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
  • 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
  • C09D133/062—Copolymers with monomers not covered by C09D133/06
  • C09D133/064—Copolymers with monomers not covered by C09D133/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
  • C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds

Definitions

• the present invention relates to a primer composition to be used for improving the adhesion strength of an adhesive tape, and more particularly a decorative adhesive tape, to a substrate painted with a melamine resin paint or an anti-acid rain paint.
• the primer composition is applied to the painted substrate before the adhesive tape is adhered to the painted substrate.
• peripheral portions for example, door pillars
• the peripheral portions for example, door pillars
• the peripheral portions are coated to be black as a design of an automobile.
• it has tended to become common to stick a black color adhesive tape on the peripheral portions in place of coating with a paint owing to environmental requirements to decrease the use of organic solvents in coating and owing to the reasons regarding the work processes.
• Sticking such an adhesive tape for decoration can be carried out by directly sticking an adhesive tape, having an acrylic adhesive in an adhesion face, to object faces of the peripheral portions of the side windows, already coated with a ground color of the body. It can also be carried out by applying a resin composition, having a prescribed adhesive property to improve the adhesion force, to the adhesive tape to the object faces and then sticking an adhesive tape thereto.
• a resin composition usable as an adhesive are compositions containing a copolymer having carboxyl groups in the molecule, a copolymer having amino groups, and the like as constituent components.
• Japanese Patent Laid-Open No. 59-30872 discloses an aqueous composition for coating, which is an aqueous solution or an aqueous dispersion of an addition copolymerized resin obtained by reaction of a carboxyl-containing copolymer with an unsaturated aliphatic primary amine.
• 6-322342 discloses a binary solution type adhesive composition containing (A) an aqueous solution of a polymer compound having carboxyl groups and/or sulfonic acid groups in the molecule and (B) an aqueous solution of an amino groupcontaining acrylic copolymer in the molecule and Japanese Patent Laid-Open No. 2655574 discloses an acrylic copolymer containing primary amine groups and carboxylic acid groups, respectively.
• High shearing force can be applied partially between the side window peripheral portions to which an adhesive tape is adhered and the rim portions of the side windows through rubber members. When this occurs, the adhesion strength of the adhesive tape in the relevant portions can be low, and the adhesive tape can become wrinkled. Further, the adhesive tape is to be adhered to the coating to be the ground color of an automobile and there exist as the coating of the automobile are an acidic coating using an anti-acid rain paint and an alkaline coating using a melamine resin paint and a composition capable of improving the adhesion strength of the adhesive tape to the painted substrate painted with any of these paints is desired to be made available. However, conventional resin compositions disclosed in the above mentioned
• Japanese Patent Laid-Open No. 59-30872, Japanese Patent Laid-open No. 6-322342, and Patent No. 2655574 are not proposed for a presumed purpose to adhere an adhesive tape to a painted substrate, so that the effect in such a purpose is not made clear.
• the present invention has been developed taking such a conventional situation into consideration, and the purpose of the present invention is to provide a composition capable of improving the adhesion strength of an adhesive tape, especially the durability to shearing force in relation to the painted surface and making the adhesive tape usable for the case where the adhesive tape is adhered to any of the acidic paint and the alkaline paint.
• the present invention provides a primer composition comprising (A) a graft copolymer of an acrylic copolymer grafted with an aminoalkyl group having a primary amino group in the terminal; (B) an acrylic copolymer having carboxyl group in the molecular chain; and (C) a solvent capable of dissolving or dispersing the component (A) and the component (B) therein as essential constituent components.
• the primer composition of the present invention contains the component (A) excellent in adhesion to an acidic paint-coated surface (an anti-acid rain paint) and an acrylic adhesive (acidic) and the component (B) excellent in adhesion to an alkaline paint- coated surface (a melamine resin paint) in a single solution, the composition allows an adhesive tape containing an acrylic adhesive to be adhered to both of the alkaline paint- coated surface and the acidic paint-coated surface and improves the adhesion strength of the adhesive tape to the respective painted surfaces, especially the durability to the shearing force.
• Japanese Patent Laid-Open No. 59-30872 and Patent No. 2655574 are basically different in terms of the constitution from the primer composition of the present invention in a point that they contain only one type of component as a copolymer and the composition disclosed in the Japanese Patent Laid-Open No. 6-322342 is different in a point that it is a two-solution-type adhesive composition.
• the component (A) More particularly, it is preferable to use those having the amine-H equivalent from 350 to 1800 as the component (A) and those having the acid value (mg KOH g) from 10 to 110 as the component (B).
