US4774264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of elastic molded articles
Assignee: Bayer AG
•
Filing: 1986-04-18
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Granted: 1988-09-27
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Expires: 2006-04-18
Abstract
Abstract Elastic molded articles having a closed surface layer are made from polyurea elastomers by the reaction injection molding technique. These polyurea elastomers are prepared from a polyisocyanate in which all of the isocyanate groups are aromatically bound, a polyether and a diamine. The polyether has at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000. At least 50% of the isocyanate-reactive groups in the polyether are primary and/or secondary amino groups. The diamine has a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups. Known auxiliary agents and additives may also be employed.
Inventors
- 👤 Christian Weber
- 👤 Hans Wirtz
- 👤 Klaus Seel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6685; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G2110/00; C08G2110/0033; C08G2110/0041; C08G2110/0066; C08G2120/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
A process for the production of elastic molded articles having a closed surface layer by reacting as a one-shot system a mixture comprising (a) a diisocyanate and/or polyisocyanate in which the isocyanate groups are aromatically bound, (b) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups by a reaction injection molding technique.
Claim 2
Dependent Claim
97 words
A process for the production of elastic molded articles having a closed surface layer by reacting as a one-shot system a mixture comprising (a) a diisocyanate and/or polyisocyanate in which the isocyanate groups are aromatically bound, (b) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups by a reaction injection molding technique.
Claim 3
Dependent Claim
30 words
The process of claim 1 in which component (b) is a polyether in which at least 80% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which (d) an organometallic catalyst is employed.
Claim 5
Dependent Claim
15 words
The process of claim 1 in which (e) an internal mold release agent is employed.
Claim 6
Dependent Claim
23 words
The process of claim 4 in which the internal mold release agent is a salt of oleic acid or tall oil fatty acid.
Claim 7
Dependent Claim
24 words
The process of claim 1 in which a first stream composed of (a) is reacted with a second stream composed of (b) and (c).
Claim 8
Dependent Claim
25 words
The process of claim 3 in which a first stream composed of (a) is reacted with a second stream composed of (b), (c) and (d).
Claim 9
Dependent Claim
25 words
The process of claim 4 in which a first stream composed of (a) is reacted with a second stream composed of (b), (c), and (e).
Claim 10
Dependent Claim
23 words
The process of claim 1 in which (b) is the amino polyether formed by hydrolyzing a reaction product of a polyether with 2,4-diisocyanatotoluene.
Claim 11
Dependent Claim
86 words
A reaction injection molded elastomer made by reacting in a closed mold: (a) a diisocyanate and/or polyisocyanate in which the isocyanate groups are aromatically bound, (b) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups by a reaction injection molding technique.
Claim 12
Dependent Claim
86 words
A reaction injection molded elastomer made by reacting in a closed mold: (a) a diisocyanate and/or polyisocyanate in which the isocyanate groups are aromatically bound, (b) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups by a reaction injection molding technique.
Claim 13
Dependent Claim
21 words
The elastomer of claim 10 in which (b) contains at least 80% aromatically bound primary and/or secondary aromatically bound amino groups.
Claim 14
Dependent Claim
16 words
The elastomer of claim 10 in which the reactants include (d) an internal mold release agent.
Claim 15
Dependent Claim
73 words
A composition of matter useful in the production of an elastomer by a reaction injection molding technique comprising: (a) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (b) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups.
Claim 16
Dependent Claim
73 words
A composition of matter useful in the production of an elastomer by a reaction injection molding technique comprising: (a) a polyether having at least two isocyanate-reactive groups and a molecular weight from 1800 to 12,000 in which at least 50% of the isocyanate reactive groups are aromatically bound primary and/or secondary amino groups, and (b) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups.
Claim 17
Dependent Claim
14 words
The composition of claim 13 which further comprises (c) an internal mold release agent.
Claim 18
Dependent Claim
22 words
The composition of claim 13 in which at least 80% of the isocyanate-reactive groups are aromatically bound primary and/or secondary amino groups.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |