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US5543477A
Expired / Lapsed
US
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Copolymers of ethylene and alkyl acrylate with improved melt-point temperatures
Assignee: Westlake Longview Corp
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Filing: 1992-09-21
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Granted: 1996-08-06
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Expires: 2012-09-21
Abstract
Abstract Disclosed are copolymers of ethylene and alkyl acrylate monomers and methods of making those copolymers. Said copolymers exhibit increased melt-point temperatures and decreased hardness over similar conventional copolymers.
Inventors
- 👤 Jerry G. Latiolais
- 👤 Nicholas R. Galante
- 👤 J. Paul Gathright
- 👤 James H. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:49
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44; C08F210/00; C08F210/02; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0869; C08L23/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
199 words
A process for the preparation of ethylene-alkyl acrylate copolymers comprising: A. feeding overall an amount by weight, A, of alkyl acrylate an amount by weight, E, of ethylene to a multi-zoned polymerization reactor; B. introducing an effective amount of an initiator and at least a portion, E 1 , of the total amount of ethylene into a first reaction zone of the reactor; C. concurrently introducing a portion, A 1 , of alkyl acrylate to said first reaction zone such that (1) greater than about 55 percent of the overall amount of alkyl acrylate is introduced into said first reaction zone, (2) the amount A 1 , of alkyl acrylate fed to said first reaction zone is greater than the total amount of alkyl acrylate fed to all subsequent reaction zones, and (3) the ratio of A 1 to E 1 in said first reaction zone is greater than the ratio of A to E for the reactor overall; and D. feeding additional initiator, ethylene and optionally alkyl acrylate to a subsequent reaction zone or zones; wherein the alkyl acrylate content of the final copolymer is greater than ten weight percent based on the total weight of the copolymer.
Claim 2
Dependent Claim
199 words
A process for the preparation of ethylene-alkyl acrylate copolymers comprising: A. feeding overall an amount by weight, A, of alkyl acrylate an amount by weight, E, of ethylene to a multi-zoned polymerization reactor; B. introducing an effective amount of an initiator and at least a portion, E 1 , of the total amount of ethylene into a first reaction zone of the reactor; C. concurrently introducing a portion, A 1 , of alkyl acrylate to said first reaction zone such that (1) greater than about 55 percent of the overall amount of alkyl acrylate is introduced into said first reaction zone, (2) the amount A 1 , of alkyl acrylate fed to said first reaction zone is greater than the total amount of alkyl acrylate fed to all subsequent reaction zones, and (3) the ratio of A 1 to E 1 in said first reaction zone is greater than the ratio of A to E for the reactor overall; and D. feeding additional initiator, ethylene and optionally alkyl acrylate to a subsequent reaction zone or zones; wherein the alkyl acrylate content of the final copolymer is greater than ten weight percent based on the total weight of the copolymer.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the alkyl acrylate is methyl acrylate, ethyl acrylate, butyl acrylate or mixtures thereof.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the alkyl acrylate is methyl acrylate.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the ratio of E 1 to E is between about 0.25 and 0.75.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the ratio of E 1 to E is about 0.50.
Claim 7
Dependent Claim
26 words
The process of claim 1 wherein the ratio of A 1 to E l is greater than about 1.2 times the ratio of A to E.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein the ratio of A 1 to E 1 is greater than about 1.4 times the ratio of A to E.
Claim 9
Dependent Claim
164 words
A process for the preparation of ethylene-alkyl acrylate copolymers comprising introducing to a first reaction zone in a multi-zoned reactor, initiator, ethylene and a quantity of an alkyl acrylate which is (1) in excess of 55% of the amount of alkyl acrylate fed overall to the reactor and (2) greater than the total amount of alkyl acrylate fed to all subsequent reaction zones, said quantity of alkyl acrylate being effective to increase the average melt point temperature of said copolymers at least about 8° over the melt-point temperature of a copolymer having the same alkyl acrylate content by weight as said produced copolymer and made by introducing about 50% of the alkyl acrylate fed overall to the reactor to said first reaction zone and about 50% of the ethylene fed overall to the reactor to said first reaction zone, and wherein the amount of alkyl acrylate in the final copolymer is greater than ten weight percent based on the total weight of the copolymer.
