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AssigneesDenki Kagaku Kogyo Kabushiki Kaisha, Polymatech Co., Ltd.
InventorsNobuyuki Ootsuka, Kunio Iriuchijima, Tetsuya Sakurai, Kengo Nishi
Estimating the term…
The present invention provides an active energy ray-curing adhesive composition that has high curing rate as well as excellent adhesion and bonding workability, and a keypad (11) for push-button switches that has not only high bonding rate of a hard resin keytop (20) to a base portion (12) but also has excellent adhesion and excellent bonding workability in the bonding step. The active energy ray-curing adhesive composition includes a urethane (meth) acrylate, a (meth)acrylamide compound, and a hydroxyl group-containing (meth)acrylate. Optionally, the composition may further contain particulate silicic anhydride, and at least one of a tertiary amine salt and a tertiary amine. In the keypad (11) for push-button switches, the hard resin keytop (20) is fixed to the base portion (12) made of a rubbery elastic material through an adhesive layer (19) made of the adhesive composition.
An active energy ray-curing adhesive composition comprising a urethane (meth) acrylate, a (meth) acrylamide compound, and a hydroxyl group-containing (meth)acrylate.
A keypad for a push-button switch comprising a base portion made of a rubbery elastic material and a keytop portion made of a hard resin and fixed to the base portion,
Dependencies are inferred from the claim text.
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Polyurethanes having carbon-to-carbon unsaturated bonds: having terminal carbon-to-carbon unsaturated bonds
Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives: using…
Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon
Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one…: homopolymers…
Term end not estimated
1. Field of the Invention
The present invention relates to an adhesive composition relating to adhesion of plastics and to a keypad for use in push-button switches with the adhesive composition.
2. Description of the Related Art
In the accompanying drawings:
FIG. 1 is a schematic longitudinal cross-sectional view showing a keypad for push-button switches according to the present invention;
FIGS. 2A and 2B show a variation of a hard resin-made keytop for use in the keypad for push-button switches according to the present invention, in which FIG. 2A is a bottom view showing a variation of a hard resin-made keytop for use in the keypad for push-button switches according to the present invention, and FIG. 2B is a cross-sectional view taken along the line SA-SA in FIG. 2A;
Hereinafter, the present invention will be described in detail by embodiments.
Embodiments of Adhesive Composition
In one embodiment, an active energy ray-curing adhesive composition of the present invention includes a urethane (meth)acrylate (Component (1)), a (meth)acrylamide compound (Component (2)), and a hydroxyl group-containing (meth)acrylate (Component (3)). In another embodiment, the active energy ray-curing adhesive composition of the present invention includes a urethane (meth)acrylate (Component (1)), a (meth)acrylamide compound (Component (2)), a hydroxyl group-containing (meth)acrylate (Component (3)), a particulate silicic anhydride (Component (4)), and at least one of a tertiary amine salt or a tertiary amine (Component (5)). Hereinafter, these components will be described in detail.