Process for removal of volatile compounds from tackifiers

Patent metadata

Field	Value
Publication number	US-11498997-B2
Application number	US-201916963681-A
Country	US
Kind code	B2
Filing date	Jan 23, 2019
Priority date	Feb 2, 2018
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

Process for the removal of volatile compounds from a tackifier comprising a resin with repeating units of formula I wherein R 1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R 2 is a linear or branched, saturated or unsaturated N aliphatic hydrocarbon group with up to 20 carbon atoms, and optionally a plasticizer, wherein the tackifier is passed through at least one evaporator as film and the volatile compounds are removed from the film.

First claim

The invention claimed is:

1. A process for removing a volatile compound from a tackifier, comprising
a resin with repeating units of the following formula I

wherein R 1 is a linear or branched alkylene group with 1 to 10 carbon atoms and R 2 is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with up to 20 carbon atoms, and

optionally a plasticizer,
the process comprising passing the tackifier through at least one evaporator as a film and removing the volatile compound from the film,
wherein said volatile compound comprise a compound of formula R 2 —C 6 H 4 —OH where R 2 is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with up to 20 carbon atoms.

2. The process of claim 1 , wherein R 1 in formula I is CH 2 or HC—CH 3 or H 2 C—CH 2 .

3. The process of claim 1 , wherein R 2 in formula I is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with 4 to 10 carbon atoms.

4. The process of claim 1 , wherein the resin is obtainable by reacting acetylene and para tertiary butyl phenol.

5. The process of claim 1 , wherein the tackifier comprises a plasticizer.

6. The process of claim 5 , wherein the plasticizer is a non-aromatic compound comprising at least 50% by weight of one or more linear or branched, saturated or unsaturated aliphatic hydrocarbon groups with at least 4 carbon atoms.

7. The process of claim 6 , wherein the non-aromatic compound comprises at least 80% by weight of linear or branched, saturated or unsaturated, aliphatic hydrocarbon groups with from 10 to 60 carbon atoms.

8. The process of claim 6 , wherein the non-aromatic compound is selected from the group consisting of:
linear or branched, saturated or unsaturated aliphatic hydrocarbons;
oligomers obtained by reacting unsaturated aliphatic hydrocarbons with unsaturated dicarboxylic acids, dicarboxylic acid anhydrides or dicarboxylic acid amides;
saturated or unsaturated fatty alcohols;
saturated or unsaturated fatty acids;
esters of saturated or unsaturated fatty alcohols with mono-, di-, tri- or tetra carboxylic acids, including saturated or unsaturated fatty acids;
esters of saturated or unsaturated fatty acids with alcohols other than saturated or unsaturated fatty alcohols, and
saturated or unsaturated fatty acid anhydrides or amides.

9. The process of claim 1 , wherein the tackifier comprises 0.1 to 50 parts by weight of the plasticizer per 100 parts by weight of the resin.

10. The process of claim 1 , wherein the tackifier comprises at least 80% by weight of the resin and the plasticizer.

11. The process of claim 1 , wherein the tackifier has a glass transition temperature of 50 to 120° C.

12. The process of claim 1 , wherein the tackifier is passed through an evaporator as a film having a thickness of 0.01 to 20 mm.

13. The process of claim 1 , wherein said tackifier is passed through an evaporator at a temperature of at least 150° C.

14. The process of claim 13 . where said tackifier is passed through said evaporator at a pressure of 0.1-100 mbar.

15. The process of claim 1 , wherein said tackifier is passed through an evaporator at a temperature of 190 to 220° C.

16. The process of claim 1 , wherein the at least one evaporator is a falling film evaporator.

17. The process of claim 1 , wherein the process is a multistage process, employing more than one evaporator in serial.

18. The process of claim 1 , wherein the process is a two-stage process wherein the tackifier is fed to a first evaporator and then passed in a molten stage to a second evaporator.

19. The process of claim 1 , wherein an average residence time of the tackifier in the at least one evaporator is in total from 1 to 30 minutes.

20. The process of claim 1 , wherein after passing through said at least one evaporator as a film, said tackifier has a content of said volatile compound of less than 2000 ppm.

Assignees

• Basf Se

Inventors

• Yu Miran
• Lang Ortmund
• Rodewald Dieter
• Schlitter Stephan
• Scherr Guenter
• Westerhaus Felix Alexander

Classifications

• C08F8/12

  Hydrolysis · CPC title

• C08F238/02

  Acetylene · CPC title

• C08J11/02

  of solvents, plasticisers or unreacted monomers · CPC title

• B01D53/00

  Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols, (recovery of volatile solvents by condensation B01D5/00; sublimation B01D7/00; cold traps, cold baffles B01D8/00; working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00; cleaning coal gas C10K; working-up of natural gas, or synthetic natural gas, C10L3/10; separation of difficult-to-condense gases or air by liquefaction F25J; for investigating materials G01N30/00) · CPC title

• C08F6/005 Primary

  from solid polymers · CPC title