Patent ES-8603919-A1 (ES)
Title: Compositions for producing on a substrate a temporary protective coating subsequently removable with aqueous alkali.
IPC: C09D5/00
Filed: 1985-05-28
Abstract: An aqueous composition suitable for the production upon a substrate of a temporary protective coating which can subsequently be removed by treatment with an aqueous alkaline solution, the composition comprising a sterically stabilised dispersion in an aqueous medium of particles of a size in the range 0.1 to 10 microns of a polymer derived from a monomer mixture comprising at least one acrylic monomer, which is the alkyl ester of acrylic acid or methacrylic acid, nitriles and amides of acrylic acid and methacrylic acid, and from 5% to 40%, based on the total weight of the monomer mixture, of an ethylenically unsaturated monocarboxylic acid, or a proportion equivalent thereto, in terms of carboxyl group content, of an ethylenically unsaturated polycarboxylic acid. - (13pp) EPAB- EP-115694 B An aqueous composition suitable for the production upon a substrate of a temporary protective coating which can subsequently be removed by treatment with an aqueous alkaline solution, the composition comprising a sterically stabilised dispersion in an aqueous medium of particles of a size in the range 0.1 to 10 microns of a polymer derived from a monomer mixture comprising at least one acrylic monomer, which is the alkyl ester of acrylic acid or methacrylic acid, nitriles and amides of acrylic acid and methacrylic acid, and from 5% to 40%, based on the total weight of the monomer mixture, of an ethylenically unsaturated monocarboxylic acid, or a proportion equivalent thereto, in terms of carboxyl group content, of an ethylenically unsaturated polycarboxylic acid. GBAB- GB2136821 B An aqueous composition suitable for the production upon a substrate of a temporary protective coating which can subsequently be removed by treatment with an aqueous alkaline solution, the composition comprising a sterically stabilised dispersion in  an aqueous medium of particles of a size in the range 0.1 to 10 microns of a polymer derived from a monomer mixture comprising at least one acrylic monomer and from 5% to 40%, based on the total weight of the monomer mixture, of an ethylenically unsaturated monocarboxylic acid, or a proportion equivalent thereto, in terms of carboxyl group content, of an ethylenically unsaturated polycarboxylic acid. A composition as claimed in claim 1, which contains from 5% to 25% by weight of an ethylenically unsaturated monocarboxylic acid, or a corresponding proportion of an unsaturated polycarboxylic acid. A composition as claimed in claim 2, which contains from 10% to 20% by weight of an ethynically unsaturated monocarboxylic acid, or a corresponding proportion of an unsaturated polycarboxylic acid. A composition as claimed in any one of claims 1 to 3 which is obtained by free radical-initiated polymerisation of the monomer mixture in an aqueous medium which is a mixture comprising (a) at least 30% by weight of water and (b) not more than 70% by weight of a second constituent which is miscible with water, the nature and proportion of the second constituent being such that the aqueous medium  as a whole is capable of dissolving the monomer mixture to the extent of at least 3% by weight but is a non-solvent for the polymer formed, the polymerisation being carried out at a temperature which is at least 10 deg.C higher than the Tg (glass-rubber transition temperature) of the polymer, in the presence in the queous medium as steric stabiliser of a block or graft. - GB2136821 B An aqueous composition suitable for the production upon a substrate of a temporary protective coating which can subsequently be removed by treatment with an aqueous alkaline solution, the composition comprising a sterically stabilised dispersion in an aqueous medium of particles of a size in the range 0.1 to 10 microns of a polymer derived from a monomer mixture comprising at least one acrylic monomer and from 5% to 40%, based on the total weight of the monomer mixture, of an ethylenically unsaturated monocarboxylic acid, or a proportion equivalent thereto, in terms of carboxyl group content, of an ethylenically unsaturated polycarboxylic acid. A composition as claimed in claim 1, which contains from 5% to 25% by weight of an ethylenically unsaturated monocarboxylic acid, or a corresponding proportion of an unsaturated polycarboxylic acid. A composition as claimed in claim 2, which contains from 10% to 20% by weight of an ethynically unsaturated monocarboxylic acid, or a corresponding proportion of an unsaturated polycarboxylic acid. A composition as claimed in any one of claims 1 to 3 which is obtained by free radical-initiated polymerisation of the monomer mixture in an aqueous medium which is a mixture comprising (a) at least 30% by weight of water and (b) not more than 70% by weight of a second constituent which is miscible with water, the nature and proportion of the second constituent being such that the aqueous medium as a whole is capable of dissolving the monomer mixture to the extent of at least 3% by weight but is a non-solvent for the polymer formed, the polymerisation being carried out at a temperature which is at least 10 deg.C higher than the Tg (glass-rubber transition temperature) of the polymer, in the presence in the queous medium as steric stabiliser of a block or graft. USAB- US4562226 A An aq. compsn. comprises sterically stabilised dispersion in an aq medium (I) of 25 wt.% of 0.1-10 microns particles of a polymer (II), and 0.5-20, pref. 2-10 wt.% wrt polymer of stabiliser precursor (III). - Temp. of polymerisation of the compsn is at least 20, pref 30 deg.C higher than the glass transition temp of the formed polymer. - (I) contains at least 30 wt.% water and upto 70 wt.% ethanol; (II) is derived from (1) at least one acrylic monomer e.g. alkyl esters, nitriles and amides of (meth)acrylic acid, and (2) 5-40 wt.% pref. 5-25, esp. 10-20 wt.% of ethylenically unsatd. polycarboxylic acid, pref. maleic or itaconic acids; (III) is the (meth)acrylic ester of polyethylene glycols, or a monoalkyl ether thereof, of mol wt 1500-4000. - Wherein resulting compsn. has pH 6-7.