Patent EP-1382634-A3 (EP)
Inventor: LOEHDEN GERD DR
IPC: C08F265/06
Filed: 2003-06-03
Abstract: A binder for plastisol formulations comprises at least two (meth)acrylate copolymers, one containing comonomer units with epoxide groups, the other containing comonomer units with groups which can undergo nucleophilic reaction with the epoxide groups, e.g. N-vinylimidazole units.  Plastisol formulations (PF) containing (a) plasticiser(s) and (b) a mixture of polymer particles comprising at least two components (A) and (B) in the form of (ba) a 2-, 3- or multi-shell structure or (bb) a gradient polymer structure and (c) conventional additives such as fillers, coupling agents, stabilisers, drying agents, rheological additives and hollow particles. Component (A) comprises an emulsion polymer with (KA) a core derived from (KAa) 10-50 wt.% methyl or ethyl (meth)acrylate, (KAb) 50-90 wt.% other (meth)acrylate ester(s), i.e. propyl, isopropyl, n-, iso- or tert-butyl, pentyl, hexyl, octyl, iso-octyl, cyclohexyl, 2-ethylhexyl, octadecyl, tetradecyl, oleyl, decyl, benzyl, ceryl, isobornyl, neopentyl, cyclopentyl, undecyl or dodecyl (meth)acrylate, (KAc) 0-10 wt.% other comonomers, e.g. styrene, 1-alkenes (hexene-1, heptene-1, vinylcyclohexane, 3,3-dimethylpropene, 3-methyldi-isobutene, 4-methyl-pentane-1 etc.), vinyl esters (e.g. acetate) and substituted styrenes (alpha-methylstyrene, alpha-ethylstyrene, vinyltoluene, p-methylstyrene, monochloro-, dichloro-, tribromo- or tetrabromo-styrene etc.) and (KAd) 0.1-9.9 wt.% monomers with epoxide groups, e.g. glycidyl (meth)acrylate, an outer shell (S1A) derived from (S1Aa) 70-100 wt.% monomer(s) as in (KAa), (S1Ab) 0-30 wt.% monomer(s) as in (KAb), (S1Ac) 0-10 wt.% comonomers such as styrene, styrene derivatives, vinyl acetate and others as in (KAc), preferably free from epoxide-containing monomers, a second shell (S2A) derived from (S2Aa) 20-80 wt.% monomer(s) as in (KAa), (S2Ab) 20-70 wt.% monomer(s) as in (KAb) and (S2Ac) 0.1-9.9 wt.% epoxide monomer(s), e.g. glycidyl (meth)acrylate, and a third shell (S3A) derived from (S3Aa) 30-90 wt.% monomer(s) as in (KAa), (S3Ab) 10-70 wt.% monomer(s) as in (KAb) and (S3Ac) 30-90 wt.% monomer(s) as in (KAa), (S3Ab) 10-70 wt.% monomer(s) as in (KAb) and (S3Ac) 0-10 wt.% comonomers as in (KAc). Component (B) has a core (KB) derived from (KBa) 10-50 wt.% monomer(s) as in (KAa), (KBb) 50-90 wt.% monomer(s) as in (KAb), (KBc) 0-10 wt.% monomer(s) as in (KAc) and (KBd) 0.1-9.9 wt.% monomer(s) with nucleophilic groups, an outer shell (S1B) derived from (S1Ba) 70-100 wt.% monomer(s) as in (KAa), (S1Bb) 0-30 wt.% monomer(s) as in (KAb), (S1Bc) 0-10 wt.% monomer(s) as in (KAc) and (S1Bd) 0.1-9.9 wt.% monomer(s) with nucleophilic groups, a second shell (S2B) derived from (S2Ba) 20-80 wt.% monomer(s) as in (KAa), (S2Bb) 20-70 wt.% monomer(s) as in (KAb) and (S2Bc) 0.1-9.9 wt.% monomer(s) which are capable of nucleophilic reaction with the epoxide-containing monomers in (A), e.g. N-vinylimidazole, and a third shell (S3B) derived from (S3Ba) 30-90 wt.% monomer(s) as in (KAa), (S3Bb) 10-70 wt.% monomer(s) as in (KAb), (S3Bc) 0-10 wt.% monomer(s) as in (KAc) and (S3Bd) 0.1-9.9 wt.% monomer(s) with nucleophilic groups. Independent claims are also included for  (1) (1) binders for PF, comprising components (A) and (B) in a wt. ratio of (100:0)-(20:80) (2) (2) sheet metal coated with PF and vehicles partly coated with PF .