• the stability (the coating strength, the heat resistance, the waterproofness, the weathering resistance, and the like) of the primer coating is improved, however the molecular weights are too high, that causes decrease of their solubility and increase of the viscosity of their solution, so that it is preferably to use those having weight average molecular weight of about 100, 000 for the component (A) and those having weight average molecular weight of 4600 to 14,000, for the component (B).
• the glass transition temperature (Tg) of the component (A) and of the component (B) is preferably around room temperature. Practically, it is preferable to use those having Tg of 40 to
• the solvents usable for the component (C) is those capable of dissolving or dispersing the two types of copolymers of the component (A) and the component (B) and normally, organic solvents are used, however in the case where hydrophilic groups are introduced in the component (A) and the component (B) to make them water-soluble resin or these components are emulsified, water may also be used.
• theprimercomposition of the present invention may further contain a variety of additives such as an ultraviolet ray adsorbent, a heat stabilizer, a thickener and the like based on the necessity.
• NK-350 resin solution (amino-H equivalent weight about 1,800; the weight average molecular weight around 100,000; Tg approximately 400°C), manufactured by Nippon Shokubai Co., Ltd., was used as the component (A) and SCX (a registered trade mark) 804 acrylic resin (acid value about 10; the weight average mlecular weight 14,000; and Tg approximately 60°C), manufactured by Johnson Polymer Corporation was used as the component (B).
• Example 2
• a primer composition solution was produced in the same manner as the foregoing Example 1 except that Joncryl (a registered trade mark) 611 acrylic resin (acid value about 53; the weight average molecular weight 8,100; and Tg approximately 50°C), manufactured by Johnson Polymer Corporation was used as the component (B).
• Joncryl a registered trade mark 611 acrylic resin (acid value about 53; the weight average molecular weight 8,100; and Tg approximately 50°C), manufactured by Johnson Polymer Corporation was used as the component (B).
• a primer composition solution was produced in the same manner as the foregoing Example 1 except that Polyment (a registered trade mark) NK-380 resin solution (amino-H equivalent weight about 700; the weight average molecular weight around 100,000; Tg approximately 100°C) , manufactured by Nippon Shokubai Co., Ltd., was used as the component (A) and Joncryl (a registered trade mark) 611 acrylic resin, manufactured by Johnson Polymer Corporation was used as the component (B).
• Polyment a registered trade mark
• NK-380 resin solution amino-H equivalent weight about 700; the weight average molecular weight around 100,000; Tg approximately 100°C
• Joncryl a registered trade mark
• 611 acrylic resin manufactured by Johnson Polymer Corporation
• NK-350 resin solution manufactured by Nippon Shokubai Co., Ltd.
• Joncryl a, registered trade mark 683 acrylic resin (acid value about 160; the weight average molecular weight 8,000; and Tq approximately 75°C), manufactured by Johnson Polymer Corporation
• a primer composition solution containing 5% of solid matter and being in even solution state was produced using Polyment (a registered trade mark) NK-350 resin solution, manufactured by Nippon Shokubai Co., Ltd., was used as the component (A) but using no component for the component (B) and then diluting the resin solution to 5% of solid by methyl ethyl ketone.
• the adhering method was according to JIS Z 0237 8.2.3. Controls were prepared by directly sticking only the adhesive tape to the melamine resin-painted steel plate and the anti-acid rain paintpainted steel plate without applying any primer composition solutions. Measurement of the durability to shearing force was carried out according to JIS Z 0237 11.3, except that the adhesion surface area was 10 x 10 mm.
• the test pieces coated with the primer compositions of the Examples 1 to 6 according to the present invention showed higher durability to shearing force than the test pieces coated with the primer composition of the comparative Example 2 containing no component for the component (B) and also found that the test pieces were provided with the effect of improving adhesion strength to both the melamine resin-painted steel plate and the anti-acid rain paint-painted steel plate.
• the test piece coated with the primer composition of the comparative Example 2 it took place a phenomenon that the primer composition was stripped from the melamine resin-painted steel plate (in other words, the primer composition was stripped while being left in the adhesive tape side) in tests 2 and 3. Such parting manner would be a serious problem in use of the adhesive tape to be adhered to an automobile.
• the primer composition of the present invention contains a copolymer excellent in adhesion to the acidic paint-coated surface and a copolymer excellent in adhesion to the alkaline paint-coated surface in a single solution, so that the primer composition can be used preferably for sticking an adhesive tape to substrates painted any of the acidic paint and the alkaline paint and can improve the adhesion strength of the adhesive tape to the painted surface and especially remarkably improve the durability to the shearing force.

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

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Cited By (9)

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• 2001
  • 2001-06-08 JP JP2001174301A patent/JP4856322B2/ja not_active Expired - Fee Related
• 2002
  • 2002-06-07 WO PCT/US2002/018218 patent/WO2002100961A1/en active Application Filing

Patent Citations (3)

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