US4549007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamine/diol chain extender blends for rim process
Assignee: GAF Corp
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Filing: 1984-11-16
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Granted: 1985-10-22
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Expires: 2004-11-16
Abstract
Abstract A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula ##STR1## wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO 2 , acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the invention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.
Inventors
- 👤 I. Sioun Lin
- 👤 Stanley J. Gromelski, Jr.
- 👤 Jesse Werner
- 👤 Michael J. Brown
- 👤 Paritosh M. Chakrabarti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3814; C08G18/32; C08G18/3819; C08G18/3821; C08G18/3838; C08G18/384; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6529
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
223 words
In a process for the production of polyurethane-polyurea elastomer moldings from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the components: (a) an isocyanate reactant; (b) a polyol reactant having molecular weight of from 400 to 12,000; (c) a chain extender; and (d) a catalyst; the improvement wherein said chain extender is a normally liquid blend of butanediol and a mono-substituted toluene diamine having the formula ##STR4## wherein X is vicinal to an amino radical and is an electron-withdrawing substituent selected from the group of halo, CN, NO 2 , acyl and carboxylate and wherein the alkyl moieties of said acyl and carboxylate groups contain 1 to 6 carbon atoms, and isomeric mixtures of said mono-substituted toluene diamines, said blend formed of a mole ratio between about 4:1 and about 19:1 butanediol to said diamine and wherein said liquid blend is combined with said component (b) in a mole ratio of from about 1:0.01 and about 1:0.9 prior to contact with said component (a) and wherein components (a), (b), (c) and (d) are contacted for a period less than 1 minute in a high impingement mixing zone prior to pressurizing the contacted mixture into a mold maintained at polymerization temperature for a period of not more than 1 minute and recovering molded polyurethane-polyurea elastomer from said mold.
Claim 2
Dependent Claim
223 words
In a process for the production of polyurethane-polyurea elastomer moldings from a reaction mixture by a reaction injection molding process, wherein said reaction mixture comprises the components: (a) an isocyanate reactant; (b) a polyol reactant having molecular weight of from 400 to 12,000; (c) a chain extender; and (d) a catalyst; the improvement wherein said chain extender is a normally liquid blend of butanediol and a mono-substituted toluene diamine having the formula ##STR4## wherein X is vicinal to an amino radical and is an electron-withdrawing substituent selected from the group of halo, CN, NO 2 , acyl and carboxylate and wherein the alkyl moieties of said acyl and carboxylate groups contain 1 to 6 carbon atoms, and isomeric mixtures of said mono-substituted toluene diamines, said blend formed of a mole ratio between about 4:1 and about 19:1 butanediol to said diamine and wherein said liquid blend is combined with said component (b) in a mole ratio of from about 1:0.01 and about 1:0.9 prior to contact with said component (a) and wherein components (a), (b), (c) and (d) are contacted for a period less than 1 minute in a high impingement mixing zone prior to pressurizing the contacted mixture into a mold maintained at polymerization temperature for a period of not more than 1 minute and recovering molded polyurethane-polyurea elastomer from said mold.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the chain extender blend is a mixture of butanediol and a monochlorotoluenediamine combined in a mole ratio of between about 5:1 and about 12:1.
Claim 4
Dependent Claim
22 words
The process of claim 2 wherein the mole ratio of said blend with component (b) is between about 1:0.05 and about 1:0.5.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the isocyanate index number is between about 95 and about 150.
Claim 6
Dependent Claim
36 words
The process of claim 1 wherein the components (a), (b), (c) and (d) are mixed at a temperature of from about 20° C. to about 75° C. and molded at the same or a higher temperature.
Claim 7
Dependent Claim
25 words
The process of claim 2 wherein said chain extender blend is employed in a concentration of at least 5% by weight of the polyolisocyanate mixture.
Claim 8
Dependent Claim
8 words
The product of the process of claim 1.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |