摘要:
Heteroatom containing perfluoroalkyl terminated neopentyl mercapto-alcohols of the formulas I and IIHS--[CH.sub.2 C(CH.sub.2 X--E--R.sub.f).sub.2 CH.sub.2 ]--OH (I)HS--[CH.sub.2 C(CH.sub.2 X.sub.1 --R.sub.f).sub.2 CH.sub.2 ]--OH (II)are prepared from the corresponding perfluorinated neopentyl oxetanes where R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms, E is a linking group, and X and X.sub.1 are heteroatom moieties.The reaction products of these fluorinated mercapto-alcohols with electrophiles are disclosed as are certain functional derivatives. Compositions containing such materials provide improved thermal stability and useful low surface energy oil and water repellent coatings for textiles, glass, paper, leather, and other materials.
摘要:
Heteroatom containing perfluoroalkyl terminated neopentyl glycols of the formulas HO[--CH.sub.2 C(CH.sub.2 X--E--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H or HO[--CH.sub.2 C(CH.sub.2 X--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H are prepared from halogenated neopentyl glycols or oxetanes and thiols of the formula R.sub.f --E--SH, amines of the formula R.sub.f --E--NH--R, alcohols of the formula R.sub.f --E--OH or perfluoro-amides, wherein R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms.The polymeric reaction products of said fluorinated diols, and optionally other diols with isocyanates to prepare polyurethanes; with amines and isocyanates to prepare polyureas/polyuretanes; with acids or derivatives to prepare polyesters or polycarbonates are disclosed. These include polymeric, random or block urethane, and/or urea, and/or ester compositions containing the residue of at least one R.sub.f -neopentyl glycol containing two perfluoroalkyl hetero groups.These polymeric compositions provide improved thermal stability and useful low surface energy oil and water repellent coatings, and soil-release properties for textiles, glass, paper, leather and other materials.
摘要:
Heteroatom containing perfluoroalkyl terminated oxetanes of the formula ##STR1## the formula ##STR2## are prepared from 3,3-dihalogenated oxetanes and thiols of the formula R.sub.f -E-SH, amines of the formula R.sub.f -E-NH-R, alcohols of the formula R.sub.f -E-OH or perfluoro-amides, wherein R.sub.f is a straight chain perfluoroalkyl of 1 to 18 carbon atoms.The reaction products of these fluorinated oxetanes with nucleophiles are disclosed, as are certain functional derivatives. These products may serve as intermediates or have utility in their own right. Fluorinated polyethers derived therefrom are disclosed and include random or block compositions containing the residue from at least one R.sub.f oxetane, containing two perfluoroalkyl hetero groups.These polyethers provide improved thermal stability and useful low surface energy oil and water repellent coatings for textiles, glass, paper, leather and other materials.
摘要:
Co-oligmers of the formula R.sub.f --E.sub.m --(S).sub.n --[M.sub.1 ].sub.x --[M.sub.2 ].sub.y --H and mixtures thereof, wherein R.sub.f is a perfluoroalkyl group, E is a linkage group, M.sub.1 represents a non-ionic hydrophilic monomer unit, M.sub.2 represents an anionic hydrophilic monomer unit, n and m are optionally 0 or 1, and x and y represent the number of monomer units present in the novel co-oligomers, the sum of x and y being between 5 and 200, and y/(x+y) being between 0.01 and 0.98; are useful as additives in polar-solvent fire-fighting compositions when used in conjunction with polysaccharides and other adjuvants. They improve dynamic foam stability and vapor suppressing ability of the foam, thereby reducing the flammability of polar solvent contaminated foams and consequently improving extinguishment and burnback resistance.
摘要:
Heteroatom containing perfluoroalkyl terminated neopentyl mercapto-alcohols of the formulas I and IIHS--[CH.sub.2 C(CH.sub.2 X--E--R.sub.f).sub.2 CH.sub.2 ]--OH (I)HS--[CH.sub.2 C(CH.sub.2 X.sub.1 --R.sub.f).sub.2 CH.sub.2 ]--OH (II)are prepared from the corresponding perfluorinated neopentyl oxetans where R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms, E is a linking group, and X and X.sub.1 are heteroatom moieties.The reaction products of these fluorinated mercapto-alcohols with electrophiles are disclosed as are certain functional derivatives. Compositions containing such materials provide improved thermal stability and useful low surface energy oil and water repellent coatings for textiles, glass, paper, leather, and other materials.
