Non-whitening emulsion pressure sensitive adhesives
An adhesive and hydraulic technology, applied in the direction of adhesive types, ester copolymer adhesives, non-polymer adhesive additives, etc., can solve problems such as reducing adhesives, and achieve environmentally friendly effects
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Embodiment 1-6 and comparative example C1
[0067] In Example 1, 43.52 grams of n-butyl acrylate (BA), 7.68 grams of 2-hydroxyethyl acrylate (HEA), 300 grams of DI water and 0.5 grams of RHODACAL DS-10 (12 Sodium alkylbenzene sulfonate surfactant, available from Rhone-Poulenc). The mixture was stirred under nitrogen and degassed 4 times. The temperature was raised to 60°C and 1.29 grams of potassium persulfate initiator was added. The exotherm temperature reached 64°C. The reaction mixture was then heated to 70°C and held at this temperature for 20 minutes to complete the seeding reaction. The reaction temperature was further increased to 80°C. The pre-emulsified monomer mixture was fed to the reactor at 5.3 g / min for 2 hours at 80°C. The pre-emulsified mixture contained 391.68 grams of BA, 69.12 grams of HEA, 167 grams of DI water and 5.29 grams of RHODACAL DS-10. After the addition of the monomer mixture, the reaction was continued for a further 60 minutes at 80°C. After cooling to room temperature, the reaction...
Embodiment 7-9
[0074] Examples 7-9 illustrate the use of another hydroxyalkyl (meth)acrylate monomer in a high transmittance, low haze emulsion pressure sensitive adhesive composition. All adhesive compositions were prepared by the semicontinuous emulsion polymer method described in Example 1 using the amounts of butyl acrylate and hydroxyalkyl acrylate monomers shown in Table 2 and tested for haze as described above. The light transmission and opacity of Examples 8 and 9 were also measured. The results of these tests are shown in Table 2.
[0075] Example
Embodiment 1
[0077] Examples 10-14 illustrate the use of alkyl acrylate comonomers (isooctyl acrylate (IOA), methyl methacrylate (MMA) in high transmittance, low haze acrylic latex pressure sensitive formulations of the present invention. and / or isobornyl acrylate (IBA)) and polar comonomers (acrylic acid (AA)), as well as butyl acrylate and hydroxyalkyl ester monomers. All adhesive compositions were prepared using the semi-continuous emulsion polymerization method described in Example 1, using the monomer levels listed in Table 7, and tested for light transmission, haze, and opacity as described above. The results of these tests are reported in Table 3.
[0078] Example
PUM
Property | Measurement | Unit |
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opacity | aaaaa | aaaaa |
transmittivity | aaaaa | aaaaa |
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