Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-08-07
1998-06-09
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08F27900
Patent
active
057635463
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a copolymer (C) preparable by solution polymerization and containing crosslinkable groups--with the exception of hydroxyl, carboxyl and amino groups--which copolymer is based on vinyl esters, vinyl aromatics, ethylenically unsaturated monomers containing at least one functional group and, if desired, further copolymerizable monomers.
The present invention also relates to processes for the preparation of these soluble crosslinkable copolymers and to their use.
U.S. Pat. No. 4,408,018 describes acrylate copolymers having acetoacetate groups, which copolymers can be crosslinked with .alpha.,.beta.-olefinically unsaturated esters via Michael addition in the presence of strong bases. EP-B-0,160,824 describes systems having the same cross-linking principle; however, the bases used are different and have the advantage that the paint in this case has less tendency to yellow. The components to be used as Michael acceptors are obtained via known reactions (esterification and transesterification) of hydroxyl-containing acrylates having components carrying an .alpha.,.beta.-olefinically unsaturated group in addition to a group capable of esterification or transesterification. Similar systems are described in EP-B-0,161,697. Here the reaction of malonic esters with .alpha.,.beta.-unsaturated carbonyl compounds is used for the crosslinking.
EP-A-0,310,011 describes a system based on the same crosslinking principle, in which esters of methanetricarboxylic acid are used as the acidic CH component. An addition product of a glycidyl-containing acrylate copolymer with acrylic acid is used as the Michael acceptor. The systems of EP-A-0,224,158 are also based on the Michael reaction. Here methanetricarboxamides, which can be obtained by the addition reaction of isocyanate with malonic ester, function as Michael donors.
EP-A-0,203,296 also describes polymers having free acrylic groups and being crosslinkable via the Michael addition of polymers containing block amino groups.
German Offenlegungsschrift 3,710,431 describes pre-crosslinked non-gelled acrylate copolymers containing double bonds and having free acryloyl groups. These can be crosslinked via the addition reaction of compounds containing at least two active hydrogen atoms in the molecule. For example, the compounds used have at least one group containing active hydrogen atoms or at least one active hydrogen atom and a group containing active hydrogen atoms. German Patent Application 3,832,958, which is not a prior art document, also describes systems of this type, in which compounds containing primary amino groups are used as the compounds containing active hydrogen atoms. To ensure a sufficiently long pot life, the primary amino groups have been blocked by condensation with aldehydes or ketones and are only set free during the application in situ with contact with humidity. U.S. Pat. No. 3,668,183 also describes a system which comprises a polyacetoacetate or polyacetamide component and is crosslinked with (ketimine or aldimine formation) blocked amine components to give enamines. An improvement of this system with respect to water, acid and weathering resistance is described in EP-B-0,199,087. All abovementioned systems are based on copolymers containing vinyl aromatics and, in some cases, maleic anhydride or itaconic anhydride in addition to esters of acrylic acid.
Other crosslinking systems which are suitable for curing at low temperatures and abstain from using isocyanates are mentioned in EP-A-0,316,874. Here systems are described in which crosslinking can be achieved via the addition reaction of a hydroxyl-containing polymer with a cyclic carboxylic anhydride. In a second reaction, the monoester of the anhydride thus formed reacts with epoxy groups in order to ensure optimum crosslinking. EP-A-0,316,873 describes similar systems in which, apart from the components containing hydroxyl, epoxy and anhydride groups, carboxyl-containing components which are capable of reacting in a further reaction with the epoxide present are present
REFERENCES:
patent: 3492369 (1970-01-01), Naylor
patent: 3546323 (1970-12-01), Hwa et al.
patent: 3669942 (1972-06-01), Van Westrenen et al.
patent: 4512775 (1985-04-01), Chen
patent: 4756843 (1988-07-01), Jarrin et al.
Hoffmann Peter
Jung Werner-Alfons
BASF Lacke+Farben AG
Wu David W.
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