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US 2003/0211332 A1Published application
Method for protection of stone with substantially amorphous fluoropolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsWilliam Howard Tuminello, Robert Clayton Wheland
Life of this patent
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Abstract
This invention concerns the application of substantially amorphous fluoropolymer compositions to stone so as to protect the stone from the deleterious effects of water and pollution.
Claims15
A process for protecting stone comprising:
- contacting stone with a substantially amorphous fluoropolymer comprising
- (a) at least about 10 mole percent of repeat units of the formula
- —CF2—CF(CF3)— (I)
- derived from hexafluoropropylene;
- (b) 0 to 50 mole percent of repeat units of the formula
- —CF2—CF2— (II)
- derived from tetrafluoroethylene;
- and
- (c) about 10 to about 75 mol-% of repeat units selected from the group consisting of
- —CF2CFX—, —CH2—CHR—, —CH2CF2— (III)
- and mixtures thereof wherein X is H or perfluoroalkoxy having 1-20 carbons, and R is H, alkyl, alkoxy, perfluoroalkyl, F.
8 more elements
A composition comprising stone and a substantially amorphous fluoropolymer, the substantially amorphous fluoropolymer comprising:
- (a) at least about 10 mole percent of repeat units of the formula
- —CF2—CF(CF3)— (I)
- derived from hexafluoropropylene;
- (b) 0 to 50 mole percent of repeat units of the formula
- —CF2—CF2— (II)
- derived from tetrafluoroethylene;
- and
- (c) about 10 to about 75 mol-% of repeat units selected from the group consisting of
- —CF2CFX—, —CH2—CHR—, —CH2CF2— (III)
- and mixtures thereof wherein X is H or perfluoroalkoxy having 1-20 carbons, and R is H, alkyl, alkoxy, perfluoroalkyl, F.
7 more elements
Dependencies are inferred from the claim text.