July 2019 – Paul Wu's Blog

PSA for use on low energy surfaces

US patent 5874143 teaches a method to make PSAs for use on low energy surfaces.

Glass transition temperature (Tg) of acrylates

The following figures include some glass transition temperature, Tg, for different Acrylates.

Stretch releasing tape-2

WO1995006691A1 teaches how to make a conformable pressure sensitive adhesive tapes which comprise a layer of polymeric foam in the backing and may be adhered firmly to a substrate and thereafter removed therefrom after only being stretched at an angle no greater than about 35° from the surface of the substrate.

Stretch de-bondable tape-1

US005516581A teaches a method to make a stretchable de-bondable tape, where the tape carrier is a highly extensible film (or others) with low elastic recovery (preferably less than 30%). This property could be useful for the indication of tampering and ensureing single use in certain applications.

Literature study-F containing UVR formulation

US 8,193,259 B2, with title of “UV-CURABLE PRESSURE-SENSITIVE ADHESIVE COMPOSITION WITH A FLUORINATED ACRYLIC BINDER RESINAND PRESSURE-SENSITIVE ADHESIVE FILM USING THE SAME”, teaches a way to formulate UV Release (UVR) adhesive formulation where a fluorinated acrylic segment is introduced to the main chain to deliver excellent pick-up performances after UV illumination.

UVR Formulation-Literature study

Application of US2009/0075008A1 teaches a method how to formulate a UV releasable adhesive.

Photoinitiator

According to the radical generation mechanisms, radical photoinitiators can be divided into three categories:

Polymeric Photoinitiator

Polymeric photo initiators have at least two advantages: (1) low migration rate due to their long polymer chain compared with small molecular counterparts; (2) higher cross linking efficiency since only one step reaction is needed to form bridges between two polymer chains, while small molecular initiators need two steps.

Wet Tensile Tests

Wet tensile strength of a sample is important to evaluate the mechanic performances subjected to moisture and stress during processing or use. It is particularly useful for measuring paper and other materials which are easily damaged by handling when wet.

Paper type for PSA industry

Paper are broadly used in PSA industry ad carrier for PSA or release liner. According to Alexander Watson & Associates, the following are the market share for different types of paper and plastic films used in release liner in PSA industry worldwide in 2013.