Adhesive release agent

Tape and adhesive sheets are made by forming an adhesive on the surface of the substrate. They are usually rolled into a roll and stored. In this case, the back surface of the substrate is usually coated with a release agent to protect the adhesive surface of the tape or adhesive sheet. It can be easily unwound when using tape or adhesive pieces. Alternatively, the adhesive surface is covered with a separate substrate coated with a release agent, thereby protecting the adhesive surface.

Various types of release agents are known. In particular, long-chain alkyl release agents (long-chain alkyl release agents) can be used in the electronics industry because they are less expensive and less likely to cause contamination.

An example of a long-chain alkyl release agent is published in the pamphlet International Bulletin W001/64805 and/or Publication (Japan’s unexamined Patent Bulletin)NO2001-240775. All kinds of long-chain alkyl release agent are acrylic release agent, which contains the product obtained before the acrylic release agent system with ultraviolet radiation, the precursor contains poly (methyl) acrylic cool, in 20C and 1Hz frequency of its energy storage elastic modulus of 1X102-3X10Pa, among which, the acrylic release agent has a contact Angle of 15° or greater against a mixture of methanol and water (volume ratio 90/1) with a wetting tension of 25.4N/m. After being applied to the substrate, the acrylic release agent to the substrate prepared by polyethylene terephthalate high adhesion. This acrylic release agent can keep the stripping force of pressure-sensitive adhesives such as acrylic pressure sensitive adhesives low even when placed at high temperatures. Moreover, this acrylic release agent basically has no effect on the adhesive residual adhesion.

It is obvious from the above instructions that the acrylic release agent is prepared by the steps of irradiating the acrylic release agent precursor with ultraviolet radiation. However, the UV dose required in this step varies greatly with the composition of the precursor of the acrylic release agent. When comparing compositions requiring a small dose to form a release agent with compositions requiring a large dose, the dosage sometimes varies by a factor of 3 to 5.