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US4957974A Expired / Lapsed US ⏱️ 0.0 years remaining

Graft copolymers and blends thereof with polyolefins

Assignee: Rohm and Haas Co
•
Filing: 1989-03-01
•
Granted: 1990-09-18
•
Expires: 2009-03-01
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Abstract

Abstract A novel graft copolymer capable of imparting to a polyolefin when blended therewith high tensile modulus and high sag resistance without increasing melt viscosity, and a method of making the same. The graft copolymer is a polyolefin having a relatively high weight-average molecular weight methacrylate polymer grafted thereto. The graft copolymer is formed by dissolving or swelling a non-polar polyolefin in an inert hydrocarbon solvent, heating to dissolve the polyolefin, and while stirring the mixture, adding a methacrylate monomer, together with an initiator to produce a constant, low concentration of radicals, to form a graft copolymer with a high molecular weight polymer chain covalently bonded or grafted to the polyolefin backbone. The graft copolymer can be separated from the solvent, isolated by volatilizing the solvent, for example in a devolatilizing extruder, and extruded into a desired shape such as a sheet, tube or the like. This graft copolymer can be blended with a polyolefin matrix. The blend exhibits improved physical properties in the melt, upon cooling, and in the solid state, and is useful in cast and oriented films, solid extruded rod and profile, foamed rod, profile and sheet, blown bottles and the like. The graft copolymer further improves compatibility in a wide range of polymer blends.

Inventors

  • 👤 Casmir S. Ilenda
  • 👤 Newman Bortnick
  • 👤 Roger K. Graham
  • 👤 William J. Work

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 13:33
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/06; C08F; C08F255/00; C08F255/02; 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

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 178 words
A graft copolymer capable of imparting to a polyolefin when blended therewith a relatively high tensile modulus and high resistance to sagging without increasing melt viscosity, the copolymer comprising: (a) 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 (b) 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 178 words
A graft copolymer capable of imparting to a polyolefin when blended therewith a relatively high tensile modulus and high resistance to sagging without increasing melt viscosity, the copolymer comprising: (a) 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 (b) 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 3
Dependent Claim 23 words
A copolymer as claimed in claim 1 wherein the weight average molecular weight of the methacrylate chain is between about 30,000 and 150,000.
Claim 4
Dependent Claim 19 words
A copolymer as claimed in claim 1 wherein the molecular weight of the trunk is about 100,000 to 400,000.
Claim 5
Dependent Claim 17 words
A copolymer as claimed in claims 1, 3 or 5 wherein the methacrylic ester is methyl methacrylate.
Claim 6
Dependent Claim 16 words
A copolymer as claimed in claims 1, 3 or 5 wherein the polyolefin trunk is polypropylene.
Claim 7
Dependent Claim 25 words
A copolymer as claimed in claims 1, 3 or 5 wherein the polyolefin trunk is polypropylene and the methacrylate chain is a methyl methacrylate polymer.
Claim 8
Dependent Claim 13 words
The graft copolymer of claim 1 wherein the substituted alkyl group is alkylthioalkyl.
Claim 9
Dependent Claim 12 words
The graft copolymer of claim 7 wherein the alkylthioalkyl group is ethylthioethyl.

References Cited (Backward Citations)

US4595726A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-09-17 1994-03-19 1994-09-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-09-17 1998-03-19 1998-09-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-09-17 2002-03-19 2002-09-18 $7700.00 Window Closed / Lapsed

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