PROCESS FOR FRONTAL POLYMERIZATION OF CATIONICALLY POLYMERIZABLE MONOMERS

• US 20190309123A1
• Filed: 09/02/2016
• Published: 10/10/2019
• Est. Priority Date: 09/02/2015
• Status: Active Grant

• Current Assignee: Technische Universitã¤T Wien
• Original Assignee: Technische Universitã¤T Wien
• Inventors: LISKA, Robert, BOMZE, Daniel, KERN, Wolfgang, KNAACK, Patrick
• Granted Patent: US 10,738,146 B2
• Time in Patent Office: Days
• CPC Class Codes: C08G 59/245 aromatic
• CPC Class Codes: C08G 59/4085 silicon containing compounds
• CPC Class Codes: C08G 59/68 characterised by the catalysts used
• CPC Class Codes: C08G 65/105 Onium compounds

Abstract

The invention relates to a process for free radical-induced cationic frontal polymerization of cationically polymerizable monomers using a combination of at least one cationic polymerization initiator and at least one activator for said at least one initiator, characterized in that benzopinacol is used as said activator.

Claims

1. A process for free radical-induced cationic frontal polymerization of cationically polymerizable monomers comprising using a combination of at least one cationic polymerization initiator and at least one activator for the at least one initiator,

wherein benzopinacol is used as the activator.

3. The process according to claim 1, wherein the cationic polymerization initiators are selected from iodonium, phosphonium, sulfonium, ferrocenium and diazonium salts and aryl-substituted representatives thereof.

4. The process according to claim 3, wherein a diaryliodonium salt is used as the cationic polymerization initiator.

5. The process according to claim 4, wherein (4-octyloxyphenyl)(phenyl)iodonium-hexafluoroantimonate, (4-isopropylphenyl)(4′

-methylphenyl)iodonium-tetrakis(pentafluorophenyl)borate, or diphenyliodonium-tetrakis(perfluoro-t-butyloxy)aluminate is used as the cationic polymerization initiator.

6. The process according to claim 5, wherein diphenyliodonium-tetrakis(perfluoro-t-butyloxy)aluminate is used as the cationic polymerization initiator.

7. The process according to claim 1, wherein the cationic polymerization is carried out as a ring-opening polymerization.

8. The process according to claim 7, wherein mono-oder multivalent epoxides (oxiranes), thiiranes (episulfides), oxetanes, lactames, lactones, lactide, glycolide, tetrahydrofurane, or mixtures thereof are used as the cationically polymerizable monomers.

9. The process according to claim 8, wherein one or more multivalent epoxides are used as the cationically polymerizable monomers.

10. The process according to claim 1, wherein one or more multivalent vinyl ethers are used as the cationically polymerizable monomers.

11. The process according to claim 1, wherein a mixture of cationically and radically polymerizable monomers is polymerized, optionally with the addition of a further free radical initiator.

12. The process according to claim 1, wherein one or more additional components selected from further photoinitiators, sensitizers, stabilizers, modifiers, regulators, solvents, fillers, dyes, pigments, and mixtures thereof are used.

2. A process of free radical-inducted cationic frontal polymerization of cationically polymerizable monomers comprising using benzopinacol as an activator for cationic polymerization initiators.