Patent US5064875A successfully refreshed from Google Patents.
US5064875A
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Process for the preparation of heat-stable polyurethane urea elastomers
Assignee: Bayer AG
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Filing: 1990-11-30
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Granted: 1991-11-12
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Expires: 2010-11-30
Abstract
Abstract This invention relates to a process for preparing polyurethane urea elastomers by reacting (a) compounds containing at least two isocyanate-reactive groups and having a molecular weight in the range from about 400 to about 10,000; (b) polyisocyanates; and (c) aromatic diamines corresponding to the formula ##STR1## wherein R 1 and R 2 are independently hydrogen or alkyl.
Inventors
- 👤 Gerhard Grogler
- 👤 Urs Thiery
- 👤 Andreas Ruckes
- 👤 Richard Kopp
- 👤 Heinrich Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6529; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3225; C08G18/3237; C08G18/3243; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0033; C08G2120/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A process for the preparation of a polyurethane urea elastomer comprising reacting (a) a compound containing at least two isocyanate-reactive groups and having a molecular weight in the range from 400 to 10,000; (b) a polyisocyanate; and (c) an aromatic diamine corresponding to the formula ##STR6## wherein R 1 and R 2 are independently hydrogen or alkyl.
Claim 2
Dependent Claim
57 words
A process for the preparation of a polyurethane urea elastomer comprising reacting (a) a compound containing at least two isocyanate-reactive groups and having a molecular weight in the range from 400 to 10,000; (b) a polyisocyanate; and (c) an aromatic diamine corresponding to the formula ##STR6## wherein R 1 and R 2 are independently hydrogen or alkyl.
Claim 3
Dependent Claim
12 words
A process according to claim 1 additionally comprising (d) auxiliaries and additives.
Claim 4
Dependent Claim
22 words
A process according to claim 1 wherein compound (a) has a molecular weight in the range from about 400 to about 6,000.
Claim 5
Dependent Claim
21 words
A process according to claim 1 wherein R 1 and R 2 are independently hydrogen or C 1 -C 6 alkyl.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein R 1 and R 2 are independently hydrogen or methyl.
Claim 7
Dependent Claim
43 words
A process according to claim 1 wherein aromatic diamine (c) is used as a powder suspended in a portion of component (a) and wherein components (a), (b), and (c) are initially mixed at a temperature below the melting point of said aromatic diamine.
Claim 8
Dependent Claim
32 words
A process according to claim 1 wherein an NCO preadduct is initially prepared from components (a) and (b) and wherein aromatic diamine (c) is added as a powder to said NCO preadduct.
Claim 9
Dependent Claim
44 words
A process according to claim 1 wherein component (a) is a polyhydroxyl compound in which aromatic diamine (c) is only poorly soluble at temperatures below 100° C. but in which aromatic diamine (c) is substantially soluble at temperatures of from 130° to 200° C.
Claim 10
Dependent Claim
20 words
A process according to claim 1 wherein component (a) is a polyester having a molecular weight of 400 to 10,000.
Claim 11
Dependent Claim
17 words
A process according to claim 9 wherein the polyester has a molecular weight of 400 to 6,000.
Claim 12
Dependent Claim
16 words
A process according to claim 1 wherein aromatic diamine (c) is 1,4-bis(2-(4-aminophenoxy)ethoxy)benzene having the formula ##STR7##
Claim 13
Dependent Claim
24 words
A process according to claim 1 wherein aromatic diamine (c) is used as a powder having a particle size of 1 to 100 μm.
Claim 14
Dependent Claim
24 words
A process according to claim 1 wherein aromatic diamine (c) is used as a powder having a particle size of 1 to 50 μm.
Claim 15
Dependent Claim
46 words
A process according to claim 1 wherein a suspension is formed by mixing aromatic diamine (c) in powder form with a portion of component (a) in quantities such that the ratio by weight of said aromatic diamine (c) to component (a) is from 1.0.5 to 5:1.
Claim 16
Dependent Claim
23 words
A process according to claim 14 wherein the ratio by weight of aromatic diamine (c) to component (a) is from 1.0:1.0 to 2.0.
Claim 17
Dependent Claim
25 words
A process according to claim 14 wherein the suspension is added as a chain-extending agent to polyisocyanate (b) and the remaining portion of component (a).
Claim 18
Dependent Claim
37 words
A process according to claim 14 wherein the suspension is mixed with polyisocyanate (b) in quantities such that 0.05 to 20% NH 2 equivalents of aromatic diamine (c) react in an initial reaction with said polyisocyanate (b).
Claim 19
Dependent Claim
64 words
A heterogeneous mixture comprising a mixture of (A) an NCO-terminated preadduct, wherein said preadduct is prepared by reacting (a) a compound containing at least two isocyanate-reactive groups and having a molecular weight in the range from 400 to 10,000 and (b) a polyisocyanate, and (B) an aromatic diamine corresponding to the formula ##STR8## wherein R 1 and R 2 are independently hydrogen or alkyl.
Claim 20
Dependent Claim
64 words
A heterogeneous mixture comprising a mixture of (A) an NCO-terminated preadduct, wherein said preadduct is prepared by reacting (a) a compound containing at least two isocyanate-reactive groups and having a molecular weight in the range from 400 to 10,000 and (b) a polyisocyanate, and (B) an aromatic diamine corresponding to the formula ##STR8## wherein R 1 and R 2 are independently hydrogen or alkyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |