Method for coating surfaces and suitable particles therefor

Abstract

A process for coating a surface comprises said surface being coated with particles (A) comprising a core (a) and at least one envelope (b) other than said core (a), and optionally with at least one hydrophobicizing agent (B) and thereafter thermally treated.

1 - 27 . (canceled) 
     
     
         28 . Particles (A′) for coating surfaces, said particles having a number average diameter in the range of from 20 to 1000 nm and comprising:
 (a) a core comprising a crosslinked copolymer of at least one vinylaromatic compound, and 
 (b) an envelope comprising a crosslinked or crosslinking-capable copolymer of at least one ethylenically unsaturated carboxylic acid or at least one ester or amide of an ethylenically unsaturated carboxylic acid, said core (a) of said particles (A′) having an average diameter in the range from 10 to 950 nm and said core (a) and said envelope (b) being mutually different. 
 
     
     
         29 . The particles according to  claim 28  wherein said envelope (b) of particles (A′) comprises a cationic copolymer. 
     
     
         30 . The particles according to  claim 29  wherein particles (A′) comprise a core-shell polymer, said shell corresponding to said envelope (b). 
     
     
         31 . A process for coating a surface with particles (A′) having a number average diameter in the range from 20 to 1000 nm and comprising:
 (a) a core comprising a crosslinked copolymer of at least one vinylaromatic compound, and 
 (b) an envelope comprising a crosslinked or crosslinking-capable copolymer of at least one ethylenically unsaturated carboxylic acid or at least one ester or amide of an ethylenically unsaturated carboxylic acid, said core (a) of said particles (A′) having an average diameter in the range from 10 to 950 nm and said core (a) and said envelope (b) being mutually different. 
 
     
     
         32 . An aqueous formulation comprising particles (A) comprising a core (a) and at least one envelope (b) other than said core (a), and optionally at least one hydrophobicizing agent (B). 
     
     
         33 . The aqueous formulation according to  claim 32  wherein said at least one hydrophobicizing agent is selected from halous polymers (B1), paraffins (B2) and compounds having at least one C 10 -C 60 -alkyl group per molecule (B3). 
     
     
         34 . The aqueous formulation according to  claim 32  wherein said core (a) comprises a crosslinked copolymer of at least one ethylenically unsaturated compound. 
     
     
         35 . The aqueous formulation according to  claim 32  wherein said particles (A) comprise an envelope (b) comprising a crosslinked or crosslinking-capable copolymer of at least one ethylenically unsaturated carboxylic acid or at least one ester or amide of an ethylenically unsaturated carboxylic acid. 
     
     
         36 . The aqueous formulation according to  claim 32  wherein said core (a) or said envelope (b) comprise a cationic copolymer. 
     
     
         37 . An aqueous formulation comprising particles (A′) having a number average diameter in the range from 20 to 1000 nm and comprising:
 (a) a core comprising a crosslinked copolymer of at least one vinylaromatic compound, and 
 (b) an envelope comprising a crosslinked or crosslinking-capable copolymer of at least one ethylenically unsaturated carboxylic acid or at least one ester or amide of an ethylenically unsaturated carboxylic acid, said core (a) of said particles (A′) having an average diameter in the range from 10 to 950 nm and said core (a) and said envelope (b) being mutually different, 
 and also at least one hydrophobicizing agent (B). 
 
     
     
         38 . A process for producing an aqueous formulation according to  claim 32  by mixing said particles (A) with water and optionally said hydrophobicizing agent (B).