WO2018032410A1 - Benzophenone derivative, aqueous copolymer dispersion and aqueous coating composition - Google Patents

Benzophenone derivative, aqueous copolymer dispersion and aqueous coating composition Download PDF

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Publication number
WO2018032410A1
WO2018032410A1 PCT/CN2016/095677 CN2016095677W WO2018032410A1 WO 2018032410 A1 WO2018032410 A1 WO 2018032410A1 CN 2016095677 W CN2016095677 W CN 2016095677W WO 2018032410 A1 WO2018032410 A1 WO 2018032410A1
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WO
WIPO (PCT)
Prior art keywords
aqueous
copolymer
coating composition
aqueous coating
benzophenone
Prior art date
Application number
PCT/CN2016/095677
Other languages
French (fr)
Inventor
Yujiang Wang
Hui Liu
Caifeng WANG
Jianming Xu
Ling Li
Alvin Michael Maurice
Hongyu Chen
Original Assignee
Dow Global Technologies Llc
Rohm And Haas Company
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
Application filed by Dow Global Technologies Llc, Rohm And Haas Company filed Critical Dow Global Technologies Llc
Priority to KR1020197006175A priority Critical patent/KR102199576B1/en
Priority to CN201680088194.2A priority patent/CN109601001B/en
Priority to BR112019002448-4A priority patent/BR112019002448B1/en
Priority to US16/317,860 priority patent/US11292889B2/en
Priority to EP16913170.3A priority patent/EP3500634B1/en
Priority to CA3033453A priority patent/CA3033453C/en
Priority to PCT/CN2016/095677 priority patent/WO2018032410A1/en
Priority to AU2016420190A priority patent/AU2016420190B2/en
Publication of WO2018032410A1 publication Critical patent/WO2018032410A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C217/00—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton
    • C07C217/78—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton
    • C07C217/80—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings
    • C07C217/82—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings of the same non-condensed six-membered aromatic ring
    • C07C217/90—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings of the same non-condensed six-membered aromatic ring the oxygen atom of at least one of the etherified hydroxy groups being further bound to a carbon atom of a six-membered aromatic ring, e.g. amino-diphenylethers
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/76—Ketones containing a keto group bound to a six-membered aromatic ring
    • C07C49/782—Ketones containing a keto group bound to a six-membered aromatic ring polycyclic
    • C07C49/784—Ketones containing a keto group bound to a six-membered aromatic ring polycyclic with all keto groups bound to a non-condensed ring
    • C07C49/786—Benzophenone
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C09D145/00—Coating compositions based on homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic system; Coating compositions based on derivatives of such polymers
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/50—Aqueous dispersion, e.g. containing polymers with a glass transition temperature (Tg) above 20°C
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/52—Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C

Definitions

  • the present invention relates to a benzophenone derivative, and an aqueous copolymer dispersion comprising the benzophenone derivative.
  • This invention also relates to an aqueous coating composition comprising the aqueous copolymer dispersion.
  • Dirt pick up resistance (DPUR) of a coating is the ability to minimize accumulation of dirt, dust, soot and other such materials on the surface of the coating.
  • a coating with poor DPUR performance usually has an unclean and darkened appearance.
  • a conventional approach to improve the DPUR performance of coatings is by using benzophenone as a photo initiator in coating applications.
  • UV ultraviolet
  • benzophenone photochemistry which is UV light-induced crosslinking reactions of polymers.
  • This conventional approach may exploit sunlight as a UV sources at low cost.
  • Benzophenone is less effective in improving DPUR performance over a long period of time.
  • the crosslinking effect caused by benzophenone photochemistry will also be heavily reduced in rainy conditions during applications.
  • Coating film surfaces are susceptible to cracking due to over crosslinking caused by high dosing levels of benzophenone. Benzophenone easily sublimates, which may lead to volatile organic compounds (VOC) emission.
  • VOC volatile organic compounds
  • benzophenone derivatives are used as light stabilizing additives in combination with benzophenone.
  • VOC emission remains a concern.
  • the present invention provides a benzophenone derivative represented by the following Formula A:
  • R 1 and R 2 are each independently hydrogen, alkyl or a substituted alkyl group, and R 3 is hydrogen or has a structure of Formula B:
  • R 4 and R 5 are independently hydrogen, alkyl, or a substituted alkyl group.
  • the present invention provides an aqueous copolymer dispersion comprising (a) an aqueous emulsion copolymer, wherein the aqueous emulsion copolymer comprises, as copolymerized units, at least 90%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer; and up to 10%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer; and (b) from 0.05%to 3%by weight, based on the dry weight of the copolymer, of the benzophenone derivative of the first aspect.
  • the present invention provides an aqueous coating composition comprising the aqueous copolymer dispersion of the second aspect.
  • R 1 and R 2 are each independently hydrogen, alkyl or a substituted alkyl group, and R 3 is hydrogen or has a structure of Formula B:
  • R 4 and R 5 are independently hydrogen, alkyl, or a substituted alkyl group.
  • the benzophenone derivative of the present invention may be prepared by a conventional substitution reaction.
  • the benzophenone derivative may be synthesized by reacting 4-hydroxyaniliane with 4-chloro benzophenone or 4, 4’ -dichloro benzophenone in the presence of one or more strong base catalyst at a temperature of from about 120°C (degree Celsius) to 180°C.
  • a strong base catalyst is an inorganic hydroxide. Examples of suitable strong base catalysts include sodium hydroxide, potassium hydroxide; or combinations thereof. Preferably, the strong base catalyst is sodium hydroxide.
  • the aqueous copolymer dispersion comprises:
  • an aqueous emulsion copolymer wherein the aqueous emulsion copolymer comprises, as copolymerized units, at least 90%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer; and up to 10%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer;
  • the ethylenically unsaturated nonionic monomers include, for example, (meth) acrylic ester monomers, wherein “ (meth) acrylic ester” designates methacrylic ester or acrylic ester, including methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, methyl methacrylate, butyl methacrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate; (meth) acrylonitrile; amino-functional and ureido-functional monomers; monomers carrying alkoxysilane functionality; monomers bearing acetoacetate-functional groups; styrene and substituted
  • the stabilizer monomer includes, for example, a, ⁇ -monoethylenically unsaturated carboxylic acids of from 3 to 8 carbon atoms, anhydrides and amides.
  • the a, ⁇ -monoethylenically unsaturated carboxylic acid monomers include, for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid and salts or anhydrides thereof, and the amides of these acids, particularly acrylamide and methacrylamide; and combinations thereof.
  • the stabilizer monomer further includes sulfur-containing or phosphor-containing acidic monomer.
  • the aqueous emulsion copolymer may further comprise up to 5%, preferably up to 3%, more preferably up to 2%by weight, based on the dry weight of the copolymer, of copolymerized multi-ethylenically unsaturated monomers, for example, allyl methacrylate, diallyl phthalate, 1, 4-butylene glycol dimethacrylate, 1, 2-ethylene glycol dimethacrylate, 1, 6-hexanediol diacrylate, or divinyl benzene; or combinations thereof.
  • the aqueous emulsion copolymer has a glass transition temperature (Tg) of –70°C to +70°C, preferably from –40°C to +30°C.
  • Tg glass transition temperature
  • Tg used herein are those calculated by using the Fox equation (T. G. Fox, Bull. American Physical Society, Volume 1, Issue No. 3, page 123 (1956) ) .
  • Tg the Tg of a copolymer of monomers M 1 and M 2 .
  • Tg (calc. ) is the glass transition temperature calculated for the copolymer
  • w (M 1 ) is the weight fraction of monomer M 1 in the copolymer
  • w (M 2 ) is the weight fraction of monomer M 2 in the copolymer
  • Tg (M 1 ) is the glass transition temperature of the homopolymer of M 1
  • Tg (M 2 ) is the glass transition temperature of the homopolymer of M 2 , all temperatures being in K.
  • the glass transition temperatures of homopolymers may be found, for example, in “Polymer Handbook” , Fourth edition edited by J. Brandrup, E. H. Immergut, and E. A. Grulke, Interscience Publishers, 1999.
  • the aqueous emulsion copolymer of the present invention may be prepared by polymerization techniques well known in the art. Either thermal or redox initiation processes may be used in the polymerization process. Conventional free radical initiators may be used such as hydrogen peroxide, t-butyl hydroperoxide, t-amyl hydroperoxide, ammonium and alkali persulfates, typically at a level of 0.01%to 3.0%by weight, based on the weight of total monomer.
  • Redox systems using the same initiators coupled with a suitable reductant such as sodium sulfoxylate formaldehyde, sodium hydrosulfite, isoascorbic acid, hydroxylamine sulfate and sodium bisulfite may be used at similar levels, optionally in combination with metal ions such as iron and copper, optionally further including complexing agents for the metal.
  • the monomer mixture may be added in a single addition or more additions or continuously over the reaction period using a uniform or varying composition. Additional ingredients such as oxidants, reducing agents, chain transfer agents, neutralizers, surfactants, and dispersants may be added prior to, during, or subsequent to the monomer addition.
  • the aqueous emulsion copolymer may be prepared by a multistage emulsion polymerization process, in which at least two stages differing in composition are polymerized in sequential fashion.
  • the polymerization techniques used to prepare such multistage emulsion polymers are well known in the art. Such a process sometimes results in the formation of at least two mutually incompatible polymer compositions, thereby resulting in the formation of at least two phases within the polymer particles.
  • Such particles are composed of two or more phases of various geometries or morphologies such as, for example, core/shell or core/sheath particles, core/shell particles with shell phases incompletely encapsulating the core, core/shell particles with a multiplicity of cores, and interpenetrating network particles. In all of these cases the majority of the surface area of the particle will be occupied by at least one outer phase and the interior of the particle will be occupied by at least one inner phase.
  • Each of the stages of the multi-staged emulsion polymer may contain the same monomers, surfactants, chain transfer agents, etc. as disclosed herein-above for the emulsion polymer.
  • the Tg for the purpose of this invention is to be calculated by the Fox equation as detailed herein using the overall composition of the emulsion polymer without regard for the number of stages or phases therein.
  • the amount of the monomers shall be determined from the overall composition of the emulsion polymer without regard for the number of stages or phases therein.
  • the average particle diameter of the aqueous emulsion copolymer particles is from 50 to 800 nanometers, preferably from 100 to 400 nanometers, as measured by a BI-90 Particle Sizer.
  • the aqueous coating composition comprises an aqueous copolymer dispersion comprising,
  • an aqueous emulsion copolymer wherein the emulsion copolymer comprises, as copolymerized units, at least 90%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer; and up to 10%by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer; and
  • the aqueous coating composition may further comprise at least one coating adjuvant.
  • the adjuvant herein refers to components in the coating except for the emulsion copolymer.
  • the adjuvant may comprise pigment.
  • suitable pigments include zinc oxide, antimony oxide, zirconium oxide, chromium oxide, iron oxide, lead oxide, zinc sulfide, lithopone, and titanium dioxide, for example, anatase and rutile titanium dioxide.
  • the aqueous copolymer dispersion optionally contains opaque polymer particles such as ROPAQUE TM opaque polymers available from Rohm and Haas Company, a wholly owned subsidiary of The Dow Chemical Company.
  • the adjuvant may comprise at least one extender.
  • suitable extenders include calcium carbonate, calcium sulfate, barium sulfate, mica, clay, calcined clay, feldspar, nepheline, syenite, wollastonite, diatomaceous earth, alumina silicates, non-film forming polymer particles having glass transition temperatures above 35°C, aluminum oxide, silica sol and talc.
  • the adjuvant may comprise colorant.
  • suitable colorants include inorganic colorant particles and organic colorant particles.
  • suitable inorganic colorant particles include, for example, iron oxides, chromium oxides, carbon black, and metal effect pigments such as aluminum, copper, copper oxide, bronze, stainless steel, nickel, zinc, and brass.
  • suitable organic colorant particles include, for example, azo pigments, phthalocyanine pigments, and quinacridone pigments.
  • rheology modifier coalescents, solvents, biocides, wetting agents, defoamers, dyes, humectants, waxes, surfactants, flatting agents, neutralizers, buffers, free-thaw additives, plasticizers, antifoaming agents, tackifiers, hindered amine light stabilizers, photoabsorbers, dispersants, and anti-oxidants.
