Coated biaxially oriented film via in-line coating process
OwnerPang-Chia Lu, Brad M. Moncla +1inventors
InventorsPang-Chia Lu, Brad M. Moncla, Matthew J. Kalinowski
Life of this patent
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Abstract
Methods for producing a coated biaxially oriented film and films made therefrom. An illustrative method can include orienting a base film in a first direction to provide an uniaxially oriented film; coating at least a portion of the uniaxially oriented film with a polyolefin dispersion to produce a coated uniaxially oriented film; and orienting the coated uniaxially oriented film in a second direction at a temperature sufficient to stretch and anneal the coated film to provide a coated biaxially oriented film having greater than 80% gloss.
Claims40
A method for producing a coated biaxially oriented film consisting of:
- orienting a base polypropylene film with a skin layer in a first direction to provide an uniaxially oriented polypropylene film;
- coating, in-line with orienting in a second direction, at least a portion of the uniaxially oriented polypropylene film on the skin layer with a polyolefin dispersion to produce a coated uniaxially oriented film, wherein the polyolefin dispersion is an ethylene/1-octene copolymer blended with up to 3.6 parts by weight of a fatty acid;
- and
- orienting the coated uniaxially oriented film in the second direction at a temperature sufficient to stretch and anneal the coated uniaxially oriented film so as to provide a coated biaxially oriented film having greater than 80% gloss and a Haze of less than 5%, wherein a temperature for orienting in the second direction is greater than the melting temperature of the ethylene/1-octene copolymer;
- wherein the coated biaxially oriented film produced therefrom can be heat sealed to at least a portion of itself or at least a portion of another film at a heat seal temperature of less than 80° C.
A method for producing a coated biaxially oriented film, consisting of:
- orienting an untreated polypropylene base film with a skin layer in a first direction and at a first temperature to provide an untreated uniaxially oriented polypropylene film;
- wherein the untreated polypropylene base film with a skin layer comprises at least one skin layer on a first side of a polypropylene core layer and at least one skin layer on a second side of the polypropylene core layer, the base film oriented;
- coating, in-line with orienting in a second direction, at least a portion of the untreated uniaxially oriented polypropylene film on a skin layer with a polyolefin dispersion to produce a coated uniaxially oriented film, wherein the polyolefin dispersion is an ethylene/1-octene copolymer blended with up to 3.6 parts by weight of a fatty acid, the polyolefin dispersion having an average particle size within the range of from about 2.3 microns to 5.2 microns;
- and
- orienting the coated uniaxially oriented film in the second direction and at a second temperature sufficient to stretch and anneal the coated uniaxially oriented film so as to provide a coated biaxially oriented film having greater than 80% gloss and a Haze of less than 5%, wherein the second temperature is greater than the first temperature and greater than the melting temperature of the ethylene/1-octene copolymer in the polyolefin dispersion;
- wherein the coated biaxially oriented film produced therefrom can be heat sealed to at least a portion of itself or at least a portion of another film at a heat seal temperature of less than 80° C.
Dependencies are inferred from the claim text.