US4582879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction injection molding process and reaction injection molded products
Assignee: Stamicarbon BV
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Filing: 1984-03-22
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Granted: 1986-04-15
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Expires: 2004-03-22
Abstract
Abstract A reaction injection molding process is disclosed comprising: introducing a mixture of substantially stable reactant streams into a mold, said mixture, in the aggregate, containing polyamide polymer forming compounds and polyurethane polymer forming compounds, said polyamide polymer forming compounds including lactam, an anionic polymerization catalyst and a polymerization activator, said polyurethane polymer forming compounds including a polyol, a polyisocyanate, a chain extender if desired, and a polyurethane polymerization catalyst, said polyamide polymer forming compounds and said polyurethane forming compounds reacting to respectively form polyamide and polyurethane polymers in said mold to thereby yielding a reaction injection molded product composed of said polymers; and recovering said product from said mold.
Inventors
- 👤 Kurt C. Frisch
- 👤 Kaneyoshi Ashida
- 👤 Jozef L. M. van der Loos
- 👤 Albert A. Van Geenen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:15
CPC Classifications
C; C08; C08L; C08L77/00; C08G; C08G18/00; C08L75/00; C08G2120/00; Y; Y10; Y10S; Y10S525/00; Y10S525/903
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
102 words
A reaction injection molding process comprising: introducing a mixture substantially obtained from stable reactant streams into a mold, said mixture, in the aggregate, containing polyamide polymer forming compounds and polyurethane polymer forming compounds, said polyamide polymer forming compounds including lactam, an anionic polymerization catalyst and a polymerization activator, said polyurethane polymer forming compounds including a polyol, a polyisocyanate and a polyurethane polymerization catalyst, said polyamide polymer forming compounds and said polyurethane forming compounds reacting to respectively form polyamide and polyurethane polymers in said mold thereby yielding a reaction injection molded product composed of said polymers; and recovering said product from said mold.
Claim 2
Dependent Claim
102 words
A reaction injection molding process comprising: introducing a mixture substantially obtained from stable reactant streams into a mold, said mixture, in the aggregate, containing polyamide polymer forming compounds and polyurethane polymer forming compounds, said polyamide polymer forming compounds including lactam, an anionic polymerization catalyst and a polymerization activator, said polyurethane polymer forming compounds including a polyol, a polyisocyanate and a polyurethane polymerization catalyst, said polyamide polymer forming compounds and said polyurethane forming compounds reacting to respectively form polyamide and polyurethane polymers in said mold thereby yielding a reaction injection molded product composed of said polymers; and recovering said product from said mold.
Claim 3
Dependent Claim
25 words
Process according to claim 1, wherein said anionic polymerization catalyst is at least one of: alkali metal, alkali metal compound, Grignard compound, or mixtures thereof.
Claim 4
Dependent Claim
18 words
Process according to claim 1, wherein said activator is a lactam terminated isocyanate, or an acyl lactam compound.
Claim 5
Dependent Claim
25 words
Process according to claim 3, wherein said activator is the reaction product of a high molecular weight polyol and a compound providing the activator group.
Claim 6
Dependent Claim
18 words
Process according to claim 4, wherein said polymeric polyol is a diol, triol, tetrol or a combination thereof.
Claim 7
Dependent Claim
17 words
Process according to claim 4, wherein the equivalent weight of said polymeric polyol is at least 300.
Claim 8
Dependent Claim
30 words
Process according to claim 1, wherein said polyol is a polyether polyol, polyester polyol, polybutadiene polyol, grafted polyether polyol, the polyurea-dispersions in polyetherpolyol, or in polyesterpolyol, or a mixture thereof.
Claim 9
Dependent Claim
25 words
Process according to claim 1, wherein said polyisocyanate is an aromatic polyisocyanate, an aliphatic polyisocyanate, an araliphatic polyisocyanate, a cycloaliphatic polyisocyanate or a mixture thereof.
Claim 10
Dependent Claim
23 words
Process according to claim 1, wherein said polyurethane catalyst is tertiary amine, a tin salt of a carboxylic acid or a mixture thereof.
Claim 11
Dependent Claim
18 words
Process according to claim 1, wherein the mold temperature is between about 100° C. and about 250° C.
Claim 12
Dependent Claim
22 words
Process according to claim 1, wherein said residence time of said mixture in said mold is between 10 seconds and 10 minutes.
Claim 13
Dependent Claim
12 words
A reaction injection molded product prepared by the process of claim 1.
Claim 14
Dependent Claim
13 words
A reaction injection molded product composed of a polyamide polymer and polyurethane polymer.
Claim 15
Dependent Claim
13 words
A reaction injection molded product composed of a polyamide polymer and polyurethane polymer.
Claim 16
Dependent Claim
29 words
A product according to claim 13 wherein said product is an interpenetrating polymer network of said polyamide polymer and said polyurethane polymer in which both polymers are cross-linked independently.
Claim 17
Dependent Claim
22 words
A product according to claim 13 wherein only one of said polyamide polymer or said polyurethane polymer is substantially linear or branched.
Claim 18
Dependent Claim
19 words
A product according to claim 13 wherein both said polyamide and said polyurethane polymer are substantially linear or branched.
Claim 19
Dependent Claim
12 words
A product according to claim 15, wherein said polyamide polymer is branched.
Claim 20
Dependent Claim
12 words
A product according to claim 16, wherein said polyamide polymer is branched.
Claim 21
Dependent Claim
22 words
Process according to claim 1 wherein the weight ratio of polyurethane forming compounds to polyamide forming compounds is from 95:5 to 5:95.
Claim 22
Dependent Claim
20 words
A product according to claim 14, wherein the weight ratio of polyurethane to polyamide is from about 95:5 to 5.95.
Claim 23
Dependent Claim
38 words
Process according to claim 1, where in said process the mold temperature is between about 100° C. and about 250° C. and the residence time of said mixture in said mold is between 10 seconds and 10 minutes.
References Cited (Backward Citations)
FR905823A
Cited
CA905040A
Cited
US3304291A
Cited
US3245961A
Cited
GB1067153A
Cited
GB1099265A
Cited
US3511893A
Cited
CA918008A
Cited
US4501821A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
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