  • the photoabsorbers can be combined with the aqueous copolymer dispersion or can be added to the aqueous coating composition subsequently. Suitable levels of photoabsorbers include from 0.1%to 7%by weight solids basis of the aqueous copolymer dispersion.
  • the amount of pigment and extender in the aqueous coating composition vary from a pigment volume concentration (PVC) of 0 to 85%and thereby encompass coatings otherwise described in the art, for example, clean coatings, flat coatings, satin coatings, semi-gloss coatings, gloss coatings, primers, textured coatings, and the like.
  • PVC pigment volume concentration
  • Preferable PVC is from 10%to 70%, more preferably PVC is from 10%to 60%.
  • the pigment volume concentration is calculated by the following formula:
  • the aqueous copolymer dispersion is to be pigmented, at least one pigment is dispersed in an aqueous medium, preferably using a high shearing mixing. Alternatively, at least one pre-dispersed pigment may be used. In one method, the aqueous copolymer dispersion is added to a pigment dispersion, either simultaneously or sequentially, by mixing under low shear stirring along with other adjuvants as desired, to provide a pigmented aqueous copolymer dispersion. Alternatively, pigment slurry may be prepared in the presence of the aqueous copolymer dispersion.
  • the solids content of the aqueous coating composition is typically in the range of from 25%to 60%by volume.
  • the viscosity of the aqueous coating composition is typically from 50KU (Krebs Units) to 140KU as measured by using a Brookfield Digital Viscometer KU-1. The viscosities appropriate for different application methods vary considerably.
  • the aqueous coating composition of the present invention may be prepared by techniques which are well known in the coatings art. Components in the aqueous coating composition may be mixed in any order to provide the aqueous coating composition of the present invention. Any of the above-mentioned optional components may also be added to the composition during or prior to the mixing to form the aqueous coating composition.
  • the process of using the aqueous coating composition of the present invention may comprise the following: applying the aqueous coating composition to a substrate, exposing the applied aqueous coating composition to UV light, and drying the applied aqueous coating composition or allowing it to dry.
  • the aqueous coating composition of the present invention can be applied to a substrate by known means such as brushing, dipping, rolling and spraying.
  • the coating composition is preferably applied by spraying.
  • the standard spray techniques and equipment for spraying such as air-atomized spray, air spray, airless spray, high volume low pressure spray, and electrostatic spray such as electrostatic bell application, and either manual or automatic methods can be used.
  • the aqueous coating composition of the present invention may be dried, or be allowed to dry, at a room temperature of from 21°C to 25°C, or at an elevated temperature, for example, from 35°C to 60°C to form a film.
  • the aqueous coating composition of the present invention can be applied to, and adhered to, various substrates.
  • suitable substrates include wood, metals, plastics, foams, stones, elastomeric substrates, glass, fabrics, or concrete.
  • the dry coating prepared from the aqueous coating composition may be used as a protective coating or an aesthetic coating.
  • suitable coatings include architectural coatings such as interior and exterior paint coatings, including masonry coatings, wood coating, cementious coatings and treatments; maintenance coatings such as metal coatings; paper coatings; and traffic coatings such as those coatings used to provide markings on roads, pavements, and runways.
  • the aqueous coating composition sample was coated on asbestos by using a drawdown roller stick to form a 120 micron-thick wet film as a first layer.
  • the coated asbestos was allowed to be cured in a consistent temperature room (23°C and 50%relative humidity) for 4 hours.
  • the aqueous coating composition sample was applied onto the first layer by using the drawdown roller stick to form an 80 micron-thick wet film as a second layer.
  • the coated asbestos was allowed to be cured in the consistent temperature room (23°C and 50%relative humidity) for 14 days.
  • the coated asbestos was exposed to a QUV accelerated weathering tester equipped with UVA-340nm lamps (QUV accelerated weathering tester: Model QUV/Spray; Irradiance 0.77W/m 2 /nm) for 1 hour, 2 hours or 4 hours.
  • QUV accelerated weathering tester Model QUV/Spray; Irradiance 0.77W/m 2 /nm
  • the DPUR level of the given aqueous coating composition sample is evaluated according to Item 5.4 (5.4.1.2 Method A) of the GB/T 9780-2013 standard:
  • the GB/T 9780-2013 standard herein is the national standard for Test method for dirt pickup resistance and stain removal of film of architectural coatings and paint, which was published by General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China (P. R. China) and Standardization Administration of the P. R. China, issued on November 27, 2013, and put into effect on August 1, 2014.
  • Inventive Benzophenone Derivative Compound A was synthesized via the following procedure. 21.6 grams of 4-chloro benzophenone, 11.99 grams of 4-hydroxyaniliane, 0.56 grams of potassium hydroxide were added into 100 milliliters (ml) of NMP sequentially in a 250-ml vessel. The vessel was heated to a temperature of from 150°C to 190°C for around 12 hours. Then, the mixture in the vessel was cooled to room temperature. The solvent NMP was removed from the mixture by distillation under a reduced-pressure condition. 100 ml of toluene was then added into the mixture. The mixture was then washed by using a 50-ml 5%NaCl solution. The toluene was removed from the mixture by distillation under a reduced-pressure condition after a toluene layer was formed. 26.0 grams of an intermediate was obtained.
  • Inventive Benzophenone Derivative Compound B was synthesized via the following procedure. 25.0 grams of 4, 4’ -dichloro benzophenone, 23.98 grams of 4-hydroxyaniliane, 0.56 grams of potassium hydroxide were added into 100 ml of NMP sequentially in a 250-ml vessel. The vessel was heated to a temperature of from 150°C to 190°C for around 12 hours. Then, the mixture in the vessel was cooled to room temperature. The solvent NMP was removed from the mixture by distillation under a reduced-pressure condition. 100 ml of toluene was then added into the mixture. The mixture was then washed by using a 50-ml 5%NaCl solution. The toluene was removed by distillation under a reduced-pressure condition after a toluene layer was formed. 35.0 grams of an intermediate was obtained.
