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US4066576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene mixture for the manufacture of semiconductive films for bags and sacks
Assignee: Hoechst AG
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Filing: 1976-04-16
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Granted: 1978-01-03
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Expires: 1996-04-16
Abstract
Abstract Mixtures of a low density polyethylene, a rubber and a highly conductive carbon black can be processed to films having an especially low surface resistance.
Inventors
- 👤 Siegfried Bork
- 👤 Georg Sam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L21/00; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/08; C08L23/0846; C08L23/0853; C08L23/16; C08L23/18; C08L23/20; C08L23/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
151 words
A polyethylene mixture for the manufacture of semi-conductive films for bags and sacks having a surface resistance of less than 10 6 Ω and good mechanical properties, which contains a. from 60 to 84% by weight of polyethylene having a density of 0.915-0.930 g/cm 3 , or of a copolymer of ethylene containing up to 5% by weight of comonomers, b. from 7.5 to 30% by weight of a saturated or weakly unsarated rubber, and c. from 8.5 to 15% by weight of carbon black, and optionally usual additives such as stabilizers, procesing auxiliaries or lubricants, wherein the carbon black has a BET surface of from 300 to 1500 m 2 /g, an oil absorption of from 2.5 to 6.5 ml/g, a content of volatile substances of from 0.1 to 6.0% by weight, a pH of from 7 to 10, and an ash content of from 0.5 to 5.0% by weight.
Claim 2
Dependent Claim
151 words
A polyethylene mixture for the manufacture of semi-conductive films for bags and sacks having a surface resistance of less than 10 6 Ω and good mechanical properties, which contains a. from 60 to 84% by weight of polyethylene having a density of 0.915-0.930 g/cm 3 , or of a copolymer of ethylene containing up to 5% by weight of comonomers, b. from 7.5 to 30% by weight of a saturated or weakly unsarated rubber, and c. from 8.5 to 15% by weight of carbon black, and optionally usual additives such as stabilizers, procesing auxiliaries or lubricants, wherein the carbon black has a BET surface of from 300 to 1500 m 2 /g, an oil absorption of from 2.5 to 6.5 ml/g, a content of volatile substances of from 0.1 to 6.0% by weight, a pH of from 7 to 10, and an ash content of from 0.5 to 5.0% by weight.
Claim 3
Dependent Claim
24 words
The polyethylene mixture as claimed in claim 1, wherein the carbon black has a BET surface of from 600 to 1100 m 2 /g.
Claim 4
Dependent Claim
22 words
The polyethylene mixture as claimed in claim 1, wherein the carbon black has an oil absorption of from 3.0 to 4.0 ml/g.
Claim 5
Dependent Claim
25 words
The polyethylene mixture as claimed in claim 1, wherein the carbon black has a content of volatile substances of from 0.5 to 4% by weight.
Claim 6
Dependent Claim
20 words
The polyethylene mixture as claimed in claim 1, wherein the carbon black has a pH of from 8 to 9.5.
Claim 7
Dependent Claim
23 words
The polyethylene mixture as claimed in claim 1, wherein the carbon black has an ash content of from 0.5 to 1% by weight.
Claim 8
Dependent Claim
22 words
The polyethylene mixture as claimed in claim 1, wherein the mixture contains from 65 to 75% by weight of low density polyethylene.
Claim 9
Dependent Claim
23 words
The polyethylene mixture as claimed in claim 1, wherein the mixture contains from 13 to 20% by weight of a weakly unsaturated rubber.
Claim 10
Dependent Claim
21 words
The polyethylene miyture as claimed in claim 1, wherein the mixture contains from 9 to 12% by weight of carbon black.
Claim 11
Dependent Claim
27 words
The polyethylene mixture as claimed in claim 1, wherein the mixture contains a polyethylene having a melt flow index MFI 190/2 of from 0.1 to 3.0 g/min.
Claim 12
Dependent Claim
16 words
The polyethylene mixture as claimed in claim 1, which comprises using an ethylene/propylene/diene copolymer as rubber.
Claim 13
Dependent Claim
41 words
The polyethylene mixture as claimed in claim 11, which comprises using a copolymer of from 40 to 85% by weight of ethylene, from 14.5 to 59.5% by weight of propylene and from 0.3 to 10 weight % of a non-conjugated diene.
Claim 14
Dependent Claim
18 words
The polyethylene mixture as claimed in claim 12, wherein hexadiene-(1,4), dicyclopentadiene or ethylidene-norbornene is used as non-conjugated diene.
Claim 15
Dependent Claim
43 words
The polyethylene mixture as claimed in claim 11, which comprises using an ethylene/propylene/diene copolymer having a Mooney viscosity ML (1+4) at 100° C of from 35 to 100 and a content of double bonds of from 0.5 to 4 per 1000 carbon atoms.
Claim 16
Dependent Claim
13 words
Bags or sacks manufactured from the polyethylene mixtures as claimed in claim 1.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |