EP0255181A1
Expired / Lapsed
EP
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Process of (co)polymerization of alpha-olefins in the presence of stabilizers
Assignee: Enichem Sintesi SpA
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Filing: 1987-07-27
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Granted: —
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Expires: 2007-07-27
Abstract
Abstract Stabilizers for organic polymers, consisting of one or more compounds of the classis of the sterically hindered amines (HALS) are directly added to the reaction mixture during the (co)polymerization of the α-olefins or of their mixtures with other unsaturated monomers. The so-obtained polymeric compositions result perfectly stabilized and show a thermo- and photo-oxidative resistance higher than that of the same polymeric compositions to which the same stabilizers are added by a traditional route.
Inventors
- 👤 Silvestro Costanzi
- 👤 Damiano Gussoni
- 👤 Luciano Pallini
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 16:34
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
67 words
Process for the preparation of thermostabilized polymers or co-polymers of α-olefins, consisting in carrying out the polymerization or co-polymerization in the presence of at least a stabilizer agent selected from the derivatives of tetra-alkyl-morpholine and of tetra-alkyl-pyrrolidine, respectively containing the groups (I) and (II): and the derivatives of tetra-alkyl-piperidine- containing the group (III) and substituted in 4-position with a paraffinic polymeric chain, or with a silyl-alkoxy group.
Claim 2
Dependent Claim
67 words
Process for the preparation of thermostabilized polymers or co-polymers of α-olefins, consisting in carrying out the polymerization or co-polymerization in the presence of at least a stabilizer agent selected from the derivatives of tetra-alkyl-morpholine and of tetra-alkyl-pyrrolidine, respectively containing the groups (I) and (II): and the derivatives of tetra-alkyl-piperidine- containing the group (III) and substituted in 4-position with a paraffinic polymeric chain, or with a silyl-alkoxy group.
Claim 3
Dependent Claim
23 words
Process of claim 1, wherein the stabilizer agent is a derivative of tetra-alkyl-morpholine or of tetra-alkyl-pyrrolidine, respectively containing the groups (I) and (II):
Claim 4
Dependent Claim
31 words
Process of claim 2, wherein the stabilizer agent is selected from the derivatives of tetra-alkyl-pyrrolidine, wherein one or more pyrrolidinic groups are condensed on a possibly substituted aliphatic or heteroaromatic ring.
Claim 5
Dependent Claim
28 words
Process of claim 1, wherein the stabilizer agent is selected from the derivatives of tetra-alkyl-piperidine, substituted in 4-position with a paraffinic polymeric chain, or with a silyl-alkoxy group.
Claim 6
Dependent Claim
18 words
Process of claim 4, wherein such stabilizer agent is selected from the derivatives of tetra-alkyl-piperidine having the formulae:
Claim 7
Dependent Claim
16 words
Process of claim 1, wherein the stabilizer agent is added during the step of catalyst quenching.
Claim 8
Dependent Claim
26 words
Process of claim 1, wherein the polymerization is carried out in the presence of a catalyst of Ziegler-Natta type, or on the basis of metal oxides.
Claim 9
Dependent Claim
13 words
Process of claim 7, wherein the catalyst is a catalyst of Ziegler-Natta type.
Claim 10
Dependent Claim
31 words
Process of any of the preceding claims, wherein the olefinic monomer which is polymerized or co-polymerized is selected from ethylene, propylene, 1-butene, 4-methyl-1-pentene, 2-methyl-pentene, 1-pentene, 3-methyl-1-butene, 1-hexene, 1-octene, 2-ethyl-1-hexene, and styrene.
Claim 11
Dependent Claim
13 words
Process of claim 9, wherein the monomer is selected from ethylene and propylene.
Claim 12
Dependent Claim
20 words
Process of any of the preceding claims, wherein the polymerization is carried out in the presence of an inert solvent.
Claim 13
Dependent Claim
36 words
Process of any of the preceding claims, wherein the stabilizer agent is used in such an amount that the so-obtained polymer contains a percentage thereof, by weight, comprised within the range of from 0.005 to 1%.
Claim 14
Dependent Claim
17 words
Process of claim 12, wherein such percentage is comprised within the range of from 0.01 to 0.5.
Claim 15
Dependent Claim
14 words
Stabilized polyolefin obtained by means of the process of any of the preceding claims.
References Cited (Backward Citations)
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