  • Inventive Aqueous Copolymer Dispersion 1 A solution was made by blending 1 gram of Inventive Benzophenone Derivative Compound A with 500 grams of PRIMAL AC-261P binder under agitation.
  • Inventive Aqueous Copolymer Dispersions 2 to 4 were prepared by using the same procedure as outlined for Inventive Copolymer Dispersion 1, except for the amounts of different benzophenone derivatives and binders being used. The amounts of various components (in grams) to make Inventive Copolymer Dispersions 1 to 4 are shown in TABLE 4 below.
  • Comparative Aqueous Copolymer Dispersion 1 A solution was made by blending 1 gram of benzophenone with 500 grams of PRIMAL AC-261P binder under agitation.
  • Comparative Aqueous Copolymer Dispersion 2 A solution was made by blending 1 gram of benzophenone with 500 grams of ELASTENE 3808 binder under agitation.
  • Inventive Aqueous Coating Composition 1 was made with a 48VS/40PVC (VS: volume solids) formulation using Inventive Aqueous Copolymer Dispersion 1.
  • Grind Phase 150.0 grams of water, 15.0 grams of propylene glycol, 2.0 grams of NATROSOL 250 HBR thickener, 2.0 grams of AMP-95 base, 10.0 grams of OROTAN CA-2500 Dispersant, 2.0 grams of TRITON BD-109 wetting agent, 1.0 grams of NOPCO NXZ defoamer, 7.0 grams of ROCIMA 363 biocide, 150.0 grams of TI-PURE R-902 pigment, and 130.0 grams of CC-700 extender were added into a tank and stirred with a COWLES mixer under a high speed. The grind phase components were then well dispersed.
  • Inventive Aqueous Coating Compositions 2 to 4 and Comparative Compositions 1 and 2 were prepared by using the same procedure outlined for Inventive Aqueous Coating Composition 1, except for the amounts of different aqueous copolymer dispersion and TEXANOL coalescent used in the letdown phase.
  • the amounts of various aqueous copolymer dispersions and TEXANOL coalescent (in grams) used in the letdown phase for Inventive Aqueous Coating Compositions 2 to 4 and Comparative Compositions 1 and 2 are shown in TABLE 6 below.
  • a comparison of DPUR performance was made between aqueous coating compositions prepared using the inventive benzophenone derivatives and those prepared using the conventional benzophenone.
  • inventive Aqueous Coating Compositions 1 to 4 were made from the inventive benzophenone derivative; whereas Comparative Aqueous Coating Compositions 1 and 2 were made from the conventional benzophenone.

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  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
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Abstract

Provided are a benzophenone derivative, an aqueous copolymer dispersion comprising the benzophenone derivative and an aqueous coating composition comprising the aqueous copolymer dispersion. The benzophenone derivative provides better crosslinking efficiency and improvement to dirt pick up resistance performance.

Description

BENZOPHENONE DERIVATIVE, AQUEOUS COPOLYMER DISPERSION AND AQUEOUS COATING COMPOSITION FIELD OF THE INVENTION
The present invention relates to a benzophenone derivative, and an aqueous copolymer dispersion comprising the benzophenone derivative. This invention also relates to an aqueous coating composition comprising the aqueous copolymer dispersion.
BACKGROUND
Dirt pick up resistance (DPUR) of a coating is the ability to minimize accumulation of dirt, dust, soot and other such materials on the surface of the coating. A coating with poor DPUR performance usually has an unclean and darkened appearance.
A conventional approach to improve the DPUR performance of coatings is by using benzophenone as a photo initiator in coating applications. Upon ultraviolet (UV) light exposure occurs benzophenone photochemistry which is UV light-induced crosslinking reactions of polymers. This conventional approach may exploit sunlight as a UV sources at low cost. However, there are some drawbacks with benzophenone. Benzophenone is less effective in improving DPUR performance over a long period of time. The crosslinking effect caused by benzophenone photochemistry will also be heavily reduced in rainy conditions during applications. Coating film surfaces are susceptible to cracking due to over crosslinking caused by high dosing levels of benzophenone. Benzophenone easily sublimates, which may lead to volatile organic compounds (VOC) emission.
To improve long term DPUR performance, benzophenone derivatives are used as light stabilizing additives in combination with benzophenone. However, due to the presence of benzophenone, VOC emission remains a concern.
Therefore, it is desirable to provide a novel benzophenone derivative as a replacement of benzophenone and the combination of benzophenone and benzophenone derivatives, which novel benzophenone derivative provides better crosslinking efficiency and improvement to DPUR performance.
SUMMARY OF THE INVENTION
In a first aspect, the present invention provides a benzophenone derivative represented by the following Formula A:
[Formula A]
Figure PCTCN2016095677-appb-000001
wherein R1 and R2 are each independently hydrogen, alkyl or a substituted alkyl group, and R3 is hydrogen or has a structure of Formula B:
[Formula B]
Figure PCTCN2016095677-appb-000002
wherein R4 and R5 are independently hydrogen, alkyl, or a substituted alkyl group.
In a second aspect, the present invention provides an aqueous copolymer dispersion comprising (a) an aqueous emulsion copolymer, wherein the aqueous emulsion copolymer comprises, as copolymerized units, at least 90％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer； and up to 10％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer； and (b) from 0.05％to 3％by weight, based on the dry weight of the copolymer, of the benzophenone derivative of the first aspect.
In a third aspect, the present invention provides an aqueous coating composition comprising the aqueous copolymer dispersion of the second aspect.
DETAILED DESCRIPTION OF THE INVENTION
The benzophenone derivative represented by the following Formula A:
[Formula A]
Figure PCTCN2016095677-appb-000003
wherein R1 and R2 are each independently hydrogen, alkyl or a substituted alkyl group, and R3 is hydrogen or has a structure of Formula B:
[Formula B]
Figure PCTCN2016095677-appb-000004
wherein R4 and R5 are independently hydrogen, alkyl, or a substituted alkyl group.
The benzophenone derivative of the present invention may be prepared by a conventional substitution reaction. In one embodiment, the benzophenone derivative may be synthesized by reacting 4-hydroxyaniliane with 4-chloro benzophenone or 4, 4’ -dichloro benzophenone in the presence of one or more strong base catalyst at a temperature of from about 120℃ (degree Celsius) to 180℃. As used in this specification, a strong base catalyst is an inorganic hydroxide. Examples of suitable strong base catalysts include sodium hydroxide, potassium hydroxide； or combinations thereof. Preferably, the strong base catalyst is sodium hydroxide.
