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Photoinitiators that are polymeric or polymerizable for use in UV curable pressure sensitive adhesives

By using UV-curable photoinitiators to functionalize acrylate polymers in hot-melt pressure-sensitive adhesives, the problem of hot melt viscosity instability is solved, a balance between high and low molecular weights is achieved, and significantly improved Improved viscosity stability and adhesive properties.

Active Publication Date: 2018-01-02
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid increase in viscosity over a short period of time reduces the ability to apply the HMPSA to the substrate, so the pot life of a typical HMPSA is very low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] In the present description and claims, the following abbreviations apply. Hot Melt Pressure Sensitive Adhesive (HMPSA); Pressure Sensitive Adhesive (PSA); Gram (g); Milligram (mg); Part per million (ppm); Millimole (mmol); Liter (L); Milliliter (ml); Fahrenheit (F); Celsius (C); Ultraviolet (UV); Ultraviolet C (UVC); Polymers or copolymers unless otherwise stated.

[0057] "Alkyl" or "alkane" means a hydrocarbon chain or group containing only single bonds between chain carbon atoms. Alkanes can be linear hydrocarbon chains or branched hydrocarbon groups. The alkanes may be cyclic. The alkanes may contain 1-20 carbon atoms, preferably 1-10 carbon atoms, more preferably 1-6 carbon atoms. In some embodiments, the alkanes can be substituted. Exemplary alkanes include methyl, ethyl, n-propyl, isopropyl, isobutyl, n-butyl, sec-butyl, tert-butyl, isopentyl, neopentyl, tert-pentyl, isohexyl, and decyl base.

[0058] "Alkenyl" or "alkene" means a hydrocarbon chain or grou...

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Abstract

Disclosed are photoinitiators that are ultra violet (UV) reactive. The photoinitiators can be polymerized into polymeric backbones for use in UV curable hot melt pressure sensitive adhesives. The preferred polymeric backbones are acrylic-based polymers. The photoinitiators are very UVC sensitive and have excellent hot melt viscosity stability that is many fold higher than existing photoinitiators.The subject photoinitiators feature aryl ketones linked through an ether linkage to a variety of connector sequences that allow for polymerization of the photoinitiators.

Description

technical field [0001] The present invention relates generally to pressure sensitive adhesives, and more particularly to polymerizable photoinitiators or polymeric photoinitiators for use in UV curable hot melt pressure sensitive adhesives. Background technique [0002] Ultraviolet (UV) curable pressure sensitive adhesives have been successfully used in labels and tapes for many years. Typically, the pressure sensitive adhesive (PSA) is a polyacrylate based PSA. Polyacrylates offer several advantages over other adhesives because they are highly stable to the abundant UV light, oxygen and ozone found in the environment. Synthetic and natural rubber adhesives often contain double bonds, which makes these adhesives unstable to the aforementioned environmental influences. Other advantages of polyacrylates include their transparency and workability over a relatively wide temperature range. [0003] Polyacrylate PSAs are typically prepared by free-radical polymerization of acry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C08G65/26C08G65/28C08G65/40C08G63/16C08G63/08C08G63/68C08G63/12C08G64/04C08G64/16C08G64/02C08G67/00C08F220/06C08F220/30C08F220/38C09D4/04C09D4/06C09D133/08C09D133/10C09J133/08C08F2/48C08F2/50
CPCC07C69/54C08F2/50C09J133/08C07C323/12C09J4/06C09J133/14C09J4/00C08F220/1804C08F220/14C08F220/1808C08F220/06C08F220/302C08F220/382C07C323/56C09J11/06C08K5/37C09J2301/302C09J2301/304C09J133/10C08F2/48C08F283/02C08F283/065C08K5/0025B32B2037/1215C08F2/46
Owner HENKEL KGAA