Patent EP0324432A2 successfully refreshed from Google Patents.
EP0324432A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing modified polyamides and polyamides obtainable thereby
Assignee: Enichem SpA
•
Filing: 1989-01-10
•
Granted: —
•
Expires: 2009-01-10
Abstract
Abstract There is described a process for preparing modified polyamides endowed with improved mechanical properties, which process comprises the polymerization of an omega-lactam in the presence of a) a polyisocyanate having isocyanate groups blocked with an omega-lactam, b) a polyoxyalkylene amine, and c) an alkali or an alkaline earth metal catalyst. A further object of the invention are the products obtainable by such a process.
Inventors
- 👤 Sergio Dr. Tonti
- 👤 Piero Dr. Furlan
- 👤 Gianpiero Dr. Talamini
- 👤 Roberto Dr. Pernice
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:26
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
Process for preparing an impact-resistant polyamide, characterized in that an omega-lactam is polymerized in the presence of: a) a polyisocyanate having isocyanate groups blocked with an omega-lactam; b) a polyoxyalkylene amine having an amine functionality of less than three; c) an alkali metal or alkaline earth metal catalyst.
Claim 2
Dependent Claim
48 words
Process for preparing an impact-resistant polyamide, characterized in that an omega-lactam is polymerized in the presence of: a) a polyisocyanate having isocyanate groups blocked with an omega-lactam; b) a polyoxyalkylene amine having an amine functionality of less than three; c) an alkali metal or alkaline earth metal catalyst.
Claim 3
Dependent Claim
107 words
Process according to claim 1, characterized in that (a) the polyisocyanate with blocked isocyanate groups, the omega-lactam and the polyoxyalkylene amine are mixed and melted at a temperature of at the most 110°C, and in that to the resulting mixture the metal catalyst in molten omega-lactam is added whereafter the polymerization temperature is raised to at least 120°C; or (b) to the polyisocyanate with blocked polyisocyanate groups which is dissolved in molten omega-lactam, a mixture of the polyoxyalkylene amine with the molten omega-lactam and the metal catalyst is added at a temperature of at the most 110°C whereafter the polymerization temperature is raised to at least 120°C.
Claim 4
Dependent Claim
28 words
Process according to claim 2, wherein the mixing temperature is from 75° to 100°C and the polymerization temperature ranges from 120° to 250°C, preferably from 130° to 160°C.
Claim 5
Dependent Claim
27 words
Process according to one or more of claims 1 to 3, wherein said polyoxyalkylene amine is a compound having an amine functionality of from 1.5 to 2.9.
Claim 6
Dependent Claim
35 words
Process according to one or more of claims 1 to 4, wherein said polyoxyalkylene amine is a polyoxypropylene diamine, preferably having a molecular weight of from about 200 to about 5000, or a polyoxytetramethylene diamine.
Claim 7
Dependent Claim
45 words
Process according to one or more of claims 1 to 5, wherein the polyoxyalkylene amine is present in an amount of from 1 % to 40 %, preferably of from 5 % to 30 %, by weight, based on the total amount of the reactants.
Claim 8
Dependent Claim
37 words
Process according to one or more of claims 1 to 6, wherein the omega-lactam is selected from gamma-butyrolactam, delta-valerolactam, epsilon-caprolactam, omega-enantholactam, omega-capryllactam, omega-undecanolactam and omega-lauryllactam, either taken individually or in combination, and preferably is epsilon-caprolactam and/or omega-lauryllactam.
Claim 9
Dependent Claim
22 words
Process according to one or more of claims 1 to 7, wherein the polyisocyanate is an aliphatic and/or cycloaliphatic and/or aromatic diisocyanate.
Claim 10
Dependent Claim
35 words
Process according to claim 8, wherein the polyisocyanate is an aliphatic or cycloaliphatic diisocyanate, preferably hexamethylene diisocyanate (HDI) and/or trimethyl hexamethylene diisocyanate (TMDI), or is a mixture of an aliphatic diisocyanate and an aromatic diisocyanate.
Claim 11
Dependent Claim
23 words
Polyamide obtainable by the process of any one of claims 1 to 9, preferably having a yellow index of not higher than -15.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.