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Acrylate-containing polymer blends and methods of using
Inactive Publication Date: 2001-01-30
3M INNOVATIVE PROPERTIES CO
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The present invention relates to a blend comprising (a) a modified block copolymer comprising (i) a polystyrene block and (ii) a polydiene block or a hydrogenated polydiene block, said polydiene block or hydrogenated polydiene block being modified to contain an average of one or more carboxyl groups; (b) a polymer comprising a polymerization reaction product of two or more mono-ethylenically unsaturated monomers in which (i) at least one of the monomers is an acrylic or methacrylic acid ester of a non-tertiary alcohol having 1 to 14 carbon atoms, inclusive and (ii) at least one of the monomers has carboxylic acid functionality and is present in an amount ranging from about 1 to about 15 parts by weight, based on 100 parts by weight of polymer (b); polymer (b) does not comprise a nitrogen-containing monomer.
The invention also relates to a method of priming a substrate comprising applying to the substrate a blend comprising (a) a modified block copolymer comprising (i) a polystyrene block and (ii) a polydiene block or a hydrogenated polydiene block, said polydiene block or hydrogenated polydiene block being modified to contain an average of one or more carboxyl groups; (b) a polymer comprising a polymerization reaction product of two or more mono-ethylenically unsaturated monomers in which (i) at least one of the monomers is an acrylic or methacrylic acid ester of a non-tertiary alcohol having 1 to 14 carbon atoms, inclusive and (ii) at least one of the monomers has carboxylic acid functionality and is present in an amount ranging from about 1 to about 15 parts by weight, based on 100 parts by weight of polymer (b); polymer (b) does not comprise a nitrogen-containing monomer.
In particular, the present invention also relates to a method of enha
Problems solved by technology
Such surfaces are generally unreceptive to inks, paints, and adhesives due to their poor wettability.
Method used
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Aluminum specimens (typically 152.4 mm.times.50.8 mm.times.1.6 mm) (commercially available from Vincent Metals, Minneapolis, Minn. under the designation "2024-T3 Alclad") are treated according to the etching process described in H. W. Eichner, Forest Products Laboratory; Report No. 1842, Apr. 1, 1954, Madison, Wis., USA. Specifically, the specimens are treated as follows. Each specimen is rinsed in acetone and then allowed to air dry. Next, each specimen is degreased by soaking for 10 minutes in 75 g of Oaktite 164 (alkaline detergent) (commercially available from Oaktite Products, Inc., Berkeley Heights, N.J.) per liter of distilled water. Each specimen is then rinsed for 2 minutes in tap water, followed by immersion for 10 minutes at 71.degree. C. in an etching bath consisting of 1161 g of H.sub.2 SO.sub.4, 156.8 g of Na.sub.2 Cr.sub.2 O.sub.7 2H.sub.2 O, 1.5 g of 2024-T3 bare aluminum alloy chips, and enough distilled water to make 3.5...
examples 1-7
A number of about 3.5% primer solutions of this invention were prepared by blending in a 1:3 weight ratio of primer composition (1) to acrylic polymers of primer composition (2) as shown below.
Example Primer Composition (2) 1 IOA / AA (95 / 5) 2 IOA / AA (90 / 10) + TE 3 IOA / AA (95 / 5) + TE 4 IOA / AA (95 / 5) + CLA 5 IOA / AA (95 / 5) + DC 6 IOA / AA (95 / 5) + TBT 7 IOA / PSM / AA (90 / 7 / 3) + TE
The primer solutions were applied by brush to 152 mm.times.51 mm.times.5 mm plaques of low densitypolyethylene (LDPE), polypropylene (PP) (both available from Precision Punch and Plastics, Minneapolis, Minn.), and a thermoplasticpolyolefin (TPO) (available from Himont USA, Inc., Lansing, Mich., under the trade designation "ETA 3163"). After 10 minutes, aluminum foil-laminated foam pressure sensitiveadhesive tape samples (I mm thick acrylic pressure sensitiveadhesive foam tape available from Minnesota Mining and Manufacturing Company, St. Paul, Minn., under the trade designation "VHB-4205") were bonded to the pri...
example 8
Primer composition (1) and primer composition (2), IOA / AA of Example 1 were diluted to 3% polymer solids with a solvent blend of cyclohexane, xylene, and ethanol in a weight ratio of 5.5:3.5:1.0 and applied by brush to PP and LDPE test plaques. Peel values were determined and are compared to Example 1.
TABLE II Peel Values N / 100 mm LDPE PP Primer Comp. (1) 88 88 Primer Comp. (2) of Example 1 53 158 Example 1 140 280
The results demonstrate that while the individual blend components, when used alone do not perform well as primers, high peel adhesions can be obtained when these components are blended together in accordance with the present invention.
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Abstract
A polymer blend comprising (a) a modified block copolymer comprising (i) a polystyrene block and (ii) a polydiene block or a hydrogenated polydiene block, said polydiene block or hydrogenated polydiene block being modified to contain an average of one or more carboxyl groups; and (b) a polymer comprising a polymerizationreaction product of two or more mono-ethylenically unsaturated monomers in which (i) at least one of the monomers is an acrylic or methacrylic acid ester of a non-tertiaryalcohol having 1 to 14 carbon atoms, inclusive and (ii) at least one of the monomers has carboxylic acid functionality and is present in an amount ranging from about 1 to about 15 parts by weight, based on 100 parts by weight of polymer (b), and a method of priming a substrate comprising applying the blend to the substrate.
Description
BACKGROUND OF THE INVENTION1. Field of the InventionThis invention relates to polymer blends useful, e.g., as adhesives, primers, inks, and paints.2. Description of the Background ArtLow surface energy substrates such as polyethylene, polypropylene, and other polyolefins are characterized as having critical surface tensions of wetting of about 35 dynes / cm or less. Such surfaces are generally unreceptive to inks, paints, and adhesives due to their poor wettability. There is a need to improve adhesion to such surfaces, as well as to high energy surfaces.SUMMARY OF THE INVENTIONThe present invention relates to a blend comprising (a) a modified block copolymer comprising (i) a polystyrene block and (ii) a polydiene block or a hydrogenated polydiene block, said polydiene block or hydrogenated polydiene block being modified to contain an average of one or more carboxyl groups; (b) a polymer comprising a polymerizationreaction product of two or more mono-ethylenically unsaturated monomers...
Claims
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Application Information
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