Polyurethane Foam Material Free of Halogenated Hydrocarbons and Process for Producing the Same
Abstract not available for CA2031218 Abstract of corresponding document: US5182309 PCT No. PCT/EP90/00581 Sec. 371 Date Dec. 21, 1990 Sec. 102(e) Date Dec. 21, 1990 PCT Filed Apr. 12, 1990 PCT Pub. No. WO90/12841 PCT Pub. Date Nov. 1, 1990.The present invention is related to polyurethane foam materials, pores thereof being free of halogenated hydrocarbon compounds, in particular free of CFCs, and a process for producing the same wherein no halogenated hydrocarbon, in particular no CFC is used as foaming agent. The pores of the polyurethane foam material contain minor amounts of the vaporized foaming agent used in the process of the invention, i.e. of the organic liquid product selected from the group consisting of a lower alkane having 3 to 6 carbon atoms or a mixture of such lower alkanes, said liquid foaming agent having a boiling point between -10 DEG and =70 DEG C. at normal pressure. In the process of the present invention said foaming agent is either finely dispersed in the mixture of the alcoholic starting component and the isocyanate starting component or said foaming agent is first emulsified in the alcoholic starting component, if necessary with the aid of an emulsifying agent, and the isocyanate component thereafter is added to this emulsion, and then the exothermic polymerization reation of the starting components is effected. Possibly, the so produced polyurethane foam material is stored for several hours or days. |
POLYURETHANE-AMIDE ADHESIVE USING GLYCEROL AND FATTY ACID
Abstract not available for AU2003302914 Abstract of corresponding document: WO2004053012 The present invention relates to polyurethane-amide adhesives using glycerol and fatty acid, and more particularly to adhesives produced by reacting polymethylenebisphenylisocyanate with the fatty acid and glycerol obtained from vegetable oil, edible oil or waste edible oil. According to the present invention, the adhesives for the commercially available industrial materials can be produced from the polymethylenebisphenylisocyanate (PMDI) as a raw material of urethane-based adhesives, and the fatty acid and glycerol obtainable from vegetable oils, so that these adhesives can be used as an environment-friendly thermosetting material. The inventive adhesives thus obtained are widely used as wood adhesives, industrial adhesives, or adhesives for electric/electronic materials, or for the production of urethane foams. |
Polyurethanes
A process for the preparation of polyurethanes comprises reacting (a) an organic diisocyanate with (b) an hydroxyl polyester of acid number below 10 and hydroxyl number below 224 and prepared by condensing a dicarboxylic acid having at least 3C with a glycol containing at least one secondary hydroxyl group in the molecule or a mixture of glycols, at least one of which contains at least one secondary hydroxyl group in the molecule and a polyhydric alcohol having the formula R(OH)n where R represents an organic radical after the removal of the hydroxyl groups from a polyhydric alcohol and n is 3, 4 or 5 wherein, when n is 3, the polyhydric alcohol is used in an amount from 0.003 to 0.75 mol. per equivalent of secondary hydroxyl groups, when n is 4, the polyhydric alcohol is used in an amount from 0.0015 to 0.0375 mol. per equivalent of secondary hydroxyl groups and when n is 5, the polyhydric alcohol is used in an amount from 0.001 to 0.025 mol. per equivalent of secondary hydroxyl groups, and (c) a difunctional chain-extending agent of MW less than 500 and containing hydroxyl and/or amino groups; the diisocyanate being employed in amount to provide an -NCO to OH ratio of greater than 1. Chain-extending agents may be: dihydric alcohols, hydrazines, hydrazides, diamines and amino alcohols. Many suitable alcohols and acids for the preparation of the polyester are listed. Isocyanates listed include aliphatic, cycloaliphatic, aromatic and sulphur and halogen containing isocyanates. In a typical Example (1) a polyester derived from adipic acid, propylene glycol, ethylene glycol and trimethylolpropane was mixed with 1, 4-butanediol and 4, 41-diphenyl methane diisocyanate added. |
POLYURETHANE-FORMING COMPOSITION USEFUL FOR BACKING TEXTILES AND A PROCESS FOR PREPARING POLYURETHANE-BACKED TEXTILES
This invention is a polyurethane-forming composition useful for backing textiles which comprises: (A) a first polyol which comprises a relatively high equivalent weight polyol containing an average of from 1.4 to 1.95 hydroxyl groups per molecule, of which at least 30 percent of the hydroxyl groups are primary hydroxyls or a mixture thereof with at least one additional relatively high equivalent weight polyol containing at least 2.05 hydroxyl groups per molecule, of which at least 30 percent of the hydroxyl groups are primary hydroxyls; (B) a relatively low equivalent weight compound having about 2 active hydrogen containing moieties per molecule; 34, 515-F (C) a polyisocyanate and (D) a catalytic amount of a catalyst for the reaction of a polyol and a polyisocyanate, wherein the functionalities and proportions of components (A), (B), and (C) are such that the average functionality of the components together is from 1.97 to 2.03, and the composition has an isocyanate index of from 85 to 125. This invention is also a process for preparing a polyurethane-backed textile by coating the textile on one side with the above-described polyurethane-forming composition at a coating weight of from 1 to 300 ounces per square yard (0.03 to 10.2 kg/m2) and then heating the coated textile to a temperature of from 50 to 150.degree.C until the polyurethane-forming composition is cured to a tack-free state. 34, 515-F |
POLYURETHANE PRODUCTS PRODUCED FROM ALUMINUM PHOSPHONATE CATALYZED POLYETHEROLS
