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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

Inactive Publication Date: 2001-02-14
3M CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although solvent-based pressure sensitive adhesives are effective in reducing adhesive blush, there are many situations and situations in which the use of solvents is undesirable and / or inadmissible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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

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PUM

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Abstract

Water resistant, low haze acrylic emulsion pressure sensitive adhesive compositions for use in decorative, light management or optical articles are disclosed. These emulsion pressure sensitive adhesives comprise (a) 50-90% by weight n-butyl acrylate, and (b) 10-50% by weight 2-hydroxy ethyl acrylate, or 2-hydroxy ethyl methacrylate, hydroxy propyl acrylate monomer, or mixtures thereof. These emulsion pressure sensitive adhesives can be used in wet lamination processes, and exhibit less than 2% increase in haze, less than 2% increase in opacity and greater than 95% transmittance after the wet lamination process.

Description

field of invention [0001] This invention relates to pressure sensitive adhesives, and more particularly to water resistant, low haze acrylic emulsion (latex) pressure sensitive adhesives for use with decorative, lighting control or optical articles. Background of the invention [0002] Water-based emulsion polymers (ie, latexes) are known to be water-sensitive due to the use of surfactants and other water-soluble materials. Emulsion polymers are often hazy under high humidity or wet conditions, and hazy emulsions are described in the literature as "cloudy", "milky" and "white" . A number of methods have been used and reported in the literature to prevent or reduce haze in emulsion polymers. These methods involve the use of polymerizable surfactants, surfactant-free emulsion polymerization methods, selection of replacement monomers and initiators, control of the pH of emulsion systems, and the like. [0003] One use of emulsion polymers, particu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/06C08F220/18C08F220/28C09J4/00C09J4/02C09J4/06C09J133/00C09J133/14
CPCY10S526/931C09J4/00C09J4/06C08F265/06C08F220/20C08F220/1804C09J133/08C09J133/066C09J11/06
Inventor 杨杰卢盈裕J·E·克罗普
Owner 3M CO
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