US4396729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction injection molded elastomer containing an internal mold release made by a two-stream system
Assignee: Texaco Inc
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Filing: 1982-04-23
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Granted: 1983-08-02
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Expires: 2002-04-23
Abstract
Abstract The invention is a method of making a molded reaction injection molded elastomer which will release from its mold without the presence of externally applied mold release agents. The reaction injection molded (RIM) elastomer is 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 amine terminated polyethers of greater than 1,500 molecular weight, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate. The resulting RIM elastomer may be removed from the mold easily. RIM elastomers are useful, for example, for automobile body parts.
Inventors
- 👤 Richard J. G. Dominquez
- 👤 Doris M. Rice
- 👤 Rodney F. Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6685; B29K; B29K2075/00; C08G2120/00; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 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 strams 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 greater than about 1,500 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 2
Independent Claim
95 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 strams 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 greater than about 1,500 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 3
Dependent Claim
19 words
A method as in claim 1 wherein the amine terminated polyether has a functionality of about 2 to 6.
Claim 4
Dependent Claim
20 words
A method as in claim 2 wherein the functionality of the amine terminated polyethers is from about 2 to 3.
Claim 5
Dependent Claim
19 words
A method as in claim 1 wherein the amine terminated polyether has a molecular weight greater than about 2,500.
Claim 6
Dependent Claim
20 words
A method as in claim 1 where the internal mold release agent comprises a dimethyl siloxane with organic acid groups.
Claim 7
Dependent Claim
89 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 greater than about 1,500 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 8
Dependent Claim
89 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 greater than about 1,500 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 9
Dependent Claim
19 words
A method as in claim 6 wherein the amine terminated polyether has a functionality of about 2 to 6.
Claim 10
Dependent Claim
19 words
A method as in claim 7 wherein the amine terminated polyether has a functionality of about 2 to 3.
Claim 11
Dependent Claim
19 words
A method as in claim 6 wherein the amine terminated polyether has a molecular weight greater than about 2,500.
Claim 12
Dependent Claim
20 words
A method as in claim 6 wherein the internal mold release agent comprises a dimethyl siloxane with organic acid groups.
Claim 13
Independent Claim
91 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 of about 5,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 14
Independent Claim
91 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 of about 5,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 15
Dependent Claim
88 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 of about 5,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
Claim 16
Dependent Claim
88 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 of about 5,000 molecular weight having greater than 50% of their active hydrogens in the form of amine hydrogens, an amine terminated chain extender and an internal mold release agent, and in the second stream an aromatic polyisocyanate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |