Soluble acrylate copolymer containing carboxyl groups, processes

Details Soluble acrylate copolymer containing carboxyl groups, processes Soluble acrylate copolymer containing carboxyl groups, processes

1987-05-29

1989-06-13

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526265, 526271, 526273, 526312, 526318, C08F 2240, C08F 3402

Patent

active

048394483

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a soluble acrylate copolymer which can be obtained by copolymerization of monomers with at least two polymerizable, olefinically unsaturated double bonds, monomers which carry functional groups and other polymerizable monomers with an olefinically unsaturated double bond, the acrylate copolymer containing carboxyl groups.
An acrylate copolymer which has been obtained by copolymerization of 10 to 95% by weight of t-butyl acrylate, 0.1 to 3% by weight of polyfunctional monomers, such as, for example, trimethylolpropane triacrylate, 1 to 30% by weight of comonomers with functional crosslinkable groups and 0 to 80% by weight of other polymerizable, ethylenically unsaturated monomers is known from the genus-determining European Patent A-103,199. Monomers containing carboxyl groups, such as acrylic acid and methacrylic acid, are mentioned, inter alia, as comonomers with a functional crosslinkable group.
A coating composition which contains an acrylate copolymer containing carboxyl groups and branched by copolymerization of monomers with several ethylenically unsaturated bonds and a polyepoxide as a crosslinking agent is furthermore known from European Patent A-103,199. The branched acrylate copolymers described lead to coatings with a high resistance to weathering, in particular a good resistance to humidity, which is to be attributed to the content of copolymerized t-butyl acrylate on the one hand and to the content of copolymerized monomers with several olefinically unsaturated bonds.
A reactive hardenable binder mixture on the basis of particular polycarboxylic acid units based on polymerization and/or condensation products, carboxyl groups being formed, for example, by addition of cyclic carboxylic acid anhydrides onto OH-acrylates, and on the basis of aliphatic or cycloaliphatic epoxide compounds is known from European Patent B-51,275. The advantage of the hardenable binder mixture is that, in addition to the binder, a catalyst for the carboxyl-epoxy crosslinking is present in the form of metal salts, so that an external catalyst can be dispensed with.
A composition which hardness even at room temperature and consists of polyepoxides and polymers which contain carboxyl groups and tertiary amino groups and are formed by reaction of vinyl polymers containing acid anhydride groups and carboxyl groups with compounds which contain at least one active hydrogen capable of reaction with acid anhydrides and at least one tertiary amino group, such as, for example, tertiary aminoalcohols, is known from European Patent A-123,793. The compositions described have the advantage that they harden even at room temperature and have a high stability towards gasoline, water and alkalis, and that no undesirable discoloration attributable to tertiary amino compounds arise.
Japanese Preliminary Published Specification No. 53,145/79 describes compositions based on copolymers with tertiary amino groups, carboxyl groups and phosphoric acid groups and on aliphatic polyepoxides. The compositions harden at relatively low temperatures and lead to films with a good stability towards solvents and resistance to weathering.
Compositions of acrylate resins and di- and polyepoxides are known from German Offenlegungsschrift 2,635,177. .alpha.,.beta.-Ethylenically unsaturated carboxylic acids are copolymerized into the acrylate resins, and the resins have an acid number of 70 to 250. The compositions have a high solids content and show good results in respect to mechanical properties, stability towards chemicals and solvents and corrosion resistance.
A coating composition which is obtainable by mixing acrylate copolymers of acrylic acid esters, monomers containing carboxyl groups and acrylic monomers containing tertiary nitrogen, such as, for example, diethylaminoethyl acrylate, with polyepoxides is known from Japanese Preliminary Published Specification No. 76,338/77. The coating compositions can harden at low temperatures and have a high solids content.
A process for the production of a coating in which an acrylate cop

REFERENCES:
patent: 4274933 (1981-06-01), Kamada et al.

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