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US5244976A Expired / Lapsed US ⏱️ 0.0 years remaining

Partially crosslinked polymer composition

Assignee: BASF SE
•
Filing: 1992-03-06
•
Granted: 1993-09-14
•
Expires: 2012-03-06
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Abstract

Abstract A partially crosslinked polymer composition having a melt flow index of from 0.1 to 50 g/10 min at 230° C. under a weight of 2.16 kg and comprising a) a polymer comprising from 25 to 95% by weight of polypropylene and 5 to 75% by weight of a propylene copolymer with copolymerized C 2 -C 10 -alk-1-enes, the comonomer content being from 1 to 45% by weight, based on the total polymer, b) an organosilane compound of the formula (I) A.sub.4-n SiR.sub.n (i) where A are identical or different acrylates or methacrylates or vinyl groups, R are identical or different C 1 -C 8 -alkoxy or C 1 -C 8 -acetoxy groups, and n is 1, 2 or 3, obtainable by reacting the polymer a) with the organosilane compound b) in the presence of a free-radical initiator and in the presence of a condensation catalyst at from 180° to 280° C., and at from 1 to 100 bar and at a mean residence time of the reaction mixture of from 0.2 to 10 minutes, has, in particular, high notched impact strength, increased puncture resistance and improved weld line strength.

Inventors

  • 👤 Sibylle Brosius
  • 👤 Klaus-Dieter Ruempler
  • 👤 Erhard Seiler
  • 👤 Susanne Hahn
  • 👤 Karl Huber
  • 👤 Rainer A. Werner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 13:17
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 169 words
A partially crosslinked polymer composition having a melt flow index of from 0.1 to 50 g/10 :min at 230° C. under a weight of 2.16 kg and comprising a) a polymer comprising from 25 to 95% by weight of polypropylene and 5 to 75% by weight of a propylene copolymer with copolymerized Cz-Cm-alk-1-enes, the comonomer content being from 1 to 45% by weight, based on the total polymer, b) an organosilane compound of the formula (I) A.sub.4-n SiR.sub.n (I) where A are identical or different acrylates or methacrylates or vinyl groups, R are identical or different C 1 -C 8 -alkoxy or C 1 -C 8 -acetoxy groups, and n is 1, 2 or 3, obtained by reacting the polymer a) with the organosilane compound b) in the presence of a free-radical initiator and in the presence of a condensation catalyst at from 180 to 280° C., at from 1 to 100 bar and at a mean residence time of the reaction mixture of from 0.2 to 10 minutes.
Claim 2
Dependent Claim 169 words
A partially crosslinked polymer composition having a melt flow index of from 0.1 to 50 g/10 :min at 230° C. under a weight of 2.16 kg and comprising a) a polymer comprising from 25 to 95% by weight of polypropylene and 5 to 75% by weight of a propylene copolymer with copolymerized Cz-Cm-alk-1-enes, the comonomer content being from 1 to 45% by weight, based on the total polymer, b) an organosilane compound of the formula (I) A.sub.4-n SiR.sub.n (I) where A are identical or different acrylates or methacrylates or vinyl groups, R are identical or different C 1 -C 8 -alkoxy or C 1 -C 8 -acetoxy groups, and n is 1, 2 or 3, obtained by reacting the polymer a) with the organosilane compound b) in the presence of a free-radical initiator and in the presence of a condensation catalyst at from 180 to 280° C., at from 1 to 100 bar and at a mean residence time of the reaction mixture of from 0.2 to 10 minutes.
Claim 3
Dependent Claim 56 words
A partially crosslinked polymer composition as claimed in claim 1, where 0.1 to 5 parts per weight of the organosilane compound b), from 0.001 to 2 parts by weight of the free-radical initiator and from 0.001 to 0.1 part by weight of the condensation catalyst are used per 100 parts by weight of the polymer a).
Claim 4
Dependent Claim 33 words
A partially crosslinked polymer composition as claimed in claim 1, where the polymer a) comprises from 35 to 90% by weight of polypropylene and from 10 to by weight of a propylene copolymer.
Claim 5
Dependent Claim 25 words
A partially crosslinked polymer composition as claimed in claim 1, in whose organosilane compound H is C 1 -C 8 -alkoxy and n is 3.
Claim 6
Dependent Claim 50 words
A process for the preparation of a partially crosslinked polymer composition as claimed in claim 1, which comprises adding the organosilane compound b) and the free-radical initiator and the condensation catalyst to the polymer a) immediately after preparation of the latter, in a mixing apparatus connected to the preparation reactor.

References Cited (Backward Citations)

US3646155A Cited
GB1408154A Cited
GB1406680A Cited
US4160072A Cited
US4652326A Cited
EP0412518A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-09-13 1997-03-15 1997-09-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-09-13 2001-03-15 2001-09-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-09-13 2005-03-15 2005-09-14 $7700.00 Window Closed / Lapsed

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