Claim 10
Dependent Claim
164 words
A process for the preparation of ethylene-alkyl acrylate copolymers comprising introducing to a first reaction zone in a multi-zoned reactor, initiator, ethylene and a quantity of an alkyl acrylate which is (1) in excess of 55% of the amount of alkyl acrylate fed overall to the reactor and (2) greater than the total amount of alkyl acrylate fed to all subsequent reaction zones, said quantity of alkyl acrylate being effective to increase the average melt point temperature of said copolymers at least about 8° over the melt-point temperature of a copolymer having the same alkyl acrylate content by weight as said produced copolymer and made by introducing about 50% of the alkyl acrylate fed overall to the reactor to said first reaction zone and about 50% of the ethylene fed overall to the reactor to said first reaction zone, and wherein the amount of alkyl acrylate in the final copolymer is greater than ten weight percent based on the total weight of the copolymer.
Claim 11
Dependent Claim
19 words
The process of claim 8 wherein the alkyl acrylate is methyl acrylate, ethyl acrylate, butyl acrylate or mixtures thereof.
Claim 12
Dependent Claim
12 words
The process of claim 9 wherein the alkyl acrylate is methyl acrylate.
Claim 13
Dependent Claim
125 words
A process for preparing ethylene-alkyl acrylate copolymer comprising feeding overall an amount by weight, A, of alkyl acrylate and an amount by weight, E, of ethylene to a multi-zoned polymerization reactor in the presence of initiator, feeding an amount by weight, A 1 , of alkyl acrylate and an amount by weight, E 1 , of ethylene in a first reaction zone of the reactor, wherein A 1 is greater than about 55% of A, and A 1 /E 1 is greater than A/E, and then feeding an additional amount of initiator, ethylene, and optionally alkyl acrylate in a subsequent reaction zone or zones; wherein the amount of alkyl acrylate in the copolymer is greater than ten weight percent based on the total copolymer weight.
Claim 14
Dependent Claim
125 words
A process for preparing ethylene-alkyl acrylate copolymer comprising feeding overall an amount by weight, A, of alkyl acrylate and an amount by weight, E, of ethylene to a multi-zoned polymerization reactor in the presence of initiator, feeding an amount by weight, A 1 , of alkyl acrylate and an amount by weight, E 1 , of ethylene in a first reaction zone of the reactor, wherein A 1 is greater than about 55% of A, and A 1 /E 1 is greater than A/E, and then feeding an additional amount of initiator, ethylene, and optionally alkyl acrylate in a subsequent reaction zone or zones; wherein the amount of alkyl acrylate in the copolymer is greater than ten weight percent based on the total copolymer weight.
Claim 15
Dependent Claim
19 words
The process of claim 11 wherein the alkyl acrylate is methyl acrylate, ethyl acrylate, butyl acrylate or mixtures thereof.
Claim 16
Dependent Claim
12 words
The process of claim 12 wherein the alkyl acrylate is methyl acrylate.
Claim 17
Dependent Claim
18 words
The process of claim 11 wherein the ratio of E 1 to E is between 0.25 and 0.75.
Claim 18
Dependent Claim
16 words
The process of claim 14 wherein the ratio of E 1 to E is about 0.50.
Claim 19
Dependent Claim
26 words
The process of claim 11 wherein the ratio of A 1 to E 1 is greater than about 1.2 times the ratio of A to E.
Claim 20
Dependent Claim
26 words
The process of claim 16 wherein the ratio of A 1 to E 1 is greater than about 1.4 times the ratio of A to E.
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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) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |