摘要:
Method for preparation of fluorochlorohydrocarbon-free (FCHC-free) low-density polyurethane soft-foam materials and soft-elastic polyurethane soft-foam materials as well as polyisocyanate mixtures modified with urethane groups, and based on diphenylmethane-diisocyanate, which are applicable thereto.
摘要:
The invention provides a method for the preparation of fluorochlorohydrocarbon(FCHC)-free polyurethane soft (molded) foam materials with low density, by reactingA) liquid polyisocyanate mixtures containing bound urethane groups, containing 22 to 30 weight percent of NCO groups, which in turn are prepared by reacting a mixture of diphenylmethane-diisocyanate and polyphenyl-polymethylene-polyisocyanates (raw MDI) with at least one polyoxypropylene-polyoxyethylene-polyol with a functionality between 2.5 and 3.5, a hydroxyl number between 50 and 90 and a polymerized ethylene oxide group concentration ranging from more than 30 to less than 50 weight percent, relative to the weight of the polymerized ethylene oxide and 1,2 propylene oxide groups, or by reacting of 4,4'diphenylmethane-diisocyanate (MDI) or and MDI-isomeric mixture with the above-named polyoxypropylene-polyoxyethylene-polyol to an NCO-group-containing quasi-prepolymer, and diluting this quasi-prepolymer with raw-MDI, withB) higher-molecular polyhydroxyl compounds and, if appropriateC) low-molecular chain lengthening and/or cross-linkage-promoting materialsD) propellants,E) catalysts as well as if appropriate,F) auxiliary materials and/or additives, as well as the polyisocyanate mixtures modified with urethane groups (A) which are utilizable in accordance with the process of the invention.
摘要:
The invention relates to a process for the production of (flexible) polyurethane foams having reduced odor and reduced fogging values by reacting a) modified or unmodified organic polyisocyanates with b) relatively high-molecular-weight polyhydroxyl compounds and, if desired,c) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of d) blowing agents, e) catalysts from the group consisting of aminoalkyl- and aminophenylimidazoles of the formula ##STR1## and, if desired, f) additives, and to the use of the aminoalkyl- and aminophenylimidazoles of the formula (I) and/or (II) as catalysts for the preparation of polyisocyanate polyaddition products.
摘要:
The present invention relates to a process for the preparation of flexible, soft polyurethane foams having viscoelastic, structure-borne soundproofing properties in a temperature range of from -20.degree. C. to +80.degree. C. by reactinga) a polyoxyalkylene-polyol mixture containingai) block polyoxypropylene-polyoxyethylene-polyol mixture having a hydroxyl number of from 14 to 65 and containing from 2 to 9% by weight of terminal ethylene oxide units, based on the weight of the polyoxypropylene units, prepared by anionic polymerization, at elevated temperatures, of 1,2-propyleneoxide onto an initiator molecule mixture having a mean functionality of from 2.3 to 2.8, comprising water and glycerol and/or trimethylolpropane, and polymerization of acylene oxide onto the resultant polyoxypropylene adduct, andaii) one or more difunctional and/or trifunctional polyoxypropylene-polyoxyethylene-polyol containing from 60 to 85% by weight of oxyethylene units, based on the total weight of polymerized alkylene oxide units, and having a hydroxyl number of from 20 to 80, andb) if desired low-molecular-weight chain extenders withc) organic and/or modified organic polyisocyanates in the presence ofd) catalysts,e) blowing agents, preferably water, and, if desired,f) auxiliaries and/or additives,and to the polyoxyalkylene-polyol mixtures (a) which can be used for this purpose.
摘要:
Flexible polyurethane foams having low compressive strength and relatively good tensile strength are prepared by reactinga) a block polyoxypropylenepolyoxyethylenepolyol mixture which has a hydroxyl number of from 14 to 65, contains from 2 to 9% by weight, based on the weight of the polyoxypropylene units, of ethylene oxide units bonded in the terminal position and is prepared by anionic polymerization of the alkylene oxides with an initiator mixture having an average functionality of from 2.3 to 2.8 and consisting of water and glycerol and/or trimethylolpropane, or a mixture of these block polyoxypropylenepolyoxyethylenepolyol mixtures with bi- and/or trifunctional polyoxypropylenepolyoxyethylenepolyols having a hydroxyl number of from 20 to 70, andb) if required, low molecular weight chain extenders withc) organic and/or modified organic polyisocyanates in the presence ofd) catalysts,e) blowing agents, preferably water, and if required,f) assistants and/or additives.