Abstract not available for AU2002366718 Abstract of corresponding document: US2003134921 A method for the production of polyurethane products using very low unsaturation polyether polyols prepared in the presence of aluminum phosphonate catalysts is disclosed. Reaction products of the process include various polyurethane products including foams, coatings, adhesives, sealants and elastomers. The aluminum phosphonate catalyst preferably has a general structure of RPO-(OAlR'R'')2, wherein O represents oxygen, P represents pentavalent phosphorous, Al represents aluminum, R comprises a hydrogen, an alkyl group, or an aryl group, and R' and R'' independently comprise a halide, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group. |
POLYURETHANES PRODUCED FROM DIAMINODIPHENYL- DITHIOETHERS
POLYURETHANES PRODUCED FROM DIAMINODIPHENYL-DITHIOETHERS This invention relates to polyurethane elastomers produced using optionally substituted diaminodiphenyl-dithio-ethers as chain extenders. More particularly, this invention relates to certain polyurethane elastomers and a process for making such elastomers. The process broadly comprises reacting polyisocyanates with active hydrogen containing compounds with certain novel chain extenders of the general formula: wherein R' and R", which may be the same or different, each represent hydrogen, an alkyl radical having from 1 to 6 carbon atoms, an aryl radical having from 6 to 15 carbon atoms, a cycloalkyl radical having from 4 to 12 carbon atoms, halogen, -NO2, -CN, OR''' or the radical wherein R''' represents an optionally branched alkyl radical having from 1 to 6 carbon atoms; and R represents a straight- or branched-chain aliphatic radical having from 1 to 25 carbon atoms which are interrupted by from 1 to 12 atoms of nitrogen and/or oxygen and/or sulphur in the form of secondary or tertiary amino groups, urea or acid amide groups, ether, urethane or ester groups, thioether, thiourethane or thioester groups or from 1 to 4 carbonyl groups. |
POLYURETHANES CONTAINING ACRYLOYL GROUPS, A PROCESS FOR THEIR PREPARATION AND THEIR USE AS BINDERS FOR COATING COMPOSITIONS
POLYURETHANES CONTAINING ACRYLOYL GROUPS, A PROCESS FOR THEIR PREPARATION AND THEIR USE AS BINDERS FOR COATING COMPOSITIONS The present invention relates to polyurethanes which contain acryloyl groups, have a viscosity at 23.degree.C of 800 to 100, 000 mPa.s, and are prepared by reacting at an NCO/OH equivalent ratio of 0.7:1 to 1:1, I) an organic isocyanate component containing a) 20 to 50 mole % of one or more organic diisocyanates, other than hexamethylene diisocyanate, which have aliphatically and/or cycloaliphatically bound isocyanate groups and a molecular weight of less than 300 and b) 50 to 80 mole % of hexamethylene diisocyanate with II) a hydroxyl component containing c) 43 to 93 hydroxyl equivalent % of an alcohol component which has an average hydroxyl functionality of 0.8 to 1.5 and contains one or more alcohols having acryloyl groups and a molecular weight of 116 to 1000, provided that at least 50 mole % of component c) is made up of ether group-containing esterification products of acrylic acid with ether group-containing alcohols which are at least trihydric, wherein the esterification products have an average molecular weight of 300 to 1000 and an average hydroxyl functionality of 0.8 to 1.5, d) 7 to 50 hydroxyl equivalent % of one or more monohydric or dihydric branched alcohols having a molecular weight of 130 to 300 and e) 0 to 50 hydroxyl equivalent % of one or more monohydric or polyhydric alcohols having a molecular weight of less than 130. The present invention also relates to a method of preparing these polyurethanes and to their use as binders for coating compositions, particularly for those which can be hardened by high-energy radiation. |
POLYURETHANE ELASTOMER ADHESIVELY CONNECTED TO POLYTETRAFLUORETHYLENE AND AN ELASTIC BEARING CONTAINING ONE SUCH POLYURETHANE ELASTOMER
Abstract not available for AU2003242617 Abstract of corresponding document: DE10225793 Polyurethane elastomer adhesively bonded with polytetrafluoroethylene by means of a reactive melt adhesive is new Independent claims are included for: (1) a method for preparation of the polyurethane (PU) elastomer involving application of ground reactive adhesive melt (GRAM) based on encapsulated isocyanates to the elastomer surface to be bonded and/or to the surface of a polytetrafluoroethylene (PTFE) film, melting of the GRAM at 30-90degreesC, fixing of this to the part to be bonded, activation of the GRAM by heating to a temperature exceeding 100degreesC, and by reaction of the GRAM the PTFE is bonded to the Polyurethane elastomer; (2) an elastic support containing the PU elastomer; (3) an automobile or freight vehicle containing the elastic support. |
POLYURETHANE FOAM AND ITS PRODUCTION
A polyurethane foam produced by the reaction of a polyisocyanate and a polyether polyol in the presence of a catalyst, a cell regulating agent and water as a blowing agent, the polyether polyol of which consists of a halogenated polyether polyol (I) of the general formula: < IMG > wherein x is a number of 0 to 7; y is a number of 2 to 3; A is a saturated or unsaturated, brominated polyol residue having a number of functional groups of y; R is hydrogen or an alkyl group having 1 to 5 carbon atoms! and (II) a polyether polyol having a number of functional groups of 2 to 8, a weight ratio of the added amounts of propylene oxide and ethylene oxide within the range of about 75 to 95/25 to 5 and a hydroxyl number of about 20 to 100 mgKOH/g, whereby a weight ratio of (I) to (II) is about 95 to 25/5 to 75 and the amount of water is about 5 to 20 parts by weight against 100 parts by weight of the polyol component. The polyurethane foam has uniform and open calls and shows excellent physical properties in compressive strength, tensile strength, excellent sound absorption characteristics and flame resistance, and is therefore used as thermal insulation materials, acoustic absorption materials and shock absorption materials for houses, vehicles, etc. |
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