US4026967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making grafted polymeric material
Assignee: EIDP Inc
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Filing: 1976-06-25
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Granted: 1977-05-31
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Expires: 1996-06-25
Abstract
Abstract A continuous process is disclosed for manufacturing a grafted polymeric material of improved quality. The process is conducted in baffled tubular reactors which exhibit dispersed plug-flow character and which provide: rapid heating and cooling of reactants; short reaction time with uniform material residence time; and radial uniformity of temperature.
Inventors
- 👤 Edmund Arthur Flexman, Jr.
- 👤 Frank Clyde Starr, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
C; C08; C08F; C08F255/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A process for making grafted polymeric material comprising the steps of: (a) mixing a backbone polymer and a graft monomer; (b) introducing the mixture into a tubular reactor device exhibiting dispersed plug-flow character; (c) raising the temperature of the mixture to from 275 to 550 degrees centigrade; (d) conducting the mixture through the tubular reactor in a time adequate to accomplish a grafting reaction and less than necessary for excessive degradation, maintaining the temperature of step (c) for from ten to one-quarter minutes to yield grafted polymeric material.
Claim 2
Dependent Claim
88 words
A process for making grafted polymeric material comprising the steps of: (a) mixing a backbone polymer and a graft monomer; (b) introducing the mixture into a tubular reactor device exhibiting dispersed plug-flow character; (c) raising the temperature of the mixture to from 275 to 550 degrees centigrade; (d) conducting the mixture through the tubular reactor in a time adequate to accomplish a grafting reaction and less than necessary for excessive degradation, maintaining the temperature of step (c) for from ten to one-quarter minutes to yield grafted polymeric material.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the temperature of the grafted polymeric material is reduced from the temperature of step (c) to less than 300 centigrade in less than three minutes.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the temperature of step (c) is maintained for less than about five minutes.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein the backbone polymer is selected from the group consisting of thermoplastic and elastomeric polymers of ethylene and copolymers derived from ethylene and C 3 -C 8 alpha-olefins.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein the backbone polymer is substantially saturated.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the backbone polymer is high density polyethylene.
Claim 8
Dependent Claim
18 words
The process of claim 4 wherein the backbone polymer has a substantially saturated backbone chain and unsaturated side-chains.
Claim 9
Dependent Claim
23 words
The process of claim 7 wherein the backbone polymer is a copolymer of ethylene and at least one C 3 -C 8 alpha-olefin.
Claim 10
Dependent Claim
18 words
The process of claim 8 wherein the backbone polymer is a copolymer of ethylene, propylene, 1,4-hexadiene, and norbornadiene.
Claim 11
Dependent Claim
33 words
A process for making a grafted polymeric material by reacting a backbone polymer with a graft monomer wherein the improvement comprises conducting the reaction in a tubular reactor device exhibiting dispersed plug-flow character.
Claim 12
Dependent Claim
33 words
A process for making a grafted polymeric material by reacting a backbone polymer with a graft monomer wherein the improvement comprises conducting the reaction in a tubular reactor device exhibiting dispersed plug-flow character.
Claim 13
Dependent Claim
71 words
A process for making a grafted polymeric material by reacting a graft monomer with a backbone polymer wherein the improvement comprises conducting the reaction at a temperature of from 275 to 550 degrees centigrade for a duration of from about ten minutes to one-quarter minute in a tubular reactor device exhibiting dispersed plug-flow character, a radial temperature difference of less than ten degrees, and a Peclet Number of greater than 100.
Claim 14
Dependent Claim
71 words
A process for making a grafted polymeric material by reacting a graft monomer with a backbone polymer wherein the improvement comprises conducting the reaction at a temperature of from 275 to 550 degrees centigrade for a duration of from about ten minutes to one-quarter minute in a tubular reactor device exhibiting dispersed plug-flow character, a radial temperature difference of less than ten degrees, and a Peclet Number of greater than 100.
Claim 15
Dependent Claim
31 words
The process of claim 11 wherein the reaction temperature is from 350 to 500 degrees centigrade and the duration of the reaction is from about one-half minute to about five minutes.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |