US4751141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture and use of a polypropylene foil with improved adhesion
Assignee: Alkor GmbH Kunstoffverkauf
•
Filing: 1983-02-24
•
Granted: 1988-06-14
•
Expires: 2003-02-24
Abstract
Abstract A polypropylene foil with a content of fine particles of cellulose acquires substantially improved adhesion properties through surface activation, for example, radiation.
Inventors
- 👤 Roland Fink
- 👤 Heinrich Heitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:17
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08J; C08J7/00; C08J7/04; C08J7/0427; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; B; B27; B27K; B27K5/00; B27K5/02; C08J2323/00; C08J2323/02; C08J2323/04; C08J2401/00; C08J2401/02; C08L1/00; C08L23/04; C08L23/06; C08L2310/00; C08L53/00; C08L53/02; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/253; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31888; Y10T428/31938
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
98 words
A polyolefin film having a resistance to heat of VSP/A above 100° C., said film consisting essentially of a random or block copolymer of polypropylene and either 1 to 10 mol % ethylene or 5 to 20 mol % polyethylene, and having adhesion properties that can be improved by surface activation, comprising a content of surface activating material consisting of fine particles of cellulose prepared according to the sulfide or sulfate process, which particles have a thickness of 10 to 30 μm and a length of from 5 to 100 μm, and a content of a mineral filler.
Claim 2
Dependent Claim
98 words
A polyolefin film having a resistance to heat of VSP/A above 100° C., said film consisting essentially of a random or block copolymer of polypropylene and either 1 to 10 mol % ethylene or 5 to 20 mol % polyethylene, and having adhesion properties that can be improved by surface activation, comprising a content of surface activating material consisting of fine particles of cellulose prepared according to the sulfide or sulfate process, which particles have a thickness of 10 to 30 μm and a length of from 5 to 100 μm, and a content of a mineral filler.
Claim 3
Dependent Claim
18 words
A film, as claimed in claim 1, wherein the cellulose content is from 3 to 30% by weight.
Claim 4
Dependent Claim
28 words
A film, as claimed in claim 2, comprising from about 3 to about 30 weight percent of mineral filler, based on the total weight of polyolefin and cellulose.
Claim 5
Dependent Claim
15 words
A film as claimed in claim 3 in which the mineral filler is calcium carbonate.
Claim 6
Dependent Claim
14 words
A film, as claimed in claim 1, wherein the surface is activated by radiation.
Claim 7
Dependent Claim
12 words
A film, as claimed in claim 1, further comprising a modifying agent.
Claim 8
Dependent Claim
122 words
In a process for the manufacture of a polyolefin film with improved adhesion properties wherein the film has a resistance to heat of VSP/A above 100° C., said film consisting essentially of a random or block copolymer of polypropylene and either 1 to 10 mol % ethylene or 5 to 20 mol % polyethylene and wherein the film is formed from a film mass and subjected to a surface-activation treatment, the improvement comprising adding, before forming the film, a content of a mineral filler and a surface activating material consisting of fine particles of cellulose prepared according to the sulfide or sulfate process, which particles have a thickness of 10 to 30 μm and a length of from 5 to 100 μm.
Claim 9
Dependent Claim
122 words
In a process for the manufacture of a polyolefin film with improved adhesion properties wherein the film has a resistance to heat of VSP/A above 100° C., said film consisting essentially of a random or block copolymer of polypropylene and either 1 to 10 mol % ethylene or 5 to 20 mol % polyethylene and wherein the film is formed from a film mass and subjected to a surface-activation treatment, the improvement comprising adding, before forming the film, a content of a mineral filler and a surface activating material consisting of fine particles of cellulose prepared according to the sulfide or sulfate process, which particles have a thickness of 10 to 30 μm and a length of from 5 to 100 μm.
Claim 10
Dependent Claim
25 words
A process as claimed in claim 7 wherein 1 to 50% by weight of cellulose is added based on the sum of polyolefin and cellulose.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 8, wherein 3 to 30% by weight of cellulose is added.
Claim 12
Dependent Claim
14 words
A process as claimed in claim 7 wherein the surface is activated by radiation.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 7 wherein mica, talc, silicic acid, silicates or TiO 2 are added as mineral filler.
Claim 14
Dependent Claim
29 words
A process as claimed in claim 7 wherein the amount of mineral filler added is 1 to 50% by weight based on the total weight of polyolefin and cellulose.
Claim 15
Dependent Claim
21 words
A process as claimed in claim 7 further comprising adding a modifying agent to the foil mass before forming the foil.
Claim 16
Dependent Claim
17 words
A process as claimed in claim 13, wherein the modifying agent is based on styrene and elastomers.
Claim 17
Dependent Claim
15 words
A process as claimed in claim 7 wherein calcium carbonate is added as mineral filler.
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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |