摘要:
A durably soil-resistant pile fabric, such as a carpet, is provided which comprises a plurality of organic fibers having thereon a normally solid coating comprising (a) a first phase of a water-insoluble fluoroaliphatic radical free urethane adduct having at least one major transition temperature higher than about 45.degree. C. and melting to a flowable liquid below about 200.degree. C. and (b) a second phase of waterinsoluble fluoroaliphatic radical containing urethane adduct having at least one major transition temperature higher than about 45.degree. C. and melting to a flowable liquid below about 200.degree. C.
摘要:
Polymers that have a number average molecular weight of at least 1000 and that contains at least 5% by weight of segments that contain at least two consecutively recurring cyclic ether units wherein at least one of said tetrahydropyran 2,6-diyl unit of the formula ##STR1## and wherein the remainder of said cyclic ether units are selected from said tetrahydropyran 2,6-diyl units and tetrahydrofuran 2,5-diyl units of the formula ##STR2## wherein R.sup.1, R.sup.8, R.sup.9, R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.14 are each selected from hydrogen and lower alkyl groups;R.sup.2 and R.sup.7 are each selected from hydrogen, lower alkyl groups and aryl groups;R.sup.4 and R.sup.5 are each selected from hydrogen, lower alkyl groups, aryl groups and halo; andR.sup.3 and R.sup.6 are selected from hydrogen, lower alkyl groups and aryl groups or combine to form a divalent linking moiety having the formula ##STR3## wherein C.sup.7 and C.sup.8 are joined to the C.sup.3 and C.sup.5 positions respectively of said cyclic ether units; W, X, Y and Z are each monovalent groups or W and Z are each monovalent groups and X and Y combine to form a divalent linking moiety, that bridges between C.sup.7 and C.sup.8.
摘要:
Complex compositions that comprise a cation guest and a polymer host are provided. The polymer host contains one or more cation-complexing segments that contain hetero atoms in a polydentate complexing array. At least two of the hetero atoms in the cation complexing segment comprise a cyclic ether selected from tetrahydrofuran 2,5-diyl units and tetrahydropyran 2,6-diyl units.
摘要:
Process for preparing linear terminally differentially electrophilically reactive prepolymers by reacting cyclic ethers or lactones comprising a major proportion of tetramethylene oxide with an initiator represented by the asymmetrical structureYO.sub.m SO.sub.2 R.sub.n Q,whereinQ is a first radical which in anionic form is a non-terminating anion in the polymerization of tetramethylene oxide;Y is a second radical, free from alkylatable groups, selected from alkyl, alkaryl, aryl, aralkyl and cycloalkyl and having the free valence on a carbon atom devoid of halogen atoms;n = 0 or 1;m = 0 or 1; andR is a divalent bridging radical comprising at least one oxyalkylene radical --(OR').sub.q where q is 1 to 300 and preferably 1 to 50, and R' is alkylene of 2 to 10 carbon atoms, at least half being C.sub.4 H.sub.8.The differentially electrophilically reactive prepolymers have different reactivity at the two ends so that successive reagents can react with the two ends to give product prepolymers having two unlike terminations. Such product prepolymers can provide segmented copolymers having utility as adhesives, elastomers and protective coatings.
摘要翻译:通过使包含主要比例的四氢呋喃的环醚或内酯与由不对称结构YOmSO 2 R n Q表示的引发剂反应来制备线性末端差异亲电反应性预聚物的方法,其中Q是阴离子形式的第一个基团,其为阴离子形式的非终止阴离子 四氢呋喃的聚合; Y是不含可烷基的第二个基团,选自烷基,烷芳基,芳基,芳烷基和环烷基,并且在没有卤素原子的碳原子上具有游离价; N = 0或1; M = 0 OR 1; 和R是包含至少一个氧化烯基 - (OR')q的二价桥连基团,其中q为1至300,优选1至50,R 1为2至10个碳原子的亚烷基,至少一个为C 4 H 8。
摘要:
Mechanisms and techniques for database fragment cloning and management are provided. A database object, such as a table, rowset or index, is divided into fragments. Each fragment is cloned to create cloned fragments, which operationally are substantially identical to one another. One or more of the cloned fragments may be designated as a primary cloned fragment for performing database operations or as a secondary cloned fragment for serving as backup. Updates to each fragment are implemented on the primary cloned fragment and are then propagated from the primary cloned fragment to the corresponding secondary cloned fragments. A cloned fragment can go offline, becoming unavailable to be updated. When the cloned fragment returns online, the cloned fragment is refreshed with data included in the primary cloned fragment. While being refreshed, the cloned fragment may continue to be updated. The cloned fragment is eligible to be designated as a primary cloned fragment when the refreshing process has been completed.
摘要:
Translation architecture that facilitates translation between schema data and relational structures. The architecture includes a translation component that consumes schema data (e.g., an XML schema) that includes a schema structure, validates the schema structure, and persists in memory a representation of the schema as a relational format. Since schemas are shredded into tables, instance validation loads only the necessary components to perform validation. During validation, only parts of the schema that are used are loaded and cached. A schema cache stores the in-memory representation of schema optimized for instance validation. Schema components are loaded from metadata into main memory as read-only objects such that multiple users can use the in-memory objects for validation, query processing, query optimization and storage optimization of XML instance data
摘要:
A two-wheel drive bicycle includes a main frame having a steering head, a seat tube, a cross bar and a hollow downtube. A main drive mechanism includes a housing, a driving spindle, at least one driven ring gear, a first driven shaft and a second driven shaft. The first driven shaft is rotatably connected to the housing and operably coupled to the at least one driven ring gear. The second driven shaft is, likewise, rotatably connected to the housing and operably coupled to the at least one driven ring gear. Front and rear wheel drive mechanisms include a series of shafts that are themselves coupled to and between the first and second driven shafts and the front and rear wheels. The main drive mechanism preferably includes a plurality of driven gears comprising a series of concentrically spaced ring gears. Each ring gear of the plurality of driven ring gears has an inner diametrical surface and an outer diametrical surface. Each outer diametrical surface is configured to slidingly engage the inner diametrical surface of an adjacent ring gear. Further, the main drive mechanism preferably includes a biasing means for biasing each ring gear away from the first driven shaft and the second driven shaft and a selective engagement means for selectively engaging one ring gear of the plurality of ring gears with the first driven shaft and the second driven shaft.
摘要:
Semicrystalline polymers can have predetermined amounts of their surfaces rendered amorphous or quasi-amorphous by irradiation. Further treatment of these polymer surfaces which have been so modified, such as crystallization, can produce surfaces with reduced coefficients of friction.
摘要:
A durably soil-resistant carpet is provided which comprises a plurality of organic fibers having thereon a normally solid coating comprising (a) at least one phase of a water-insoluble addition polymer derived from a polymerizable ethylenically unsaturated monomer free of non-vinylic fluorine, the polymer having at least one major transition temperature higher than about 45.degree. C. and a solubility parameter of at least about 8.5, and (b) at least one phase of a water-insoluble fluorinated component containing a fluoroaliphatic radical of at least 3 carbon atoms, the fluorinated component having at least one major transition temperature higher than about 45.degree. C.; and at least one of said phases being a continuous phase. Novel compositions and processes for the treatment of carpets to render them durably soil resistant are also provided.
摘要:
The present invention concerns a solid formulation for oral administration as a solid comprising polyethylene glycol and a further solid such as mannitol. The formulation may be used to prevent gastrointestinal disorders such as constipation in healthy subjects. In some embodiments, the solid formulation is chewable or suckable.