Re-usable cement forms
AssigneeEastman Chemical Company
InventorsWilliam D. Maag, Joey C. Carico
Life of this patent
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Abstract
This invention relates to a panel of material comprising a film comprising a layer of a solid polyolefin and a layer of copolyester wherein said copolyester comprises: (1) a dicarboxylic acid component comprising repeat units from at least 90 mole percent terephthalic acid; and (2) a diol component comprising repeat units from 20 to 40 mole percent diethylene glycol and 80 to 60 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol, said layer of a copolyester being intimately bonded to a wooden substrate and said polyolefin layer being exposed on the outer surface of said film.
Claims15
A panel of material comprising a film comprising a layer of a solid polyolefin and a layer of copolyester wherein said copolyester comprises:
- (1) a dicarboxylic acid component comprising repeat units from at least 90 mole percent terephthalic acid;
- and
- (2) a diol component comprising repeat units from 20 to 40 mole percent diethylene glycol and 80 to 60 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol,
- said layer of a copolyester being intimately bonded to a wooden substrate and said polyolefin layer being exposed on the outer surface of said film.
A method for the formation of a concrete structure comprising the steps of erecting and securing a form for said structure, said form consisting essentially of wooden panels coated with a film comprising layer of a solid polyolefin and a layer of a copolyester wherein said polyolefin layer is on the side adjacent to the concrete to be poured, pouring concrete into the form, allowing the concrete to cure and then removing the form from the cured concrete, wherein said copolyester comprises:
- (1) a dicarboxylic acid component comprising repeat units from at least 90 mole percent terephthalic acid;
- and
- (2) a diol component comprising repeat units from 20 to 40 mole percent diethylene glycol and 80 to 60 mole percent ethylene glycol,
- based on 100 mole percent dicarboxylic acid and 100 mole percent diol.
Dependencies are inferred from the claim text.