Typical Formulation Ingredients
Ingredient
Parts by weight
Methyl methacrylate monomer
Chlorosulphonated polyethylene toughening elastomer (Hypalon 30 from Dupont Performance Polymers)
Acrylic impact modifier (Paraloid KM 753 from Dow Chemical)
Methacrylic acid adhesion promoter
Cumene hydroperoxide initiator
2,6, Di-t-butyl-4-methylphenol stabiliz
Aniline butyraldehyde (e.g., Vanax 808 HP, R.T. Vanderbilt Company, Inc.)
Acrylic impact modifier (Paraloid KM 330 from Dow Chemical)
Acrylic-styrene-acrylonitrile resin (Geloy 1020 from Sabic)
(Source: US Patent 4,942,201)
Typical Properties
Mix ratio
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Glass transition temperature, °C
Tensile strength at break, psi
Resulting Properties
The cure of acrylic adhesives is initiated by a two-part redox reaction system. One component of the redox reaction is present in the base component of the adhesive, and the second component is present in the accelerator or “curing” component. Various tougheners have been used in thermosetting acrylic adhesives. A very common toughener is chlorosulphonated polyethylene (Hypalon, from DuPont-Dow). Strong acids such as acrylic, methacrylic, or maleic acid are used to enhance adhesion to metal and plastic surfaces.
This formulation uses the addition of core-shell block and graft polymers (Paraloid and Geloy), which swell in size in the adhesive formulation but do not dissolve. These additives give improved spreading and flow properties to the adhesive.