The aqueous copolymer dispersion comprises:
(a) an aqueous emulsion copolymer, wherein the aqueous emulsion copolymer comprises, as copolymerized units, at least 90％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer； and up to 10％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer； and
(b) from 0.05％to 3％, preferably from 0.1％to 1％, and more preferably from 0.2％to 0.8％by weight, based on the dry weight of the copolymer, of the benzophenone derivative of the present invention.
The term “at least” in a percentage range herein means any and all amounts greater than and including the start point of the range through to 100％but not including 100％.
The term “up to” in a percentage range herein means any and all amounts larger than zero and through to and including the end point of the range.
By “nonionic monomer” herein is meant that the copolymerized monomer residue does not bear an ionic charge between pH＝1-14. The ethylenically unsaturated nonionic monomers include, for example, (meth) acrylic ester monomers, wherein “ (meth) acrylic ester” designates methacrylic ester or acrylic ester, including methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, methyl methacrylate, butyl methacrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate； (meth) acrylonitrile； amino-functional and ureido-functional monomers； monomers carrying alkoxysilane functionality； monomers bearing acetoacetate-functional groups； styrene and substituted styrenes； butadiene； ethylene, propylene, α-olefins such as 1-decene； vinyl acetate, vinyl butyrate, vinyl versatate and other vinyl esters； and vinyl monomers such as vinyl chloride, vinylidene chloride.
By “stabilizer monomer” herein refers to the copolymerized monomer residue bears an ionic charge between pH＝1-14. The stabilizer monomer includes, for example, a, β-monoethylenically unsaturated carboxylic acids of from 3 to 8 carbon atoms, anhydrides and amides. The a, β-monoethylenically unsaturated carboxylic acid monomers include, for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid and salts or anhydrides thereof, and the amides of these acids, particularly acrylamide and methacrylamide； and combinations thereof. The stabilizer monomer further includes sulfur-containing or phosphor-containing acidic monomer.
In one embodiment, the aqueous emulsion copolymer may further comprise up to 5％, preferably up to 3％, more preferably up to 2％by weight, based on the dry weight of the copolymer, of copolymerized multi-ethylenically unsaturated monomers, for example, allyl methacrylate, diallyl phthalate, 1, 4-butylene glycol dimethacrylate, 1, 2-ethylene glycol dimethacrylate, 1, 6-hexanediol diacrylate, or divinyl benzene； or combinations thereof.
In one embodiment, the aqueous emulsion copolymer has a glass transition temperature (Tg) of –70℃ to +70℃, preferably from –40℃ to +30℃.
“Tg” used herein are those calculated by using the Fox equation (T. G. Fox, Bull. American Physical Society, Volume 1, Issue No. 3, page 123 (1956) ) . For example, for calculating the Tg of a copolymer of monomers M1 and M2,
Figure PCTCN2016095677-appb-000005
wherein Tg (calc. ) is the glass transition temperature calculated for the copolymer, w (M1) is the weight fraction of monomer M1 in the copolymer, w (M2) is the weight fraction  of monomer M2 in the copolymer, Tg (M1) is the glass transition temperature of the homopolymer of M1, and Tg (M2) is the glass transition temperature of the homopolymer of M2, all temperatures being in K. The glass transition temperatures of homopolymers may be found, for example, in “Polymer Handbook” , Fourth edition edited by J. Brandrup, E. H. Immergut, and E. A. Grulke, Interscience Publishers, 1999.
The aqueous emulsion copolymer of the present invention may be prepared by polymerization techniques well known in the art. Either thermal or redox initiation processes may be used in the polymerization process. Conventional free radical initiators may be used such as hydrogen peroxide, t-butyl hydroperoxide, t-amyl hydroperoxide, ammonium and alkali persulfates, typically at a level of 0.01％to 3.0％by weight, based on the weight of total monomer. Redox systems using the same initiators coupled with a suitable reductant such as sodium sulfoxylate formaldehyde, sodium hydrosulfite, isoascorbic acid, hydroxylamine sulfate and sodium bisulfite may be used at similar levels, optionally in combination with metal ions such as iron and copper, optionally further including complexing agents for the metal. The monomer mixture may be added in a single addition or more additions or continuously over the reaction period using a uniform or varying composition. Additional ingredients such as oxidants, reducing agents, chain transfer agents, neutralizers, surfactants, and dispersants may be added prior to, during, or subsequent to the monomer addition.
In another embodiment of the present invention, the aqueous emulsion copolymer may be prepared by a multistage emulsion polymerization process, in which at least two stages differing in composition are polymerized in sequential fashion. The polymerization techniques used to prepare such multistage emulsion polymers are well known in the art. Such a process sometimes results in the formation of at least two mutually incompatible polymer compositions, thereby resulting in the formation of at least two phases within the polymer particles. Such particles are composed of two or more phases of various geometries or morphologies such as, for example, core/shell or core/sheath particles, core/shell particles with shell phases incompletely encapsulating the core, core/shell particles with a multiplicity of cores, and interpenetrating network particles. In all of these cases the majority of the surface area of the particle will be occupied by at least one outer phase and the interior of the particle will be occupied by at least one inner phase. Each of the stages of the multi-staged emulsion polymer may contain the same monomers, surfactants, chain transfer agents, etc. as disclosed herein-above for the emulsion polymer. In the case of a multi-staged polymer particle, the Tg for the purpose of this invention is to be calculated by the Fox equation as  detailed herein using the overall composition of the emulsion polymer without regard for the number of stages or phases therein. Similarly, for a multi-staged polymer particle, the amount of the monomers shall be determined from the overall composition of the emulsion polymer without regard for the number of stages or phases therein.
The average particle diameter of the aqueous emulsion copolymer particles is from 50 to 800 nanometers, preferably from 100 to 400 nanometers, as measured by a BI-90 Particle Sizer.
