Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Urethane-based pressure-sensitive adhesive and pressure-sensitive adhesive sheet

A technology of urethane and adhesive, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of reduced re-peelability, poor re-peelability, bad conditions, etc., and achieve hardening Good properties, good re-peelability, and the effect of reducing adhesion

Active Publication Date: 2020-04-17
TOYO INK SC HOLD CO LTD +1
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although acrylic adhesives have excellent adhesive force, they have poor re-peelability after being attached to the adherend due to strong adhesive force
In particular, after time passes in a (humid) heat environment, the re-peelability is further reduced due to an increase in the adhesive force, and the adherend contamination is likely to occur in which the adhesive remains on the surface of the adherend after re-peeling. tendency
Silicone-based adhesives tend to contaminate the adherend, and the silicone resin with low molecular weight volatilizes and adsorbs on the surface of electronic components and other equipment, which may cause problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Urethane-based pressure-sensitive adhesive and pressure-sensitive adhesive sheet
  • Urethane-based pressure-sensitive adhesive and pressure-sensitive adhesive sheet
  • Urethane-based pressure-sensitive adhesive and pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0237] Hereinafter, synthesis examples, examples of the present invention, and comparative examples will be described. In addition, in the following description, unless otherwise specified, "part" means a mass part, "%" means a mass %, and "RH" means a relative humidity.

[0238] [Measurement of Mn and Mw]

[0239] The number average molecular weight (Mn) and weight average molecular weight (Mw) are measured by the gel permeation chromatography (GPC) method. The measurement conditions are as follows. In addition, both Mn and Mw are values ​​in terms of polystyrene.

[0240]

[0241] Device: Shimadzu Prominence (SHIMADZU Prominence) (manufactured by Shimadzu Corporation),

[0242] Column: Two LF-804 manufactured by Shodex are connected in series,

[0243] Detector: Differential Refractive Index Detector (RID-10A),

[0244] Solvent: tetrahydrofuran (THF),

[0245] Flow rate: 1mL / min,

[0246] Solvent temperature: 40°C,

[0247] Sample concentration: 0.2%,

[0248] Sam...

Synthetic example 1

[0286] (Synthesis example 1) (1-stage polymerization method)

[0287] 5 parts by mass of active hydrogen group-containing compound (HX-11) and 95 parts by mass of active hydrogen group-containing compound (HX-18) were put into a four-necked flask equipped with a stirrer, a reflux cooling pipe, a nitrogen gas introduction pipe, a thermometer, and a dropping funnel. Parts by mass, 1.6 parts by mass of polyisocyanate (N-11), 67 parts by mass of toluene, 0.020 parts by mass of dioctyltin dilaurate as a catalyst, and 0.008 parts by mass of tin 2-ethylhexanoate were mixed. The temperature of the internal solution was gradually raised to 75° C., and the reaction was performed for 3 hours.

[0288] The ratio of the number of moles of isocyanate groups in the polyisocyanate (N) used in the reaction to the total number of moles of active hydrogen groups in all active hydrogen group-containing compounds (HX) used in the reaction (NCO / H ratio) was 0.49.

[0289] After the disappearance ...

Synthetic example 13

[0295] (Synthesis Example 13) (Multistage Polymerization Method)

[0296] 100 parts by mass of compound (HX-13) containing active hydrogen group, 17 parts by mass of polyisocyanate (N-13), toluene 29.3 parts by mass and 0.01 part by mass of dioctyltin dilaurate as a catalyst were mixed. The temperature of the internal solution was gradually raised to 100° C., and the reaction was performed for 2 hours. Then, after cooling to 25 degreeC and adding 90.7 mass parts of ethyl acetates and 0.5 mass parts of acetylacetones, 3.4 mass parts of active hydrogen group containing compounds (HX-21) were dripped over 1 hour. After maintaining the liquid temperature at 25°C and continuing the reaction for 1 hour, 1.2 parts by mass of an active hydrogen group-containing compound (HX-22) was added and reacted. After the disappearance of the remaining isocyanate groups was confirmed by infrared spectroscopic analysis (IR analysis), the reaction was terminated.

[0297] In this way, a colorles...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
gel fractionaaaaaaaaaa
Login to View More

Abstract

The present invention provides a pressure-sensitive adhesive capable of forming a pressure-sensitive adhesive layer that ensures reduction in adhesive power and favorable removability even during an initial period (prior to passing of time) and after passing of time (in particular, after a (wet) heated time period), and that leaves less taint on an adherend after being removed. The pressure-sensitive adhesive according to the present invention is a urethane-based pressure-sensitive adhesive comprising: at least one type of active hydrogen group-containing compound (H) having a plurality of active hydrogen groups per molecule; at least one type of multifunctional isocyanate compound (I); and at least one type of surfactant (S) having a cationic hydrophilic group, wherein the surfactant (S)has an amine value of 0.1-150 mgKOH / g in terms of nonvolatile contents, and the contained amount of the surfactant (S) is 0.01-20 parts by mass with respect to 100 parts by mass of the active hydrogengroup-containing compound (H).

Description

technical field [0001] The present invention relates to a urethane adhesive and an adhesive sheet. Background technique [0002] Conventionally, an adhesive sheet in which an adhesive layer is formed on a base sheet has been widely used as a surface protection sheet for various members. As the adhesive, there are acrylic adhesives, silicone adhesives, urethane adhesives, and the like. Acrylic adhesives are excellent in adhesive force, but have poor re-peelability after being attached to an adherend due to strong adhesive force. In particular, after time passes in a (humid) heat environment, the re-peelability is further reduced due to an increase in the adhesive force, and the adherend contamination is likely to occur in which the adhesive remains on the surface of the adherend after re-peeling. tendency. Silicone-based adhesives tend to contaminate the adherend, and the silicone resin with a low molecular weight volatilizes and adsorbs on the surface of electronic compon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J7/38C09J11/06
CPCC09J11/06C09J7/38C09J175/04C09J7/20C09J2301/312
Inventor 户根嘉孝斋藤秀平田邉慎吾
Owner TOYO INK SC HOLD CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com