Compositions, processes for making, and articles of polyolefins, high density polyethylene and hydrocarbon resin
AssigneeEastman Chemical Company
InventorDaniel W. Klosiewicz
Life of this patent
Estimating the term…
Abstract
Masterbatches comprising high density polyethylene (HDPE) are used for the production of polyolefin articles, particularly films. Employing HDPE in a masterbatch alone or in combination with a hydrocarbon resin and/or a polyolefin ultimately results in extruded polyolefin articles of optimal stiffness and ductility. Employing a high density polyethylene in combination with a hydrocarbon resin and a polyolefin in a masterbatch causes the masterbatch to solidify more rapidly and be pelletized more efficiently.
Claims28
A process for producing a polypropylene article comprising:
- providing a masterbatch comprising a mixture of high density polyethylene and at least one member selected from the group consisting of polyolefin and hydrocarbon resin having a ring and ball softening point of at least about 70° C., the masterbatch having about 10-90 wt % of high density polyethylene;
- mixing said masterbatch with stereoregular polypropylene to form a polypropylene blend having about 0.3 wt % to 4.0 wt % of the high density polyethylene and from 0 wt % to about 5 wt % of hydrocarbon resin;
- extruding the blend to form the polypropylene article;
- and
- wherein the masterbatch is pelletized prior to mixing with the stereoregular polypropylene to form the polypropylene blend.
A process for producing a polypropylene article comprising:
- providing a masterbatch comprising a mixture of high density polyethylene and at least one member selected from the group consisting of polyolefin and hydrocarbon resin having a ring and ball softening point of at least about 70° C., the masterbatch having about 10-90 wt % of high density polyethylene;
- mixing said masterbatch with stereoregular polypropylene to form a polypropylene blend having about 0.3 wt % to 4.0 wt % of the high density polyethylene and from 0 wt % to about 5 wt % of hydrocarbon resin;
- extruding the blend to form the polypropylene article;
- and
- wherein the masterbatch is melt blended and pelletized prior to mixing with the stereoregular polypropylene to form the polypropylene blend.
An article produced by providing a masterbatch comprising a mixture of high density polyethylene and at least one member selected from the group consisting of polyolefin and hydrocarbon resin having a ring and ball softening point of at least about 70° C., the masterbatch having about 10-90 wt % of high density polyethylene;
- mixing said masterbatch with stereoregular polypropylene to form a polypropylene blend having about 0.3 wt % to 4.0 wt % of the high density polyethylene and from 0 wt % to about 5 wt % of hydrocarbon resin;
- extruding the blend to form the article.
A film produced by providing a masterbatch comprising a mixture of high density polyethylene and at least one member selected from the group consisting of polyolefin and hydrocarbon resin having a ring and ball softening point of at least about 70° C., the masterbatch having about 10-90 wt % of high density polyethylene;
- mixing said masterbatch with stereoregular polypropylene to form a polypropylene blend having about 0.3 wt % to 4.0 wt % of the high density polyethylene and from 0 wt % to about 5 wt % of hydrocarbon resin;
- extruding the blend to form the film.
A modified polyolefin composition comprising:
- a semi-crystalline polyolefin comprising a polymer comprised of alpha-olefin monomers containing about 2 to 8 carbon atoms and about 0.3 wt. % to 4.0 wt. % of a high density polyethylene and from 0 wt. % up to about 5 wt. % of a hydrocarbon resin having a ring and ball softening point of at least 70° C.
Dependencies are inferred from the claim text.