The aqueous coating composition comprises an aqueous copolymer dispersion comprising,
(a) an aqueous emulsion copolymer, wherein the emulsion copolymer comprises, as copolymerized units, at least 90％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer； and up to 10％by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer； and
(b) from 0.05％to 3％, preferably from 0.1％to 1％, and more preferably from 0.2％to 0.8％by weight, based on the dry weight of the copolymer, of the benzophenone derivative of the present invention.
The aqueous coating composition may further comprise at least one coating adjuvant. The adjuvant herein refers to components in the coating except for the emulsion copolymer.
The adjuvant may comprise pigment. Examples of suitable pigments include zinc oxide, antimony oxide, zirconium oxide, chromium oxide, iron oxide, lead oxide, zinc sulfide, lithopone, and titanium dioxide, for example, anatase and rutile titanium dioxide. It is also contemplated that the aqueous copolymer dispersion optionally contains opaque polymer particles such as ROPAQUETM opaque polymers available from Rohm and Haas Company, a wholly owned subsidiary of The Dow Chemical Company.
The adjuvant may comprise at least one extender. Examples of suitable extenders include calcium carbonate, calcium sulfate, barium sulfate, mica, clay, calcined clay, feldspar, nepheline, syenite, wollastonite, diatomaceous earth, alumina silicates, non-film forming polymer particles having glass transition temperatures above 35℃, aluminum oxide, silica sol and talc.
The adjuvant may comprise colorant. Examples of suitable colorants include inorganic colorant particles and organic colorant particles. Examples of suitable inorganic colorant particles include, for example, iron oxides, chromium oxides, carbon black, and metal effect pigments such as aluminum, copper, copper oxide, bronze, stainless steel, nickel,  zinc, and brass. Examples of suitable organic colorant particles include, for example, azo pigments, phthalocyanine pigments, and quinacridone pigments.
Other materials are optionally included in the adjuvants including rheology modifier, coalescents, solvents, biocides, wetting agents, defoamers, dyes, humectants, waxes, surfactants, flatting agents, neutralizers, buffers, free-thaw additives, plasticizers, antifoaming agents, tackifiers, hindered amine light stabilizers, photoabsorbers, dispersants, and anti-oxidants. The photoabsorbers can be combined with the aqueous copolymer dispersion or can be added to the aqueous coating composition subsequently. Suitable levels of photoabsorbers include from 0.1％to 7％by weight solids basis of the aqueous copolymer dispersion.
The amount of pigment and extender in the aqueous coating composition vary from a pigment volume concentration (PVC) of 0 to 85％and thereby encompass coatings otherwise described in the art, for example, clean coatings, flat coatings, satin coatings, semi-gloss coatings, gloss coatings, primers, textured coatings, and the like. Preferable PVC is from 10％to 70％, more preferably PVC is from 10％to 60％. The pigment volume concentration is calculated by the following formula:
Figure PCTCN2016095677-appb-000006
If the aqueous copolymer dispersion is to be pigmented, at least one pigment is dispersed in an aqueous medium, preferably using a high shearing mixing. Alternatively, at least one pre-dispersed pigment may be used. In one method, the aqueous copolymer dispersion is added to a pigment dispersion, either simultaneously or sequentially, by mixing under low shear stirring along with other adjuvants as desired, to provide a pigmented aqueous copolymer dispersion. Alternatively, pigment slurry may be prepared in the presence of the aqueous copolymer dispersion.
The solids content of the aqueous coating composition is typically in the range of from 25％to 60％by volume. The viscosity of the aqueous coating composition is typically from 50KU (Krebs Units) to 140KU as measured by using a Brookfield Digital Viscometer KU-1. The viscosities appropriate for different application methods vary considerably.
The aqueous coating composition of the present invention may be prepared by techniques which are well known in the coatings art. Components in the aqueous coating composition may be mixed in any order to provide the aqueous coating composition of the present invention. Any of the above-mentioned optional components may also be added to the composition during or prior to the mixing to form the aqueous coating composition.
The process of using the aqueous coating composition of the present invention may comprise the following: applying the aqueous coating composition to a substrate, exposing the applied aqueous coating composition to UV light, and drying the applied aqueous coating composition or allowing it to dry. The aqueous coating composition of the present invention can be applied to a substrate by known means such as brushing, dipping, rolling and spraying. The coating composition is preferably applied by spraying. The standard spray techniques and equipment for spraying such as air-atomized spray, air spray, airless spray, high volume low pressure spray, and electrostatic spray such as electrostatic bell application, and either manual or automatic methods can be used. After the aqueous coating composition of the present invention has been applied to a substrate, the aqueous coating composition may be dried, or be allowed to dry, at a room temperature of from 21℃ to 25℃, or at an elevated temperature, for example, from 35℃ to 60℃ to form a film.
The aqueous coating composition of the present invention can be applied to, and adhered to, various substrates. Examples of suitable substrates include wood, metals, plastics, foams, stones, elastomeric substrates, glass, fabrics, or concrete.
The dry coating prepared from the aqueous coating composition may be used as a protective coating or an aesthetic coating. Examples of suitable coatings include architectural coatings such as interior and exterior paint coatings, including masonry coatings, wood coating, cementious coatings and treatments； maintenance coatings such as metal coatings； paper coatings； and traffic coatings such as those coatings used to provide markings on roads, pavements, and runways.
In the present specification, the technical features in each preferred technical solution and more preferred technical solution can be combined with each other to form new technical solutions unless indicated otherwise. For briefness, the Applicant omits the descriptions for these combinations. However, all the technical solutions obtained by combining these technical features should be deemed as being literally described in the present specification in an explicit manner.
EXAMPLES
The experimental methods in the examples, when not described in detail, is contemplated to follow normal conditions in the art, for example, handbooks of polymer chemistry, or follow conditions suggested by chemical or instrument manufacturer.
I. RAW MATERIALS USED
TABLE 1 to 3 below list the representative materials that can be used to make the benzophenone derivatives, the aqueous copolymer dispersions and the aqueous coating compositions in accordance with certain embodiments of the present invention.