摘要:
Heteroatom containing perfluoroalkyl terminated neopentyl glycols of the formulas HO[--CH.sub.2 C(CH.sub.2 X--E--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H or HO[--CH.sub.2 C(CH.sub.2 X--R.sub.f).sub.2 CH.sub.2 O].sub.1-3 --H are prepared from halogenated neopentyl glycols or oxetanes and thiols of the formula R.sub.f --E--SH, amines of the formuls R.sub.f --E--NH--R, alcohols of the formula R.sub.f --E--OH or perfluoro-amides, wherein R.sub.f is a straight or branched chain perfluoroalkyl of 1 to 18 carbon atoms or said perfluoroalkyl substituted by perfluoroalkoxy of 2 to 6 carbon atoms.The polymeric reaction products of said fluorinated diols, and optionally other diols with isocyanates to prepare polyurethanes; with amines and isocyanated to prepare polyureas/polyurethanes; with acids or derivatives to prepare polyesters or polycarbonates are disclosed. These include polymeric, random or block urethane, and/or urea, and/or ester compositions containing the residue of at least one R.sub.f -neopentyl glycol containing two perfluoroalkyl hetero groups.These polymeric compositions provide improved thermal stability and useful low surface energy oil and water repellent coatings, and soil-release properties for textiles, glass, paper, leather and other materials.
摘要:
Virtual storage systems, virtual storage methods and methods of over committing a virtual RAID storage system are described. According to one aspect, a virtual storage system includes a virtual storage space, a physical storage space, a mapping system configured to associate a plurality of addresses of the virtual storage space with respective addresses of the physical storage space and a controller configured to automatically remove a portion of the mapping system according to a prioritization protocol which specifies removal of portions of the mapping system according to an order.
摘要:
Embodiments of a radiation detector and subassemblies thereof are provided having a scintillator with a face and a reflector constructed and arranged to redirect a majority of light leaving the face of the scintillator at an angle within a range of 45 to 135 degrees compared to the direction in which the light was traveling when it left the face. In other embodiments a method is provided including receiving radiation into a scintillator having a face, producing light with the scintillator in response to the radiation, allowing at least a portion of the light to leave the face, and reflecting a majority of the light leaving the face at an angle within a range of 45 to 135 degrees compared to the direction in which the light was traveling when it left the face with a reflector. Other embodiments are directed to a reflector including a plurality of prisms having a first face and a second face with a barrier on the first face.
摘要:
An imitation cheese composition containing moisture, preferably in an amount that is at least 55% by weight, a hydrocolloid, a cheese-derived component, preferably in an amount less than about 15% by weight of the composition, cheese flavoring that is natural or artificial and an acidulent, preferably in an amount that causes a pH of the composition to be not greater than 4.6. The composition is sufficiently firm such that it can be at least one of sliced, cut, shredded or grated. Preferably, protein in an amount not greater than 6% by weight of the composition is present, and/or the acidulent is in a total titrateable amount of less than 1.5% by weight of the composition, resulting in an imitation cheese having a flavor, texture and consistency that was only previously attainable in a pasturized process cheese product.
摘要:
Heteroatom containing R.sub.f -neopentyl compounds having formula III or IV ##STR1## wherein R.sub.f is a straight chain perfluoroalkyl of 1 to 18 carbon atoms, E is branched or straight chain alkylene of 2 to 10 carbon atoms or said alkylene interrupted by one to three groups selected from the group consisting of --NR--, --S--, --COO--, --OOC--, SO.sub.2 --, --CONR--, --NRCO--, --SO.sub.2 NR--, and --NRSO.sub.2 --, or terminated at the R.sub.f end with --CONR-- or --SO.sub.2 NR--, where R.sub.f is attached to the carbon or sulfur atom, or R.sub.f is trifluoroethylene, and for formula III, X is --S--, --SO.sub.2 --, or --NR--, or for formula IV, X is --CONR--, or --SO.sub.2 NR--, or a direct bond where R.sub.f is attached to the carbon or sulfur atom, and where R is independently hydrogen, alkyl of 1 to 6 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms, and one or both of T.sub.1 and T.sub.2 is the residue of a mercapto mono- or dicarboxylic acid of 2 to 4 carbon atoms after removal of the hydrogen from the mercapto group and the other of T.sub.1 and T.sub.2 is hydroxyl.