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公开(公告)号：DE19835703C1
公开(公告)日：1999-05-20
申请号：DE19835703
申请日：1998-08-07
Applicant: BAYER AG
Inventor： KOPP RICHARD DR , BARNES MICHAEL , RUPRECHT HANS-DIETER DR , WUSSOW HANS-GEORG DR
IPC: C07D251/32 , C07D251/34 , C08G18/79 , C08K5/21 , C08K5/3492 , C08L101/00
Abstract: A N,N'-disubstituted N-(2-hydroxyalkyl) urea is prepared from hexamethylene diisocyanate trimer having a reduced free isocyanate group content and is non-crystalline. A non-crystalline N,N'-disubstituted N-(2-hydroxyalkyl) urea (I) is of formula (1) (1) R = a residue of a trimerised hexamethylene diisocyanate having a reduced free NCO group content; R = an aliphatic or aromatic hydrocarbon having up to 18C atoms, optionally substituted by hydroxyl, cyano or halogen; R = 1-12 alkyl n = 3.0-5.0 on average.
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Patent Agency Ranking
公开(公告)号：DE4236939A1
公开(公告)日：1994-05-05
申请号：DE4236939
申请日：1992-11-02
Applicant: BAYER AG
Inventor： RUCKES ANDREAS DR , GROEGLER GERHARD DR , KOPP RICHARD DR , HES HEINRICH DR , BARNES MICHAEL
IPC: C08K3/24 , C08G18/08 , C08G18/10 , C08G18/42 , C08G18/44 , C08G18/65 , C08K5/09 , C08L75/00 , C09K3/10 , D06N3/14 , C07C275/40 , C08G18/38
Abstract: The invention concerns a method of manufacturing polyurethane/urea elastomers, in which the reaction products, which contain terminal NCO groups, of polyester and/or polycarbonate polyols with a molecular weight of 400 to 10,000 and polyisocyanates are reacted with finely divided diaminodiphenyl ureas of the general formula (I), in which the NH2 groups are in the meta position relative to the urea grouping and R , R , R and R , which may be the same or different, are H or C1-C6 alkyl groups, organic and/or inorganic acid chlorides in concentrations greater than 20 ppm relative to the NCO adduct used being added to one or both components before they are mixed in order to stabilize the reaction mixture.
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公开(公告)号：DE3200412A1
公开(公告)日：1983-07-21
申请号：DE3200412
申请日：1982-01-09
Applicant: BAYER AG
Inventor： GANSTER OTTO DR CHEM , BARNES MICHAEL
Abstract: This invention relates to a process for the production of polyurethane urea products from isocyanate product blends and preferably less reactive, aromatic diamines, or solutions of aromatic diamines in relatively high molecular weight polyhydroxyl compounds, the reaction components being reacted in a casting process with commercially-reasonable casting times and comparatively short demolding times. For this purpose, relatively high-molecular weight polyhydroxyl compounds, optionally in the presence of low molecular weight diols are reacted with excess quantities of toluene, phenylene or hexamethylene diisocyanate to produce a substantially diisocyanate-free NCO-prepolymer. This NCO-prepolymer is mixed with from 0.1 to 25%, by weight, of less reactive, monomeric tetra-alkyl-diphenylmethane diisocyanates corresponding to the general formula: wherein R1 to R4, which may be the same or different, represent C1-C4 alkyl radicals. These isocyanate blends may be easily processed into elastomer moldings having favorable properties in the casting process using moderately-reactive aromatic diamines from the series of di- to tetra-alkyl-diphenylmethane diamines and/or dialkyl-toluene diamines and/or using substituted 3,5-diamino-4-alkyl-benzoic acid alkyl esters, optionally dissolved in the relatively high molecular weight polyhydroxyl compounds.
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公开(公告)号：CA2146670A1
公开(公告)日：1994-05-11
申请号：CA2146670
申请日：1993-10-20
Applicant: BAYER AG
Inventor： RUCKES ANDREAS , GROEGLER GERHARD , KOPP RICHARD , BARNES MICHAEL , HEBETA HEINRICH
IPC: C08K3/24 , C08G18/08 , C08G18/10 , C08G18/42 , C08G18/44 , C08G18/65 , C08K5/09 , C08L75/00 , C09K3/10 , D06N3/14 , C08G18/66
Abstract: A method of preparing polyurethane urea elastomers by reacting polyisocyanates and polyester and/or polycarbonate polyol reaction products containing terminal NCO groups and having a molecular weight of 400 to 10,000 with finely divided diamino diphenyl ureas having the general formula in which the NH2 groups are in the meta position relative to the urea group and R1, R2, R3, R4 (which may be the same or different) denote H or C1 - C6-alkyl radicals, in which organic and/or inorganic acid chlorides in a proportion greater than 200 ppm relative to the NCO pre-adduct are added in order to stabilise the reactive mixture of one or both components before premixing.
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