US3935181A
Expired / Lapsed
US
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Process for chlorinating ethylene polymers
Assignee: Stamicarbon BV
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Filing: 1974-08-27
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Granted: 1976-01-27
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Expires: 1994-08-27
Abstract
Abstract A process for chlorinating solid, finely-divided ethylene polymers is disclosed, wherein the resulting chloropolyethylene has a statistical or hybridical distribution of chlorine in the polymer. The polymer is mixed with 10 - 100% by weight of water, based on the weight of the ethylene polymer, and the polymer is chlorinated with chlorine at a temperature which is above the crystalline melting point of the ethylene polymer during at least 70% of the chlorination period. The chlorination pressure is such that the boiling point of water at that pressure is at least equal to the chlorination temperature. The amount of water in the ethylene polymer is maintained at a level of at least 10% by weight based on starting ethylene polymer until the chlorination has proceeded at least to the point where the chlorine content of the polymer is 15% by weight.
Inventors
- 👤 Lowhardt A. A. Schoen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:57
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
151 words
Process for chlorinating a solid, finely divided ethylene polymer to produce statistical or hybridical chloropolyethylene, said process comprising a. mixing said polymer with 10 to 100% by weight of water, based on the weight of ethylene polymer, and b. chlorinating the polymer with gaseous chlorine at a temperature which is below the ethylene polymer decomposition temperature and above the crystalline melting point of the ethylene polymer during at least about 70% of the chlorination period and at a pressure such that the boiling point of water at said pressure is at least equal to the said chlorination temperature while maintaining the amount of water in the ethylene polymer at a level of at least 10% by weight, based on the weight of starting ethylene polymer, until the chlorination has proceeded to a polymer chlorine content of at least 15% by weight and maintaining the water substantially uniformly distributed in the polymer.
Claim 2
Dependent Claim
151 words
Process for chlorinating a solid, finely divided ethylene polymer to produce statistical or hybridical chloropolyethylene, said process comprising a. mixing said polymer with 10 to 100% by weight of water, based on the weight of ethylene polymer, and b. chlorinating the polymer with gaseous chlorine at a temperature which is below the ethylene polymer decomposition temperature and above the crystalline melting point of the ethylene polymer during at least about 70% of the chlorination period and at a pressure such that the boiling point of water at said pressure is at least equal to the said chlorination temperature while maintaining the amount of water in the ethylene polymer at a level of at least 10% by weight, based on the weight of starting ethylene polymer, until the chlorination has proceeded to a polymer chlorine content of at least 15% by weight and maintaining the water substantially uniformly distributed in the polymer.
Claim 3
Dependent Claim
25 words
Process according to claim 1, wherein the chlorination is conducted in the presence of a chlorination reaction initiator or radiation which initiates the chlorination reaction.
Claim 4
Dependent Claim
33 words
Process according to claim 1, wherein the chlorination temperature is below the softening point of the starting ethylene polymer at least during the chlorination to a polymer chlorine content of 15% by weight.
Claim 5
Dependent Claim
39 words
Process according to claim 1, wherein at least 10% by weight of water is present, based on the weight of starting ethylene polymer, until the chlorination has proceeded to a polymer chlorine content of at least 20% by weight.
Claim 6
Dependent Claim
29 words
Process according to claim 1, wherein from 0.05 - 1% by weight of a wetting agent, based on the weight of water, is incorporated in the ethylene polymer/water system.
Claim 7
Dependent Claim
25 words
Process according to claim 5, wherein no more than 0.1% by weight of the wetting agent, based on the weight of the water, is used.
Claim 8
Dependent Claim
41 words
Process according to claim 1, wherein at least 1 strong acid or strong acid salt electrolyte is incorporated in the ethylene/polymer water system in an amount of at most 50% by weight of electrolyte, based on the weight of the water.
Claim 9
Dependent Claim
16 words
Process according to claim 7, wherein at least 1% by weight of the electrolyte is used.
Claim 10
Dependent Claim
30 words
Process according to claim 1, wherein water which is evaporated during the chlorination is condensed and returned to the chlorination zone during at least a portion of the chlorination reaction.
Claim 11
Dependent Claim
24 words
Process according to claim 1, wherein the water which is evaporated in the chlorination zone during the chlorination reaction is discharged from said zone.
Claim 12
Dependent Claim
28 words
Process according to claim 1, wherein the chlorination is continued until the resulting chlorinated ethylene polymers have a chlorine content of from 10 to about 50% by weight.
Claim 13
Dependent Claim
15 words
Process according to claim 11, wherein said chlorine content is 30 - 48% by weight.
Claim 14
Dependent Claim
32 words
Process according to claim 10, wherein at least during the latter portion of the chlorination reaction, water is removed so that the final chlorinated ethylene polymer is obtained in a dry state.
Claim 15
Dependent Claim
29 words
Process according to claim 1, wherein the degree of suspension of the ethylene/polymer water mixture is from 50 - 65 during at least a portion of the chlorination reaction.
Claim 16
Dependent Claim
26 words
Process according to claim 1, wherein the chlorination temperature is above the crystalline melting point of the ethylene polymer during substantially all of the chlorination period.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |