EP0252134A1 - Compositions d'enduction contenant du fluorure de polyvinyl - Google Patents

Compositions d'enduction contenant du fluorure de polyvinyl

Info

Publication number
EP0252134A1
EP0252134A1 EP19870900665 EP87900665A EP0252134A1 EP 0252134 A1 EP0252134 A1 EP 0252134A1 EP 19870900665 EP19870900665 EP 19870900665 EP 87900665 A EP87900665 A EP 87900665A EP 0252134 A1 EP0252134 A1 EP 0252134A1
Authority
EP
European Patent Office
Prior art keywords
composition according
polyvinyl fluoride
organic liquid
fluorinated
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19870900665
Other languages
German (de)
English (en)
Inventor
William Gerard Anthony O'donnell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plascoat Systems Ltd
Original Assignee
Plascoat UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB868600380A external-priority patent/GB8600380D0/en
Priority claimed from GB868619583A external-priority patent/GB8619583D0/en
Application filed by Plascoat UK Ltd filed Critical Plascoat UK Ltd
Publication of EP0252134A1 publication Critical patent/EP0252134A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
    • C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C09D127/14—Homopolymers or copolymers of vinyl fluoride

Definitions

  • This invention relates to coating compositions having a basis of a fluorinated polymer comprising polyvinyl fluoride as a major component.
  • PVF polyvinyl fluoride
  • polyvinylidene fluoride has generally been used rather than polyvinyl fluoride, the polyvinylidene fluoride being used in conjunction with 20 to 50% of an acrylic resin.
  • the present invention consists in a liquid coating composition comprising:
  • a fluorinated polymer resin in particulate form comprising at least 50 wt. % of polyvinyl fluoride;
  • an organometallic stabilizer containing at least one metal selected from tin, antimony, barium, cadmium, zinc and calcium the polyvinyl fluoride resin used in the present compositi can be used in conjunction with up to 50 wt.% of another fluorinated resin such as polytetrafluoroethylene or polyvinyli ⁇ dene fluoride.
  • the fluorinated resins can be of any convenient molecular weight but should be capable of undergoing at least some solvation at elevated temperature by an organic liquid such as a lower alkylene carbonate.
  • a lower alkylene carbonate may conveniently be a carbonate in which the alkylene group has not more than six carbon atoms.
  • organic liquids are however suitable including n-methyl pyrrolidone, tri-ethyl phosphate and dimethyl acrylamide.
  • the fluorinated polymer resin and the organic liquid which has an elevated temperature solvating action are the main ingredients of the coating compositions of the present invention but other ingredients are also essential to achieve specific performance requirements.
  • a characteristic of polyvinyl fluoride resin dispersions is an extremely high degree of pseudo-plasticity which derives from the electro- chemical activity of the particles. It has been found however that the incorporation of a fluorinated surfactant, typically a nonionic surfactant, is effective in reducing pseudo- plasticity. This effect is sufficiently marked as to eliminate the rheological problems otherwise encountered in applying the liquid paint to a steel substrate using conventional reverse-role coating techniques. Such an additive does not cause any undue deterioration in coating properties and has also been found to enhance the gloss of the finished coated sheet.
  • One fluorinated surfactant which has been found particularly suitable is a nonionic surfactant comprising a mixture of fluorinated alkyl esters which can be obtained from 3M's Manufacturing Co., under the trade mark Fluorad FC 4
  • a further difficulty in formulating a polyvinyl fluoride based coating material lies in the interactions which can occur between traces of fluorine or hydrogen fluoride evolved from the resin and the pigments involved.
  • brown or pink discolourations can arise from the use of the titanium dioxide pigments present in white or light coloured materials.
  • organometallic stabilizers based on Sn, Sb, Cd, Ba Zn and/or Ca have been tested and found to be effective in overcoming this difficulty to a greater or lesser degree.
  • Organotin and organoanti ony stabilizers have been found to be suitable, particularly organotin mercaptides, and carboxylates .
  • Systems based on barium/cadmium, barium/zinc or calcium/zinc can also be used, as can barium and cadmium salts of carboxylic acids or phenols or mixtures of any of the above.
  • the organic liquid used as a plasticiser may be diluted with another organic liquid miscible therewith but inert towards the other ingredients of the composition.
  • Suitable liquids include the mono esters of dialkylene glycol alkyl ethers such as diethylene glycol mono-n-butyl ether acetate.
  • the compositions are conveniently prepared by blending the ingredients in a high shear mixer. In order further to control the rheological properties of the material it has been found effective to subject either the whole or some part of the production quantity to a heat treatment step. This involves heating to a pre-determined temperature for a pre-determined time whilst ensuring that the liquid is continuously and uniformly agitated.
  • This process can conveniently be carried out in a vessel with an effective means of stirring, jacketed for heating purposes and equipped with a refluxing system.
  • the heating step is best carried out in the presence of all or part of the fluorinated surfac ⁇ tant additive previously referred to and the conditions applied depend on the solvent system used and the required viscosity/shear dependence. Pigments dispersions, residual fluorinated additive and any untreated portion of the liquid are best added in a low shear mixing step subsequent to cooling after the heat treatment stage.
  • compositions of the present invention can be applied to a primed substrate by conventional methods.
  • the preferred primer is either one based on a polyvinyl fluoride organosol or is of the acrylic/epoxy or phenolic/epoxy type. It is preferable for the primer system to incorporate a corrosion preventing additive such as zinc chromate- and additionally some metallic oxide such as magnesium oxide. .
  • a corrosion preventing additive such as zinc chromate- and additionally some metallic oxide such as magnesium oxide.
  • PVF resin dispersion was made up as follows:
  • a galvanized steel sheet substrate having a thickness of 0.7 mm was chemically passivated and coated to a thickness of 5 ⁇ *-- ⁇ . with an epoxyphenol acrylic primer including a corrosion-inhibiting pigment.
  • the PVF resin dispersion was then applied to the primed substrate and cured under conditions giving a peak metal temperature of 215°C to give a smooth, well adhered and tough coating having a thickness of 25lun.
  • the coating had good abrasion resistance and there was no evidence of discolouration.
  • the coating was capable of withstanding a Zero T bend.
  • the coated substrate was subjected to a salt spray test according to ASTM B117 (1973). After 3000 hours the coating showed 5mm creep from a scribe mark.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Paints Or Removers (AREA)

Abstract

Une composition d'enduction liquide contient une résine de fluorure de polyvinyl. Cette résine est dispersée sous forme particulaire dans un liquide organique, de préférence un carbonate d'alcène inférieur possédant une action de solvatation latente sur elle, de concert avec un tensio-actif fluoré et un stabilisateur organométallique contenant au moins un métal sélectionné parmi l'étain, l'antimoine, le barium, le cadmium, le zinc et le calcium. Cette composition permet l'application de revêtements à base de fluorure de polyvinyl par des procédés d'enduction liquide classiques plutôt que par laminage sous forme de film utilié jusqu'à présent.
EP19870900665 1986-01-08 1987-01-07 Compositions d'enduction contenant du fluorure de polyvinyl Withdrawn EP0252134A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8600380 1986-01-08
GB868600380A GB8600380D0 (en) 1986-01-08 1986-01-08 Coating compositions
GB8619583 1986-08-12
GB868619583A GB8619583D0 (en) 1986-08-12 1986-08-12 Coating compositions

Publications (1)

Publication Number Publication Date
EP0252134A1 true EP0252134A1 (fr) 1988-01-13

Family

ID=26290186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900665 Withdrawn EP0252134A1 (fr) 1986-01-08 1987-01-07 Compositions d'enduction contenant du fluorure de polyvinyl

Country Status (3)

Country Link
EP (1) EP0252134A1 (fr)
AU (1) AU6845787A (fr)
WO (1) WO1987004176A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR910004817B1 (ko) * 1987-07-31 1991-07-13 니혼유시 가부시기가이샤 열경화성분체도료조성물

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3360396A (en) * 1964-05-25 1967-12-26 Diamond Alkali Co Polyvinyl fluoride coating
US3429844A (en) * 1966-02-11 1969-02-25 Diamond Shamrock Corp Stabilization of polyvinyl fluoride

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8704176A1 *

Also Published As

Publication number Publication date
AU6845787A (en) 1987-07-28
WO1987004176A1 (fr) 1987-07-16

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Legal Events

Date Code Title Description
ITCL It: translation for ep claims filed

Representative=s name: SOCIETA' ITALIANA BREVETTI S.P.A.

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19880107

17Q First examination report despatched

Effective date: 19890502

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19891114

RIN1 Information on inventor provided before grant (corrected)

Inventor name: O'DONNELL, WILLIAM, GERARD, ANTHONY