US4774263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of elastic molded articles
Assignee: Bayer AG
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Filing: 1982-11-22
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Granted: 1988-09-27
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Expires: 2002-11-22
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 pjrimary 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 16:20
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: 19
Claim 1
Independent Claim
100 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 primary and/or secondary amine groups, (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups and (d) an internal mold release agent by a reaction injection molding technique.
Claim 2
Dependent Claim
100 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 primary and/or secondary amine groups, (c) a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups and (d) an internal mold release agent by a reaction injection molding technique.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the internal mold release agent is a salt of oleic acid or tall oil fatty acid.
Claim 4
Independent Claim
109 words
A method for making a reaction injection molded elastomer which will release from its mold without the presence of an externally applied mold release agent comprising injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers of from 1800 to 12,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 5
Independent Claim
109 words
A method for making a reaction injection molded elastomer which will release from its mold without the presence of an externally applied mold release agent comprising injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers of from 1800 to 12,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 6
Dependent Claim
20 words
A method as in claim 3 wherein the amine terminated polyether has a molecular weight of from 2000 to 8,000.
Claim 7
Dependent Claim
102 words
A RIM elastomer which will release from its mold without the presence of an externally applied mold release agent made by injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary terminated polyethers of from 1800 to 12,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 8
Dependent Claim
102 words
A RIM elastomer which will release from its mold without the presence of an externally applied mold release agent made by injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary terminated polyethers of from 1800 to 12,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 9
Dependent Claim
20 words
A method as in claim 5 wherein the amine terminated polyether has a molecular weight of from 2,000 to 8,000.
Claim 10
Independent Claim
110 words
A method for making a RIM elastomer which will release from its mold without the presence of an externally applied mold release agent comprising injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers having a molecular weight of from 1,800 to 12,000 and having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 11
Independent Claim
110 words
A method for making a RIM elastomer which will release from its mold without the presence of an externally applied mold release agent comprising injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers having a molecular weight of from 1,800 to 12,000 and having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 to 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 12
Dependent Claim
107 words
A RIM elastomer which will release from its mold without the presence of an externally applied mold release agent made by injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers having a molecular weight of from 1,800 to 12,000 and having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 and 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 13
Dependent Claim
107 words
A RIM elastomer which will release from its mold without the presence of an externally applied mold release agent made by injecting exactly two streams via a RIM machine into a mold cavity of the desired configuration, a formulation comprising in the first stream primary or secondary amine terminated polyethers having a molecular weight of from 1,800 to 12,000 and having greater than 50% of their active hydrogens in the form of amine hydrogens, a diamine having a molecular weight of from 108 and 400 and primary and/or secondary aromatically bound amino groups and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 14
Dependent Claim
17 words
A method as in claim 3 wherein the amine terminated polyether has a functionality of about 2-6.
Claim 15
Dependent Claim
17 words
A method as in claim 9 wherein the functionality of the amine terminated polyethers is about 2-3.
Claim 16
Dependent Claim
20 words
A method as in claim 3 where the internal mold release agent comprises a dimethyl siloxane with organic acid groups.
Claim 17
Dependent Claim
17 words
A method as in claim 5 wherein the amine terminated polyether has a functionality of about 2-6.
Claim 18
Dependent Claim
17 words
A method as in claim 12 wherein the amine terminated polyether has a functionality of about 2-3.
Claim 19
Dependent Claim
20 words
A method as in claim 5 where the internal mold release agent comprises a dimethyl siloxane with organic acid 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 |