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US5202380A Expired / Lapsed US ⏱️ 0.0 years remaining

Polyolefin compositions with improved impact strength

Assignee: Rohm and Haas Co
•
Filing: 1992-06-24
•
Granted: 1993-04-13
•
Expires: 2012-06-24
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Abstract

Abstract The addition of a polyolefin-acrylic graft copolymer to blends of polyolefin and core-shell polymers improves compatibility and allows core-shell polymers to be used as processing and performance modifiers polyolefins. Generally the compatibilizing additive is a graft copolymer of a polyolefin and a methacrylate. More specifically, the graft copolymer is derived from at least about 80% of a monomer of a methacrylic ester of the formula CH 2 ═C(CH 3 )COOR, where R may be alkyl, aryl, or aralkyl, substituted or unsubstituted, and less than 20%, based on a total monomer weight, of an acrylic or styrenic monomer copolymerizable with the methacrylic ester grafted on to a non polar polyolefin trunk, so that at least one chain is a polymer with a weight average molecular weight greater than about 20,000 and is present in a weight ratio with the polyolefin trunk of from about 1:9 to about 4:1. A typical composition may contain about 20% core-shell modifier, about 10% compatibilizer, the balance being polyolefin.

Inventors

  • 👤 Casmir S. Ilenda
  • 👤 David L. Dunkelberger
  • 👤 Dennis J. Labanoski

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 17:25
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/06; C08F; C08F255/00; C08F255/02; C08F255/06; C08L23/00; C08L23/02; C08L23/10; C08L2205/00; C08L2205/08; C08L25/00; C08L25/02; C08L25/04; C08L27/00; C08L27/02; C08L27/04; C08L67/00; C08L77/00; Y; Y10; Y10S; Y10S525/00; Y10S525/902

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 181 words
A polymeric blend which when added to a polyolefin improves the impact strength thereof, comprising a blend of an acrylic core-shell polymer and a copolymeric compatibilizer, wherein said compatibilizer is comprised of: (i) a non-polar polyolefin trunk selected from the group consisting of polyethylene, polypropylene, polybutylene, poly(4-methylpentene), copolymers of said olefins with each other, and one or more copolymers of said olefins with minor amounts of 1-alkenes, vinyl esters, vinyl chloride, (meth)acrylic ester, and (meth)acrylic acid, said trunk having a Mw of between about 50,000 and 1,000,000; and (ii) at least one methacrylate chain grafted with a covalent bond to said trunk having a weight ratio with said trunk of from about 1:9 to about 4:1, said chain being a polymer derived from at least about 80% of a monomer of a methacrylic ester of the formula CH 2 ═C(CH 3 )COOR, where R is alkyl, aryl, substituted alkyl, substituted aryl, or substituted alkaryl, and less than about 20% of an acrylic or styrenic monomer copolymerizable with the methacrylic ester, said chain having a Mw of from about 20,000 to 200,000.
Claim 2
Dependent Claim 181 words
A polymeric blend which when added to a polyolefin improves the impact strength thereof, comprising a blend of an acrylic core-shell polymer and a copolymeric compatibilizer, wherein said compatibilizer is comprised of: (i) a non-polar polyolefin trunk selected from the group consisting of polyethylene, polypropylene, polybutylene, poly(4-methylpentene), copolymers of said olefins with each other, and one or more copolymers of said olefins with minor amounts of 1-alkenes, vinyl esters, vinyl chloride, (meth)acrylic ester, and (meth)acrylic acid, said trunk having a Mw of between about 50,000 and 1,000,000; and (ii) at least one methacrylate chain grafted with a covalent bond to said trunk having a weight ratio with said trunk of from about 1:9 to about 4:1, said chain being a polymer derived from at least about 80% of a monomer of a methacrylic ester of the formula CH 2 ═C(CH 3 )COOR, where R is alkyl, aryl, substituted alkyl, substituted aryl, or substituted alkaryl, and less than about 20% of an acrylic or styrenic monomer copolymerizable with the methacrylic ester, said chain having a Mw of from about 20,000 to 200,000.

References Cited (Backward Citations)

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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) 1996-04-12 1996-10-12 1997-04-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-04-12 2000-10-12 2001-04-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-04-12 2004-10-12 2005-04-13 $7700.00 Window Closed / Lapsed

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