TABLE 1: Representative List of Raw Materials Used to Prepare Benzophenone Derivatives
Figure PCTCN2016095677-appb-000007
TABLE 2: Representative List of Materials Used to Prepare Aqueous Copolymer Dispersions
Figure PCTCN2016095677-appb-000008
TABLE 3: Representative List of Materials Used to Prepare Aqueous Coating Compositions
Figure PCTCN2016095677-appb-000009
Figure PCTCN2016095677-appb-000010
II. ANALYTICAL METHOD
To determine the DPUR level of a given aqueous coating composition sample, a DPUR test was conducted.
The aqueous coating composition sample was coated on asbestos by using a drawdown roller stick to form a 120 micron-thick wet film as a first layer. The coated asbestos was allowed to be cured in a consistent temperature room (23℃ and 50％relative humidity) for 4 hours. Then the aqueous coating composition sample was applied onto the first layer by using the drawdown roller stick to form an 80 micron-thick wet film as a second layer. The coated asbestos was allowed to be cured in the consistent temperature room (23℃ and 50％relative humidity) for 14 days. Then the coated asbestos was exposed to a QUV accelerated weathering tester equipped with UVA-340nm lamps (QUV accelerated weathering tester: Model QUV/Spray； Irradiance 0.77W/m2/nm) for 1 hour, 2 hours or 4 hours.
The DPUR level of the given aqueous coating composition sample is evaluated according to Item 5.4 (5.4.1.2 Method A) of the GB/T 9780-2013 standard: The GB/T 9780-2013 standard herein is the national standard for Test method for dirt pickup resistance and stain removal of film of architectural coatings and paint, which was published by General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China (P. R. China) and Standardization Administration of the P. R. China, issued on November 27, 2013, and put into effect on August 1, 2014.
III. SAMPLE PREPARATIONS
1. Synthesis of Inventive Benzophenone Derivatives
Inventive Benzophenone Derivative Compound A
Inventive Benzophenone Derivative Compound A was synthesized via the following procedure. 21.6 grams of 4-chloro benzophenone, 11.99 grams of 4-hydroxyaniliane, 0.56 grams of potassium hydroxide were added into 100 milliliters (ml) of NMP sequentially in a 250-ml vessel. The vessel was heated to a temperature of from 150℃ to 190℃ for around 12 hours. Then, the mixture in the vessel was cooled to room temperature. The solvent NMP was removed from the mixture by distillation under a reduced-pressure condition. 100 ml of toluene was then added into the mixture. The mixture was then washed by using a 50-ml 5％NaCl solution. The toluene was removed from the mixture by distillation under a reduced-pressure condition after a toluene layer was formed. 26.0 grams of an intermediate was obtained.
23.1 grams of the intermediate and 1.1 grams of potassium carbonate were added into 50 ml of chloroethanol in a 100-ml vessel. The vessel was heated to 70℃ for 5 hours before the mixture was cooled down to room temperature. The chloroethanol was then removed by distillation from the mixture under a reduced–pressure condition. Then the crude mixture was purified by recrystallization in ethanol solution. 20.5 grams of Inventive Benzophenone Derivative Compound A was then obtained.
Figure PCTCN2016095677-appb-000011
Inventive Benzophenone Derivative Compound B
Inventive Benzophenone Derivative Compound B was synthesized via the following procedure. 25.0 grams of 4, 4’ -dichloro benzophenone, 23.98 grams of 4-hydroxyaniliane, 0.56 grams of potassium hydroxide were added into 100 ml of NMP sequentially in a 250-ml vessel. The vessel was heated to a temperature of from 150℃ to 190℃ for around 12 hours. Then, the mixture in the vessel was cooled to room temperature. The solvent NMP was removed from the mixture by distillation under a reduced-pressure condition. 100 ml of  toluene was then added into the mixture. The mixture was then washed by using a 50-ml 5％NaCl solution. The toluene was removed by distillation under a reduced-pressure condition after a toluene layer was formed. 35.0 grams of an intermediate was obtained.
31.68 grams of the intermediate and 1.1 grams of potassium carbonate were added into 50 ml of chloroethanol in a 100-ml vessel. The vessel was heated to 70℃ for 5 hours before the mixture was cooled down to room temperature. The chloroethanol was then removed by distillation from the mixture under a reduced–pressure condition. Then the crude mixture was purified by recrystallization in ethanol solution. 32.5 grams of Inventive Benzophenone Derivative Compound B was then obtained.
Figure PCTCN2016095677-appb-000012
2. Preparation of Aqueous Copolymer Dispersions
Preparation of Inventive Aqueous Copolymer Dispersions
Inventive Aqueous Copolymer Dispersion 1: A solution was made by blending 1 gram of Inventive Benzophenone Derivative Compound A with 500 grams of PRIMAL AC-261P binder under agitation.
Inventive Aqueous Copolymer Dispersions 2 to 4 were prepared by using the same procedure as outlined for Inventive Copolymer Dispersion 1, except for the amounts of different benzophenone derivatives and binders being used. The amounts of various components (in grams) to make Inventive Copolymer Dispersions 1 to 4 are shown in TABLE 4 below.
Preparation of Comparative Aqueous Copolymer Dispersions
Comparative Aqueous Copolymer Dispersion 1: A solution was made by blending 1 gram of benzophenone with 500 grams of PRIMAL AC-261P binder under agitation.
Comparative Aqueous Copolymer Dispersion 2: A solution was made by blending 1 gram of benzophenone with 500 grams of ELASTENE 3808 binder under agitation.
The amounts of various components (in grams) to make Comparative Copolymer Dispersions 1 and 2 are shown in TABLE 4 below.
TABLE 4
Figure PCTCN2016095677-appb-000013
3. Preparation of Aqueous Coating Compositions
Inventive Aqueous Coating Composition 1
Inventive Aqueous Coating Composition 1 was made with a 48VS/40PVC (VS: volume solids) formulation using Inventive Aqueous Copolymer Dispersion 1.
Grind Phase: 150.0 grams of water, 15.0 grams of propylene glycol, 2.0 grams of NATROSOL 250 HBR thickener, 2.0 grams of AMP-95 base, 10.0 grams of OROTAN CA-2500 Dispersant, 2.0 grams of TRITON BD-109 wetting agent, 1.0 grams of NOPCO NXZ defoamer, 7.0 grams of ROCIMA 363 biocide, 150.0 grams of TI-PURE R-902 pigment, and 130.0 grams of CC-700 extender were added into a tank and stirred with a COWLES mixer under a high speed. The grind phase components were then well dispersed.
