US5082869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-linked polypropylene compositions suitable for the preparation of foamed materials
Assignee: Basell Technology Co BV
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Filing: 1991-03-07
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Granted: 1992-01-21
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Expires: 2011-03-07
Abstract
Abstract This invention relates to PP compositions, particularly suitable for the preparation of foamed materials, comprising, by weight: a) 3-75% of cross-linked PP b) 97-25% of not cross-linked PP, having (η) comprised between 0.50 and 1.3 dl/g, and are characterized by: M.I. (230° C., 2.16 Kg) comprised between 0.001 and 600 kg/10' cross-linked PP as dispersion in the not cross-linked PP, and in form of about spheroidal gels of 0.5-100 microns and to a process for the preparation of the above mentioned compositions, comprising to allow a mix of PP with peroxidic cross-linking, a furane derivative co-agent and optionally a foaming agent, to undergo a dynamical vulcanization.
Inventors
- 👤 Vittorio Braga
- 👤 Renato Ghisellini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08K; C08K5/00; C08K5/04; C08K5/14; C08K5/15; C08K5/16; C08K5/29; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
Foamed materials, having density between 0.2 and 0.4 g/cm 3 comprising a mixture having melting index (at 230° C., 2.16 kg) between 0.001 and 600 kg/10' consisting of: A) 3-75% by weight of cross-linked polypropylene; B) 97-25% by weight of non cross-linked polypropylene, having intrinsic viscosity in tetrahydronaphthalene at 135° C. between 0.50 and 1/3 dl/g.
Claim 2
Dependent Claim
56 words
Foamed materials, having density between 0.2 and 0.4 g/cm 3 comprising a mixture having melting index (at 230° C., 2.16 kg) between 0.001 and 600 kg/10' consisting of: A) 3-75% by weight of cross-linked polypropylene; B) 97-25% by weight of non cross-linked polypropylene, having intrinsic viscosity in tetrahydronaphthalene at 135° C. between 0.50 and 1/3 dl/g.
References Cited (Backward Citations)
US4212787A
Cited
US4247652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |