Patent US3856766A successfully refreshed from Google Patents.
US3856766A
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Process for the manufacture of a light colored thermostable chlorinated polyolefin
Assignee: Hoechst AG
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Filing: 1973-12-13
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Granted: 1974-12-24
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Expires: 1993-12-13
Abstract
Abstract A light colored thermostable chlorinated polyethylene, polypropylene or copolymer of ethylene with an Alpha -olefin having three to six carbon atoms is obtained by chlorinating the polymer having a molecular weight in the range of from 20,000 to 2,000,000 with gaseous chlorine containing 0.01 to 1.5 % by weight of steam.
Inventors
- 👤 H Klug
- 👤 A Mukerjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:58
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/20; C08F8/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A PROCESS FOR THE MANUFACTURE OF A LIGHT COLORED THERMOSTABLE CHLOROPHOLYOLEFIN BY CHLORINATING PULVERULENT POLYETHYLENE, POLYPROPYLENE OR A COPOLYMER OF ETHYLENE WITH A STRAIGHT CHAIN OR BRANCED A-OLEFIN HAVING 3 TO 6 CARBON ATOMS, THE MOLECULAR WEIGHT OF THE POLYMER BEING I THE RANGE OF FROM ABOUT 20,00 TO 2,000,000, WITH GASEOUS CHLORINE IN A FLUIDIZED OR MOVING BED, WHICH COMPRISES CARRYING OUT THE CHLORINATION WITH GASEOUS CHLORINE CONTAINING 0.01 TO 1.5% BY WEIGHT OF STREAM.
Claim 2
Dependent Claim
76 words
A PROCESS FOR THE MANUFACTURE OF A LIGHT COLORED THERMOSTABLE CHLOROPHOLYOLEFIN BY CHLORINATING PULVERULENT POLYETHYLENE, POLYPROPYLENE OR A COPOLYMER OF ETHYLENE WITH A STRAIGHT CHAIN OR BRANCED A-OLEFIN HAVING 3 TO 6 CARBON ATOMS, THE MOLECULAR WEIGHT OF THE POLYMER BEING I THE RANGE OF FROM ABOUT 20,00 TO 2,000,000, WITH GASEOUS CHLORINE IN A FLUIDIZED OR MOVING BED, WHICH COMPRISES CARRYING OUT THE CHLORINATION WITH GASEOUS CHLORINE CONTAINING 0.01 TO 1.5% BY WEIGHT OF STREAM.
Claim 3
Dependent Claim
17 words
The process of claim 1, wherein the polyolefin is subjected to a thermal treatment prior to chlorination.
Claim 4
Dependent Claim
24 words
The process of claim 1, wherein the content of steam of the gaseous chlorine is adjusted by means of water or aqueous hydrochloric acid.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |