Patent US4587275A successfully refreshed from Google Patents.
US4587275A
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Process for the preparation of polyurethane elastomers
Assignee: Bayer AG
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Filing: 1982-09-30
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Granted: 1986-05-06
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Expires: 2002-09-30
Abstract
Abstract Polyurethane urea elastomers are produced by reacting polyisocyanates with compounds containing at least two isocyanate reactive hydrogen atoms having a molecular weight of 400 to 10,000 and mononuclear or dinuclear aromatic diamines. The aromatic diamines must have at least one sulfonamide group as a substituent on at least one of their aromatic rings. Known chain lengthening agents, activators, blowing agents, auxiliary agents and additives may also be included in the reaction mixture. Polyurethane elastomers produced by this process have excellent mechanical properties. In particular, such elastomers are soft yet have high tear propagation resistance.
Inventors
- 👤 Richard Kopp
- 👤 Holger Meyborg
- 👤 Gerhard Grogler
- 👤 Jurgen Schwindt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G18/3857; C08G18/3861; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
134 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) an aromatic diamine corresponding to the formula ##STR8## in which R 3 and R 4 (which may be the same or different) represent hydrogen, a straight or branched chain alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or a halogen atom; and R 5 , R 6 and A together represent a piperazine ring in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed.
Claim 2
Dependent Claim
134 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) an aromatic diamine corresponding to the formula ##STR8## in which R 3 and R 4 (which may be the same or different) represent hydrogen, a straight or branched chain alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or a halogen atom; and R 5 , R 6 and A together represent a piperazine ring in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed.
Claim 3
Dependent Claim
25 words
The process of claim 1 in which the materials reacted further include an isocyanate reactive compound having a molecular weight of from 32 to 400.
Claim 4
Dependent Claim
30 words
The process of claim 1 in which the materials reacted further include a compound taken from the group consisting of activators, blowing agents, auxiliary agents and additives, and mixtures thereof.
Claim 5
Dependent Claim
28 words
The process of claim 1 in which the aromatic diamine (c) is added in the liquid or molten state to an isocyanate prepolymer of components (a) and (b).
Claim 6
Dependent Claim
28 words
The process of claim 1 in which the aromatic diamine (c) is in the liquid or molten state and together with component (b) is added to component (a).
Claim 7
Dependent Claim
129 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) an aromatic diamine corresponding to the formula ##STR9## in which R 1 and R 2 (which may be the same or different) represent hydrogen, a straight or branched chain alkyl group having from 1 to 20 carbon atoms, or an aryl or aralkyl group having from 6 to 20 carbon atoms and R 3 represents chlorine or a methyl group in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed.
Claim 8
Dependent Claim
129 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) an aromatic diamine corresponding to the formula ##STR9## in which R 1 and R 2 (which may be the same or different) represent hydrogen, a straight or branched chain alkyl group having from 1 to 20 carbon atoms, or an aryl or aralkyl group having from 6 to 20 carbon atoms and R 3 represents chlorine or a methyl group in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed.
Claim 9
Dependent Claim
25 words
The process of claim 6 in which the materials reacted further include an isocyanate reactive compound having a molecular weight of from 32 to 400.
Claim 10
Dependent Claim
30 words
The process of claim 6 in which the materials reacted further include a compound taken from the group consisting of activators, blowing agents, auxiliary agents and additives, and mixtures thereof.
Claim 11
Dependent Claim
28 words
The process of claim 6 in which the aromatic diamine (c) is added in the liquid or molten state to an isocyanate prepolymer of components (a) and (b).
Claim 12
Dependent Claim
28 words
The process of claim 6 in which the aromatic diamine (c) is in the liquid or molten state and together with component (b) is added to component (a).
Claim 13
Dependent Claim
202 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) a mononuclear or dinuclear aromatic diamine in which at least one sulfonamide group is a substituent on at least one aromatic ring wherein the group of compounds which may be used as component (c) does not include compounds represented by the formula ##STR10## in which X represents ##STR11## R and R' (which may be the same or different) represent straight or branched chain aliphatic groups having from 1 to 4 carbon atoms, and R" and R'" (which may be the same or different) represent hydrogen, an alkyl, an alkoxy or an alkylmercapto group having from 1 to 4 carbon atoms in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed and in which the polyisocyanate (a) is reacted in a heterogeneous phase with a suspension of the diamine (c) in component (b) at temperatures above or below the melting point of diamine (c).
Claim 14
Dependent Claim
202 words
A process for the production of a polyurethane urea elastomer by reacting (a) a polyisocyanate, (b) a compound containing at least two isocyanate reactive hydrogen atoms and having a molecular weight of from 400 to 10,000, and (c) a mononuclear or dinuclear aromatic diamine in which at least one sulfonamide group is a substituent on at least one aromatic ring wherein the group of compounds which may be used as component (c) does not include compounds represented by the formula ##STR10## in which X represents ##STR11## R and R' (which may be the same or different) represent straight or branched chain aliphatic groups having from 1 to 4 carbon atoms, and R" and R'" (which may be the same or different) represent hydrogen, an alkyl, an alkoxy or an alkylmercapto group having from 1 to 4 carbon atoms in which the diamine (c) is used in a quantity such that the diamine (c) represents a mole fraction within the range of 1 to 0.5 of chain lengthening agent employed and in which the polyisocyanate (a) is reacted in a heterogeneous phase with a suspension of the diamine (c) in component (b) at temperatures above or below the melting point of diamine (c).
Claim 15
Dependent Claim
29 words
The process of claim 11 in which the diamine (c) is suspended in component (b) and an isocyanate reactive compound having a molecular weight of from 32 to 400.
Claim 16
Dependent Claim
24 words
The process of claim 11 in which the aromatic diamine is a powder having an average particle size of from 1 to 50 μm.
References Cited (Backward Citations)
US3004939A
Cited
BE671062A
Cited
US3401151A
Cited
JPS4919570A
Cited
US3891606A
Cited
US3926922A
Cited
DE2635400A1
Cited
EP0017905A1
Cited
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