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US4609420A
Expired / Lapsed
US
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Adhesion of layers of adhesive which are applied onto polyolefin surfaces from aqueous dispersion
Assignee: BASF SE
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Filing: 1984-12-03
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Granted: 1986-09-02
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Expires: 2004-12-03
Abstract
Abstract Layers of adhesives which are applied onto polyolefin surfaces from aqueous dispersion exhibit improved adhesion if a dicarboxylic acid dihydrazide of 2 to 10 carbon atoms and an aqueous dispersion of an adhesive polymer are applied, preferably as a mixture, onto the polyolefin surfaces which have been pretreated by corona discharge.
Inventors
- 👤 Oral Aydin
- 👤 Hans Kast
- 👤 Hans-Joachim Fricke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:24
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/124; C08J5/127; C08J7/00; C08J7/12; C09; C09J; C09J201/00; C09J7/00; C09J7/50; C08J2323/00; C08J2323/02; C08L; C08L2666/00; C08L2666/28; C08L2666/36; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A process for improving the adhesion of a layer of adhesive which is applied onto a polyolefin surface from aqueous dispersion comprising the steps of pretreating a polyolefin surface by corona discharge and applying a carboxylic acid dihydrazide of 2 to 10 carbon atoms and an aqueous dispersion of an adhesive polymer onto said polyolefin surface.
Claim 2
Dependent Claim
56 words
A process for improving the adhesion of a layer of adhesive which is applied onto a polyolefin surface from aqueous dispersion comprising the steps of pretreating a polyolefin surface by corona discharge and applying a carboxylic acid dihydrazide of 2 to 10 carbon atoms and an aqueous dispersion of an adhesive polymer onto said polyolefin surface.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein a dicarboxylic acid dihydrazide of 2 to 10 carbon atoms and an aqueous dispersion of an adhesive polymer are applied as a mixture onto said polyolefin surface.
Claim 4
Dependent Claim
59 words
The process of claim 1, wherein a dicarboxylic acid dihydrazide of 2 to 10 carbon atoms, in the form of a mixture with an aqueous dispersion of an adhesive polymer, is applied onto a polyolefin surface pretreated by corona discharge in an amount ranging from 0.01 to 4 weight percentage based on the polymer content of the aqueous dispersion.
Claim 5
Dependent Claim
24 words
The process of claim 3, wherein said amount ranges from 0.1 to 2 weight percentage based on the polymer content of the aqueous dispersion.
Claim 6
Dependent Claim
50 words
The process of claim 1, wherein a dicarboxylic acid dihydrazide of 2 to 10 carbon atoms in its solution of water or a lower alcohol is applied onto a polyolefin surface pretreated by corona discharge, in an amount ranging from 0.001 to 1 g per m 2 of polyolefin surface.
Claim 7
Dependent Claim
20 words
The process of claim 5, wherein said amount ranges from 0.002 to 0.05 g per m 2 of polyolefin surface.
Claim 8
Dependent Claim
21 words
The process of claim 1, wherein the aqueous dispersion of an adhesive polymer has a glass transition temperature below 50° C.
Claim 9
Dependent Claim
21 words
The process of claim 1, wherein the aqueous dispersion of an adhesive polymer has a glass transition temperature below 25° C.
Claim 10
Dependent Claim
25 words
The process of claim 1, wherein the polymer content of an aqueous dispersion of an adhesive polymer ranges from 40 to 60 percent by weight.
Claim 11
Dependent Claim
48 words
The process of claim 1, wherein a dicarboxylic acid dihydrazide is selected from the group consisting of oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, itaconic acid dihydrazide and isophtalic acid dihydrazide.
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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) | 1989-09-01 | 1990-03-03 | 1990-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-01 | 1994-03-03 | 1994-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-01 | 1998-03-03 | 1998-09-02 | $7700.00 | Window Closed / Lapsed |