US5300361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a polypropylene composite
Assignee: Targor GmbH
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Filing: 1991-05-13
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Granted: 1994-04-05
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Expires: 2011-05-13
Abstract
Abstract In composites comprising at least one solid base layer of a propylene polymer and a foam layer likewise of a propylene polymer, these layers can be bonded by softening only the side of the base layer facing the foam layer and optionally provided with relief structures by warming, and pressing the base layer and foam layer together, giving a very strong bond.
Inventors
- 👤 Hans Vowinkel
- 👤 Franz Gubitz
- 👤 Rolf Orth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:07
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2309/00; B32B2309/12; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249988; Y10T428/31504
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A process for the production of a composite comprising a solid base layer produced by injection molding form a propylene polymer and a foam layer made form a propylene polymer, by bonding the two layers, which comprises softening exclusively the surface of the base layer facing the foam layer, said surface having relief structures thereon, by warming down to a melt layer depth of from 2 to 3 mm and then joining the base layer and the foam layer under a pressure of from 0.1 to 0.4 N/mm 2 .
Claim 2
Dependent Claim
90 words
A process for the production of a composite comprising a solid base layer produced by injection molding form a propylene polymer and a foam layer made form a propylene polymer, by bonding the two layers, which comprises softening exclusively the surface of the base layer facing the foam layer, said surface having relief structures thereon, by warming down to a melt layer depth of from 2 to 3 mm and then joining the base layer and the foam layer under a pressure of from 0.1 to 0.4 N/mm 2 .
Claim 3
Dependent Claim
86 words
A composite comprising a solid base layer produced by injection molding from a propylene polymer ad a foam layer made from a propylene polymer, the composite being produced by bonding the two layers, exclusively the surface of the base layer facing the foam layer and provided with relief structures being softened by warming down to a melt layer depth of from 2 to 3 mm, and the base layer and foam layer then being joined under a pressure of from 0.1 to 0.4 N/mm 2 .
Claim 4
Dependent Claim
86 words
A composite comprising a solid base layer produced by injection molding from a propylene polymer ad a foam layer made from a propylene polymer, the composite being produced by bonding the two layers, exclusively the surface of the base layer facing the foam layer and provided with relief structures being softened by warming down to a melt layer depth of from 2 to 3 mm, and the base layer and foam layer then being joined under a pressure of from 0.1 to 0.4 N/mm 2 .
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) | 1997-04-04 | 1997-10-04 | 1998-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-04 | 2001-10-04 | 2002-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-04 | 2005-10-04 | 2006-04-05 | $7700.00 | Window Closed / Lapsed |