EP0374804A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for protecting stony materials, marble, tiles and cement from atmospheric agents and pollutants
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1989-12-18
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Granted: —
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Expires: 2009-12-18
Abstract
Abstract The present invention relates to a process for protecting stony materials, marble, tiles and cement as well as articles manufactured from said materials from the decay caused by the atmospheric agents and pollutants. For that purpose, a mixture comprising: 1) polytetrafluoroethylene in the form of an aqueous dispersion, 2) an emulsion or microemulsion of certain (per)fluoropolyethers is applied onto the surface of said materials or articles.
Inventors
- 👤 Giovanni Moggi
- 👤 Daria Lenti
- 👤 Desiderata Ingoglia
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/48; C04B41/4838; C04B41/4842; C04B41/4846; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C09D127/18; B; B27; B27K; B27K3/00; B27K3/02; B27K3/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A process for protecting marble, stones, tiles, cement, gypsums, wood and other related materials utilized in particular in the building industry from the destructive action of atmospheric agents and pollutants, by applying onto said materials a protective agent comprising a mixture of: a) an aqueous dispersion of a tetrafluoroethylene homopolymer and/or a tetrafluoroethylene copolymer containing up to 12% by moles of other perfluorinated monomers; and b) an aqueous emulsion or microemulsion of a (per)fluoropolyether comprising sequences of one or more of the following fluorooxyalkylene units: (CF₂CF₂CH₂O); having an average molecular weight of from about 1,000 to about 10,000 and having perfluoroalkyl end groups and/or end groups containing functional groups capable of forming physical and/or chemical bonds, particularly of the coordinative or charge-transfer type, with the material to be protected.
Claim 2
Dependent Claim
129 words
A process for protecting marble, stones, tiles, cement, gypsums, wood and other related materials utilized in particular in the building industry from the destructive action of atmospheric agents and pollutants, by applying onto said materials a protective agent comprising a mixture of: a) an aqueous dispersion of a tetrafluoroethylene homopolymer and/or a tetrafluoroethylene copolymer containing up to 12% by moles of other perfluorinated monomers; and b) an aqueous emulsion or microemulsion of a (per)fluoropolyether comprising sequences of one or more of the following fluorooxyalkylene units: (CF₂CF₂CH₂O); having an average molecular weight of from about 1,000 to about 10,000 and having perfluoroalkyl end groups and/or end groups containing functional groups capable of forming physical and/or chemical bonds, particularly of the coordinative or charge-transfer type, with the material to be protected.
Claim 3
Dependent Claim
53 words
The process of claim 1, wherein the (per)fluoropolyether has functional groups selected from -COOH, -CH₂OH, polyoxyalkylene-OH, quaternary ammonium groups, -C(OH)₂-CF₃, -CONR²R³, -CONHR⁹, -CONH₂ and -COOR⁴, wherein R² and R³, the same or different from each other, represent alkyl groups; R⁴ is an alkyl, aromatic or alkyl-aromatic group and R⁹ is an alkyl group.
Claim 4
Dependent Claim
12 words
The process according to claim 2, wherein the -COOH groups are salified.
Claim 5
Dependent Claim
99 words
The process of any one of claims 1 to 3, wherein use is made of one or more (per)fluoropolyethers of the following general formulae: a) b) R f O(CF₂CF₂O) n (CF₂O) m R′ f e) R f O(CF₂CF₂O) n R′ f f) R f O(CF₂CF₂CF₂O) n R′ f or R f O(CH₂CF₂CF₂O) n R′ f wherein n, m, p and o have values such that the molecular weight is within the range indicated in claim 1 and R f and R′ f are C₁₋₃-perfluoroalkyl and/or end groups containing functional groups of the type defined in claims 1 and 2.
Claim 6
Dependent Claim
22 words
The process of any one of claims 1 to 4 wherein the (per)fluoropolyether is employed in the form of an aqueous microemulsion.
Claim 7
Dependent Claim
59 words
A composition for protecting marble, stones, tiles, cement, gypsum, wood and related materials, comprising a mixture of a) an aqueous dispersion of a tetrafluoroethylene homopolymer or a tetrafluoroethylene copolymer containing up to 12% by moles of other perfluorinated monomers; and b) an aqueous emulsion or microemulsion of a (per)fluoropolyether as defined in any one of claims 1 to 4.
Claim 8
Dependent Claim
42 words
The composition of claim 6, wherein the polytetrafluoroethylene polymer is present, calculated as dry PTFE, in amounts of from about 2 to 60% by weight, particularly about 5 to about 20% by weight, with respect to the total weight of the (per)fluoropolyethers.
References Cited (Backward Citations)
No citation records indexed.
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