摘要:
A loosely laid water-proof membrane of elastomeric material (11) covering a flat roof is combined with a series of hold-down devices (14) for securing the membrane to the roof deck (12) against wind-generated uplift forces. Each hold-down device (16) comprises a disc (17) having a domed, downwardly concave, middle portion (17a) and a surrounding, generally flat, transverse peripheral portion (17b) the radial width of which is equal to between about 25% and 50% of the radius of the disc as a whole. The discs, with their concavities facing the membrane, are arranged on the latter at predetermined spacings, being fixed in place by metallic fasteners (18) driven through the domed portions and the membrane deeply into the roof deck. The concavity of each disc is filled with a sealant (20), so that as each disc is pressed down upon tightening of the associated fastener, the sealant is pressed down against the membrane as well as inwardly against the fastener and outwardly against the peripheral portion of the disc. An elastomeric flat ring gasket (19) may also be located between each disc's peripheral portion and the underlying membrane.
摘要:
Disclosed is a process for preparing p-nitrosodiphenylamine hydrochloride from N-nitrosodiphenylamine and hydrogen chloride. The product is prepared in the absence of an aromatic solvent and using a solvent consisting essentially of aliphatic C 5 -C 10 alcohol. Also described is a composition which comprises essentially p-nitrosodiphenylamine hydrochloride and a C 5 -C 10 saturated aliphatic alcohol.
摘要:
A flexible power transmission belt having a plurality of teeth (13) each of which has a pair of arcuate convex flank portions (21, 22) which in longitudinal cross-section closely approximate to an arc of a circle. Each tooth exhibits a height (H) to width (W) relationship within a predetermined range, and the arcuate flanks each have a pressure angle (a) within a predetermined range. The belt is preferably used in combination with a toothed pulley whose teeth are substantially conjugate to the belt teeth and whose cavities between the teeth have a height to width relationship within another predetermined range and have concave flanks exhibiting a pressure angle in still another predetermined range, said belt tooth width being approximately 0.98 of the pulley cavity width so as to provide a high torque positive drive power transmission system having very low backlash.
摘要:
A non-yellowing antioxidant-UV stabilizer combination especially useful in AES polymers comprising (A) at least one antioxidant selected from: (i) a thiodialkylene bis-(3,5-dialkyl-4-hydroxy) hydrocinnamate antioxidant; (ii) an N,N'-alkylene bis-(3,5-dialkyl-4-hydroxy) hydro- cinnamamide antioxidant; (iii) an O,O-dialkyl-3,5-dialkyl-4-hydroxybenzyl phosphonate antioxidant; (iv) an oxamidobis alkyl (3,5-dialkyl-4-hydroxyphenyl) propionate antioxidant; and (v) a [3-(3,5-dialkyl-4-hydroxyphenyl)propionamido]alkyl stearate antioxidant; and (B) a UV stabilizer package comprising: (vi) at least one UV stabilizer of the hindered amine type, with or without (vii) at least one UV absorber.
摘要:
Pyrazoles useful as herbicides have the formula wherein R' is C 1 -C 4 haloalkyl or ROR 5 , wherein R is C 1 -C 2 alkylene or C 2 alkylidene and R 6 is hydrogen, C 1 -C 4 afkyl, C 2 -C 5 alkanoyl, aroyl, C 8 -C 10 aralkanoyl, C 7 -C 9 aralkyf, phenyl, or phenyl substituted with C 1 -C 4 alkyl, C 1 -C 4 alkoxy, trihalomethyl, hydroxy, cyano or nitro; or benzoyl substituted with halogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, trihalomethyl, hydroxy, cyano or nitro: R 2 is C 1 -C 4 alkyl, C 5 -C 6 cycloalkyl, C 7 -C 8 aralkyl, C 7 -C 9 alkaryl, phenyl, naphthyl or a 5- or 6- membered heterocyclic group containing oxygen, sulfur or nitrogen, or R 2 is phenyl substituted with halogen, trihalomethyl, C 1 -C 4 alkoxy. hydroxy or cyano; Y is oxygen or sulfur, R 3 is C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 3 -C 4 alkynyl, C 2 -C 6 alkoxyalkyl or C 2 -C 6 alkylthioelkyl; R 4 is hydrogen. C 1 -C 4 alkyl or trihalomethyl; provided that R 2 is not 3,4-dialkylphenyl or 3,4 dihalophenyl. Compositions including the above pyrazoles used as preemergence and postemergence treatment of weeds are also described.
摘要:
An organophosphorus compound, useful in controlling pests, having the formula wherein R is C 1 -C 3 alkyl or phenyl, R' is hydrogen or R and R 1 together form a 1,3-butadien-1,4-diyl group optionally substituted with a methyl or chloro group, or R and R 1 together form a 1,2-ethenediylthio group wherein sulfur is attached to carbon; R 2 is hydrogen or halogen; X is oxygen or sulfur; R 3 is C 1 -C 3 alkyl; and R 4 is C 1 -C 3 alkoxy or propythio and their hydrochlorides, with the proviso that if R is phenyl, R 3 is methyl and R 4 is methoxy is disclosed. Compositions containing the active compound and methods of controlling pests, are also disclosed.
摘要:
An organophosphorus compound, useful in controlling pests, having the formula wherein R is C 1 -C 3 alkyl or phenyl, R 1 is hydrogen or R and R' together form a 1,3-butadien-1,4-diyl group optionally substituted with a methyl or chloro group, or R and R' together form a 1,2-ethenediylthio group wherein sulfur is attached to carbon; R 2 is hydrogen or halogen; X is oxygen or sulfur; R 3 is C 1 -C 3 alkyl; and R 4 is C 1 -C 3 alkoxy or propylthio and their hydrochlorides, with the proviso that if R is phenyl, R 3 is methyl and R 4 is methoxy is disclosed. Compositions containing the active compound and methods of controlling pests, are also disclosed. Also disclosed is the intermediate where R, R 1 and R 2 have the meanings given above, said intermediate useful as a reactant in the synthesis of the organophosphorus compound of this invention.
摘要:
An expandable and curable polyester composition comprising a mixture of a liquid, ethylenically unsaturated polyester resin composition; a peroxide; an organometallic promotor; and a dialkyl or trialkyl hydrazine is disclosed. In addition, a method for forming said expanded and cured polyester resin composition, and the product formed in accordance with said method, an expanded and cured polyester resin composition, is taught.
摘要:
An organophosphorus compound, useful in controlling pests, having the formula wherein R is C 1 -C 3 alkyl or phenyl, R 1 is hydrogen or R and R' together form a 1,3-butadien-1,4-diyl group optionally substituted with a methyl or chloro group, or R and R' together form a 1,2-ethenediylthio group wherein sulfur is attached to carbon; R 2 is hydrogen or halogen; X is oxygen or sulfur; R 3 is C 1 -C 3 alkyl; and R 4 is C 1 -C 3 alkoxy or propylthio and their hydrochlorides, with the proviso that if R is phenyl, R 3 is methyl and R 4 is methoxy is disclosed. Compositions containing the active compound and methods of controlling pests, are also disclosed. Also disclosed is the intermediate where R, R 1 and R 2 have the meanings given above, said intermediate useful as a reactant in the synthesis of the organophosphorus compound of this invention.