Acrylic syrup preparation method and acrylic syrup

Patent metadata

Field	Value
Publication number	US-10131728-B2
Application number	US-201515509693-A
Country	US
Kind code	B2
Filing date	Sep 23, 2015
Priority date	Sep 29, 2014
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

Provided is an acrylic syrup preparation method including the steps of: performing bulk photopolymerization by initiating a UV irradiation of a composition containing a photoinitiator and one or more types of acrylic monomers; stopping the UV irradiation at the time point when the temperature is increased by about 5° C. to about 40° C. from the time point when the temperature at which the UV irradiation of the composition is initiated; and purging the composition with an oxygen-containing inert gas after the UV irradiation is stopped.

First claim

The invention claimed is:

1. An acrylic syrup preparation method, comprising the steps of:
performing bulk photopolymerization by initiating a UV irradiation of a composition containing a photoinitiator and one or more types of acrylic monomers;
stopping the UV irradiation at the time point when the temperature is increased by about 5° C. to about 40° C. from the time point when the temperature at which the UV irradiation of the composition is initiated; and
purging the composition with an oxygen-containing inert gas after the UV irradiation is stopped,
wherein the composition does not comprise a molecular weight adjusting agent.

2. The acrylic syrup preparation method of claim 1 , wherein the oxygen-containing inert gas contains oxygen in an amount of about 10 vol % to about 30 vol %.

3. The acrylic syrup preparation method of claim 1 , wherein stirring is carried out at least while the composition is purged with the oxygen-containing inert gas.

4. The acrylic syrup preparation method of claim 1 , wherein the composition is purged with the oxygen-containing inert gas until the time point when the temperature of the composition reaches at least about 20° C. to about 50° C.

5. The acrylic syrup preparation method of claim 1 , wherein the acrylic monomers is polymerized at a conversion rate of about 4% to about 20% until the time point when the UV irradiation is stopped.

6. The acrylic syrup preparation method of claim 1 , wherein an acrylic polymer having a weight average molecular weight of about 1,000,000 g/mol to about 20,000,000 g/mol is formed by the bulk photopolymerization until the time point when the UV irradiation is stopped.

7. The acrylic syrup preparation method of claim 1 , wherein a nitrogen purging of the composition is started and carried out from before the UV irradiation is initiated.

8. The acrylic syrup preparation method of claim 7 , wherein stirring is carried out at least while the composition is purged with nitrogen.

9. The acrylic syrup preparation method of claim 1 , wherein the temperature of the composition is set to about −10° C. to about 80° C. when the time point when the UV irradiation is initiated.

10. The acrylic syrup preparation method of claim 1 , further comprising: the step of preparing the composition by mixing the photoinitiator in an amount of about 0.001 part by weight to about 1 part by weight based on about 100 parts by weight of the one or more types of acrylic monomers.

11. The acrylic syrup preparation method of claim 1 , wherein the one or more types of acrylic monomers comprise one selected from the group consisting of a (meth)acrylic acid ester-based monomer which comprises an alkyl group having 1 to 15 carbon atoms; a (meth)acrylic acid ester-based monomer which comprises a hydroxy group, a carboxyl group, and an amine group; and a combination thereof.

12. The acrylic syrup preparation method of claim 1 , wherein the photoinitiator absorbs light with a wavelength of about 100 nm to about 400 nm.

13. An acrylic syrup which does not comprises a molecular weight adjusting agent, and is prepared by means of bulk photopolymerization by the acrylic syrup preparation method according to claim 1 .

14. The acrylic syrup of claim 13 , wherein the acrylic syrup comprises an acrylic polymer having a weight average molecular weight of 1,000,000 g/mol to 20,000,000 g/mol.

15. The acrylic syrup of claim 13 , wherein the acrylic polymer has a polydispersity index of 1.98 to 10.

16. The acrylic syrup of claim 13 , wherein the acrylic syrup has a conversion rate of 4% to 20%.

17. The acrylic syrup of claim 13 , wherein the acrylic syrup has a viscosity of 1,000 cps to 100,000 cps at 20° C.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Jun-Man
• Kim Jang-Soon

Classifications

• C08F220/1806

  C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title

• C08F20/18

  with acrylic or methacrylic acids · CPC title

• C08F2/50

  with sensitising agents · CPC title

• C08F2/48

  by ultraviolet or visible light · CPC title