Cleaning agent for washing out silicone stain

Patent metadata

Field	Value
Publication number	US-10035974-B2
Application number	US-201414778685-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Mar 25, 2013
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

The objective of the present invention is to provide a cleaning agent composition which can be used in the open air without any problems since the cleaning agent is environmentally friendly and which is effective for removing a low-molecular-weight and poorly-water-soluble cyclic silicone compound that causes a stain of a silicone sealing. The cleaning agent for washing out a silicone stain according to the present invention is characterized in comprising a cyclic lipopeptide biosurfactant, wherein the specific silicone stain compound such as D4 compound is the objective compound to be removed.

First claim

The invention claimed is:

1. A method for removing a silicone stain, comprising the step of washing out the silicone stain adhered on the surface of an object, wherein the silicone stain to be washed out is a cyclic silicone compound represented by the following formula (I):

wherein R 1 and R 2 are independently a hydrogen atom, a C 1-6 alkyl group, a C 2-6 alkenyl group, or a C 6-10 aryl group and ′n′ is an integer of not less than 4 and not more than 8, by a cleaning agent comprising a surfactin salt represented by the following formula (II):

wherein ′X′ is a residue of an amino acid selected from leucine, isoleucine, and valine, R 3 is a C 9-18 alkyl group, and ′M + ′ is an alkali metal ion or a quaternary ammonium ion.

2. The method according to claim 1 , wherein the object adhered by the silicone stain on the surface is a glass or an exterior wall.

3. The method according to claim 2 , wherein the exterior wall is a marble board, a concrete board, a brick, a roofing tile, a ceramic tile, a metal board, a flame-retardant plyboard, a ceramic siding board or an enamel panel.

4. The method according to claim 1 , further comprising the step of removing the cleaning agent for washing out a silicone stain after the washing step.

5. The method according to claim 1 , comprising the step of scrubbing the surface of the object in the washing step.

6. A method for replacing a silicone sealant, comprising the steps of
physically removing the silicone sealant,
washing the silicone sealant-removed part by the method according to claim 1 , and
applying a new sealant on the washed silicone sealant-removed part.

7. The method according to claim 1 , wherein the surfactin salt is dissolved in an aqueous solvent, and the concentration thereof in the cleaning agent is not less than 0.003% by mass.

8. The method according to claim 7 , wherein the aqueous solvent is water, a water-miscible organic solvent, or a mixed solvent of water and a water-miscible organic solvent.

9. The method according to claim 8 , wherein the water-miscible organic solvent is an alcohol solvent, an ether solvent, or a ketone solvent.

10. The method according to claim 1 , wherein the surfactin salt is dissolved in an aqueous solvent, and the concentration thereof is not more than 10% by mass.

11. The method according to claim 10 , wherein the aqueous solvent is water, a water-miscible organic solvent, or a mixed solvent of water and a water-miscible organic solvent.

12. The method according to claim 11 , wherein the water-miscible organic solvent is an alcohol solvent, an ether solvent, or a ketone solvent.

13. The method according to claim 1 , wherein R 1 and R 2 are methyl groups.

14. The method according to claim 1 , wherein at least one of ′M + ′ is a sodium ion.

15. The method according to claim 1 , wherein ‘n’ is an integer of not less than 4 and not more than 6.

16. The method according to claim 1 , wherein a concentration of the surfactin salt in the cleaning agent is no more than 5% by mass.

Assignees

• Kaneka Corp
• Aist

Inventors

• Noda Koji
• Izumida Masashi
• Yanagisawa Satohiro
• Nakashima Tohru
• Nagano Takuto
• Taira Toshiaki
• Imura Tomohiro
• Kitamoto Dai

Classifications

• B08B3/10

  with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration · CPC title

• B05D3/002

  Pretreatement · CPC title

• C07K7/56

  the cyclisation not occurring through 2,4-diamino-butanoic acid · CPC title

• C11D1/10 Primary

  Amino carboxylic acids; Imino carboxylic acids; Fatty acid condensates thereof · CPC title