Method for producing a release agent, a release agent and use of the release agent

Patent metadata

Field	Value
Publication number	US-2025163292-A1
Application number	US-202418948621-A
Country	US
Kind code	A1
Filing date	Nov 15, 2024
Priority date	Nov 22, 2023
Publication date	May 22, 2025
Grant date	—

Abstract

A method for producing a release agent ( 2 ), wherein the method comprises at least the following steps: a) providing a reactive mixture, comprising a carboxylic-acid-containing monomer component, which comprises, preferably and/or consists of itaconic acid and/or itaconic acid derivatives; b) polymerizing the reactive mixture to form a polymer solution, wherein the polymer solution comprises a polymer which is at least partially dissolved in a solvent and which contains the carboxylic-acid-containing monomer component, c) obtaining a release agent ( 2 ) comprising the polymer solution, wherein CO 2 can be liberated from the release agent, preferably the polymer of the release agent, by decarboxylation; as well as a release agent ( 2 ) and a use of the release agent ( 2 ).

First claim

1 . A method for producing a release agent, wherein the method comprises at least the following steps:
a) providing a reactive mixture, comprising a carboxylic-acid-containing monomer component, which comprises itaconic acid and/or itaconic acid derivatives, b) polymerizing the reactive mixture to form a polymer solution, wherein the polymer solution comprises a polymer which is at least partially dissolved in a solvent and which contains the carboxylic-acid-containing monomer component, c) obtaining a release agent comprising the polymer solution, wherein CO 2 can be liberated from the release agent by decarboxylation.

2 . The method according to claim 1 , wherein the polymer solution and/or the release agent comprise and/or consist of biogenic constituents and/or are biodegradable and/or compostable.

3 . The method according to claim 1 , wherein the release agent forms the CO 2 after arrangement on at least one surface of a mold element.

4 . The method according to claim 1 , wherein the carboxylic-acid-containing monomer component of the reactive mixture contains, besides itaconic acid and/or itaconic acid derivatives, at least one further carboxylic-acid-containing monomer component, which is selected individually or in combination from the group which consists of acrylic acid, methacrylic acid, fumaric acid and maleic acid.

5 . The method according to claim 1 , wherein the proportion of monomer of the carboxylic-acid-containing monomer component, relative to the total mass of the reactive mixture, is selected from a range of from 2.5 wt.-% to 65 wt.-%.

6 . The method according to claim 1 , wherein the reactive mixture contains at least one non-carboxylic-acid-containing monomer component which is selected individually or in combination from the group which consists of acrylamide, esters of acrylic acid, esters of methacrylic acid, esters of itaconic acid, esters of maleic acid, maleic acid anhydride, terpenes and/or combinations thereof.

7 . The method according to claim 1 , wherein the proportion of monomer of the non-carboxylic-acid-containing monomer component, relative to the total mass of the reactive mixture, is selected from a range of from 5 wt.-% to 50 wt.-%.

8 . The method according to claim 1 , wherein the carboxylic-acid-containing monomer component and/or the non-carboxylic-acid-containing monomer component comprise and/or consist of biogenic constituents, and/or are biodegradable and/or are compostable.

9 . The method according to claim 1 , wherein the reactive mixture contains a solvent which is selected individually or as mixtures from the group which consists of ethanol, 1-propanol, 2-propanol, acetone, 2-butanone (MEK), acetate.

10 . The method according to claim 1 , wherein the reactive mixture contains a solvent which comprises and/or consists of water.

11 . The method according to claim 1 , wherein the proportion of the solvent, relative to the total mass of the reactive mixture, is selected from a range of from 15 wt.-% to 95 wt.-%.

12 . The method according to claim 1 , wherein the reactive mixture comprises an initiator.

13 . The method according to claim 12 , wherein the proportion of the initiator, relative to the total mass of the reactive mixture, is selected from a range of from 0.05 wt.-% to 1.5 wt.-%.

14 . The method according to claim 12 , wherein the initiator is selected from the group which consists of azo compounds, peroxides or mixtures thereof.

15 . The method according to claim 1 , wherein step b) is carried out at a temperature of the reactive mixture selected from a range of from 20° C. to 110° C.

16 . The method according to claim 1 , wherein the solvent of the polymer solution comprises and/or substantially consists of water.

17 . The method according to claim 1 , wherein the polymer is water-soluble.

18 . The method according to claim 1 , wherein the polymer contains the carboxylic-acid-containing monomer component selected from a range of from 25 wt. % to 100 wt. %.

19 . The method according to claim 1 , wherein the polymer contains the non-carboxylic-acid-containing monomer component, selected from a range of from more than 0 wt.-% to 75 wt.-%.

20 . The method according to claim 1 , wherein the polymer contains an initiator, selected from a range of from 0.05 wt.-% to 2 wt.-%.

21 . The method according to claim 1 , wherein the polymer has a value for a glass transition temperature which is selected from a range of from −20° C. to 110° C.

22 . The method according to claim 1 , wherein CO 2 can be liberated from the release agent independently of its moisture content.

23 . The method according to claim 1 , wherein the release agent contains an indicator, whereby the release agent in a dry state has a different color impression compared with a moist state.

24 . The method according to claim 23 , wherein the indicator has a color impression in the moist state of the release agent and the indicator is colorless in the dry state of the release agent.

25 . The method according to claim 23 , wherein the indicator is selected from one or more leuco dyes.

26 . The method according to claim 1 , wherein the release agent comprises a flow additive.

27 . The method according to claim 1 , wherein the release agent comprises a thickener.

28 . The method according to claim 1 , wherein the release agent comprises the polymer solution selected from a range of from 0.01 wt.-% to 100 wt.-%.

29 . The method according to claim 1 , wherein the solvent of the release agent comprises and/or substantially consists of water.

30 . The method according to claim 1 , wherein the release agent comprises solvent selected from a range of from more than 0 wt.-% to 99.99 wt.-%.

31 . The method according to claim 1 , wherein the release agent has a dynamic viscosity which is selected from a range of from 1 mPas to 300 Pas.

32 . The method according to claim 1 , wherein the release agent contains no dispersion additive and/or emulsion additive and/or wherein the release agent contains no polychlorinated biphenyls and/or wherein the release agent contains no refined oils and/or fats, biogenic oils and/or fats.

33 . The method according to claim 1 , wherein, after an the at least partial solidification and/or a hardening of a mineral molded body, the surface of the a mineral molded body brought into contact with the release agent is designed such that the surface area of holes and/or shrink holes, relative to the total surface area, is less than 5%.

34 . The method according to claim 1 , wherein the decarboxylation of the release agent is initiated by the contact of the release agent with a flowable or plastically deformable mineral construction material mixture.

35 . The method according to claim 1 , wherein the decarboxylation is ionically catalyzed.

36 . A release agent comprising a polymer at least partially dissolved in a solvent, wherein the polymer contains a carboxylic-acid-containing monomer component which comprises itaconic acid and/or itaconic acid derivatives,
and wherein CO 2 can be liberated from the release agent by decarboxylation.

Assignees

• Leonhard Kurz Stiftung & Co Kg

Inventors

• Knoop Mats Timothy
• Ludwig Johannes

Classifications

• C10N2040/36

  Release agents {or mold release agents} · CPC title

• C10M2205/04

  containing aromatic monomers, e.g. styrene · CPC title

• C10M2205/028

  containing aliphatic monomers having more than four carbon atoms · CPC title

• C10M2209/04

  containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical · CPC title

• C10M2209/086

  polycarboxylic, e.g. maleic acid · CPC title