摘要:
This invention deals with novel copolymers having K values of from 5 to 80 prepared by the radical polymerization of:(A) 20 to 80 weight percent, based on the total weight of (A) and (B), of at least one olefinic unsaturated polyoxyalkylene alcohol adduct or a polyester alcohol adduct;(B) 80 to 20 weight percent, based on the total weight of (A) and (B), of at least one vinyl monomer selected from the group consisting of N-vinylformamide, N-vinyl-2-pyrrolidone, N-vinyl-piperidone, N-vinyl-2-caprolactam, N-vinylimidazole, N-vinyl-2-ethylene-urea and N-vinyl-2-propylene-urea;(C) 0.05 to 40 parts by weight of glycidyl acrylate and/or glycidyl methacrylate;(D) 0 to 10 parts by weight of at least one .alpha.,.beta.-monoolefinic unsaturated acid; and(E) 0 to 30 parts by weight of at least one olefinic unsaturated carboxylic acid amide and or carboxylic acid ester and/or styrene;whereby the parts by weight of (C), (D) and (E) are each based on 100 parts by weight of monomers (A) and (B).The copolymers are used as auxiliaries and/or additives, for example, as dispersing agents and/or emulsification agents or as additives for improving the mechanical properties in formulations for the preparation of polyisocyanate addition polymerization products.
摘要:
The invention relates to highly reactive polyoxyalkylene-polyols prepared by oxyalkylation of an initiator molecule containing, in bonded form, at least 2 reactive hydrogen atoms and at least one tertiary amino group bonded via a spacer bridge, which preferably comprises an alkylene radical having at least 3 carbon atoms, by means of at least one alkylene oxide, preferably ethylene oxide and/or 1,2-propylene oxide, to a process for the preparation of these polyoxyalkylene-polyols, and to their use for the production of compact or cellular, preferably flexible polyisocyanate polyaddition products.
摘要:
The present invention relates to a process for the preparation of a hard foam containing urethane groups or urethane and isocyanurate groups by the polyisocyanate polyaddition process, by reactinga) a polyoxypropylene- or polyoxyethylene-polyoxypropylene-polyol containing secondary hydroxyl groups, having a functionality of from 3.5 to 4.3, a hydroxyl number of from 350 to 650 and a viscosity of from 500 to 2,500 mPa.multidot.s at 23.degree. C. and prepared by anionic polymerization of 1,2-propylene oxide or ethylene oxide and 1,2-propylene oxide onto an initiator molecule mixture containing, based on the total weight,a1) from 40 to 80% by weight of a hexanetetrol,a2) from 1 to 30% by weight of a hexanetriol,a3) from 0 to 35% by weight of glycerol anda4) from 0 to 15% by weight of sorbitol or mannitol, or a mixture thereof,b) optionally, a low-molecular-weight chain extender and/or crosslinking agent withc) an organic, modified or unmodified polyisocyanate; in the presence ofd) a blowing agent,e) a catalyst and, optionally,f) assistants and/or additives, and novel polyoxypropylene-polyols and polyoxyethylene-polyoxypropylene-polyols which can be used for this purpose.
摘要:
An apparatus for making smoking articles is described. The preferred apparatus comprises structure to form a passage axially through a jacketed rod of tobacco, at one end of which there is a tubular sleeve of non-combustible material, and to insert an aerosol generating cartridge containing an aerosol forming substance, at one end of which there is a fuel element, into the passage so that the aerosol forming substance is within the passage in the rod of tobacco and the fuel element is within the sleeve of non-combustible material.
摘要:
Filter cigarettes which are transported sideways at the periphery of a rotating drum-shaped conveyor are engaged by successive rolling surfaces of a pair of coaxial rotary rolling members which rotate at the peripheral speed of the conveyor but in the opposite direction so that the cigarettes are caused to roll about their respective axes and cease to advance with the conveyor. The periphery of the conveyor is formed with flutes which receive the freshly rolled cigarettes, and the rolling of cigarettes is abruptly terminated by arresting members which orbit adjacent the path of movement of the cigarettes at the peripheral speed of the conveyor and in the same direction. A laser is used to make holes in successive cigarettes while the cigarettes roll about their respective axes.