo diode detectors are electrically coupled in series but in opposite directions relative to an output node, so as to cancel each other at the output node in normal operation. The passing of the sweep hand indicator changes the signal produced of each of the photo diode detectors at the output node, independently but in opposite directions.
摘要:
Novel organic ion-exchange polymers and membranes formed from these polymers provide improved performance in electrolytic cells. The membranes exhibit an expanded micro-structure as the result of the removal of organic groups previously reacted with the ion-exchange groups of the polymer. The polymers are also useful in finely divided form as catalysts or deposited on a catalyst support. When formed into sheets, the polymers are useful as membranes in the separation of miscible liquids and in the separation of gases.
摘要:
Novel organic ion-exchange polymers and membranes formed from these polymers provide improved performance in electrolytic cells. The membranes exhibit an expanded micro-structure as the result of the removal of organic groups previously reacted with the ion-exchange groups of the polymer. The polymers are also useful in finely divided form as catalysts or deposited on a catalyst support. When formed into sheets, the polymers are useful as membranes in the separation of miscible liquids and in the separation of gases.
摘要:
An X-ray generator system comprising a pressurized fluid source disposed for directing dielectric coolant fluid through a housing wherein an X-ray source may be electrically connected for generating X-rays, the system including a venturi device having a restricted passage through which the fluid flows and which is disposed in communication with portions of the housing where gas bubbles may accumulate in the fluid. Thus, the fluid flowing through the restricted passage of the venturi device produces a reduction in pressure which draws fluid from said portions of the housing so that any gas bubbles accumulated therein may be purged from the system.
摘要:
Disclosed are polyolefin copolymer films comprising alkoxysilane groups and a catalyst for cross-linking the alkoxysilane groups; wherein the cross-linking catalyst is a Lewis or Bronsted acid or base compound that has a relatively high melting point and therefore initiates the cross-linking essentially only at the lamination temperature, preferably at or above at least 50° C. Also disclosed are films wherein (i) the layer or layers comprising the alkoxysilane groups, including surface layer(s), comprise the cross-linking catalyst; or (ii) layer or layers comprising alkoxysilane groups do not contain cross-linking catalyst and have a facial surface in adhering contact with a layer of a thermoplastic polyolefin copolymer comprising the cross-linking catalyst; or (iii) there is a combination of layers (i) and (ii). Also disclosed are laminated glass structures and processes for their preparation that employ such films. The disclosed laminate structures include safety glass and photovoltaic modules.
摘要:
Laminated structures comprising a (i) glass layer, (ii) first alkoxysilane-containing polyolefin (PO) layer, (iii) catalyst layer, and (iv) second alkoxysilane-containing polyolefin layer, each layer having opposing facial surfaces, are prepared by a method comprising the steps of applying in adhering contact: A. One facial surface of the first PO layer to one facial surface of the glass layer; B. The catalyst layer to the facial surface of the first PO layer opposite the facial surface of the first PO layer in adhering contact with the glass layer; and C. The second PO layer to the facial surface of the catalyst layer opposite the facial surface of the catalyst layer in adhering contact with the first PO layer.