Letdown Phase: 380.0 grams of Inventive Aqueous Copolymer Dispersion 1, 50.0 grams of ROPAQUE Ultra E opaque polymer, 19.0 grams of TEXANOL coalescent, 5.0 grams of ACRYSOL RM-8W thickener, and 10.0 grams of ACRYSOL RM-2020 NPR thickener were then added to the tank and stirred with a conventional lab mixer (IKA mixer) .
The amounts of the components (in grams) used in the grind phase and the letdown phase are shown in TABLE 5 below.
TABLE 5
Figure PCTCN2016095677-appb-000014
Inventive Aqueous Coating Compositions 2 to 4 and Comparative Compositions 1 and 2
Inventive Aqueous Coating Compositions 2 to 4 and Comparative Compositions 1 and 2 were prepared by using the same procedure outlined for Inventive Aqueous Coating Composition 1, except for the amounts of different aqueous copolymer dispersion and TEXANOL coalescent used in the letdown phase. The amounts of various aqueous copolymer dispersions and TEXANOL coalescent (in grams) used in the letdown phase for Inventive Aqueous Coating Compositions 2 to 4 and Comparative Compositions 1 and 2 are shown in TABLE 6 below.
TABLE 6
Figure PCTCN2016095677-appb-000015
Figure PCTCN2016095677-appb-000016
IV. SUMMARY OF ALL COATING COMPOSITIONS ANALYZED
For purpose of demonstrating the superior properties of the aqueous coating compositions embodying the present invention, numerous coating samples with various combinations of key ingredients have been prepared and analyzed.
First, a comparison of DPUR performance was made between aqueous coating compositions prepared using the inventive benzophenone derivatives and those prepared using the conventional benzophenone. In particular, Inventive Aqueous Coating Compositions 1 to 4 were made from the inventive benzophenone derivative； whereas Comparative Aqueous Coating Compositions 1 and 2 were made from the conventional benzophenone.
Second, a comparison of UV initiator efficiency under different UV irradiation period was made between aqueous coating compositions prepared using the inventive benzophenone derivatives and those prepared using the conventional benzophenone.
V. ANALYTICAL RESULTS
TABLE 7 below summarizes the DPUR levels of the inventive aqueous coating compositions (made with inventive benzophenone derivative) and the comparative aqueous coating compositions (made with the conventional benzophenone) determined according to the test method described above.
TABLE 7: DPUR Levels of Aqueous Coating Compositions
Aqueous Coating Composition UV Irradiation DPUR (％)
Inventive Aqueous Coating Composition 1 4 hours 10.0
Inventive Aqueous Coating Composition 2 4 hours 11.7
Comparative Aqueous Coating Composition 1 4 hours 13.0
Inventive Aqueous Coating Composition 3 4 hours 28.0
Inventive Aqueous Coating Composition 4 4 hours 32.4
Comparative Aqueous Coating Composition 2 4 hours 34.5
Inventive Aqueous Coating Composition 3 1 hour 12.6
Comparative Aqueous Coating Composition 2 1 hour 14.7
Inventive Aqueous Coating Composition 3 2 hours 11.0
Comparative Aqueous Coating Composition 2 2 hours 13.1
TABLE 7 shows that, for aqueous coating compositions that were made with PRIMAL AC-261P binder, those aqueous coating compositions that were made using the inventive benzophenone derivatives (Inventive Aqueous Coating Compositions 1 and 2) demonstrate a lower DPUR level (better DPUR performance) than that made using the conventional benzophenone (Comparative Aqueous Coating Composition 1) ； for aqueous coating compositions that were made with ELASTENE 3808 binder, those aqueous coating compositions that were made using the inventive benzophenone derivatives (Inventive Aqueous Coating Compositions 3 and 4) again demonstrate a lower DPUR level (better DPUR performance) than that made using conventional benzophenone (Comparative Aqueous Coating Composition 2) .
TABLE 7 further shows that, under different UV irradiation period (1 hour, 2 hours and 4 hours) , the aqueous coating composition that was made using the inventive benzophenone derivative (Inventive Aqueous Coating Composition 3) demonstrate a lower DPUR level (better DPUR performance) than that made using the conventional benzophenone (Comparative Aqueous Coating Composition 2) accordingly.

Claims (7)

  1. A benzophenone derivative represented by the following Formula A:
    Figure PCTCN2016095677-appb-100001
    wherein R1 and R2 are each independently hydrogen, alkyl or a substituted alkyl group, and R3 is hydrogen or has a structure of Formula B:
    Figure PCTCN2016095677-appb-100002
    wherein R4 and R5 are independently hydrogen, alkyl, or a substituted alkyl group.
  2. An aqueous copolymer dispersion comprising
    (a) an aqueous emulsion copolymer； and
    (b) from 0.05％ to 3％ by weight, based on the dry weight of the copolymer, of the benzophenone derivative of Claim 1.
  3. The aqueous copolymer dispersion of Claim 2, wherein the aqueous copolymer dispersion comprises from 0.2％ to 0.8％ by weight, based on the dry weight of the copolymer, of the benzophenone derivative of Claim 1.
  4. The aqueous copolymer dispersion of Claim 2, wherein the aqueous emulsion copolymer further comprises up to 5％ by weight, based on the dry weight of the copolymer, of copolymerized multi-ethylenically unsaturated monomers.
  5. The aqueous copolymer dispersion of Claim 2, wherein the aqueous emulsion copolymer has a glass transition temperature of –70℃ to +70℃.
  6. The aqueous copolymer dispersion of claim 2, wherein the aqueous emulsion copolymer comprises, as copolymerized units, at least 90％ by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated nonionic monomer； and up to 10％ by weight, based on the dry weight of the copolymer, of an ethylenically unsaturated stabilizer monomer.
  7. An aqueous coating composition comprising the aqueous copolymer dispersion of any one of Claims 2 to 6.
PCT/CN2016/095677 2016-08-17 2016-08-17 Benzophenone derivative, aqueous copolymer dispersion and aqueous coating composition WO2018032410A1 (en)

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