Polymeric products useful as oil repellents
View Patent ↗Polymeric products are disclosed that are suitable for application to fibrous substrates such as textiles, leather and paper, to impart oil (oleophobicity) and water repellent (hydrophobicity) properties to the treated material. The polymeric products comprise an amino-functional polysiloxane bonded through its amino groups to an addition copolymer of a fluoro-substituted alkyl ester of an olefinically unsaturated carboxylic acid and an olefinically unsaturated monomer having a functional group capable of reacting with the amino groups of polysiloxane and optionally one or more olefinically unsaturated comonomers.
1. A polymeric product having oil repellent properties comprising an amino-functional polysiloxane (A) bonded through its amino groups to an addition copolymer (B) of (B1) a fluoro-substituted alkyl ester of an olefinically unsaturated carboxylic acid and (B2) an olefinically unsaturated monomer having a functional group capable of reacting with the amino groups of polysiloxane (A) and optionally (B3) one or more olefinically unsaturated comonomers, wherein the functional group in monomer (B2) capable of reacting with the amino groups of polysiloxane (A) is an anhydride, lactone, imide, carboxylic acid group, isocyanate or blocked isocyante.
2. The polymeric product according to claim 1 wherein the amino-functional polysiloxane (A) is a polydiorganosiloxane containing aminoalkyl groups of the formula R-(NH-A′) q -NH-A- attached to silicon, wherein A and A′ are each independently a linear or branched alkylene group having 1 to 6 carbon atoms;
q =0-4; and R is hydrogen or an alkyl or hydroxyalkyl group having 1 to 4 carbon atoms.
3. The polymeric product according to claim 1 wherein the fluoro-substituted alkyl ester monomer B1 is an acrylate or methacrylate ester of the formula
CH 2 ═C(R″)COO-D-Rf or CH2=C(R″)COO—Rf
where Rf is a branched or linear fluoroalkyl group having 3 to 21 carbon atoms, R″ is H or methyl, and D is a divalent organic group.
4. The polymeric product according to claim 1 wherein the copolymer (B) contains a comonomer (B3) which is an alkyl acrylate or methacrylate having 1 to 30 carbon atoms in the alkyl group.