摘要:
The invention relates to a method for preparing microcellular polyurethane elastomer by reacting an organic isocyanate, a polyester polyol, a difunctional chain extender and a blowing agent, wherein at least a part of the polyester polyol used consists of a polyester polyol having a hydroxyl number between 28 and 112 and comprising units derived from aliphatic and/or aromatic dicarboxylic acids and from aliphatic, cycloaliphatic and/or heterocyclic glycols, as well as between 0.02 and 11 mole percent of units derived from monoalkanolamine with respect to the total amount of glycol and monoalkanolamine present in the polyester polyol.
摘要:
A polyester polyol derived from a polyalkoxylated by-product of pentaerythritol manufacture and polycarboxylic acids, the latter being themselves by-products from the production of adipic acid or terephthalic acid or derivatives thereof, useful for the manufacture of rigid foam.
摘要:
The invention relates to a polymeric polyamine having a molecular weight of from 1000 to 16000 and containing from 2 to 4 primary amino groups per molecule, the polymeric polyamine being the condensation product of a polycarboxylic acid or ester with a stoichiometric excess of a polyamine having terminal aminopropoxy groups and a molecular weight below 500.
摘要:
The invention relates to a process for producing a polyurea or polyurea/polyurethane compound by reaction of an organic polyisocyanate with a diamine chain extender and an isocyanate-reactive polymer, the latter consisting at least in part, in a polymeric polyamine havng a molecular weight of from 1000 to 16000, containing from 2 to 4 primary amino groups per molecule, and being the condensation product of a polycarboxylic acid or ester with a stoichiometric excess of a polyamine having terminal propoxy groups and a molecular weight of from 500 to 5000.
摘要:
Sheets or moulded bodies, for example particle board, are manufactured by hot pressing a lignocellulosic material in contact with an organic polyisocyanate and a wax release agent which is a vegetable wax, a modified vegetable oil, a microcrystalline wax or a mineral wax, said wax release agent having a melting point of at least 70.degree. C. Preferably the wax release agent is applied to the lignocellulosic material in the form of a dispersion in an aqueous emulsion of the polyisocyanate. The process facilitates the release of the sheets or moulded bodies from the caul plates or platens of the press.
摘要:
A dust sock filter medium laminate is provided which has at least two nonwoven webs of microfibers which have an average diameter (using a sample size of at least 10) between about 10 and 25 microns and which webs have been joined by a method comprising the steps of (a) directing the component layers to a separation zone, (b) applying water in the amount of from about 5% to 25% based on the weight of the combined layers, (c) combining the component layers, (d) passing the combination through a sonic bonder operating within the range of up to about 40,000 cps against a patterned anvil to produce a corresponding pattern of thermal bond areas over about 3% to 25% of the surface area of the combination, and, (e) drying the sonically bonded combination.
摘要:
This invention relates to polyether polyols having an average hydroxyl value in the range of 100 to 250 mgKOH/g, which are alkoxylated derivatives of a polyhydric alcohol being a mixture of compounds according to formula (I) or/and (II) ##STR1## wherein R.sup.1 is H, CH.sub.3 or OCH.sub.3,R.sup.2 is H, CH.sub.2 OH or CH.sub.2 C(CH.sub.2 OH).sub.3, andR.sup.3 and R.sup.4 areH, CH.sub.2 OH or CH.sub.2 OCH.sub.3.
摘要:
Certain oxaalkanoate zwitterionic surfactant-type compounds and their esters are not only excellent detergents, but also provide superior oral therapy for ulceration of the gastric mucosa. The oxaalkanoate zwitterionic compounds are especially preferred in the management of both gastric and duodenal ulcers.
摘要:
A mallet-style golf ball putter with a hollow pipe component that has generally the same diameter as a golf ball, is positioned about the sweet spot in the vertical and lateral dimensions on the putter striking face, and extends longitudinally towards the rear of the putter to assist the golfer to align the striking face of the putter with the golf ball when in an address position and with the intended line of putt during takeback and follow-through. Peripheral weighting further enhances the moment of inertia of the golf putter head. The pipe component so designed permits a visual alignment of the striking face with the golf ball in the lateral and vertical dimensions and for a smooth perpendicular stroke along an axis of the pipe.