US4490520A
Expired / Lapsed
US
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Process for preparing impact-resistant polyamides
Assignee: Ube Corp
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Filing: 1983-02-24
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Granted: 1984-12-25
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Expires: 2003-02-24
Abstract
Abstract A process for preparing polyamides having improved impact strength and elongation comprising polymerizing an -lactam in the presence of (1) an alkali catalyst and (2) the reaction product of (a) a polyfunctional co-catalyst such as a polyisocyanate and (b) a polyoxyalkalene amine. The polyamides of the present invention are particularly useful for making strong tough molded or cast articles.
Inventors
- 👤 Masao Ogasa
- 👤 Masao Nishiyama
- 👤 Kaoru Ohtsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:17
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
A process for the preparation of an impact-resistant polyamide, which comprises polymerizing an ω-lactam in contact with (1) an alkali catalyst and (2) a product obtained by the reaction between (a) a polyfunctional co-catalyst used in the alkali polymerization of ω-lactam and (b) a polyoxyalkylene amine, the amount of the polyfunctional co-catalyst being such that the total number of the functional groups of the polyfunctional co-catalyst is larger than the total numbr of the amino groups of the polyoxyalkylene amine.
Claim 2
Dependent Claim
80 words
A process for the preparation of an impact-resistant polyamide, which comprises polymerizing an ω-lactam in contact with (1) an alkali catalyst and (2) a product obtained by the reaction between (a) a polyfunctional co-catalyst used in the alkali polymerization of ω-lactam and (b) a polyoxyalkylene amine, the amount of the polyfunctional co-catalyst being such that the total number of the functional groups of the polyfunctional co-catalyst is larger than the total numbr of the amino groups of the polyoxyalkylene amine.
Claim 3
Dependent Claim
95 words
A process according to claim 1, wherein the polyoxyalkylene amine is at least one compound selected from the group consisting of compounds represented by the formula: H.sub.2 NR.sup.1 CH.sub.2 (OCH.sub.2 R.sup.1).sub.n NH.sub.2 wherein R 1 represents an alkylene group having 1 to 3 carbon atoms and n is an integer of at least 3, and compounds represented by the following formula: ##STR2## wherein R 1 is the same as defined above, R 2 is a hydrocarbon group having 1 to 20 carbon atoms, and x, y and z are integers of from 1 to 10.
Claim 4
Dependent Claim
26 words
A process according to claim 2, wherein the polyoxyalkylene amine is at least one compound selected from the group consisting of polyoxypropylene amine and polyoxytetramethylene amine.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein the polyoxyalkylene amine has a number average molecular weight of from 300 to 20,000.
Claim 6
Dependent Claim
31 words
A process according to claim 1, wherein the amount of the polyoxyalkylene amine is in the range of from 1 to 60% bY weight based on the weight of the ω-lactam.
Claim 7
Dependent Claim
31 words
A process according to claim 5, wherein the amount of the polyoxyalkylene amine is in the range of from 5 to 30% by weight based on the weight of the ω-lactam.
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein the polyfunctional co-catalyst is selected from the group consisting of polyisocyanates, carbamidolactams, carboxylic acid chlorides and polyacyl lactams.
Claim 9
Dependent Claim
20 words
A process according to claim 7, wherein the polyfunctional co-catalyst is selected from the group consisting of polyisocyanates and carbamidolactams.
Claim 10
Dependent Claim
37 words
A process according to claim 1, wherein the total number (a) of the functional groups of the polyfunctional co-catalyst and the total number (b) of the amino groups of the polyoxyalkylene amine satisfy the following relation: 1<[(a)/(b)]≦2
Claim 11
Dependent Claim
56 words
a process according to claim 1, wherein the alkali catalyst is at least one member selected from the group consisting of alkali metals; alkaline earth metals; hydrides, oxides, hydroxides, carbonates, alkyl compounds and alkoxides of alkali metals and alkaline earth metals; Grignard's reagents; sodium naphthalene; and alkali metal salts and alkaline earth metal salts of ω-lactams.
Claim 12
Dependent Claim
28 words
A process according to claim 1, wherein the amount of the alkali catalyst is in the range of from 0.05 to 10 mole % based on the ω-lactam.
Claim 13
Dependent Claim
22 words
A process according to claim 1, wherein said polymerization of the ω-lactam is conducted in a mold to produce a shaped article.
Claim 14
Dependent Claim
21 words
A process according to claim 1 further comprising reacting the polyfunctional co-catalyst and the polyoxyalkylene amine prior to the polymerization reaction.
Claim 15
Dependent Claim
30 words
A process according to claim 13 wherein the reaction of the polyfunctional co-catalyst and the polyoxyalkylene amine is conducted in a solvent at a temperature between 10° and 200° C.
Claim 16
Dependent Claim
22 words
A process according to claim 14 wherein the solvent is selected from the group consisting of benzene, toluene, xylene and molten ω-lactam.
Claim 17
Dependent Claim
28 words
A process according to claim 14 wherein the solvent is molten ω-lactam and the reaction is conducted at a temperature higher than the melting point of said ω-lactam.
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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |